麻烦老师帮我看看，找不到方法

java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.imooc.sm.global.DispatcherServlet.service(DispatcherServlet.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.imooc.sm.global.EncodingFilter.doFilter(EncodingFilter.java:19)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoSuchMethodError: com.imooc.sm.dao.StaffDao.selectById(Ljava/lang/Integer;)Lcom/imooc/sm/entity/Staff;
	at com.imooc.sm.service.impl.StaffServiceImpl.get(StaffServiceImpl.java:33)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
	at com.sun.proxy.$Proxy20.get(Unknown Source)
	at com.imooc.sm.controller.StaffController.detail(StaffController.java:117)
	... 30 more

package com.imooc.sm.service.impl;

import com.imooc.sm.dao.StaffDao;
import com.imooc.sm.entity.Staff;
import com.imooc.sm.service.StaffService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Date;
import java.util.List;
@Service("staffService")
public class StaffServiceImpl implements StaffService {
    @Autowired
    private StaffDao staffDao;

    public void add(Staff staff) {
        staff.setPassword("123456");
        staff.setWorkTime(new Date());
        staff.setStatus("正常");
        staffDao.insert(staff);
    }

    public void remove(Integer id) {
        staffDao.delete(id);
    }

    public void edit(Staff staff) {
        staffDao.update(staff);
    }

    public Staff get(Integer id) {
        System.out.println("1111111111");
        return staffDao.selectById(id);
    }

    public List<Staff> getAll() {
        return staffDao.selectAll();
    }
}

package com.imooc.sm.controller;

import com.imooc.sm.entity.Department;
import com.imooc.sm.entity.Staff;
import com.imooc.sm.service.DepartmentService;
import com.imooc.sm.service.StaffService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

@Controller("staffController")
public class StaffController {
    @Autowired
    private StaffService staffService;
    @Autowired
    private DepartmentService departmentService;

    public void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Staff> list = staffService.getAll();
        request.setAttribute("LIST",list);
        request.getRequestDispatcher("../staff_list.jsp").forward(request,response);
    }

    public void toAdd(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Department> list = departmentService.getAll();
        request.setAttribute("DLIST",list);
        request.getRequestDispatcher("../staff_add.jsp").forward(request,response);
    }
    public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String account = request.getParameter("account");
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");
        String idNumber = request.getParameter("idNumber");
        String info =request.getParameter("info");
        Date bornDate=null;
        try {
            bornDate = new SimpleDateFormat("yyyy-MM-dd").parse(request.getParameter("bornDate"));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        Integer did = Integer.parseInt(request.getParameter("did"));

        Staff staff = new Staff();
        staff.setInfo(info);
        staff.setBornDate(bornDate);
        staff.setIdNumber(idNumber);
        staff.setDid(did);
        staff.setAccount(account);
        staff.setName(name);
        staff.setSex(sex);
        /**由于staff是之前数据库中查询出来的，department属性没有修改，只修改了did属性
         * 所以，我们把department根据did属性查询出来并设置给staff的department属性*/
        Department department = departmentService . get(did);
        staff.setDepartment (department);
        //判断一下， 如果当前修改的用户与当前登录的用户是同一个，把修改后的用户放到session 中
//        Staff staff1 = (Staff) request. getSession(). getAttribute("USER");
//        if(staff1. getId().equals(staff.getId())){
//            request.getSession(). setAttribute("USER" ,staff);
//        }
        staffService.add(staff);
        response.sendRedirect("list.do");
    }

    public void toEdit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Integer id = Integer.parseInt(request.getParameter("id"));
        System.out.println(id);
        Staff staff = staffService.get(id);
        System.out.println(staff);
        request.setAttribute("OBJ",staff);
        List<Department> list = departmentService.getAll();
        request.setAttribute("DLIST",list);
        request.getRequestDispatcher("../staff_edit.jsp").forward(request,response);
    }
    public void edit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Integer id = Integer.parseInt(request.getParameter("id"));
        String account = request.getParameter("account");
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");
        String idNumber = request.getParameter("idNumber");
        String info =request.getParameter("info");
        Date bornDate=null;
        try {
            bornDate = new SimpleDateFormat("yyyy-MM-dd").parse(request.getParameter("bornDate"));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        Integer did = Integer.parseInt(request.getParameter("did"));

        Staff staff = staffService.get(id);
        staff.setInfo(info);
        staff.setBornDate(bornDate);
        staff.setIdNumber(idNumber);
        staff.setDid(did);
        staff.setAccount(account);
        staff.setName(name);
        staff.setSex(sex);

        staffService.edit(staff);
        response.sendRedirect("list.do");
    }
    public void remove(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Integer id = Integer.parseInt(request.getParameter("id"));
        staffService.remove(id);
        response.sendRedirect("list.do");
    }

    public void detail(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Integer id = Integer.parseInt(request.getParameter("id"));
        Staff staff = staffService.get(id);
        request.setAttribute("OBJ",staff);
        request.getRequestDispatcher("../staff_detail.jsp").forward(request,response);
    }
}

不停奔跑的小恐龙 2020-01-21

源自：项目：人员管理系统开发 4-5 员工管理实现-界面

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2回答

好帮手慕阿满回答被采纳获得+3积分 2020-01-22 10:43:37

同学你好，检查同学的代码并没有什么问题，建议同学删除target文件，重启项目再试试。

祝：学习愉快~

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提问者不停奔跑的小恐龙 2020-01-21 22:39:17

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.4//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.imooc.sm.dao.StaffDao">
    <resultMap id="resultMap" type="Staff">
        <id property="id" column="id" javaType="Integer"/>
        <result property="account" column="account" javaType="String"/>
        <result property="password" column="password" javaType="String"/>
        <result property="status" column="status" javaType="String"/>
        <result property="did" column="did" javaType="Integer"/>
        <result property="name" column="name" javaType="String"/>
        <result property="sex" column="sex" javaType="String"/>
        <result property="idNumber" column="id_number" javaType="String"/>
        <result property="workTime" column="work_time" javaType="java.util.Date"/>
        <result property="leaveTime" column="leave_time" javaType="java.util.Date"/>
        <result property="bornDate" column="born_date" javaType="java.util.Date"/>
        <result property="info" column="info" javaType="String"/>
        <association property="department" column="did" javaType="Department" select="com.imooc.sm.dao.DepartmentDao.selectById" />
    </resultMap>

    <insert id="insert" parameterType="Staff" useGeneratedKeys="true">
        insert into staff(account,password,status,did,name,sex,id_number,work_time,leave_time,born_date,info)
        values(#{account},#{password},#{status},#{did},#{name},#{sex},#{idNumber},#{workTime},#{leaveTime},#{bornDate},#{info})
    </insert>
    <delete id="delete" parameterType="Integer">
        delete from staff where id=#{id}
    </delete>
    <update id="update" parameterType="Staff">
        update staff set account=#{account},password=#{password},status=#{status},
        did=#{did},name=#{name},sex=#{sex},id_number=#{idNumber},
        work_time=#{workTime},leave_time=#{leaveTime},born_date=#{bornDate},info=#{info} where id=#{id}
    </update>
    <select id="selectById" parameterType="Integer" resultMap="resultMap">
        select * from staff where id=#{id}
    </select>
    <select id="selectAll" resultMap="resultMap">
        select * from staff
    </select>
</mapper>

package com.imooc.sm.dao;

import com.imooc.sm.entity.Staff;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository("staffDao")
public interface StaffDao {
    void insert(Staff staff);

    void delete(Integer id);

    void update(Staff staff);

    Staff selectById(Integer id);

    List<Staff> selectAll();

}

可以获取到前端传来的属性