手写服务器httpserver_xml配置文件_sax解析基础应用JAVA205-206
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一、S02E205_01手写服务器httpserver_xml配置文件_sax解析基础
XML
package com.test.xml;import java.io.IOException;import java.util.List;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.SAXException;public class ParseDemo { public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException { //1、获取解析工厂 SAXParserFactory factory = SAXParserFactory.newInstance(); //2、从解析工厂获取解析器 SAXParser parser = factory.newSAXParser(); //3、加载文档Document注册处理器 //4、编写处理器 PersonHandler handler = new PersonHandler(); parser.parse(Thread.currentThread().getContextClassLoader() .getResourceAsStream("com/test/xml/person.xml") ,handler); List<Person> persons = handler.getPersons(); for (Person p : persons) { System.out.println(p.getName() + "-->>" + p.getAge()); } }}package com.test.xml;import java.util.ArrayList;import java.util.List;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;/** * 存储对象 */public class PersonHandler extends DefaultHandler{ private List<Person> persons; private Person person; private String tag;//记录标签名 public List<Person> getPersons() { return persons; } public void setPersons(List<Person> persons) { this.persons = persons; } @Override public void startDocument() throws SAXException { //System.out.println("处理文档开始"); persons = new ArrayList<Person>(); } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { System.out.println("开始一个元素" + qName); if(null!=qName){ tag = qName; } if(null!=qName && qName.equals("person")){ person = new Person(); } } @Override public void characters(char[] ch, int start, int length) throws SAXException { //System.out.println(new String(ch,start,length)); String str = new String(new String(ch,start,length)); if(null!=tag && tag.equals("name")){ person.setName(str); }else if(null!=tag && tag.equals("age")){ Integer age = Integer.valueOf(str); person.setAge(age); } } @Override public void endElement(String uri, String localName, String qName) throws SAXException { //System.out.println("结束一个元素" + qName); if(qName.equals("person")){ this.persons.add(person); } tag = null; } @Override public void endDocument() throws SAXException { System.out.println("处理文档结束"); }}package com.test.xml;public class Person { private String name; private int age; public Person() { } public Person(String name, int age) { super(); this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; }}控制台输出：开始一个元素persons开始一个元素person开始一个元素name开始一个元素age开始一个元素person开始一个元素name开始一个元素age处理文档结束至尊宝-->>9000白晶晶-->>7000二、S02E206_01手写服务器httpserver_xml配置文件_sax解析应用
<html> <head> <title>第一个表单</title> </head> <body> <form method="get" action="http://localhost:8888/g"> 用户名：<input type="text" name="uname" id="name"> 密码：<input type="password" name="pwd" id="pass"> <input type="submit" value="登录"> </form> </body></html>web.xml文件
<?xml version="1.0" encoding="UTF-8" ?><web_app> <servlet> <servlet-name>login</servlet-name> <servlet-class>com.test.server2.LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>login</servlet-name> <url-pattern>/login</url-pattern> <url-pattern>/log</url-pattern> <url-pattern>/g</url-pattern> </servlet-mapping> <servlet> <servlet-name>reg</servlet-name> <servlet-class>com.test.server2.RegisterServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>reg</servlet-name> <url-pattern>/reg</url-pattern> </servlet-mapping></web_app>源码：
package com.test.server2;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;/** * 创建服务器，并启动 * 1、请求 * 2、响应 */public class Server { private ServerSocket server; private boolean isShutDown = false; public static void main(String[] args) { Server server = new Server(); server.start(); } /** * 启动方法 */ public void start(){ start(8888); } /** * 指定端口的启动方法 */ public void start(int port){ try { server = new ServerSocket(port); this.receive(); } catch (IOException e) { //e.printStackTrace(); stop(); } } /** * 接收客户端 */ private void receive(){ try { //请求及响应 while(!isShutDown){ new Thread(new Dispatcher(server.accept())).start(); } } catch (IOException e) { //e.printStackTrace(); stop(); } } /** * 停止服务器 */ public void stop(){ isShutDown = true; try { if(!(null==server)){ server.close(); } } catch (IOException e) { //e.printStackTrace(); } }}package com.test.server2;import java.io.IOException;import java.net.Socket;/** * 一个请求与响应，就一个对象 */public class Dispatcher implements Runnable{ private Socket client; private Request req; private Response rep; private int code = 200; Dispatcher(Socket client){ this.client = client; try { req = new Request(client.getInputStream()); rep = new Response(client.getOutputStream()); } catch (IOException e) { //e.printStackTrace(); code = 500; try { rep.pushToClient(code); } catch (IOException e1) { //e1.printStackTrace(); } return; } } @Override public void run() { try { Servlet serv = WebApp.getServlet(req.getUrl()); if(null==serv){ this.code = 404;//找不到处理 }else{ serv.service(req, rep); } rep.pushToClient(code);//推送到客户端 } catch (Exception e) { //e.printStackTrace(); this.code = 500; try { rep.pushToClient(code); } catch (IOException e1) { e1.printStackTrace(); } } try { client.close(); } catch (IOException e) { //e.printStackTrace(); } }}package com.test.server2;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.Arrays;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.StringTokenizer;/** * 封装request */public class Request { //请求方式 private String method; //请求资源 private String url; //请求参数 private Map<String,List<String>> parameterMapValues; //内部 public static final String CRLF = "\r\n"; private InputStream is; private String requestInfo; public Request(){ method = ""; url = ""; parameterMapValues = new HashMap<String,List<String>>(); requestInfo = ""; } public Request(InputStream is){ this(); this.is = is; try { byte[] data = new byte[204800]; int len = is.read(data); requestInfo = new String(data,0,len); } catch (IOException e) { return; } //分析请求信息 parseRequestInfo(); } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } /** * 分析请求信息 */ private void parseRequestInfo(){ if((null==requestInfo) || (requestInfo=requestInfo.trim()).equals("")){ return; } /** * ==================================== * 从信息的首行分解出：请求方式 请求路径 请求参数（get可能存在） * 如：GET /index.html?uname=intputUname&pwd=inputPassword HTTP/1.1 * * 如果为post方式，请求参数可能在最后正文中 * ==================================== */ String paramString = "";//接收请求参数 int positionCRLF = 0; positionCRLF = requestInfo.indexOf(CRLF); if (positionCRLF == -1){ return; } //1、获取请求方式 String firstLine = requestInfo.substring(0,requestInfo.indexOf(CRLF)); int idx = requestInfo.indexOf("/");// /的位置 this.method = firstLine.substring(0,idx).trim(); String urlStr = firstLine.substring(idx,firstLine.indexOf("HTTP/")).trim(); if(this.method.equalsIgnoreCase("post")){//post方式 this.url = urlStr; paramString = requestInfo.substring(requestInfo.lastIndexOf(CRLF)).trim(); }else if(this.method.equalsIgnoreCase("get")){//get方式 if(urlStr.contains("?")){ String[] urlArray = urlStr.split("\\?"); this.url = urlArray[0]; paramString = urlArray[1];//接收请求参数 }else{ this.url = urlStr; } } //2、将请求参数封装到Map中 parseParams(paramString); } /** * 将请求参数封装到Map中 * @param paramString */ private void parseParams(String paramString){ //分割，将字符串转成数组 StringTokenizer token = new StringTokenizer(paramString,"&"); while(token.hasMoreTokens()){ String keyValue = token.nextToken(); String[] keyValues = keyValue.split("="); if(keyValues.length == 1){ keyValues = Arrays.copyOf(keyValues, 2); keyValues[1] = null; } String key = keyValues[0].trim(); String value = null==keyValues[1]?null:decode(keyValues[1].trim(),"gbk"); //分拣，转换成Map if(!parameterMapValues.containsKey(key)){ parameterMapValues.put(key, new ArrayList<String>()); } List<String> values = parameterMapValues.get(key); values.add(value); } } /** * 解决中文 * @param value * @param code * @return */ private String decode(String value,String code){ try { return java.net.URLDecoder.decode(value, code); } catch (UnsupportedEncodingException e) { //e.printStackTrace(); } return null; } /** * 根据页面的name获取对应的多个值 */ public String[] getParameterValues(String name){ List<String> values = null; if( (values=parameterMapValues.get(name))==null ){ return null; }else{ return values.toArray(new String[0]); } } /** * 根据页面的name获取对应的单个值 */ public String getParameterValue(String name){ String[] values = getParameterValues(name); if(null==values){ return null; } return values[0]; }}package com.test.server2;import java.io.BufferedWriter;import java.io.IOException;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.Socket;import java.util.Date;/** * 封装响应信息 */public class Response { //两个常量 public static final String CRLF = "\r\n"; public static final String BLANK = " "; //流 private BufferedWriter bw; //正文 private StringBuilder content; //存储头信息 private StringBuilder headInfo; //存储正文长度 private int len = 0; public Response(){ headInfo = new StringBuilder(); content = new StringBuilder(); len = 0; } public Response(OutputStream os){ this(); bw = new BufferedWriter(new OutputStreamWriter(os)); } public Response(Socket client){ this(); try { bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream())); } catch (IOException e) { headInfo = null; } } /** * 构建正文 */ public Response print(String info){ content.append(info); len += (info + CRLF).getBytes().length; return this; } /** * 构建正文+回车 */ public Response println(String info){ content.append(info).append(CRLF); len += (info + CRLF).getBytes().length; return this; } /** * 构建响应头 */ private void createHeadInfo(int code){ //1)HTTP协议版本、状态代码、描述 headInfo.append("HTTP/1.1").append(BLANK).append(code).append(BLANK); switch(code){ case 200: headInfo.append("OK"); break; case 404: headInfo.append("NOT FOUND"); break; case 500: headInfo.append("Server Error"); break; } headInfo.append(CRLF); //2)响应头（Response Head） headInfo.append("Server:test Server/0.0.1").append(CRLF); headInfo.append("Date:").append(new Date()).append(CRLF); headInfo.append("Content-type:text/html;charset=GBK").append(CRLF); //正文长度：字节长度 headInfo.append("Content-Length:").append(len).append(CRLF); headInfo.append(CRLF); } /** * 推送到客户端 * @throws IOException */ void pushToClient(int code) throws IOException{ if(null==headInfo){ code = 500; } createHeadInfo(code); //头信息+分割符 bw.append(headInfo.toString()); //正文 bw.append(content.toString()); bw.flush(); bw.close(); }}package com.test.server2;import java.io.IOException;import java.util.List;import java.util.Map;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;public class WebApp { private static ServletContext contxt; static{ try { //获取解析工厂 SAXParserFactory factory = SAXParserFactory.newInstance(); //获取解析器 SAXParser sax = factory.newSAXParser(); //指定xml + 处理器 WebHandler web = new WebHandler(); sax.parse(Thread.currentThread().getContextClassLoader() .getResourceAsStream("com/test/server2/web.xml") ,web); //将List转成Map contxt = new ServletContext(); Map<String,String> servlet = contxt.getServlet(); //servlet-name,servlet-class for (Entity entity : web.getEntityList()) { servlet.put(entity.getName(), entity.getClz()); } //url-pattern,servlet-name Map<String,String> mapping = contxt.getMapping(); for (Mapping mapp : web.getMappingList()) { List<String> urls = mapp.getUrlPattern(); for (String url : urls) { mapping.put(url, mapp.getName()); } } } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (org.xml.sax.SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static Servlet getServlet(String url) throws InstantiationException, IllegalAccessException, ClassNotFoundException{ if(null==url || (url=url.trim()).equals("")){ return null; } //return contxt.getServlet().get(contxt.getMapping().get(url)); //根据字符串（完整路径）创建对象 String name = contxt.getServlet().get(contxt.getMapping().get(url)); return (Servlet)Class.forName(name).newInstance();//确保空构造存在 }}package com.test.server2;/** * 抽象为一个父类 */public abstract class Servlet { public void service(Request req,Response rep) throws Exception{ this.doGet(req,rep); this.doPost(req,rep); } public abstract void doGet(Request req,Response rep) throws Exception; public abstract void doPost(Request req,Response rep) throws Exception;}package com.test.server2;import java.util.HashMap;import java.util.Map;/** * 上下文 */public class ServletContext { //为每一个servlet取别名 // login-->com.test.server2.LoginServlet private Map<String,String> servlet; // url-->login // /log-->login // /login-->login private Map<String,String> mapping; public ServletContext() { servlet = new HashMap<String,String>(); mapping = new HashMap<String,String>(); } public Map<String, String> getServlet() { return servlet; } public void setServlet(Map<String, String> servlet) { this.servlet = servlet; } public Map<String, String> getMapping() { return mapping; } public void setMapping(Map<String, String> mapping) { this.mapping = mapping; }}package com.test.server2;public class LoginServlet extends Servlet{ @Override public void doGet(Request req,Response rep) throws Exception { String name = req.getParameterValue("uname"); String pwd = req.getParameterValue("pwd"); if(login(name, pwd)){ rep.println("登录成功"); }else{ rep.println("登录失败"); } } public boolean login(String name,String pwd){ return name.equals("test") && pwd.equals("12346"); } @Override public void doPost(Request req,Response rep) throws Exception { }}package com.test.server2;public class RegisterServlet extends Servlet{ @Override public void doGet(Request req, Response rep) throws Exception { } @Override public void doPost(Request req, Response rep) throws Exception { rep.println("<html><head><title>返回注册</title>"); rep.println("</head><body>"); rep.println("你的用户名为：" + req.getParameterValue("uname")); rep.println("</body></html>"); }} 0 0
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