使用HttpURLConnection发请求获取数据

使用HttpURLConnection发请求获取数据

 

参考代码：

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

/
  功能说明：HttpClient - 通过发送Http请求获取目标URL的数据
/
public class HttpClient {

    / 提交方式POST /
    public static final String SUBMIT_METHOD_POST = “POST”;

    / 提交方式GET /
    public static final String SUBMIT_METHOD_GET = “GET”;


    /
      通过http请求获取数据
      @param urlStr    url地址，如：www.baidu.com
      @param param     url的?后的参数，如：www.baidu.com?a=1&&b=2,则param为”a=1&&b=2”
      @return          返回读取到的数据（json字符串）
     /
    public static String pub(String urlStr,String param,String method)
    {
        URL url = null;
        HttpURLConnection connection = null;
        StringBuffer buffer = new StringBuffer();
        System.out.println(”request:”+urlStr+“?”+param);
        try {
            /建立连接/
            url = new URL(urlStr);
            connection = (HttpURLConnection) url.openConnection();

            /设置连接属性 /
            connection.setDoOutput(true);// 使用 URL 连接进行输出
            connection.setDoInput(true);// 使用 URL 连接进行输入
            connection.setUseCaches(false);// 忽略缓存
            connection.setRequestMethod(method);// 设置URL请求方法

            /设置请求属性/
            connection.setRequestProperty(”Content-Length”,param.length()+“”);
            connection.setRequestProperty(”Content-Type”, “application/octet-stream”);
            connection.setRequestProperty(”Connection”, “Keep-Alive”);// 维持长连接
            connection.setRequestProperty(”Charset”, “UTF-8”);// 设置编码

            /建立输出流，并写入数据/
            OutputStream outputStream = connection.getOutputStream();
            outputStream.write(param.getBytes(”UTF-8”));

            /读取数据/
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), “UTF-8”));
            String line = ”“;
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }
        System.out.println(”response:”+buffer.toString());
        return buffer.toString();
    }

    /测试*/
    public static void main(String[] args) {
        pub(”http://f.apiplus.cn/ssq.json”, “a=1”,SUBMIT_METHOD_POST);
    }
}

 

测试结果：