java 获取网页json数据 java获取网页指定内容

import java.io.BufferedInputStream; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.ByteArrayOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.io.Writer; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.net.URL; 
import java.util.HashMap; 
import java.util.Map; 
import java.util.Properties; 
import java.util.Set; 

public class openUrl { 
    private static ServerSocket server; 
    private final static int port = 80; 
    
    public static void main(String[] args) { 
        try { 
            server = new ServerSocket(port); 
            System.out.println("server port: " + port + " start..."); 
            } catch (Throwable t) { 
                t.printStackTrace(); 
                return; 
            } 
        nextServerThreadStart(); 
    } 
    
    private static Thread nextServerThreadStart() { 
        Thread t = new Thread(new Runnable() { 
            public void run() { 
                Socket socket = null; 
                try { 
                    socket = server.accept(); 
                } catch (Throwable t) { 
                    t.printStackTrace(); 
                } finally { 
                    nextServerThreadStart(); 
                } 
    
                if (socket != null) { 
                    // System.out.println(socket.getPort()); 
                    Thread t = sendThreadStart(socket); 
                    while (t.isAlive()) { 
                        try { 
                             Thread.sleep(100); 
                        } catch (InterruptedException e) { 
                            // TODO Auto-generated catch block 
                             e.printStackTrace(); 
                        } 
                    } 
                    try { 
                        socket.close(); 
                    } catch (IOException e) { 
                    // TODO Auto-generated catch block 
                        e.printStackTrace(); 
                    } 
                } 
            }
        }); 
        t.start(); 
        return t; 
    } 
    
    private static Thread sendThreadStart(final Socket socket) { 
        Thread t = new Thread(new Runnable() { 
            public void run() { 
            BufferedReader is = null; 
            OutputStream os = null; 
            try { 
                socket.setSoTimeout(20000); 
                Map
   
   
    
     paramters = getParamters(socket); 
                String encoding = paramters.get("encoding"); 
                String url = paramters.get("url"); 
                String content = getURLContent(url, encoding); 
                if (content == null) 
                    return; 
                
                if (content.indexOf("
    
    ", "
    
    "); 
                } 
                Writer out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), encoding)); 
                out.write(content); 
                out.flush(); 
                } catch (Exception e) { 
                    e.printStackTrace(); 
                } finally { 
                /* 
                 * if (out != null){ try { out.close(); } catch (Exception 
                 * e) {} } 
                 */ 
                /* 
                 * if (is != null) { try { is.close(); } catch (Exception e) 
                 * { } } 
                 */ 
                
                    if (os != null) { 
                        try { 
                            os.close(); 
                        } catch (Exception e) { 
                            
                        } 
                    } 
                } 
            
            } 
        }); 
        t.start(); 
        return t; 
    } 
    
    private static String gethead(final Socket socket) throws Exception { 
        InputStream reader = socket.getInputStream(); 
            int available; 
            ByteArrayOutputStream data = new ByteArrayOutputStream(); 
            while ((available = reader.available()) > 0) { 
            byte[] b = new byte[available]; 
            reader.read(b); 
            data.write(b); 
            } 
            // System.out.println(data.toString()); 
            return data.toString(); 
        } 
        
    private static Map
    
    
     
      getParamters(final Socket socket) throws Exception { 
        Map
     
     
      
       map = new HashMap
      
      
       
       (); 
        String head = gethead(socket); 
        if (head.split(" ").length < 2) 
            return map; 
        String GETStr = head.split(" ")[1]; 
        String[] split = GETStr.replaceFirst("%\\?", "").split("[&?]+"); 
        for (String str : split) { 
            int i = str.indexOf("="); 
            if (i >= 1 && i <= str.length() - 2) { 
                map.put(str.substring(0, i), str.substring(i + 1)); 
            } 
        } 
        return map; 
    } 
    
    public static String getURLContent(String url, String encoding) { 
        if (url == null || "".equals(url.trim())) 
        return null; 
    
        StringBuffer content = new StringBuffer(); 
        try { 
        // 新建URL对象 
            URL u = new URL(url); 
            InputStream in = new BufferedInputStream(u.openStream()); 
            InputStreamReader theHTML = new InputStreamReader(in, encoding != null ? encoding : "gb2312"); 
            int c; 
            while ((c = theHTML.read()) != -1) { 
                content.append((char) c); 
            } 
        } 
        // 处理异常 
        catch (MalformedURLException e) { 
            System.err.println(e); 
        } catch (IOException e) { 
            System.err.println(e); 
        } 
        return content.toString(); 
    } 
}