java HttpServer构建http服务器

package com.tdt.server.httpserver;import java.io.IOException;import java.net.InetSocketAddress;import com.sun.net.httpserver.HttpServer;import com.sun.net.httpserver.spi.HttpServerProvider;/** *  * @author chuer * @Description: 服务器启动类 * @date 2014年11月12日 下午3:53:38  * @version V1.0 */public class MyHttpServer {    //启动服务，监听来自客户端的请求public static void start() throws IOException {Context.load();HttpServerProvider provider = HttpServerProvider.provider();HttpServer httpserver =provider.createHttpServer(new InetSocketAddress(8080), 100);//监听端口8080,能同时接 受100个请求httpserver.createContext(Context.contextPath, new MyHttpHandler()); httpserver.setExecutor(null);httpserver.start();System.out.println("server started");}public static void main(String[] args) throws IOException {start();}}

package com.tdt.server.httpserver;import java.io.IOException;import com.sun.net.httpserver.HttpExchange;import com.sun.net.httpserver.HttpHandler;import com.tdt.server.httpserver.core.Handler;import com.tdt.server.httpserver.core.impl.HttpRequest;import com.tdt.server.httpserver.core.impl.HttpResponse;/** * @author chuer * @Description: 内部消息处理类 * @date 2014年11月12日 下午3:53:44  * @version V1.0 */public class MyHttpHandler implements HttpHandler {public void handle(HttpExchange httpExchange) throws IOException {HttpRequest request = new HttpRequest(httpExchange);HttpResponse response = new HttpResponse(httpExchange);Handler handler = Context.getHandler(request.getReuestURI().getPath());handler.service(request, response);}}

package com.tdt.server.httpserver;import java.util.HashMap;import java.util.Map;import org.w3c.dom.Document;import org.w3c.dom.Element;import com.tdt.server.httpserver.core.impl.HttpHandler;import com.tdt.server.httpserver.utils.XmlUtils;/** *  * @author chuer * @Description: 上下文  * @date 2014年11月12日 下午3:53:48  * @version V1.0 */public class Context {private static Map<String,HttpHandler> contextMap = new HashMap<String,HttpHandler>();public static String contextPath = "";public static void load(){try{Document doc = XmlUtils.load(Context.class.getResource("/").getPath()+"context.xml");Element root = doc.getDocumentElement();contextPath = XmlUtils.getAttribute(root,"context");Element[] handlers = XmlUtils.getChildrenByName(root, "handler");for(Element ele : handlers){String handle_class = XmlUtils.getChildText(ele, "handler-class");String url_pattern = XmlUtils.getChildText(ele, "url-pattern");Class<?> cls = Class.forName(handle_class);Object newInstance = cls.newInstance();if(newInstance instanceof HttpHandler){contextMap.put(contextPath+url_pattern, (HttpHandler)newInstance);}}}catch(Exception e){e.printStackTrace();}}/** *  * @param key * @return */public static HttpHandler getHandler(String key){return contextMap.get(key);}}

<?xml version="1.0" encoding="UTF-8"?><httpServer context="/myApp"><handler><handler-class>com.tdt.server.httpserver.sample.FirstHandler</handler-class><url-pattern>/firstHandler</url-pattern></handler></httpServer>

package com.tdt.server.httpserver.core;/** *  * @author chuer * @Description: 相应类接口 * @date 2014年11月12日 下午3:54:02  * @version V1.0 */public interface Response {public void write(String result);}

package com.tdt.server.httpserver.core;import java.net.URI;/** * @author chuer * @Description: 请求接口 * @date 2014年11月12日 下午3:54:58  * @version V1.0 */public interface Request {public final static String GET = "GET";public final static String POST = "POST";public String getParamter(String param);public String getMethod();public URI getReuestURI();public void initRequestHeader();public void initRequestParam();public void initRequestBody();public String getRequestBody();}

package com.tdt.server.httpserver.core;/** * @author chuer * @Description: 消息处理接口 * @date 2014年11月12日 下午3:55:10  * @version V1.0 */public interface Handler {public void service(Request request, Response response);public void doGet(Request request, Response response);public void doPost(Request request, Response response);}

package com.tdt.server.httpserver.core.impl;import com.tdt.server.httpserver.core.Handler;import com.tdt.server.httpserver.core.Request;import com.tdt.server.httpserver.core.Response;public abstract class HttpHandler implements Handler {@Overridepublic void service(Request request, Response response) {request.initRequestHeader();request.initRequestParam();if(request.getMethod().equals(Request.GET)){doGet(request,response);}else if(request.getMethod().equals(Request.POST)){request.initRequestBody();doPost(request,response);}}@Overridepublic abstract void doGet(Request request, Response response);@Overridepublic abstract void doPost(Request request, Response response);}

package com.tdt.server.httpserver.core.impl;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.URI;import java.util.HashMap;import java.util.List;import java.util.Map;import com.sun.net.httpserver.HttpExchange;import com.tdt.server.httpserver.core.Request;public class HttpRequest implements Request {private HttpExchange httpExchange;private Map<String, String> paramMap = new HashMap<String, String>();private Map<String, List<String>> headMap = new HashMap<String, List<String>>();private String requestBody = "";public HttpRequest(HttpExchange httpExchange) {this.httpExchange = httpExchange;}@Overridepublic String getParamter(String param) {return paramMap.get(param);}@Overridepublic String getMethod() {return httpExchange.getRequestMethod().trim().toUpperCase();}@Overridepublic URI getReuestURI() {return httpExchange.getRequestURI();}@Overridepublic void initRequestParam() {String query = getReuestURI().getQuery();String [] arrayStr = query.split("&");for(String str : arrayStr){paramMap.put(str.split("=")[0], str.split("=")[1]);}}@Overridepublic void initRequestHeader() {for(String s : httpExchange.getRequestHeaders().keySet()){headMap.put(s, httpExchange.getRequestHeaders().get(s));}}@Overridepublic void initRequestBody() {InputStream in = httpExchange.getRequestBody(); // 获得输入流BufferedReader reader = new BufferedReader(new InputStreamReader(in));String temp = null;try {while ((temp = reader.readLine()) != null) {requestBody += temp;}} catch (IOException e) {e.printStackTrace();}}@Overridepublic String getRequestBody() {return requestBody;}public static void main(String[] args) {String query = "aaa=aaa&bbb=bbb";String [] a = query.split("&");for(String s : a){System.out.print(s.split("=")[0]+"=");System.out.println(s.split("=")[1]);}}}

package com.tdt.server.httpserver.core.impl;import java.io.IOException;import java.io.OutputStream;import com.sun.net.httpserver.HttpExchange;import com.tdt.server.httpserver.core.Response;public class HttpResponse implements Response{private HttpExchange httpExchange;public HttpResponse(HttpExchange httpExchange){this.httpExchange = httpExchange;}@Overridepublic void write(String result) {try {httpExchange.sendResponseHeaders(200, result.length());// 设置响应头属性及响应信息的长度OutputStream out = httpExchange.getResponseBody(); // 获得输出流out.write(result.getBytes());out.flush();httpExchange.close();} catch (IOException e) {e.printStackTrace();} }}

package com.tdt.server.httpserver.sample;import com.tdt.server.httpserver.core.Request;import com.tdt.server.httpserver.core.Response;import com.tdt.server.httpserver.core.impl.HttpHandler;public class FirstHandler extends HttpHandler{@Overridepublic void doGet(Request request, Response response) {System.out.println("doGet");System.out.println(request.getParamter("aaa"));System.out.println(request.getParamter("bbb"));response.write("helloWorld.....");}@Overridepublic void doPost(Request request, Response response) {System.out.println("doPost");System.out.println(request.getRequestBody());response.write("helloWorld.....");}}

启动服务器类，浏览器输出http://localhost:8080/myApp/firstHandler?aaa=aaa&bbb=bbb

显示hello world....

 

XmlUtils类是用来解析xml文件的，没有放到这里.

 

重定向代码实例：

<pre class="java" name="code">Headers responseHeaders = httpExchange.getResponseHeaders();responseHeaders.add("location", "http://www.baidu.com");httpExchange.sendResponseHeaders(302, 0);httpExchange.close();OutputStream out = httpExchange.getResponseBody(); out.write(result.getBytes());out.flush();

 

 

工具类：

package com.tdt.server.httpserver.utils;import java.io.CharArrayReader;import java.io.File;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.HashMap;import java.util.Iterator;import java.util.LinkedList;import java.util.Map;import java.util.Properties;import java.util.regex.Matcher;import java.util.regex.Pattern;import javax.xml.parsers.DocumentBuilder;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Comment;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.InputSource;/** * <p> * Title: XmlUtils * </p> * <p> * Description: XML文件处理工具 * </p> * <p> * Copyright: Copyright (c) 2008 * </p> * <p> * Company: Ocean Blue Mobile Tech. * </p> *  * @author chur * @version 1.0 */public class XmlUtils {public static final String BR = System.getProperty("line.separator");/** * load a xml file from OS file system and interpret it into a Document no * charset limited *  * @param xmlfile *            String 文件路径名 * @return Document * @throws Exception */public static Document load(String xmlfile) throws Exception {javax.xml.parsers.DocumentBuilderFactory factory =javax.xml.parsers.DocumentBuilderFactory.newInstance();factory.setIgnoringComments(false);factory.setIgnoringElementContentWhitespace(false);factory.setValidating(false);factory.setCoalescing(false);DocumentBuilder builder = factory.newDocumentBuilder();return builder.parse(xmlfile);}/** * load a xml file from OS file system and interpret it into a Document no * charset limited *  * @param xmlfile *            String 文件路径名 * @return Document * @throws Exception */public static Document load(File xmlfile) throws Exception {javax.xml.parsers.DocumentBuilderFactory factory =javax.xml.parsers.DocumentBuilderFactory.newInstance();factory.setIgnoringComments(false);factory.setIgnoringElementContentWhitespace(false);factory.setValidating(false);factory.setCoalescing(false);DocumentBuilder builder = factory.newDocumentBuilder();return builder.parse(xmlfile);}/** * 取得文件名 *  * @param filePath *            String * @return String */public static String getFileName(String filePath) {Pattern p = Pattern.compile("[^\\" + File.separator + "]+.xml");Matcher m = p.matcher(filePath);if (m.find()) {return m.group().substring(0, m.group().length() - 4);}return "";}/** * 验证文件名是否合法 *  * @param filePath *            String * @return String */public static boolean checkValidity(String filePath) {String[] array = filePath.split(".");if (array[array.length - 1].equals("xml")) {return true;} else {return false;}}public static boolean isXml(String file) {if (file.toLowerCase().endsWith("xml")) {return true;} else {return false;}}/** * load a String without the title tag of xml into a Document *  * @param domContent *            String 没有head的XML内容 * @return Document * @throws Exception */public static Document loadStringWithoutTitle(String domContent)throws Exception {domContent = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" + BR+ domContent;return XmlUtils.loadString(domContent);}/** * load a String with a title tag of xml into a Document *  * @param domContent *            String XML内容 * @return Document * @throws Exception */public static Document loadString(String domContent) throws Exception {javax.xml.parsers.DocumentBuilderFactory factory = javax.xml.parsers.DocumentBuilderFactory.newInstance();factory.setIgnoringComments(false);factory.setIgnoringElementContentWhitespace(false);factory.setValidating(false);factory.setCoalescing(false);DocumentBuilder builder = factory.newDocumentBuilder();char[] chars = new char[domContent.length()];domContent.getChars(0, domContent.length(), chars, 0);InputSource is = new InputSource(new CharArrayReader(chars));return (builder.parse(is));}/** * 根据完整路径得到整个文档的一个子节点的文字 *  * @param doc *            Document 文档 * @param fullname *            String 子节点完整路径 * @return String */public static String getTextByFullName(Document doc, String fullname) {String path[] = StringUtils.toStringArray(fullname, ".");Element e = doc.getDocumentElement();for (int i = 1; i < path.length; i++) {e = getChildByName(e, path[i]);}return getText(e);}/** * 根据完整路径得到某个节点的一个子节点的文字 *  * @param parent *            Element 父节点 * @param fullname *            String 子节点完整路径 * @return String */public static String getTextByFullName(Element parent, String fullname) {String path[] = StringUtils.toStringArray(fullname, ".");Element e = parent;for (int i = 0; i < path.length; i++) {e = getChildByName(e, path[i]);}return getText(e);}/** * 根据一个document对象获取某节点下的property的内容 * @param parent *            Element * @param name *            String * @return String */public static String getChildText(Element parent, String name) {Element e = getChildByName(parent, name);if (e == null) {return "";}return getText(e);}/** * 根据名称得到一个父节点下所有的子节点 *  * @param e *            Element * @param name *            String * @return Element[] */public static Element[] getChildrenByName(Element e, String name) {NodeList nl = e.getChildNodes();int max = nl.getLength();LinkedList<Node> list = new LinkedList<Node>();for (int i = 0; i < max; i++) {Node n = nl.item(i);if (n.getNodeType() == Node.ELEMENT_NODE&& n.getNodeName().equals(name)) {list.add(n);}}return list.toArray(new Element[list.size()]);}/** * 根据名字查找某个节点下的符合该名字的节点 *  * @param e *            Element 父节点 * @param name *            String 子节点名称 * @return Element */public static Element getChildByName(Element e, String name) {Element[] list = getChildrenByName(e, name);if (list.length == 0) {return null;}if (list.length > 1) {throw new IllegalStateException("Too many (" + list.length + ") '"+ name + "' elements found!");}return list[0];}/** * 得到一个节点的文字 *  * @param e *            Element * @return String */public static String getText(Element e) {NodeList nl = e.getChildNodes();int max = nl.getLength();for (int i = 0; i < max; i++) {Node n = nl.item(i);if (n.getNodeType() == Node.TEXT_NODE) {return n.getNodeValue();}}return "";}public static String getAttribute(Element e, String name) {return e.getAttribute(name);}/** * get Int value *  * @param player * @param name * @return */public static int getIntValue(Element e) {return Integer.valueOf(getText(e));}/** * get byte value *  * @param player * @param name * @return */public static byte getByteValue(Element e) {return Byte.valueOf(getText(e));}/** * 获取Properties格式的xml数据 *  * @param root * @return */public static Map<String, Object> getProperties(Element root) {Map<String, Object> map = new HashMap<String, Object>();Element[] list = getChildrenByName(root, "property");for (int i = 0; i < list.length; i++) {String name = list[i].getAttribute("name");String type = list[i].getAttribute("type");String valueString = getText(list[i]);try {Class<?> cls = Class.forName(type);Constructor<?> con = cls.getConstructor(new Class<?>[] { String.class});Object value = con.newInstance(new Object[] { valueString});map.put(name, value);} catch (Exception e) {System.err.println("Unable to parse property '" + name +"'='" + valueString + "': " + e.toString());}}return map;}/** * 将dom中的内容存入xmlfile所指的文件中。 dom==null时，xml文件也是空的。 *  * @param xmlfile *            java.lang.String 保存的文件名 * @param doc *            ort.w3c.dom.Document 需要保存的DOM * @throws Exception *             任何异常 */public static void save(String xmlfile, Document doc) throws Exception {// 首先创建一个DOMSource对象,该构造函数的参数可以是一个Document对象// doc代表更改后的DOM Tree。DOMSource doms = new DOMSource(doc);// 创建一个File对象,代表DOM Tree所包含的数据的输出介质,这是一个XML文件。File f = new File(xmlfile);File dir = f.getParentFile();dir.mkdirs();// 创建一个StreamResult对象,该构造函数的参数可以取为File对象。StreamResult sr = new StreamResult(f);// 下面调用JAXP中的XSLT引擎来实现输出DOM Tree中的数据到XML文件中的功能。// XSLT引擎的输入为DOMSource对象,输出为StreamResut对象。try {// 首先创建一个TransformerFactory对象,再由此创建Transformer对象。Transformer// 类相当于一个XSLT引擎。通常我们使用它来处理XSL文件,但是在这里我们使// 用它来输出XML文档。TransformerFactory tf = TransformerFactory.newInstance();Transformer t = tf.newTransformer();// 设置新的输出属性:输出字符编码为UTF-8,XSLT引擎所输出// 的XML文档如果包含了中文字符,可以正常显示,不会出现所谓的"汉字问题"。// 请留意OutputKeys类的字符串常数OutputKeys.ENCODING。Properties properties = t.getOutputProperties();properties.setProperty(OutputKeys.ENCODING, "UTF-8");properties.setProperty(OutputKeys.INDENT, "yes");// 更新XSLT引擎的输出属性。t.setOutputProperties(properties);// 关键的一步, 调用Transformer对象 (XSLT引擎)的transform()方法,该方法的第一// 个参数是DOMSource对象,第二个参数是StreamResult对象。t.transform(doms, sr);} catch (TransformerConfigurationException tce) {tce.printStackTrace();} catch (TransformerException te) {te.printStackTrace();}}/** * create a blank Document. *  * @param rootElementName *            String * @return Document * @throws Exception */public static Document blankDocument(String rootElementName)throws Exception {javax.xml.parsers.DocumentBuilderFactory factory =javax.xml.parsers.DocumentBuilderFactory.newInstance();factory.setIgnoringComments(false);factory.setIgnoringElementContentWhitespace(false);factory.setValidating(false);factory.setCoalescing(false);DocumentBuilder builder = factory.newDocumentBuilder();Document doc = builder.newDocument();Element root = doc.createElement(rootElementName);doc.appendChild(root);return doc;}public static Element createChild(Document doc, Element root, String name) {Element elem = doc.createElement(name);root.appendChild(elem);return elem;}public static void createChildText(Document doc, Element elem, String name,String value) {Element child = doc.createElement(name);child.appendChild(doc.createTextNode(value == null ? "" : value));elem.appendChild(child);}/** * 创建一个带注释的子节点 *  * @param doc *            Document * @param elem *            Element * @param name *            String * @param value *            String * @param comment *            String */public static void createChildTextWithComment(Document doc, Element elem,String name, String value, String comment) {Element child = doc.createElement(name);child.appendChild(doc.createTextNode(value == null ? "" : value));Comment c = doc.createComment(comment);elem.appendChild(c);elem.appendChild(child);}/** * 创建一段注释 *  * @param doc *            Document * @param comment *            String */public static void createComment(Document doc, String comment) {Comment c = doc.createComment(comment);doc.getDocumentElement().appendChild(c);}public static void createOptionalChildText(Document doc, Element elem,String name, String value) {if (value == null || value.length() == 0) {return;}Element child = doc.createElement(name);child.appendChild(doc.createTextNode(value));elem.appendChild(child);}public static void applyProperties(Object o, Element root) {Map<String,Object> map = getProperties(root);Iterator<String> it = map.keySet().iterator();Field[] fields = o.getClass().getFields();Method[] methods = o.getClass().getMethods();while (it.hasNext()) {String name = (String) it.next();Object value = map.get(name);try {for (int i = 0; i < fields.length; i++) {if (fields[i].getName().equalsIgnoreCase(name) && isTypeMatch(fields[i].getType(),value.getClass())) {fields[i].set(o, value);System.err.println("Set field " + fields[i].getName() + "=" + value);break;}}for (int i = 0; i < methods.length; i++) {if (methods[i].getName().equalsIgnoreCase("set" + name) && methods[i].getParameterTypes().length == 1 && isTypeMatch(methods[i].getParameterTypes()[0], value.getClass())) {methods[i].invoke(o, new Object[] { value});System.err.println("Set method " + methods[i].getName() + "=" + value);break;}}} catch (Exception e) {System.err.println("Unable to apply property '" + name + "': " + e.toString());}}}private static boolean isTypeMatch(Class<?> one, Class<?> two) {if (one.equals(two)) {return true;}if (one.isPrimitive()) {if (one.getName().equals("int") && two.getName().equals("java.lang.Integer")) {return true;}if (one.getName().equals("long") && two.getName().equals("java.lang.Long")) {return true;}if (one.getName().equals("float") && two.getName().equals("java.lang.Float")) {return true;}if (one.getName().equals("double") && two.getName().equals("java.lang.Double")) {return true;}if (one.getName().equals("char") && two.getName().equals("java.lang.Character")) {return true;}if (one.getName().equals("byte") && two.getName().equals("java.lang.Byte")) {return true;}if (one.getName().equals("short") && two.getName().equals("java.lang.Short")) {return true;}if (one.getName().equals("boolean") && two.getName().equals("java.lang.Boolean")) {return true;}}return false;}}

 

package com.tdt.server.httpserver.utils;import java.util.LinkedList;import java.util.StringTokenizer;import java.util.regex.Matcher;import java.util.regex.Pattern;public class StringUtils {/** * Converts a line of text into an array of lower case words. Words are * delimited by the following characters: , .\r\n:/\+ * <p> * In the future, this method should be changed to use a * BreakIterator.wordInstance(). That class offers much more fexibility. *  * @param text *            a String of text to convert into an array of words * @return text broken up into an array of words. */public static final String[] toLowerCaseWordArray(String text) {if (text == null || text.length() == 0) {return new String[0];}StringTokenizer tokens = new StringTokenizer(text, " ,\r\n.:/\\+");String[] words = new String[tokens.countTokens()];for (int i = 0; i < words.length; i++) {words[i] = tokens.nextToken().toLowerCase();}return words;}/** * Converts a line of text into an array of lower case words. Words are * delimited by the following characters: , .\r\n:/\+ * <p> * In the future, this method should be changed to use a * BreakIterator.wordInstance(). That class offers much more fexibility. *  * @param text *            a String of text to convert into an array of words * @return text broken up into an array of words. */public static final String[] toStringArray(String text) {if (text == null || text.length() == 0) {return new String[0];}StringTokenizer tokens = new StringTokenizer(text, ",\r\n/\\");String[] words = new String[tokens.countTokens()];for (int i = 0; i < words.length; i++) {words[i] = tokens.nextToken();}return words;}/** * * Converts a line of text into an array of lower case words. Words are * delimited by the following characters: , .\r\n:/\+ * <p> * In the future, this method should be changed to use a * BreakIterator.wordInstance(). That class offers much more fexibility. *  * @param text *            a String of text to convert into an array of words * @param token *            String * @return String[]broken up into an array of words. */public static final String[] toStringArray(String text, String token) {if (text == null || text.length() == 0) {return new String[0];}StringTokenizer tokens = new StringTokenizer(text, token);String[] words = new String[tokens.countTokens()];for (int i = 0; i < words.length; i++) {words[i] = tokens.nextToken();}return words;}/** *  * @param source * @return */public static String[] splitOnWhitespace(String source) {int pos = -1;LinkedList<String> list = new LinkedList<String>();int max = source.length();for (int i = 0; i < max; i++) {char c = source.charAt(i);if (Character.isWhitespace(c)) {if (i - pos > 1) {list.add(source.substring(pos + 1, i));}pos = i;}}return list.toArray(new String[list.size()]);}/** * Replayer str *  * @param str * @param key * @param replacement * @return */public static final String replaceAll(String str, String key,String replacement) {if (str != null && key != null && replacement != null&& !str.equals("") && !key.equals("")) {StringBuilder strbuf = new StringBuilder();int begin = 0;int slen = str.length();int npos = 0;int klen = key.length();for (; begin < slen && (npos = str.indexOf(key, begin)) >= begin; begin = npos+ klen) {strbuf.append(str.substring(begin, npos)).append(replacement);}if (begin == 0) {return str;}if (begin < slen) {strbuf.append(str.substring(begin));}return strbuf.toString();} else {return str;}}public static String UnicodeToString(String str) {    Pattern pattern = Pattern.compile("(\\\\u(\\p{XDigit}{4}))");    Matcher matcher = pattern.matcher(str);    char ch;   boolean hasU = false;while (matcher.find()) {   hasU = true;ch = (char) Integer.parseInt(matcher.group(2), 16);     str = str.replace(matcher.group(1), ch + "");    } String s = str;try{if(!hasU){int i = 0;String rstr = "";while(i+4<=str.length()){ch = (char) Integer.parseInt(str.substring(i,i=i+4), 16); rstr = rstr+ch;}str = rstr;}}catch(Exception ex){str = s;ex.printStackTrace();}return str;   }     /** 空字符串。 */    public static final String EMPTY_STRING = "";    /**     * 比较两个字符串（大小写敏感）。     * <pre>     * StringUtil.equals(null, null)   = true     * StringUtil.equals(null, "abc")  = false     * StringUtil.equals("abc", null)  = false     * StringUtil.equals("abc", "abc") = true     * StringUtil.equals("abc", "ABC") = false     * </pre>     *     * @param str1 要比较的字符串1     * @param str2 要比较的字符串2     *     * @return 如果两个字符串相同，或者都是<code>null</code>，则返回<code>true</code>     */    public static boolean equals(String str1, String str2) {        if (str1 == null) {            return str2 == null;        }        return str1.equals(str2);    }    /**     * 比较两个字符串（大小写不敏感）。     * <pre>     * StringUtil.equalsIgnoreCase(null, null)   = true     * StringUtil.equalsIgnoreCase(null, "abc")  = false     * StringUtil.equalsIgnoreCase("abc", null)  = false     * StringUtil.equalsIgnoreCase("abc", "abc") = true     * StringUtil.equalsIgnoreCase("abc", "ABC") = true     * </pre>     *     * @param str1 要比较的字符串1     * @param str2 要比较的字符串2     *     * @return 如果两个字符串相同，或者都是<code>null</code>，则返回<code>true</code>     */    public static boolean equalsIgnoreCase(String str1, String str2) {        if (str1 == null) {            return str2 == null;        }        return str1.equalsIgnoreCase(str2);    }    /**     * 检查字符串是否是空白：<code>null</code>、空字符串<code>""</code>或只有空白字符。     * <pre>     * StringUtil.isBlank(null)      = true     * StringUtil.isBlank("")        = true     * StringUtil.isBlank(" ")       = true     * StringUtil.isBlank("bob")     = false     * StringUtil.isBlank("  bob  ") = false     * </pre>     *     * @param str 要检查的字符串     *     * @return 如果为空白, 则返回<code>true</code>     */    public static boolean isBlank(String str) {        int length;        if ((str == null) || ((length = str.length()) == 0)) {            return true;        }        for (int i = 0; i < length; i++) {            if (!Character.isWhitespace(str.charAt(i))) {                return false;            }        }        return true;    }    /**     * 检查字符串是否不是空白：<code>null</code>、空字符串<code>""</code>或只有空白字符。     * <pre>     * StringUtil.isBlank(null)      = false     * StringUtil.isBlank("")        = false     * StringUtil.isBlank(" ")       = false     * StringUtil.isBlank("bob")     = true     * StringUtil.isBlank("  bob  ") = true     * </pre>     *     * @param str 要检查的字符串     *     * @return 如果为空白, 则返回<code>true</code>     */    public static boolean isNotBlank(String str) {        int length;        if ((str == null) || ((length = str.length()) == 0)) {            return false;        }        for (int i = 0; i < length; i++) {            if (!Character.isWhitespace(str.charAt(i))) {                return true;            }        }        return false;    }    /**     * 检查字符串是否为<code>null</code>或空字符串<code>""</code>。     * <pre>     * StringUtil.isEmpty(null)      = true     * StringUtil.isEmpty("")        = true     * StringUtil.isEmpty(" ")       = false     * StringUtil.isEmpty("bob")     = false     * StringUtil.isEmpty("  bob  ") = false     * </pre>     *     * @param str 要检查的字符串     *     * @return 如果为空, 则返回<code>true</code>     */    public static boolean isEmpty(String str) {        return ((str == null) || (str.length() == 0));    }    /**     * 检查字符串是否不是<code>null</code>和空字符串<code>""</code>。     * <pre>     * StringUtil.isEmpty(null)      = false     * StringUtil.isEmpty("")        = false     * StringUtil.isEmpty(" ")       = true     * StringUtil.isEmpty("bob")     = true     * StringUtil.isEmpty("  bob  ") = true     * </pre>     *     * @param str 要检查的字符串     *     * @return 如果不为空, 则返回<code>true</code>     */    public static boolean isNotEmpty(String str) {        return ((str != null) && (str.length() > 0));    }    /**     * 在字符串中查找指定字符串，并返回第一个匹配的索引值。如果字符串为<code>null</code>或未找到，则返回<code>-1</code>。     * <pre>     * StringUtil.indexOf(null, *)          = -1     * StringUtil.indexOf(*, null)          = -1     * StringUtil.indexOf("", "")           = 0     * StringUtil.indexOf("aabaabaa", "a")  = 0     * StringUtil.indexOf("aabaabaa", "b")  = 2     * StringUtil.indexOf("aabaabaa", "ab") = 1     * StringUtil.indexOf("aabaabaa", "")   = 0     * </pre>     *     * @param str 要扫描的字符串     * @param searchStr 要查找的字符串     *     * @return 第一个匹配的索引值。如果字符串为<code>null</code>或未找到，则返回<code>-1</code>     */    public static int indexOf(String str, String searchStr) {        if ((str == null) || (searchStr == null)) {            return -1;        }        return str.indexOf(searchStr);    }    /**     * 在字符串中查找指定字符串，并返回第一个匹配的索引值。如果字符串为<code>null</code>或未找到，则返回<code>-1</code>。     * <pre>     * StringUtil.indexOf(null, *, *)          = -1     * StringUtil.indexOf(*, null, *)          = -1     * StringUtil.indexOf("", "", 0)           = 0     * StringUtil.indexOf("aabaabaa", "a", 0)  = 0     * StringUtil.indexOf("aabaabaa", "b", 0)  = 2     * StringUtil.indexOf("aabaabaa", "ab", 0) = 1     * StringUtil.indexOf("aabaabaa", "b", 3)  = 5     * StringUtil.indexOf("aabaabaa", "b", 9)  = -1     * StringUtil.indexOf("aabaabaa", "b", -1) = 2     * StringUtil.indexOf("aabaabaa", "", 2)   = 2     * StringUtil.indexOf("abc", "", 9)        = 3     * </pre>     *     * @param str 要扫描的字符串     * @param searchStr 要查找的字符串     * @param startPos 开始搜索的索引值，如果小于0，则看作0     *     * @return 第一个匹配的索引值。如果字符串为<code>null</code>或未找到，则返回<code>-1</code>     */    public static int indexOf(String str, String searchStr, int startPos) {        if ((str == null) || (searchStr == null)) {            return -1;        }        // JDK1.3及以下版本的bug：不能正确处理下面的情况        if ((searchStr.length() == 0) && (startPos >= str.length())) {            return str.length();        }        return str.indexOf(searchStr, startPos);    }    /**     * 取指定字符串的子串。     *      * <p>     * 负的索引代表从尾部开始计算。如果字符串为<code>null</code>，则返回<code>null</code>。     * <pre>     * StringUtil.substring(null, *, *)    = null     * StringUtil.substring("", * ,  *)    = "";     * StringUtil.substring("abc", 0, 2)   = "ab"     * StringUtil.substring("abc", 2, 0)   = ""     * StringUtil.substring("abc", 2, 4)   = "c"     * StringUtil.substring("abc", 4, 6)   = ""     * StringUtil.substring("abc", 2, 2)   = ""     * StringUtil.substring("abc", -2, -1) = "b"     * StringUtil.substring("abc", -4, 2)  = "ab"     * </pre>     * </p>     *     * @param str 字符串     * @param start 起始索引，如果为负数，表示从尾部计算     * @param end 结束索引（不含），如果为负数，表示从尾部计算     *     * @return 子串，如果原始串为<code>null</code>，则返回<code>null</code>     */    public static String substring(String str, int start, int end) {        if (str == null) {            return null;        }        if (end < 0) {            end = str.length() + end;        }        if (start < 0) {            start = str.length() + start;        }        if (end > str.length()) {            end = str.length();        }        if (start > end) {            return EMPTY_STRING;        }        if (start < 0) {            start = 0;        }        if (end < 0) {            end = 0;        }        return str.substring(start, end);    }    /**     * 检查字符串中是否包含指定的字符串。如果字符串为<code>null</code>，将返回<code>false</code>。     * <pre>     * StringUtil.contains(null, *)     = false     * StringUtil.contains(*, null)     = false     * StringUtil.contains("", "")      = true     * StringUtil.contains("abc", "")   = true     * StringUtil.contains("abc", "a")  = true     * StringUtil.contains("abc", "z")  = false     * </pre>     *     * @param str 要扫描的字符串     * @param searchStr 要查找的字符串     *     * @return 如果找到，则返回<code>true</code>     */    public static boolean contains(String str, String searchStr) {        if ((str == null) || (searchStr == null)) {            return false;        }        return str.indexOf(searchStr) >= 0;    }    /**     * <p>Checks if the String contains only unicode digits.     * A decimal point is not a unicode digit and returns false.</p>     *     * <p><code>null</code> will return <code>false</code>.     * An empty String ("") will return <code>true</code>.</p>     *     * <pre>     * StringUtils.isNumeric(null)   = false     * StringUtils.isNumeric("")     = true     * StringUtils.isNumeric("  ")   = false     * StringUtils.isNumeric("123")  = true     * StringUtils.isNumeric("12 3") = false     * StringUtils.isNumeric("ab2c") = false     * StringUtils.isNumeric("12-3") = false     * StringUtils.isNumeric("12.3") = false     * </pre>     *     * @param str  the String to check, may be null     * @return <code>true</code> if only contains digits, and is non-null     */    public static boolean isNumeric(String str) {        if (str == null) {            return false;        }        int sz = str.length();        for (int i = 0; i < sz; i++) {            if (Character.isDigit(str.charAt(i)) == false) {                return false;            }        }        return true;    }/** * 字符串拼接 * @param object * @return */public static String assemble(char sep,Object... object){if(object == null)return null;StringBuilder sb = new StringBuilder();for(Object obj:object){if(obj == null)obj="";sb.append(obj.toString()).append(sep);}String str = "";if(sb.length()>0){str = sb.substring(0, sb.length()-1);}return str;}// 6-16个字母和数字组成private static String regex = "^[A-Za-z0-9]$";/** * 检测字符串是否符合规则（6-16个字母和数字组成，大小写不敏感） * @param user * @return */public static boolean checkStringLegal(String user) {boolean isMatch = true;char[] userChars = user.toCharArray();for(char c : userChars){isMatch = String.valueOf(c).matches(regex);if(!isMatch){break;}}return isMatch;}public static String getString(String input) {return getString(input, true, "");}public static String getString(String input, boolean btrim, String dval) {if (input == null)return dval;try {if (btrim)return trim(input);elsereturn input;} catch (Exception e) {return "";}}public static String Trim(String str) {return trim(str);}public static String[] Trim(String[] s) {return trim(s);}public static String trim(String str) {if (str == null)return "";elsereturn str.trim();}public static String[] trim(String[] s) {if (s == null || s.length <= 0)return s;for (int i = 0; i < s.length; i++)s[i] = trim(s[i]);return s;}public static int getInt(String input, boolean btrim, int dval) {if (input == null)return dval;int val;try {String str = new String(input);if (btrim)str = trim(str);val = Integer.parseInt(str);} catch (Exception e) {val = dval;}return val;}public static int[] getInts(String input) {return getInts(input, ",");}public static int[] getInts(String input, String split) {if (input == null) {return null;}String[] ss = input.split(split);int[] ii = new int[ss.length];for (int i=0;i<ii.length;i++) {ii[i] = getInt(ss[i]);}return ii;}public static int getInt(String input) {return getInt(input, true, 0);}}