通过GET方式传递数据到服务器

妖狐艹你老母 2022-08-05 14:20 180阅读 0赞

服务器端代码：

package com.wangjialin.internet.servlet;
    
    import java.io.IOException;
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    
    @WebServlet("/ServletForGETMethod")
    public class ServletForGETMethod extends HttpServlet {
        
        private static final long serialVersionUID = 1L;
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                String name= request.getParameter("name");
    //          String name= new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8");
                String age= request.getParameter("age");
                System.out.println("name: " + name );
                System.out.println("age: " + age );
    
        }
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
        }
    
    }

同时服务器端也要在web.xml文件中配置一些文件：  
要把以下代码加入到web.xml 文件中

<servlet>
        <display-name>ServletForGETMethod</display-name>
        <servlet-name>ServletForGETMethod</servlet-name>
        <servlet-class>com.wangjialin.internet.servlet.ServletForGETMethod</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>ServletForGETMethod</servlet-name>
        <url-pattern>/ServletForGETMethod</url-pattern>
      </servlet-mapping>

Android客户端的业务逻辑类是：

package com.wangjialin.internet.userInformation.service;
    
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLEncoder;
    import java.util.HashMap;
    import java.util.Map;
    
    public class UserInformationService {
        
        public static boolean save(String title, String length) throws Exception{
            String path = "http://192.168.1.100:8080/ServerForGETMethod/ServletForGETMethod";
            Map<String, String> params = new HashMap<String, String>();
            params.put("name", title);
            params.put("age", length);
            return sendGETRequest(path, params, "UTF-8");
        }
    
    
    
        /**
         * 发送GET请求
         * @param path 请求路径
         * @param params 请求参数
         * @return
         */
        private static boolean sendGETRequest(String path, Map<String, String> params, String encoding) throws Exception{
            // http://192.178.1.100:8080/ServerForGETMethod/ServletForGETMethod?title=xxxx&length=90
            StringBuilder sb = new StringBuilder(path);
            if(params!=null && !params.isEmpty()){
                sb.append("?");
                for(Map.Entry<String, String> entry : params.entrySet()){
                    sb.append(entry.getKey()).append("=");
                    sb.append(URLEncoder.encode(entry.getValue(), encoding));
                    sb.append("&");
                }
                sb.deleteCharAt(sb.length() - 1);
            }
            HttpURLConnection conn = (HttpURLConnection) new URL(sb.toString()).openConnection();
            conn.setConnectTimeout(5000);
            conn.setRequestMethod("GET");
            if(conn.getResponseCode() == 200){
                return true;
            }
            return false;
        }
    }

同时Android客户端的代码也要在AndroidManifest.xml中配置一下：  
要有访问网络的权限设置:

服务器端控制台上的数据可能出现乱码：  
这个时候要修改一些：  
要对获取的字符串加上一句：  
String name= new String(request.getParameter(“name”).getBytes(“ISO8859-1”),”UTF-8”);

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GET适用用数据量小于2KB并且安全性不是很高的情况下的适用！