Java Web 常用工具类（持续更新）
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1、ExceptionUtil
import java.io.PrintWriter;import java.io.StringWriter;public class ExceptionUtil { /**S * 获取异常的堆栈信息 * * @param t * @return */ public static String getStackTrace(Throwable t) { StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); try { t.printStackTrace(pw); return sw.toString(); } finally { pw.close(); } }}2、FastDFSClient
import org.csource.fastdfs.ClientGlobal;import org.csource.fastdfs.StorageClient1;import org.csource.fastdfs.StorageServer;import org.csource.fastdfs.TrackerClient;import org.csource.fastdfs.TrackerServer;public class FastDFSClient { private TrackerClient trackerClient = null; private TrackerServer trackerServer = null; private StorageServer storageServer = null; //使用StorageClient1进行上传 private StorageClient1 storageClient1 = null; public FastDFSClient(String conf) throws Exception { //获取classpath路径下配置文件"fdfs_client.conf"的路径 //conf直接写相对于classpath的位置，不需要写classpath: String configPath = this.getClass().getClassLoader().getResource(conf).getFile(); System.out.println(configPath); ClientGlobal.init(configPath); trackerClient = new TrackerClient(); trackerServer = trackerClient.getConnection(); storageServer = trackerClient.getStoreStorage(trackerServer); storageClient1 = new StorageClient1(trackerServer, storageServer); } public String uploadFile(byte[] file_buff, String file_ext_name) throws Exception { String result = storageClient1.upload_file1(file_buff, file_ext_name, null); return result; } public String uploadFile(byte[] file_buff) throws Exception { String result = storageClient1.upload_file1(file_buff, null, null); return result; } public String uploadFile(String local_filename, String file_ext_name) throws Exception { String result = storageClient1.upload_file1(local_filename, file_ext_name, null); return result; }}3、HttpClientUtil
import java.io.IOException;import java.net.URI;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.utils.URIBuilder;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class HttpClientUtil { public static String doGet(String url, Map<String, String>param) { // 创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); String resultString = ""; CloseableHttpResponse response = null; try { // 创建uri URIBuilder builder = new URIBuilder(url); if (param != null) { for (String key : param.keySet()) { builder.addParameter(key, param.get(key)); } } URI uri = builder.build(); // 创建http GET请求 HttpGet httpGet = new HttpGet(uri); // 执行请求 response = httpclient.execute(httpGet); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { resultString = EntityUtils.toString(response.getEntity(), "UTF-8"); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doGet(String url) { return doGet(url, null); } public static String doPost(String url, Map<String, String>param) { // 创建Httpclient对象 CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); // 创建参数列表 if (param != null) { List<NameValuePair>paramList = new ArrayList<>(); for (String key : param.keySet()) { paramList.add(new BasicNameValuePair(key, param.get(key))); } // 模拟表单 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList); httpPost.setEntity(entity); } // 执行http请求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), "utf-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { response.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return resultString; } public static String doPost(String url) { return doPost(url, null); } public static String doPostJson(String url,String json) { //创建HttpClient对象 CloseableHttpClient httpClient = HttpClients.createDefault(); String resultString = ""; CloseableHttpResponse response = null; try { //创建post请求 HttpPost httpPost = new HttpPost(url); //创建请求内容 StringEntity entity = new StringEntity(json,ContentType.APPLICATION_JSON); httpPost.setEntity(entity); //执行http请求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(),"UTF-8"); } catch (Exception e) { e.printStackTrace(); }finally { try { response.close(); } catch (Exception e2) { e2.printStackTrace(); } } return resultString; }}4、JsonUtils
import java.util.List;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.JavaType;import com.fasterxml.jackson.databind.ObjectMapper;public class JsonUtils { // 定义jackson对象 private static final ObjectMapper MAPPER = new ObjectMapper(); /** * 将对象转换成json字符串。 */ public static String objectToJson(Object data) { try { String string = MAPPER.writeValueAsString(data); return string; } catch (JsonProcessingException e) { e.printStackTrace(); } return null; } /** * 将json结果集转化为对象 */ public static <T> T jsonToPojo(String jsonData, Class<T> beanType) { try { T t = MAPPER.readValue(jsonData, beanType); return t; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 将json数据转换成pojo对象list */ public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) { JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType); try { List<T> list = MAPPER.readValue(jsonData, javaType); return list; } catch (Exception e) { e.printStackTrace(); } return null; }}5、CookieUtils
import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.net.URLEncoder;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * * Cookie 工具类 * */public final class CookieUtils { /** * 得到Cookie的值, 不编码 * * @param request * @param cookieName * @return */ public static String getCookieValue(HttpServletRequest request, String cookieName) { return getCookieValue(request, cookieName, false); } /** * 得到Cookie的值, * * @param request * @param cookieName * @return */ public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) { Cookie[] cookieList = request.getCookies(); if (cookieList == null || cookieName == null) { return null; } String retValue = null; try { for (int i = 0; i < cookieList.length; i++) { if (cookieList[i].getName().equals(cookieName)) { if (isDecoder) { retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8"); } else { retValue = cookieList[i].getValue(); } break; } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return retValue; } /** * 得到Cookie的值, * * @param request * @param cookieName * @return */ public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) { Cookie[] cookieList = request.getCookies(); if (cookieList == null || cookieName == null) { return null; } String retValue = null; try { for (int i = 0; i < cookieList.length; i++) { if (cookieList[i].getName().equals(cookieName)) { retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString); break; } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return retValue; } /** * 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码 */ public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue) { setCookie(request, response, cookieName, cookieValue, -1); } /** * 设置Cookie的值 在指定时间内生效,但不编码 */ public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage) { setCookie(request, response, cookieName, cookieValue, cookieMaxage, false); } /** * 设置Cookie的值 不设置生效时间,但编码 */ public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, boolean isEncode) { setCookie(request, response, cookieName, cookieValue, -1, isEncode); } /** * 设置Cookie的值 在指定时间内生效, 编码参数 */ public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) { doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode); } /** * 设置Cookie的值 在指定时间内生效, 编码参数(指定编码) */ public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, String encodeString) { doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString); } /** * 删除Cookie带cookie域名 */ public static void deleteCookie(HttpServletRequest request, HttpServletResponse response, String cookieName) { doSetCookie(request, response, cookieName, "", -1, false); } /** * 设置Cookie的值，并使其在指定时间内生效 * * @param cookieMaxage cookie生效的最大秒数 */ private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) { try { if (cookieValue == null) { cookieValue = ""; } else if (isEncode) { cookieValue = URLEncoder.encode(cookieValue, "utf-8"); } Cookie cookie = new Cookie(cookieName, cookieValue); if (cookieMaxage > 0) cookie.setMaxAge(cookieMaxage); if (null != request) {// 设置域名的cookie String domainName = getDomainName(request); System.out.println(domainName); if (!"localhost".equals(domainName)) { cookie.setDomain(domainName); } } cookie.setPath("/"); response.addCookie(cookie); } catch (Exception e) { e.printStackTrace(); } } /** * 设置Cookie的值，并使其在指定时间内生效 * * @param cookieMaxage cookie生效的最大秒数 */ private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, String encodeString) { try { if (cookieValue == null) { cookieValue = ""; } else { cookieValue = URLEncoder.encode(cookieValue, encodeString); } Cookie cookie = new Cookie(cookieName, cookieValue); if (cookieMaxage > 0) cookie.setMaxAge(cookieMaxage); if (null != request) {// 设置域名的cookie String domainName = getDomainName(request); System.out.println(domainName); if (!"localhost".equals(domainName)) { cookie.setDomain(domainName); } } cookie.setPath("/"); response.addCookie(cookie); } catch (Exception e) { e.printStackTrace(); } } /** * 得到cookie的域名 */ private static final String getDomainName(HttpServletRequest request) { String domainName = null; String serverName = request.getRequestURL().toString(); if (serverName == null || serverName.equals("")) { domainName = ""; } else { serverName = serverName.toLowerCase(); serverName = serverName.substring(7); final int end = serverName.indexOf("/"); serverName = serverName.substring(0, end); final String[] domains = serverName.split("\\."); int len = domains.length; if (len > 3) { // www.xxx.com.cn domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1]; } else if (len <= 3 && len > 1) { // xxx.com or xxx.cn domainName = "." + domains[len - 2] + "." + domains[len - 1]; } else { domainName = serverName; } } if (domainName != null && domainName.indexOf(":") > 0) { String[] ary = domainName.split("\\:"); domainName = ary[0]; } return domainName; }}6、CommonUtil
import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.apache.commons.lang3.StringUtils;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import com.github.pagehelper.StringUtil;public class CommonUtil{ //private static final String EN_NAME = "en_name"; //private static final String ZH_NAME = "zh_name"; //private static final String ZB_NAME = "zb_name"; /** * 获取HttpServletRequest; * * @return [参数说明] * * @return HttpServletRequest [返回类型说明] * @exception throws * [违例类型] [违例说明] * @see [类、类#方法、类#成员] */ public static HttpServletRequest getHttpRequest() { return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); } /** * 获取文件扩展名; * * @param fileName * @return [参数说明] * * @return String [返回类型说明] * @exception throws * [违例类型] [违例说明] * @see [类、类#方法、类#成员] */ public static String getFileExtension(String fileName) { if (StringUtil.isEmpty(fileName)) { return null; } return fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()); } /** * 获取文件扩展名; * * @param fileName * @return [参数说明] * * @return String [返回类型说明] * @exception throws * [违例类型] [违例说明] * @see [类、类#方法、类#成员] */ public static String getFileName(String fileName) { String fileExtension = getFileExtension(fileName); return fileName.substring(0, fileName.lastIndexOf(fileExtension) - 1); } /** * 用来去掉List中空值和相同项的。 * * @param list * @return */ public static List<String> removeSameItem(List<String> list) { List<String> difList = new ArrayList<String>(); for (String t : list) { if (t != null && !difList.contains(t)) { difList.add(t); } } return difList; } /** * 返回用户的IP地址 * * @param request * @return */ public static String toIpAddr(HttpServletRequest request) { String ip = request.getHeader("X-Forwarded-For"); if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("WL-Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("HTTP_CLIENT_IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("HTTP_X_FORWARDED_FOR"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); } return ip; } /** * 去除字符串最后一个逗号,若传入为空则返回空字符串 * * @descript * @param para * @return * @author zoomy * @date 2015年3月29日 * @version 1.0 */ public static String trimComma(String para) { if (StringUtils.isNotBlank(para)) { if (para.endsWith(",")) { return para.substring(0, para.length() - 1); } else { return para; } } else { return ""; } } public static Integer valueOf(String value, int def) { try { if (StringUtil.isNotEmpty(value)) { return Integer.parseInt(value); } } catch (Exception e) { return def; } return def; } public static Integer valueOf(String value) { return valueOf(value, 0); } /** * html转议 * * @descript * @param content * @return * @author LJN * @date 2015年4月27日 * @version 1.0 */ public static String htmltoString(String content) { if (content == null) return ""; String html = content; html = html.replace("'", "'"); html = html.replaceAll("&", "&"); html = html.replace("\"", """); // " html = html.replace("\t", " ");// 替换跳格 html = html.replace(" ", " ");// 替换空格 html = html.replace("<", "<"); html = html.replaceAll(">", ">"); return html; } /** * html转议 * * @descript * @param content * @return * @author LJN * @date 2015年4月27日 * @version 1.0 */ public static String stringtohtml(String content) { if (content == null) return ""; String html = content; html = html.replace("'", "'"); html = html.replaceAll("&", "&"); html = html.replace(""", "\""); // " html = html.replace(" ", "\t");// 替换跳格 html = html.replace(" ", " ");// 替换空格 html = html.replace("<", "<"); html = html.replaceAll(">", ">"); return html; } public static Long[] stringArrayToLongArray(String str[]) { Long[] num = null; if (str != null && str.length > 0) { int len = str.length; num = new Long[len]; for (int i = 0; i < len; i++) { num[i] = Long.valueOf(str[i]); } } return num; } public static String fromDateH() { DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); return format1.format(new Date()); } /** * 返回当前时间 格式：yyyy-MM-dd * * @return String */ public static String fromDateY() { DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd"); return format1.format(new Date()); }}7、PropertiesUtils
import java.io.FileOutputStream;import java.io.InputStream;import java.io.Reader;import java.util.Iterator;import java.util.Properties;import java.util.Map.Entry;import org.apache.ibatis.io.Resources;/** * 对属性文件操作的工具类 获取，新增，修改 注意： 以下方法读取属性文件会缓存问题,在修改属性文件时，不起作用， InputStream in = * PropertiesUtils.class.getResourceAsStream("/config.properties"); 解决办法： String * savePath = PropertiesUtils.class.getResource("/config.properties").getPath(); */public class PropertiesUtils{ /** * 获取属性文件的数据 根据key获取值 * * @param fileName * 文件名 (注意：加载的是src下的文件,如果在某个包下．请把包名加上) * @param key * @return */ public static String findPropertiesKey(String key) { try { Properties prop = getProperties(); return prop.getProperty(key); } catch (Exception e) { return ""; } } public static void main(String[] args) { Properties prop = new Properties(); InputStream in = PropertiesUtils.class.getResourceAsStream("/config.properties"); try { prop.load(in); Iterator<Entry<Object, Object>> itr = prop.entrySet().iterator(); while (itr.hasNext()) { Entry<Object, Object> e = (Entry<Object, Object>) itr.next(); System.err.println((e.getKey().toString() + "" + e.getValue().toString())); } in.close(); } catch (Exception e) { } } /** * 返回 Properties * * @param fileName * 文件名 (注意：加载的是src下的文件,如果在某个包下．请把包名加上) * @param * @return */ public static Properties getProperties() { Properties prop = new Properties(); try { Reader reader = Resources.getResourceAsReader("/config.properties"); prop.load(reader); reader.close(); } catch (Exception e) { return null; } return prop; } public static Properties getjdbcProperties() { Properties prop = new Properties(); try { Reader reader = Resources.getResourceAsReader("/jdbc.properties"); prop.load(reader); reader.close(); } catch (Exception e) { return null; } return prop; } /** * 写入properties信息 * * @param key * 名称 * @param value * 值 */ public static void modifyProperties(String key, String value) { try { // 从输入流中读取属性列表（键和元素对） Properties prop = getProperties(); prop.setProperty(key, value); String path = PropertiesUtils.class.getResource("/config.properties").getPath(); FileOutputStream outputFile = new FileOutputStream(path); prop.store(outputFile, "modify"); outputFile.close(); outputFile.flush(); } catch (Exception e) { } }} 0 0
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