java代码调用http接口简单例子(实测可用)

package Mytest.model.test;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class HttpDemo {
public static void main(String[] args) throws Exception {
//请求的webservice的url
URL url = new URL("http://www.longwenyun.com/lwSystem/user/getUserInfo.action");
//创建http链接
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

//设置请求的方法类型
httpURLConnection.setRequestMethod("POST");

//设置请求的内容类型
httpURLConnection.setRequestProperty("Content-type", "application/x-www-form-urlencoded");

//设置发送数据
httpURLConnection.setDoOutput(true);
//设置接受数据
httpURLConnection.setDoInput(true);

//发送数据,使用输出流
OutputStream outputStream = httpURLConnection.getOutputStream();
//发送的soap协议的数据
String content = "user_id="+ URLEncoder.encode("13846", "gbk");

//发送数据
outputStream.write(content.getBytes());

//接收数据

4000
InputStream inputStream = httpURLConnection.getInputStream();

//定义字节数组
byte[] b = new byte[1024];

//定义一个输出流存储接收到的数据
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

//开始接收数据
int len = 0;
while (true) {
len = inputStream.read(b);
if (len == -1) {
//数据读完
break;
}
byteArrayOutputStream.write(b, 0, len);
}
//从输出流中获取读取到数据(服务端返回的)
String response = byteArrayOutputStream.toString();

System.out.println(response);
}
}