Java发送HTTP的POST请求

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 Bert

 * @description 发送http请求

 * @filename HttpUtil.java

 * @time 2012-6-15 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();

}

 

}