Java Socket应答怎么实现

本篇内容主要讲解"Java Socket应答怎么实现"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Java Socket应答怎么实现"吧!

HTTP/1.1表示这个HTTP服务器是1.1版，200是服务器对客户请求的应答状态码，OK是对应答状态码的解释，之后是这个文档的元信息和文档正文。(相关应答状态码和元信息的解释请参阅Inetrnet标准草案:RFC2616)。

Http.java   import java.net.*;   import java.io.*;   import java.util.Properties;   import java.util.Enumeration;   public class Http {   protected Socket client;   protected BufferedOutputStream sender;   protected BufferedInputStream receiver;   protected ByteArrayInputStream byteStream;   protected URL target;   private int responseCode=-1;   private String responseMessage="";   private String serverVersion="";   private Properties header = new Properties();   public Http() { }   public Http(String url) {   GET(url) ;   }   /* GET方法根据URL，会请求文件、数据库查询结果、程序运行结果等多种内容 */   public void GET(String url) {   try {   checkHTTP(url);   openServer(target.getHost(),target.getPort() );   String cmd = "GET "+ getURLFormat(target) +" HTTP/1.0\r\n"   + getBaseHeads()+"\r\n";   sendMessage(cmd);   receiveMessage();   } catch(ProtocolException p) {   p.printStackTrace();   return;   } catch(UnknownHostException e) {   e.printStackTrace();   return;   } catch(IOException i) {   i.printStackTrace();   return;   }   }   /*   * HEAD方法只请求URL的元信息，不包括URL本身。若怀疑本机和服务器上的   * 文件相同，用这个方法检查最快捷有效。   */   public void HEAD(String url) {   try {   checkHTTP(url);   openServer(target.getHost(),target.getPort() );   String cmd = "HEAD "+getURLFormat(target)+" HTTP/1.0\r\n"   +getBaseHeads()+"\r\n";   sendMessage(cmd);   receiveMessage();   }catch(ProtocolException p) {   p.printStackTrace();   return;   }catch(UnknownHostException e) {   e.printStackTrace();   return;   }catch(IOException i) {   i.printStackTrace();   return;   }   }   /*   * POST方法是向服务器传送数据，以便服务器做出相应的处理。例如网页上常用的   * 提交表格。   */   public void POST(String url,String content) {   try {   checkHTTP(url);   openServer(target.getHost(),target.getPort() );   String cmd = "POST "+ getURLFormat(target) +"HTTP/1.0\r\n"+getBaseHeads();   cmd += "Content-type: application/x-www-form-urlencoded\r\n";   cmd += "Content-length: " + content.length() + "\r\n\r\n";   cmd += content+"\r\n";   sendMessage(cmd);   receiveMessage();   }catch(ProtocolException p) {   p.printStackTrace();   return;   }catch(UnknownHostException e) {   e.printStackTrace();   return;   }catch(IOException i) {   i.printStackTrace();   return;   }   }   protected void checkHTTP(String url) throws ProtocolException {   try {   URL target = new URL(url);   if(target==null || !target.getProtocol().toUpperCase().equals("HTTP") )   throw new ProtocolException("这不是HTTP协议");   this.target = target;   } catch(MalformedURLException m) {   throw new ProtocolException("协议格式错误");   }   }   /*   * 与Web服务器连接。若找不到Web服务器，InetAddress会引发UnknownHostException   * 异常。若Socket连接失败，会引发IOException异常。   */   protected void openServer(String host,int port) throws   UnknownHostException,IOException {   header.clear();   responseMessage=""; responseCode=-1;   try {   if(client!=null) closeServer();   if(byteStream != null) {   byteStream.close(); byteStream=null;   }   InetAddress address = InetAddress.getByName(host);   client = new Socket(address,port==-1?80:port);   sender = new BufferedOutputStream(client.getOutputStream());   receiver = new BufferedInputStream(client.getInputStream());   }catch(UnknownHostException u) {   throw u;   }catch(IOException i) {   throw i;   }   }   /* 关闭与Web服务器的连接 */   protected void closeServer() throws IOException {   if(client==null) return;   try {   client.close(); sender.close(); receiver.close();   } catch(IOException i) {   throw i;   }   client=null; sender=null; receiver=null;   }   protected String getURLFormat(URL target) {   String spec = "http://   +target.getHost();   if(target.getPort()!=-1)   spec+=":"+target.getPort();   return spec+=target.getFile();   }   /* 向Web服务器传送数据 */   protected void sendMessage(String data) throws IOException{   sender.write(data.getBytes(),0,data.length());   sender.flush();   }   /* 接收来自Web服务器的数据 */   protected void receiveMessage() throws IOException{   byte data[] = new byte[1024];   int count=0;   int word=-1;   // 解析***行   while( (word=receiver.read())!=-1 ) {   if(word=='\r'||word=='\n') {   word=receiver.read();   if(word=='\n') word=receiver.read();   break;   }   if(count == data.length) data = addCapacity(data);   data[count++]=(byte)word;   }   String message = new String(data,0,count);   int mark = message.indexOf(32);   serverVersion = message.substring(0,mark);   while( mark-1) {   if(word=='\t') word=32;   if(count==data.length) data = addCapacity(data);   data[count++] = (byte)word;   parseLine: {   while( (symbol=receiver.read()) >-1 ) {   switch(symbol) {   case '\t':   symbol=32; break;   case '\r':   case '\n':   word = receiver.read();   if( symbol=='\r' && word=='\n') {   word=receiver.read();   if(word=='\r') word=receiver.read();   }   if( word=='\r' || word=='\n' || word>32) break parseLine;   symbol=32; break;   }   if(count==data.length) data = addCapacity(data);   data[count++] = (byte)symbol;   }   word=-1;   }   message = new String(data,0,count);   mark = message.indexOf(':');   String key = null;   if(mark>0) key = message.substring(0,mark);   mark++;   while( mark0) byteStream = new ByteArrayInputStream(data,0,count);   data=null;   closeServer();   }   public String getResponseMessage() {   return responseMessage;   }   public int getResponseCode() {   return responseCode;   }   public String getServerVersion() {   return serverVersion;   }   public InputStream getInputStream() {   return byteStream;   }   public synchronized String getHeaderKey(int i) {   if(i>=header.size()) return null;   Enumeration enum = header.propertyNames();   String key = null;   for(int j=0; j<=i; j++)   key = (String)enum.nextElement();   return key;   }   public synchronized String getHeaderValue(int i) {   if(i>=header.size()) return null;   return header.getProperty(getHeaderKey(i));   }   public synchronized String getHeaderValue(String key) {   return header.getProperty(key);   }   protected String getBaseHeads() {   String inf = "User-Agent: myselfHttp/1.0\r\n"+   "Accept: www/source; text/html; image/gif; */*\r\n";   return inf;   }   private byte[] addCapacity(byte rece[]){   byte temp[] = new byte[rece.length+1024];   System.arraycopy(rece,0,temp,0,rece.length);   return temp;   }   public static void main(String[] args) {   Http http=new Http();   //http.GET("http://192.168.1.5   );   int i;   for (i=0; i<50000; i++) {   http.GET("http://www.model-dl.com/modelinfo.asp?modelid=101 );   http.POST("http://www.model-dl.com/modelinfo.asp?modelid=101,"ratecontd=101&MM_insert=form1 ");   }   }   }

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