http接口的学习（暂时只是记录，测试之后重新更新）

链接1：https://blog.csdn.net/java173842219/article/details/54020168

链接2：https://blog.csdn.net/u011320740/article/details/53537484

再添加点代码

package jishuqi;
 
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 DemoTest {
    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";
    // 妙兜测试接口
    public static final String POST_URL = "http://121.40.204.191:8180/mdserver/service/installLock";
 
    /**
     * 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(), "UTF-8"));
            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
            // ;charset=utf-8 必须要，不然妙兜那边会出现乱码【★★★★★】
            connection.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded;charset=utf-8");
            // 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 app_key = "app_key="
                    + URLEncoder.encode("4f7bf8c8260124e6e9c6bf094951a111",
                            "utf-8"); // 已修改【改为错误数据，以免信息泄露】
            String agt_num = "&agt_num=" + URLEncoder.encode("10111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
            String pid = "&pid=" + URLEncoder.encode("BLZXA150401111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
            String departid = "&departid="
                    + URLEncoder.encode("10007111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
            String install_lock_name = "&install_lock_name="
                    + URLEncoder.encode("南天大门", "utf-8");
            String install_address = "&install_address="
                    + URLEncoder.encode("北京育新", "utf-8");
            String install_gps = "&install_gps="
                    + URLEncoder.encode("116.350888,40.011001", "utf-8");
            String install_work = "&install_work="
                    + URLEncoder.encode("小李", "utf-8");
            String install_telete = "&install_telete="
                    + URLEncoder.encode("13000000000", "utf-8");
            String intall_comm = "&intall_comm="
                    + URLEncoder.encode("一切正常", "utf-8");
            // 格式 parm = aaa=111&bbb=222&ccc=333&ddd=444
            String parm = app_key + agt_num + pid + departid
                    + install_lock_name + install_address + install_gps
                    + install_work + install_telete + intall_comm;
            // 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(), "UTF-8"));
            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());
                sb.append(line).append(System.getProperty("line.separator"));
            }
            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();
    }
}