java后端通过url请求第三方（远程）接口服务（GET || POST）

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSONObject;

 //GET请求
public static String sendGet(String url, String param) {
	String result = "";
	BufferedReader in = null;
	try {
		String urlP = url + "?" + param;//拼接url
		URL realUrl = new URL(urlP);
		// 打开和URL之间的连接
		URLConnection connection = realUrl.openConnection();
		// 设置通用的请求属性
		connection.setRequestProperty("accept", "*/*");
		connection.setRequestProperty("connection", "Keep-Alive");
		connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
		// 建立实际的连接
		connection.connect();
		// 获取所有响应头字段
		Map> map = connection.getHeaderFields();
		// 定义 BufferedReader输入流来读取URL的响应
		in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String line;
		while ((line = in.readLine()) != null) {
			result += line;
		}
	} catch (Exception e) {
		System.out.println("发送GET请求出现异常！" + e);
		e.printStackTrace();
	}
	// 使用finally块来关闭输入流
	finally {
		try {
			if (in != null) {
				in.close();
			}
		} catch (Exception e2) {
			e2.printStackTrace();
		}
	}
	return result;
}

  //POST请求
  public static String sendPost(String url, String param) {
  PrintWriter out = null;
  BufferedReader in = null;
  String result = "";
  try {
      URL realUrl = new URL(url);
      // 打开和URL之间的连接
      URLConnection conn = realUrl.openConnection();
      // 设置通用的请求属性
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("user-agent",
              "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
      // 发送POST请求必须设置如下两行
      conn.setDoOutput(true);
      conn.setDoInput(true);
      // 获取URLConnection对象对应的输出流
      out = new PrintWriter(conn.getOutputStream());
      // 发送请求参数
      out.print(param);
      // flush输出流的缓冲
      out.flush();
      // 定义BufferedReader输入流来读取URL的响应
      in = new BufferedReader(
              new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
          result += line;
      }
  } catch (Exception e) {
      System.out.println("发送 POST 请求出现异常！" + e);
      e.printStackTrace();
  }
  // 使用finally块来关闭输出流、输入流
  finally {
      try {
          if (out != null) {
              out.close();
          }
          if (in != null) {
              in.close();
          }
      } catch (IOException ex) {
          ex.printStackTrace();
      }
  }
  return result;

}
}