Java發送HTTP的POST請求

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 yoUng

@description 發送http請求

@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;
//構建請求參數
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());
//嘗試發送請求
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();
}
}
//讀取返回內容
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();
}
}
</pre>