手写服务器最终版本;
      
          
               
       
        login
                
       
        com.bjsxt.servlet.LoginWeb
            
            
                
       
        login
                 
       
        /g
                 
       
        /y
             
       
        public class CloseUtil {    /**     * 关闭IO流     */    /*    public static void closeIO(Closeable... io){        for(Closeable temp:io){            try {                if (null != temp) {                    temp.close();                }            } catch (Exception e) {            }        }    }*/    /**     * 使用泛型方法实现关闭IO流     * @param io     */    public static 
     
       void closeIO(T... io){        for(Closeable temp:io){            try {                if (null != temp) {                    temp.close();                }            } catch (Exception e) {            }        }    }    public static  void closeSocket(ServerSocket socket){        try {            if (null != socket) {                socket.close();            }        } catch (Exception e) {        }    }    public static  void closeSocket(Socket socket){        try {            if (null != socket) {                socket.close();            }        } catch (Exception e) {        }}    public static  void closeSocket(DatagramSocket socket){            try {                if (null != socket) {                    socket.close();                }            } catch (Exception e) {            }    }}/** * 抽象为一个父类 * @author Administrator * */public abstract class Servlet {    public void service(Request req,Response rep) throws Exception{        this.doGet(req,rep);        this.doPost(req,rep);    }        protected abstract void doGet(Request req,Response rep) throws Exception;    protected abstract void doPost(Request req,Response rep) throws Exception;}public class LoginWeb extends Servlet {    @Override    public void doGet(Request req, Response rep) throws Exception {        rep.println("success.....");    }    @Override    public void doPost(Request req, Response rep) throws Exception {        // TODO Auto-generated method stub            }}/** * 创建服务器，并启动 *  * 1、请求 * 2、响应 * @author Administrator * */public class Server {    private ServerSocket server;    public static final String CRLF="\r\n";    public static final String BLANK=" ";        private boolean isShutDown= false;    /**     * @param args     */    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 {            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;        CloseUtil.closeSocket(server);    }        }public class ServletContext {    //为每一个servlet取个别名      // login  -->com.bjsxt.server.demo03.LoginServlet    private Map
      
        servlet ;    //url -->login    //   /log -->login    //   /login -->login    private Map
       
         mapping;        ServletContext(){        servlet =new HashMap
        
         ();        mapping =new HashMap
         
          ();    }            public Map
          
            getServlet() { return servlet; } public void setServlet(Map
           
             servlet) { this.servlet = servlet; } public Map
            
              getMapping() { return mapping; } public void setMapping(Map
             
               mapping) { this.mapping = mapping; }}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("WEB_INFO/web.xml"), web); //将list 转成Map contxt =new ServletContext(); Map
              
                servlet =contxt.getServlet(); //servlet-name servlet-class for(Entity entity:web.getEntityList()){ servlet.put(entity.getName(), entity.getClz()); } //url-pattern servlet-name Map
               
                 mapping =contxt.getMapping(); for(Mapping mapp:web.getMappingList()){ List
                
                  urls =mapp.getUrlPattern(); for(String url:urls ){ mapping.put(url, mapp.getName()); } } } catch (Exception e) { } } public static Servlet getServlet(String url) throws InstantiationException, IllegalAccessException, ClassNotFoundException{ if((null==url)||(url=url.trim()).equals("")){ return null; } //根据字符串(完整路径)创建对象 //return contxt.getServlet().get(contxt.getMapping().get(url)); String name=contxt.getServlet().get(contxt.getMapping().get(url)); return (Servlet)Class.forName(name).newInstance();//确保空构造存在 }}public class WebHandler extends DefaultHandler{ private List
                 
                   entityList; private List
                  
                    mappingList; private Entity entity; private Mapping mapping; private String beginTag ; private boolean isMap; @Override public void startDocument() throws SAXException { //文档解析开始 entityList =new ArrayList
                   
                    () ; mappingList =new ArrayList
                    
                     () ; } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { //开始元素 if(null!=qName){ beginTag=qName; if(qName.equals("servlet")){ isMap=false; entity=new Entity(); }else if(qName.equals("servlet-mapping")){ isMap=true; mapping=new Mapping(); } } } @Override public void characters(char[] ch, int start, int length) throws SAXException { //处理内容 if(null!=beginTag){ String str =new String(ch,start,length); if(isMap ){ if(beginTag.equals("servlet-name")){ mapping.setName(str); }else if(beginTag.equals("url-pattern")){ mapping.getUrlPattern().add(str); } }else{ if(beginTag.equals("servlet-name")){ entity.setName(str); }else if(beginTag.equals("servlet-class")){ entity.setClz(str); } } } } @Override public void endElement(String uri, String localName, String qName) throws SAXException { //结束元素 if(null!=qName){ if(qName.equals("servlet")){ entityList.add(entity); }else if(qName.equals("servlet-mapping")){ mappingList.add(mapping); } } beginTag=null; } @Override public void endDocument() throws SAXException { //文档解析结束 } /*public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException { //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/bjsxt/server/demo4/web.xml") ,web); System.out.println(web.getEntityList()); }*/ public List
                     
                       getEntityList() { return entityList; } public void setEntityList(List
                      
                        entityList) { this.entityList = entityList; } public List
                       
                         getMappingList() { return mappingList; } public void setMappingList(List
                        
                          mappingList) { this.mappingList = mappingList; } }/** * 封装响应信息 * @author Administrator * */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(Socket client){ this(); try { bw= new BufferedWriter(new OutputStreamWriter(client.getOutputStream())); } catch (IOException e) { headInfo=null; } } public Response(OutputStream os){ this(); bw= new BufferedWriter(new OutputStreamWriter(os)); } /** * 构建正文 */ public Response print(String info){ content.append(info); len+=info.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 505: headInfo.append("SEVER ERROR"); break; } headInfo.append(CRLF); //2) 响应头(Response Head) headInfo.append("Server:bjsxt 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); //分隔符 } //推送到客户端 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(); } public void close(){ CloseUtil.closeIO(bw); } }/** * 封装request * @author Administrator * */public class Request { //请求方式 private String method; //请求资源 private String url; //请求参数 private Map
                         
                          
                           > parameterMapValues; //内部 public static final String CRLF="\r\n"; private InputStream is; private String requestInfo; public Request(){ method =""; url =""; parameterMapValues=new HashMap
                           
                            
                             >(); requestInfo=""; } public Request(InputStream is){ this(); this.is=is; try { byte[] data = new byte[20480]; int len = is.read(data); requestInfo = new String(data, 0, len); } catch (Exception e) { return ; } //分析请求信息 parseRequestInfo(); } /** * 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?name=123&pwd=5456 HTTP/1.1 * * 如果为post方式，请求参数可能在 最后正文中 * * 思路: * 1)请求方式 :找出第一个/ 截取即可 * 2)请求资源:找出第一个/ HTTP/ * ===================================== */ String paramString =""; //接收请求参数 //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")){ this.url=urlStr; paramString=requestInfo.substring(requestInfo.lastIndexOf(CRLF)).trim(); }else if(this.method.equalsIgnoreCase("get")){ if(urlStr.contains("?")){ //是否存在参数 String[] urlArray=urlStr.split("\\?"); this.url=urlArray[0]; paramString=urlArray[1];//接收请求参数 }else{ this.url=urlStr; } } //不存在请求参数 if(paramString.equals("")){ return ; } //2、将请求参数封装到Map中 parseParams(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"); //转换成Map 分拣 if(!parameterMapValues.containsKey(key)){ parameterMapValues.put(key,new ArrayList
                             
                              ()); } List
                              
                                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 * @param args */ public String[] getParameterValues(String name){ List
                               
                                 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 * @param args */ public String getParameter(String name){ String[] values =getParameterValues(name); if(null==values){ return null; } return values[0]; } public String getUrl() { return url; } public void close(){ CloseUtil.closeIO(is); }}/* 
                                 
                                 
                                  login
                                  
                                 
                                  /login
                                  
                                 
                                 
                                 
                                  login
                                  
                                 
                                  /log
                                  
                                 */public class Mapping { private String name; private List
                                
                                  urlPattern; public Mapping(){ urlPattern =new ArrayList
                                 
                                  (); } public String getName() { return name; } public void setName(String name) { this.name = name; } public List
                                  
                                    getUrlPattern() { return urlPattern; } public void setUrlPattern(List
                                   
                                     urlPattern) { this.urlPattern = urlPattern; } }/* 
                                     
                                     
                                      login
                                      
                                     
                                      com.bjsxt.server.demo4.LoginServlet
                                      
                                     */public class Entity { private String name; private String clz; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getClz() { return clz; } public void setClz(String clz) { this.clz = clz; } }/** * 一个请求与响应 就一个此对象 * @author Administrator * */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; 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(500); } catch (IOException e) { e.printStackTrace(); } req.close(); rep.close(); CloseUtil.closeSocket(client); }}