一个URL读写器/写入器类，它向URL写入/从URL读取数据

import java.io.BufferedReader;
/**
来 自 N o  w  J a v a . c o m - 时  代  Java
**/

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.net.URL;

import java.net.URLConnection;

import java.util.Map;


public class Main {

  public static String getURLContent(String urlStr, String input) {

    BufferedReader br = null;

    BufferedWriter bw = null;/** n o w j a   v  a . c o m - 时  代  Java 提 供 **/


    try {

      URL url = new URL(urlStr);

      URLConnection connection = url.openConnection();


      connection.setDoOutput(true);

      connection.connect();


      OutputStream ous = connection.getOutputStream();

      bw = new BufferedWriter(new OutputStreamWriter(ous));

      bw.write(input);

      bw.flush();

      bw.close();


      printRequestHeaders(connection);


      InputStream ins = connection.getInputStream();


      br = new BufferedReader(new InputStreamReader(ins));


      StringBuffer sb = new StringBuffer();

      String msg = null;

      while ((msg = br.readLine()) != null) {

        sb.append(msg);

        sb.append("\n"); // Append a new line

      }


      return sb.toString();

    }

    catch (IOException e) {

      e.printStackTrace();

    }

    finally {

      if (br != null) {

        try {

          br.close();

        }

        catch (IOException e) {

          e.printStackTrace();

        }

      }

    }

    return null;

  }


  public static void printRequestHeaders(URLConnection connection) {

    Map headers = connection.getHeaderFields();