项目开发中难免遇到外部接口的调用,小生今天初次接触该类,跟着API方法走了一遍,如有不对的地方,还请哆哆指正,拜谢!

 1 package com.cplatform.movie.back.test;  2   3 import java.io.BufferedReader;  4 import java.io.DataOutputStream;  5 import java.io.InputStreamReader;  6 import java.net.HttpURLConnection;  7 import java.net.URL;  8 import java.net.URLEncoder;  9  10  11  12 public class HttpURLConnectionTest { 13     public static final String GET_URL = "http://112.4.27.9/mall-back/if_user/store_list?storeId=32"; 14     public static final String POST_URL = "http://112.4.27.9/mall-back/if_user/store_list"; 15      16     /** 17      * 接口调用 GET 18      */ 19     public static void httpURLConectionGET() { 20         try { 21             URL url = new URL(GET_URL);    // 把字符串转换为URL请求地址 22             HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接 23             connection.connect();// 连接会话 24             // 获取输入流 25             BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream())); 26             String line; 27             StringBuilder sb = new StringBuilder(); 28             while ((line = br.readLine()) != null) {// 循环读取流 29                 sb.append(line); 30             } 31             br.close();// 关闭流 32             connection.disconnect();// 断开连接 33             System.out.println(sb.toString()); 34         } catch (Exception e) { 35             e.printStackTrace(); 36             System.out.println("失败!"); 37         } 38     } 39      40     /** 41      * 接口调用  POST 42      */ 43     public static void httpURLConnectionPOST () { 44         try { 45             URL url = new URL(POST_URL); 46              47             // 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) 48             HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此时cnnection只是为一个连接对象,待连接中 49              50             // 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) 51             connection.setDoOutput(true); 52              53             // 设置连接输入流为true 54             connection.setDoInput(true); 55              56             // 设置请求方式为post 57             connection.setRequestMethod("POST"); 58              59             // post请求缓存设为false 60             connection.setUseCaches(false); 61              62             // 设置该HttpURLConnection实例是否自动执行重定向 63             connection.setInstanceFollowRedirects(true); 64              65             // 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) 66             // application/x-javascript text/xml->xml数据 application/x-javascript->json对象 application/x-www-form-urlencoded->表单数据 67             connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 68              69             // 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) 70             connection.connect(); 71              72             // 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) 73             DataOutputStream dataout = new DataOutputStream(connection.getOutputStream()); 74             String parm = "storeId=" + URLEncoder.encode("32", "utf-8"); //URLEncoder.encode()方法  为字符串进行编码 75              76             // 将参数输出到连接 77             dataout.writeBytes(parm); 78              79             // 输出完成后刷新并关闭流 80             dataout.flush(); 81             dataout.close(); // 重要且易忽略步骤 (关闭流,切记!)  82              83             System.out.println(connection.getResponseCode()); 84              85             // 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) 86             BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream()));  87             String line; 88             StringBuilder sb = new StringBuilder(); // 用来存储响应数据 89              90             // 循环读取流,若不到结尾处 91             while ((line = bf.readLine()) != null) { 92                 sb.append(bf.readLine()); 93             } 94             bf.close();    // 重要且易忽略步骤 (关闭流,切记!)  95             connection.disconnect(); // 销毁连接 96             System.out.println(sb.toString()); 97      98         } catch (Exception e) { 99             e.printStackTrace();100         }101     }102     103     104     public static void main(String[] args) {105 //        httpURLConectionGET();106         httpURLConnectionPOST();107     }108 }