HttpURLConnection 当作请求调用接口不带返回参数的工具类

package cn.smartercampus.core.util;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class HttpCilent { ???public String httpRequest(String req_url) { ???????StringBuffer buffer = new StringBuffer(); ?????????try { ?????????????URL url = new URL(req_url); ?????????????HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection(); ?????????????httpUrlConn.setDoOutput(false); ?????????????httpUrlConn.setDoInput(true); ?????????????httpUrlConn.setUseCaches(false); ?????????????httpUrlConn.setRequestMethod("GET"); ?????????????httpUrlConn.connect(); ?????????????// 将返回的输入流转换成字符串 ?????????????InputStream inputStream = httpUrlConn.getInputStream(); ?????????????InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8"); ?????????????BufferedReader bufferedReader = new BufferedReader(inputStreamReader); ?????????????String str = null; ?????????????while ((str = bufferedReader.readLine()) != null) { ?????????????????buffer.append(str); ?????????????} ?????????????bufferedReader.close(); ?????????????inputStreamReader.close(); ?????????????// 释放资源 ?????????????inputStream.close(); ?????????????inputStream = null; ?????????????httpUrlConn.disconnect(); ?????????} catch (Exception e) { ?????????????System.out.println(e.getStackTrace()); ?????????} ?????????return buffer.toString(); ?????} ?}