Не найдено сопоставления для HTTP-запроса с URI [/ MVCCrud/viewemp] в DispatcherServlet с именем 'dispatcher'

Question

Я новичок в SpringFramework, и я пытаюсь создать веб-приложение Spring MVC (используя базу данных). Я получаю эту ошибку из названия, и я не понимаю, почему. Я проверил файлы, и все кажется, что все в порядке. Я добавляю файлы:

EmployeeController.java

package com.javatpoint.controllers; 

import java.util.List; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.ModelAttribute; 
import org.springframework.web.bind.annotation.PathVariable; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.servlet.ModelAndView; 

import com.javatpoint.beans.Employee; 
import com.javatpoint.dao.EmployeeJDBCTemplate; 

@Controller 
public class EmployeeController { 
    @Autowired 
    EmployeeJDBCTemplate jdbcTemplate;//will inject dao from xml file 

    /*It displays a form to input data, here "command" is a reserved request attribute 
    *which is used to display object data into form 
    */ 
    @RequestMapping("/empform") 
    public ModelAndView showform(){ 
     return new ModelAndView("empform","command",new Employee()); 
    } 

     /*It saves object into database. The @ModelAttribute puts request data 
    * into model object. You need to mention RequestMethod.POST method 
    * because default request is GET*/ 
    @RequestMapping(value="/save", method=RequestMethod.POST) 
    public ModelAndView save(@ModelAttribute("emp") Employee employee){ 
     jdbcTemplate.save(employee); 
     return new ModelAndView("redirect:/viewmap"); //will redirect to viewmap request mappeing 
    } 

    /* It provides list of employees in model object */ 
    @RequestMapping("/viewmap") 
    public ModelAndView viewmap(){ 
     List<Employee> list = jdbcTemplate.getEmployees(); 
     return new ModelAndView("viewmap","list",list); 
    } 

    /* It displays object data into form for the given id. 
    * The @PathVariable puts URL data into variable.*/ 
    @RequestMapping(value="/editemp/{id}") 
    public ModelAndView edit(@PathVariable int id){ 
     Employee employee = jdbcTemplate.getEmployee(id); 
     return new ModelAndView("empeditform","command",employee); 
    } 

    /* It updates model object. */ 
    @RequestMapping(value="/editsave",method=RequestMethod.POST) 
    public ModelAndView editsave(@ModelAttribute("emp") Employee employee){ 
     jdbcTemplate.update(employee); 
     return new ModelAndView("redirect:/viewemp"); 
    } 

    /* It deletes record for the given id in URL and redirects to /viewemp */ 
    @RequestMapping(value="/deleteemp/{id}",method = RequestMethod.GET) 
    public ModelAndView delete(@PathVariable int id){ 
     jdbcTemplate.delete(id); 
     return new ModelAndView("redirect:/viewemp"); 
    } 
} 

EmployeeJDBCTemplate.java

package com.javatpoint.dao; 

import java.util.List; 

import javax.sql.DataSource; 

import org.springframework.jdbc.core.JdbcTemplate; 

import com.javatpoint.beans.Employee; 

public class EmployeeJDBCTemplate implements EmployeeDao{ 
    private DataSource dataSource; 
    private JdbcTemplate jdbcTemplateObject; 

    @Override 
    public void setDataSource(DataSource dataSource) { 
     this.dataSource = dataSource; 
     this.jdbcTemplateObject = new JdbcTemplate(dataSource); 
    } 


    @Override 
    public void save(Employee employee) { 
     String SQL = "insert into emp99 (id,name,salary,designation) values (?,?,?,?)"; 
     jdbcTemplateObject.update(SQL,employee.getId(),employee.getName(),employee.getSalary(),employee.getDesignation()); 

    } 

    @Override 
    public void update(Employee employee) { 
     String SQL = "update emp99 set name=?, salary=?, designation=? where id=?"; 
     jdbcTemplateObject.update(SQL,employee.getName(),employee.getSalary(),employee.getDesignation(),employee.getId()); 

    } 

    @Override 
    public void delete(int id) { 
     String SQL = "delete from emp99 where id=?"; 
     jdbcTemplateObject.update(SQL,id); 

    } 

    @Override 
    public Employee getEmployee(int id) { 
     String SQL = "select * from emp99 where id=?"; 
     Employee employee = jdbcTemplateObject.queryForObject(SQL, new Object[]{id}, new EmployeeMapper()); 
     return employee; 
    } 

    @Override 
    public List<Employee> getEmployees() { 
     String SQL = "select * from emp99"; 
     List<Employee> employees = jdbcTemplateObject.query(SQL, new EmployeeMapper()); 
     return employees; 
    } 
} 

диспетчерскую-servlet.xml

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans  
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd  
http://www.springframework.org/schema/context  
http://www.springframework.org/schema/context/spring-context-4.2.xsd"> 

    <context:component-scan base-package="com.javatpoint.controllers"/> 
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <property name="prefix" value="/WEB-INF/jsp/"/> 
     <property name="suffix" value=".jsp"/> 
    </bean> 

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
     <property name="driverClassName" value="com.mysql.jdbc.Driver"/> 
     <property name="url" value="jdbc:mysql://localhost:3306/jdbc_test"/> 
     <property name="username" value="aaaa"/> 
     <property name="password" value="1234"/> 
    </bean> 

    <bean id="jdbcTemplate" class="com.javatpoint.dao.EmployeeJDBCTemplate"> 
     <property name="dataSource" ref="dataSource"/> 
    </bean> 

</beans> 

web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 

     <servlet> 
      <servlet-name>dispatcher</servlet-name> 
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
      <load-on-startup>1</load-on-startup> 
     </servlet> 
     <servlet-mapping> 
      <servlet-name>dispatcher</servlet-name> 
      <url-pattern>/</url-pattern> 
     </servlet-mapping> 
</web-app> 

Я добавляю фото со структурой файлов тоже.

Answer 1

Ваш недостаток <mvc:annotation-driven /> в вашем диспетчере-servlet.xml, чтобы сообщить весне, чтобы использовать аннотации.

Пространство имен xmlns:mvc="http://www.springframework.org/schema/mvc" и URL SchemaLocation http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd