java后台调用HttpURLConnection类模拟浏览器请求实例(可用于接口调用)

一般在项目开发中难免遇到外部接口的调用,本文实例讲述了java后台调用HttpURLConnection类模拟浏览器请求的方法。可用于接口调用。分享给大家供大家参考。具体实现方法如下：

package com.cplatform.movie.back.test;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;
public class HttpURLConnectionTest {

    public static final String GET_URL = "http://112.4.27.9/mall-back/if_user/store_list?storeId=32";

    public static final String POST_URL = "http://112.4.27.9/mall-back/if_user/store_list";

    

    /**

     * 接口调用 GET

     */

    public static void httpURLConectionGET() {

        try {

            URL url = new URL(GET_URL);    // 把字符串转换为URL请求地址

            HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接

            connection.connect();// 连接会话

            // 获取输入流

            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));

            String line;

            StringBuilder sb = new StringBuilder();

            while ((line = br.readLine()) != null) {// 循环读取流

                sb.append(line);

            }

            br.close();// 关闭流

            connection.disconnect();// 断开连接

            System.out.println(sb.toString());

        } catch (Exception e) {

            e.printStackTrace();

            System.out.println("失败!");

        }

    }

    

    /**

     * 接口调用  POST

     */

    public static void httpURLConnectionPOST () {

        try {

            URL url = new URL(POST_URL);

            

            // 将url 以 open方法返回的urlConnection  连接强转为HttpURLConnection连接  (标识一个url所引用的远程对象连接)

            HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此时cnnection只是为一个连接对象,待连接中

            

            // 设置连接输出流为true,默认false (post 请求是以流的方式隐式的传递参数)

            connection.setDoOutput(true);

            

            // 设置连接输入流为true

            connection.setDoInput(true);

            

            // 设置请求方式为post

            connection.setRequestMethod("POST");

            

            // post请求缓存设为false

            connection.setUseCaches(false);

            

            // 设置该HttpURLConnection实例是否自动执行重定向

            connection.setInstanceFollowRedirects(true);

            

            // 设置请求头里面的各个属性 (以下为设置内容的类型,设置为经过urlEncoded编码过的from参数)

            // application/x-javascript text/xml->xml数据 application/x-javascript->json对象 application/x-www-form-urlencoded->表单数据

            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            

            // 建立连接 (请求未开始,直到connection.getInputStream()方法调用时才发起,以上各个参数设置需在此方法之前进行)

            connection.connect();

            

            // 创建输入输出流,用于往连接里面输出携带的参数,(输出内容为?后面的内容)

            DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());

            String parm = "storeId=" + URLEncoder.encode("32", "utf-8"); //URLEncoder.encode()方法  为字符串进行编码

            

            // 将参数输出到连接

            dataout.writeBytes(parm);

            

            // 输出完成后刷新并关闭流

            dataout.flush();

            dataout.close(); // 重要且易忽略步骤 (关闭流,切记!) 

            

            System.out.println(connection.getResponseCode());

            

            // 连接发起请求,处理服务器响应  (从连接获取到输入流并包装为bufferedReader)

            BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream())); 

            String line;

            StringBuilder sb = new StringBuilder(); // 用来存储响应数据

            

            // 循环读取流,若不到结尾处

            while ((line = bf.readLine()) != null) {

                sb.append(bf.readLine());

            }

            bf.close();    // 重要且易忽略步骤 (关闭流,切记!) 

            connection.disconnect(); // 销毁连接

            System.out.println(sb.toString());

    

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    

    public static void main(String[] args) {

//        httpURLConectionGET();

        httpURLConnectionPOST();

    }

}

希望本文所述对大家的Java程序设计有所帮助。