HttpURLConnection发送请求

每个 HttpURLConnection 实例都可用于生成单个请求，但是其他实例可以透明地共享连接到 HTTP 服务器的基础网络。请求后在 HttpURLConnection 的 InputStream 或 OutputStream 上调用 close() 方法可以释放与此实例关联的网络资源，但对共享的持久连接没有任何影响。如果在调用 disconnect() 时持久连接空闲，则可能关闭基础套接字。JAVA使用HttpURLConnection发送POST数据是依靠OutputStream流的形式发送

package com.newflypig.demo;
/**
 * 使用jdk自带的HttpURLConnection向URL发送POST请求并输出响应结果
 * 参数使用流传递，并且硬编码为字符串"name=XXX"的格式
 */
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
public class SendPostDemo {
  public static void main(String[] args) throws Exception{
    String urlPath = new String("http://localhost:8080/Test1/HelloWorld"); 
    //String urlPath = new String("http://localhost:8080/Test1/HelloWorld?name=丁丁".getBytes("UTF-8"));
    String param="name="+URLEncoder.encode("丁丁","UTF-8");
    //建立连接
    URL url=new URL(urlPath);
    HttpURLConnection httpConn=(HttpURLConnection)url.openConnection();
    //设置参数
    httpConn.setDoOutput(true);   //需要输出
    httpConn.setDoInput(true);   //需要输入
    httpConn.setUseCaches(false);  //不允许缓存
    httpConn.setRequestMethod("POST");   //设置POST方式连接
    //设置请求属性
    httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    httpConn.setRequestProperty("Connection", "Keep-Alive");// 维持长连接
    httpConn.setRequestProperty("Charset", "UTF-8");
    //连接,也可以不用明文connect，使用下面的httpConn.getOutputStream()会自动connect
    httpConn.connect();
    //建立输入流，向指向的URL传入参数
    DataOutputStream dos=new DataOutputStream(httpConn.getOutputStream());
    dos.writeBytes(param);
    dos.flush();
    dos.close();
    //获得响应状态
    int resultCode=httpConn.getResponseCode();
    if(HttpURLConnection.HTTP_OK==resultCode){
      StringBuffer sb=new StringBuffer();
      String readLine=new String();
      BufferedReader responseReader=new BufferedReader(new InputStreamReader(httpConn.getInputStream(),"UTF-8"));
      while((readLine=responseReader.readLine())!=null){
        sb.append(readLine).append("
");
      }
      responseReader.close();
      System.out.println(sb.toString());
    } 
  }
}