Android通过POST方式传递数据到服务器简单demo

落日映苍穹つ 2022-08-05 14:20 186阅读 0赞

通过Post方式传递数据给服务器是Android应用程序中的开发提交数据给服务器的一种主要方式，适用于数据量大、数据类型复杂、数据安全要求比较高的场合。  
服务器端代码，该处主要编写doGet方法既可：

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("/ServletForPOSTMethod")
    public class ServletForPOSTMethod extends HttpServlet {
        
        private static final long serialVersionUID = 1L;
    
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
        }
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            String name= request.getParameter("name");
            String age= request.getParameter("age");
            System.out.println("name from POST method: " + name );
            System.out.println("age from POST method: " + age );
        }
    
    }

客户端代码：  
业务逻辑代码：

package com.wangjialin.internet.userInformation.service;
    
    import java.io.OutputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLEncoder;
    import java.util.HashMap;
    import java.util.Map;
    
    public class UploadUserInformationByPostService {
        
        public static boolean save(String title, String length) throws Exception{
            String path = "http://192.168.1.100:8080/ServerForPOSTMethod/ServletForPOSTMethod";
            Map<String, String> params = new HashMap<String, String>();
            params.put("name", title);
            params.put("age", length);
            return sendPOSTRequest(path, params, "UTF-8");
        }
    
        /**
         * 发送POST请求
         * @param path 请求路径
         * @param params 请求参数
         * @return
         */
        private static boolean sendPOSTRequest(String path, Map<String, String> params, String encoding) throws Exception{
            //  title=liming&length=30
            StringBuilder sb = new StringBuilder();
            if(params!=null && !params.isEmpty()){
                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);
            }
            byte[] data = sb.toString().getBytes();
    
            HttpURLConnection conn = (HttpURLConnection) new URL(path).openConnection();
            conn.setConnectTimeout(5000);
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);//允许对外传输数据
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("Content-Length", data.length+"");
            OutputStream outStream = conn.getOutputStream();
            outStream.write(data);
            outStream.flush();
            if(conn.getResponseCode() == 200){
                return true;
            }
            return false;
        }
    }