urlconnection代码

package com.yucheng.connection;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class TestConnection {
	public static void main(String[] args) {

		/**
		 * 作为客户端，先向服务器发送数据，再从接受服务器返回的数据
		 */
		try {
			// 1.打开连接设置各种参数
			URL url = new URL("http://www.xxx.com:8080/crw/service/webserviceprovider");
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			// 设置请求方法，这是HttpURLConnection实现类的方法
			conn.setRequestMethod("POST");
			// 设置http请求头
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "keep-Alive");
			conn.setRequestProperty("content-type", "text/xml;charset=UTF-8");
			// URLConnection可用于输出和输入
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 请求超时时间
			conn.setConnectTimeout(3000);

			// 2.客户端向服务器发送数据
			OutputStream out = conn.getOutputStream();
			out.write("ssskkk".getBytes()); // 在服务器用io接收参数为字节数组 String str = new String(bytes[] b,"utf-8");
			out.flush();
			// 3.接收服务器返回的数据
			InputStream in = conn.getInputStream();
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
			StringBuilder sb = new StringBuilder();
			String line = null;
			while ((line = br.readLine()) != null) {
				sb.append(line);
			}
			String returnMsg = sb.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}