HttpURLConnection發送請求

每個 HttpURLConnection 實例都可用於生成單個請求，但是其他實例可以透明地共享連接到 HTTP 服務器的基礎網絡。請求后在 HttpURLConnection 的 InputStream 或 OutputStream 上調用 close() 方法可以釋放與此實例關聯的網絡資源，但對共享的持久連接沒有任何影響。如果在調用 disconnect() 時持久連接空閑，則可能關閉基礎套接字。JAVA使用HttpURLConnection發送POST數據是依靠OutputStream流的形式發送

package com.newflypig.demo;
/**
 * 使用jdk自帶的HttpURLConnection向URL發送POST請求並輸出響應結果
 * 參數使用流傳遞，並且硬編碼為字符串"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");
    //建立連接
    URL url=new URL(urlPath);
    HttpURLConnection httpConn=(HttpURLConnection)url.openConnection();
    //設置參數
    httpConn.setDoOutput(true);   //需要輸出
    httpConn.setDoInput(true);   //需要輸入
    httpConn.setUseCaches(false);  //不允許緩存
    httpConn.setRequestMethod("POST");   //設置POST方式連接
    //設置請求屬性
    httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    httpConn.setRequestProperty("Connection", "Keep-Alive");// 維持長連接
    httpConn.setRequestProperty("Charset", "UTF-8");
    //連接,也可以不用明文connect，使用下面的httpConn.getOutputStream()會自動connect
    httpConn.connect();
    //建立輸入流，向指向的URL傳入參數
    DataOutputStream dos=new DataOutputStream(httpConn.getOutputStream());
    dos.writeBytes(param);
    dos.flush();
    dos.close();
    //獲得響應狀態
    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("\n");
      }
      responseReader.close();
      System.out.println(sb.toString());
    } 
  }
}