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

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这篇文章主要介绍了Java后台调用HttpURLConnection类模拟浏览器请求实例,该实例可用于接口调用,具有一定的实用价值,需要的朋友可以参考下

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：

<span style="font-size:14px;">package com.cntv.service.serviceImpl;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";                //public static final String POST_URL = "http://www.yodao.com/smartresult-xml/search.s?type=id&q=513721199511287976";                /**       * 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();        }    }   </span>

===================================>下面负责代码在文本中

package com.cntv.service.serviceImpl;
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";

// public static final String POST_URL = "http://www.yodao.com/smartresult-xml/search.s?type=id&q=513721199511287976";

/**

* 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();

}

}

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