Java发送HTTP的POST请求详解编程语言

 
 
import java.io.BufferedReader; 
 
import java.io.InputStreamReader; 
 
import java.io.OutputStreamWriter; 
 
import java.net.HttpURLConnection; 
 
import java.net.URL; 
 
import java.util.Map; 
 
import java.util.Map.Entry; 
 
  
 
/** 
 
 * @author yoUng 
 
 * @description 发送http请求 
 
 * @filename HttpUtil.java 
 
 * @time 2011-6-15 下午05:26:36 
 
 * @version 1.0 
 
 */ 
 
public class HttpUtil { 
 
  
 
public static String http(String url, Map<String, String> params) { 
 
URL u = null; 
 
HttpURLConnection con = null; 
 
//构建请求参数 
 
StringBuffer sb = new StringBuffer(); 
 
if(params!=null){ 
 
for (Entry<String, String> e : params.entrySet()) { 
 
sb.append(e.getKey()); 
 
sb.append("="); 
 
sb.append(e.getValue()); 
 
sb.append("&"); 
 
} 
 
sb.substring(0, sb.length() - 1); 
 
} 
 
System.out.println("send_url:"+url); 
 
System.out.println("send_data:"+sb.toString()); 
 
//尝试发送请求 
 
try { 
 
u = new URL(url); 
 
con = (HttpURLConnection) u.openConnection(); 
 
con.setRequestMethod("POST"); 
 
con.setDoOutput(true); 
 
con.setDoInput(true); 
 
con.setUseCaches(false); 
 
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
 
OutputStreamWriter osw = new OutputStreamWriter(con.getOutputStream(), "UTF-8"); 
 
osw.write(sb.toString()); 
 
osw.flush(); 
 
osw.close(); 
 
} catch (Exception e) { 
 
e.printStackTrace(); 
 
} finally { 
 
if (con != null) { 
 
con.disconnect(); 
 
} 
 
} 
 
  
 
//读取返回内容 
 
StringBuffer buffer = new StringBuffer(); 
 
try { 
 
BufferedReader br = new BufferedReader(new InputStreamReader(con 
 
.getInputStream(), "UTF-8")); 
 
String temp; 
 
while ((temp = br.readLine()) != null) { 
 
buffer.append(temp); 
 
buffer.append("/n"); 
 
} 
 
} catch (Exception e) { 
 
e.printStackTrace(); 
 
} 
 
  
 
return buffer.toString(); 
 
} 
 
  
 
}