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该文章展示了一个名为TestServlet的JavaServlet实现，它处理HTTP请求并调用TestServiceIMPL来执行数据库操作。Servlet支持findAll和insert方法，用于查询所有记录和插入新的Test对象到数据库。当数据插入成功或失败时，Servlet会更新消息并重定向到test.jsp页面显示结果。

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package com.gs.web.servlet;

import com.gs.web.model.Test;
import com.gs.web.service.TestService;
import com.gs.web.service.TestServiceIMPL;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(value = "/TestServlet")
public class TestServlet extends HttpServlet {
    private TestService testService = new TestServiceIMPL();
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String method = request.getParameter("method");
        if(method.equals("findAll")){
            this.findAll(request,response);
        }else if (method.equals("insert")){
            this.insert(request,response);
        }
    }

    private void insert(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String sage = request.getParameter("age");
        int age = Integer.parseInt(sage);
        String sex = request.getParameter("sex");
        String idCar = request.getParameter("idCar");
        Test test = new Test();
        test.setUsername(username);
        test.setAge(age);
        test.setSex(sex);
        test.setIdCar(idCar);
        boolean flag = testService.insert(test);
        if(flag){
            request.setAttribute("msg","添加成功");
            this.findAll(request,response);
        }else{
            request.setAttribute("msg","添加失败");
            this.findAll(request,response);
        }
    }

    private void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Test> testList = testService.findAll();
        request.setAttribute("testList",testList);
        request.getRequestDispatcher("/test.jsp").forward(request,response);
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}