http请求模拟

服务器代码：

package com.infohold.http;

import java.net.*;
public class WebServer {
 public static void main(String args[]) {
  int i=1, PORT=80;
  ServerSocket server=null;
  Socket client=null;
  try {
   server=new ServerSocket(PORT);
   System.out.println("Web Server is listening on port "+server.getLocalPort());
   for (;;) {
    client=server.accept(); // 接受客户机的连接请求
    new ConnectionThread(client,i).start();
    i++;
    }
   } catch (Exception e){
    System.out.println(e);
   }
 }
}

package com.infohold.http;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;

class ConnectionThread extends Thread {
      Socket client; // 连接Web浏览器的socket字
      int counter; // 计数器
     
      public ConnectionThread(Socket cl,int c) {
       client=cl;
       counter=c;
      }
     
      public void run() {
        try {
            String destIP=client.getInetAddress().toString(); // 客户机IP地址
            int destport=client.getPort(); // 客户机端口号
            System.out.println("Connection "+counter+":connected to "+destIP+" on port "+destport+".");
            PrintStream outstream=new PrintStream(client.getOutputStream());
            DataInputStream instream=new DataInputStream(client.getInputStream());
            String inline=instream.readLine(); // 读取Web浏览器提交的请求信息
            System.out.println("Received:"+inline);
            if (getrequest(inline)) { // 如果是GET请求
              String filename=getfilename(inline);
              File file=new File("D:/temp/"+filename);
              if (file.exists()) { // 若文件存在，则将文件送给Web浏览器
                System.out.println(filename+" requested.");
                outstream.println("HTTP/1.0 200 OK");
                outstream.println("MIME_version:1.0");
                outstream.println("Content_Type:text/html");
                int len=(int)file.length();
                outstream.println("Content_Length:"+len);
                outstream.println("");
                //outstream.println("{\"data\":{\"message\":[{\"cbsMessage\":{\"header\":{\"system_id\":\"00001\",\"compress\":\"0\"},\"transaction\":{\"code\":\"T000011\",\"time\":\"1350549273\",\"sequence\":\"20120622123456\"},\"body\":\"eyJPcmRlcklkIjoiQzAwMDAxIiwiQXJlYUlkIjoiMCIsIkNoYW5uZWwiOiIwMSIsIlRpY2tldHMiOlt7IlRpY2tldE5vIjoiMTAwMDAwMDA4OCIsIlR5cGUiOiIwMCIsIlByaWNlIjoiMTAwLjAwIiwiQ2hhcmdlIjoiMC41In1dLCJUeXBlIjoiOTkiLCJUaWNrZXRObyI6IjAwMDAwNjUiLCJDaGVja0RhdGUiOiIyMDEyLTEwLTIyIiwiRGV2aWNlIjoiMDc1NDM0NDU0IiwiT3RoZXJObyI6IjA2NTUiLCJPdGhlckJyY05vIjoiMDM0NDMzIiwiUHJpY2UiOiIxMDAiLCJSZWZ1bmREYXRlIjoiMjAxMi0xMC0yMiIsIlBheURhdGUiOiIyMDEyLTEwLTIyIiwiVmFsaWREYXRlIjoiMjAxMi0xMC0yMiJ9\"}}]}}");
               // outstream.println("{\"data\": {\"messages\": {\"cbsMessage\": [{\"header\": {\"system_id\": \"T\",\"encrypt\": \"0\",\"compress\": \"0\"},\"transaction\": {\"code\": \"T000011\",\"time\": \"\",\"sequence\": \"20120622123456\"},\"body\":\"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\"}]}}}");
                outstream.println("{\"return_message\": \"success\", \"data\": {\"count\": 1, \"messages\": [{\"cbsMessage\": {\"body\": \"eyJhcmVhX2lkIjoiQzAwMDAxIiwiY2hhbm5lbCI6IjAiLCJ0aWNrZXRzIjpbeyJ0aWNrZXRfbm8i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\r\nMDAifQ==\", \"header\": {\"encrypt\": \"0\", \"system_id\": \"T\", \"compress\": \"0\"}, \"transaction\": {\"code\": \"EBP0001\", \"sequence\": \"1351049022514945\", \"time\": \"1351049022\"}}}]}, \"return_code\": 0}");
                //sendfile(outstream,file); // 发送文件
                outstream.flush();
              } else { // 文件不存在时
                System.out.println("erro requested.");
//                String notfound="<html><head><title>Not Foundmm</title></head><body><h1>Error 404-file not found</h1></body></html>";
//                outstream.println("HTTP/1.0 404 no found");
//                outstream.println("Content_Type:text/html");
//                outstream.println("Content_Length:"+notfound.length()+2);
                outstream.println("HTTP/1.0 200 OK");
                outstream.println("MIME_version:1.0");
                outstream.println("");
                outstream.println("{\"data\":{\"message\":{\"cbsMessage\":{\"header\":{\"system_id\":\"00001\",\"compress\":\"0\"},\"transaction\":{\"code\":\"T000011\",\"time\":\"1350549273\",\"sequence\":\"20120622123456\"}},\"body\":\"eyJPcmRlcklkIjoiQzAwMDAxIiwiQXJlYUlkIjoiMCIsIkNoYW5uZWwiOjAxLCJUaWNrZXRzIjpbIlRpY2tldE5vIjoiMTAwMDAwMDA4OCIsIlR5cGUiOiIwMCIsIlByaWNlIjoiMTAwLjAwIiwiQ2hhcmdlIjoiMC41Il0sIlR5cGUiOiI5OSIsIlRpY2tldE5vIjoiMDAwMDA2NSIsIkNoZWNrRGF0ZSI6IjIwMTItMTAtMjIiLCJEZXZpY2UiOiIwNzU0MzQ0NTQiLCJPdGhlck5vIjoiMDY1NSIsIk90aGVyQnJjTm8iOiIwMzQ0MzMiLCJQcmljZSI6IjEwMCIsIlJlZnVuZERhdGUiOiIyMDEyLTEwLTIyIiwiUGF5RGF0ZSI6IjIwMTItMTAtMjIiLCJWYWxpZERhdGUiOiIyMDEyLTEwLTIyIn0=\"}}}}");
                //outstream.println("{\"cbsMessage\":{\"header\":{\"system_id\":\"T\",\"encrypt\":\"0\",\"compress\":\"0\"},\"transaction\":{\"code\":\"EBP0001\",\"time\":\"1350907856\",\"sequence\":\"13509078560716060\"},\"body\":\"eyJhcmVhX2lkIjoiQzAwMDAxIiwiY2hhbm5lbCI6IjAiLCJ0aWNrZXRfdG90YWwiOjE5OTk5OTk5\r\nOC4wMCwidGlja2V0cyI6WyIxMDAwMDAwMDg4IiwiMTAwMDAwMDA4OSJdLCJpbmRpY2F0b3IiOiIw\r\nIiwidGlja2V0X2RhdGUiOiIyMDEyLTEwLTIyIDIwOjEwOjU2IiwidmFsaWRfZGF0ZSI6IjIwMTIt\r\nMTAtMjIgMDA6MDA6MDAifQ\u003d\u003d\"}}");
                outstream.flush();
             }
            }
            long m1=1;
            while (m1<11100000) {m1++;} // 延时
                 client.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
       }
     
      /* 获取请求类型是否为“GET” */
      boolean getrequest(String s) {
         if (s.length()>0){
          if (s.substring(0,3).equalsIgnoreCase("GET"))
           return true;
          }
         return false;
      }
     
      /* 获取要访问的文件名 */
      String getfilename(String s) {
          String f=s.substring(s.indexOf(' ')+1);
          f=f.substring(0,f.indexOf(' '));
          try {
            if (f.charAt(0)=='/')
                 f=f.substring(1);
          } catch (StringIndexOutOfBoundsException e) {
               System.out.println("Exception:"+e);
          }
          if (f.equals("")) f="index.html";
          System.out.println(f);
          return f;
     }
     
      /*把指定文件发送给Web浏览器 */
      void sendfile(PrintStream outs,File file) {
         try {
            DataInputStream in=new DataInputStream(new FileInputStream(file));
            int len=(int)file.length();
            byte buf[]=new byte[len];
            in.readFully(buf);
            outs.write(buf,0,len);
            outs.flush();
            in.close();
         } catch (Exception e) {
            System.out.println("Error retrieving file.");
            System.exit(1);
         }
     }
}

客户端代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

public class WebClient{
 public static String  getWebContent(String urlString,final String charset,int timeout) throws IOException {
  if(urlString==null||urlString.length()==0) {
   return null;
  }
  urlString = (urlString.startsWith("http://") || urlString
    .startsWith("https://")) ? urlString : ("http://" + urlString)
    .intern();
  URL url = new URL(urlString);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  conn
    .setRequestProperty(
      "User-Agent",
      "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");//增加报头，模拟浏览器，防止屏蔽
  conn.setRequestProperty("Accept", "text/html");//只接受text/html类型，当然也可以接受图片,pdf,*/*任意，就是tomcat/conf/web里面定义那些
  conn.setConnectTimeout(timeout);
  try {
   if(conn.getResponseCode()!=HttpURLConnection.HTTP_OK) {
    return null;
   }
  } catch (IOException e) {
   e.printStackTrace();
   return null;
  }
  InputStream input = conn.getInputStream();
  BufferedReader reader = new BufferedReader(new InputStreamReader(input,
    charset));
  String line = null;
  StringBuffer sb = new StringBuffer();
  while ((line = reader.readLine()) != null) {
   sb.append(line).append("\r\n");
  }
  if(reader!=null) {
   reader.close();
  }
  if(conn!=null) {
   conn.disconnect();
  }
  return sb.toString();
 
 }
 public static String getWebContent(String urlString) {
 String dealUrl="";
    try {
     dealUrl= getWebContent(urlString,"iso-8859-1",5000);
 } catch (Exception e) {
  e.printStackTrace();
 }
 return dealUrl;
 }
 
 public static void main(String[]args){
  String s = getWebContent("http://127.0.0.1/index2.html");
  try {
  s = new String(s.getBytes("iso-8859-1"),"gb2312");
 } catch (Exception e) {
  e.printStackTrace();
 }
  System.out.println(s);
 }
}