需求：

1.显示所有员工信息：URI：emps ;请求方式：GET

显示效果：

2.添加所有员工：

>1.显示添加页面：URI：emp；请求方式：GET

显示效果：

>2.添加员工信息后的页面：URI：emp；请求方式：POST

显示效果：完成添加，重定向到list页面

3.删除操作：URI：emp/{id}；请求方式：DELETE

删除后效果：对应记录从数据表中删除

4.修改操作（lastName不可修改）：

>1.显示修改页面：URI：emp/{id}；请求方式：GET

显示效果：

>2.修改员工信息：URI:emp;请求方式：PUT

显示效果：完成修改，重定向到list页面

相关类：

>实体类：Employee、Department

>Handler：EmployeeHandler

>Dao:EmployeeDao、DepartmentDao

相关页面：list.jsp、input.jsp、edit.jsp

这个小项目我们使用静态数据，没有连接数据库。

1.导入jar包

-commons-logging-x.x.jar

-jstl.jar

-standard.jar

-spring-aop-x.x.x.RELEASE.jar

-spring-beans-x.x.x.RELESE.jar

-spring-context-x.x.x.RELESE.jar

-spring-core-x.x.x.RELESE.jar

-spring-expression-x.x.x.RELESE.jar

-spring-web-x.x.x.RELESE.jar

-spring-webmvc-x.x.x.RELESE.jar

配置web.xml

    
    		
     	
     	
     		
      
       springDispatcherServlet
      		
      
       org.springframework.web.servlet.DispatcherServlet
      		
      			
       
        contextConfigLocation
       			
       
        classpath:springmvc.xml
       		
      		
      
       1
      	
     	
     	
     		
      
       springDispatcherServlet
      		
      
       /
      	
     		
     	
     		
      
       HiddenHttpMethodFilter
      		
      
       org.springframework.web.filter.HiddenHttpMethodFilter
      	
     	
     		
      
       HiddenHttpMethodFilter
      		
      
       /*
      	
     	
    

在src下新建springmvc.xml

新建com.f145a.springmvc.crud.enties,在包下新建Department.java和Employee.java

Department.java

package com.f145a.springmvc.crud.enties;public class Department {	private Integer id;	private String departmentName;		public Integer getId() {		return id;	}	public void setId(Integer id) {		this.id = id;	}	public String getDepartmentName() {		return departmentName;	}	public void setDepartmentName(String departmentName) {		this.departmentName = departmentName;	}		public Department(int id, String departmentName) {		super();		this.id = id;		this.departmentName = departmentName;	}	public Department() {		// TODO Auto-generated constructor stub	}	}

Employee.java

package com.f145a.springmvc.crud.enties;import java.util.Date;public class Employee {	private Integer id;	private String lastName;	private String email;	private Integer gender;	private Department department;	public Integer getId() {		return id;	}	public void setId(Integer id) {		this.id = id;	}	public String getLastName() {		return lastName;	}	public void setLastName(String lastName) {		this.lastName = lastName;	}	public String getEmail() {		return email;	}	public void setEmail(String email) {		this.email = email;	}	public Integer getGender() {		return gender;	}	public void setGender(Integer gender) {		this.gender = gender;	}	public Department getDepartment() {		return department;	}	public void setDepartment(Department department) {		this.department = department;	}		@Override	public String toString() {		return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender				+ ", department=" + department + "]";	}	public Employee(Integer id, String lastName, String email, Integer gender, Department department) {		super();		this.id = id;		this.lastName = lastName;		this.email = email;		this.gender = gender;		this.department = department;	}	public Employee() {			}}

新建com.f145a.springmvc.crud.dao,在包下新建DepartmentDao.java和EmployeeDao.java

DepartmentDao.java

package com.f145a.springmvc.crud.dao;import java.util.Collection;import java.util.HashMap;import org.springframework.stereotype.Repository;import com.f145a.springmvc.crud.enties.Department;@Repositorypublic class DepartmentDao {	private static HashMap
    
      departments=null;		static{		departments=new HashMap
     
      ();		departments.put(101, new Department(101,"D-AA"));		departments.put(102, new Department(102,"D-BB"));		departments.put(103, new Department(103,"D-CC"));		departments.put(104, new Department(104,"D-DD"));		departments.put(105, new Department(105,"D-EE"));	}		public Collection
      
        getDepartments(){		return departments.values();	}		public Department getDepartment(Integer id){		return departments.get(id);	}	}
      
     
    

EmployeeDao.java

package com.f145a.springmvc.crud.dao;import java.util.Collection;import java.util.Date;import java.util.HashMap;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Repository;import com.f145a.springmvc.crud.enties.Department;import com.f145a.springmvc.crud.enties.Employee;@Repositorypublic class EmployeeDao {	private static Map
    
      employees=null;		@Autowired	private DepartmentDao departmentDao;		static{		employees=new HashMap
     
      ();		employees.put(1001, new Employee(1001,"E-AA","aa@qq.com",1,new Department(101,"D-AA")));		employees.put(1002, new Employee(1002,"E-BB","bb@qq.com",1,new Department(102,"D-BB")));		employees.put(1003, new Employee(1003,"E-CC","cc@qq.com",0,new Department(103,"D-CC")));		employees.put(1004, new Employee(1004,"E-DD","dd@qq.com",0,new Department(104,"D-DD")));		employees.put(1005, new Employee(1005,"E-EE","ee@qq.com",1,new Department(105,"D-EE")));	}		private static Integer initId=1006;		public void save(Employee employee){		if(employee.getId()==null){			employee.setId(initId++);		}		employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));		employees.put(employee.getId(),employee);	}		public Collection
      
        getAll(){		return employees.values();	}		public Employee get(Integer id){		return employees.get(id);	}		public void delete(Integer id){		employees.remove(id);	}}
      
     
    

新建com.f145a.springmvc.crud.handler,在包下新建DepartmentDao.java和EmployeeHandler.java

package com.f145a.springmvc.crud.handlers;import java.util.Map;import javax.websocket.server.PathParam;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.bind.annotation.RequestParam;import com.f145a.springmvc.crud.dao.DepartmentDao;import com.f145a.springmvc.crud.dao.EmployeeDao;import com.f145a.springmvc.crud.enties.Employee;@Controllerpublic class EmployeeHandler {	@Autowired	public EmployeeDao employeeDao;		@Autowired	private DepartmentDao departmentDao;		@ModelAttribute	public void getEmployee(@RequestParam(value="id",required=false) Integer id,			Map 
    
      map){		if(id!=null){			map.put("employee", employeeDao.get(id));		}	}		@RequestMapping(value="/emp",method=RequestMethod.PUT)	public String update(Employee employee){		employeeDao.save(employee);		return "redirect:/emps";	}		@RequestMapping(value="/emp/{id}",method=RequestMethod.GET)	public String input(@PathVariable("id") Integer id,Map
     
       map){		map.put("employee", employeeDao.get(id));		map.put("departments", departmentDao.getDepartments());		return "input";	}		@RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)	public String delete(@PathVariable("id") Integer id){		employeeDao.delete(id);		return "redirect:/emps";	}		@RequestMapping(value="/emp",method=RequestMethod.POST)	public String save(Employee employee){		employeeDao.save(employee);		return "redirect:/emps";	}		@RequestMapping(value="emp",method=RequestMethod.GET)	public String input(Map
      
        map){		map.put("departments", departmentDao.getDepartments());		map.put("employee", new Employee());		return "input";	}		@RequestMapping("/emps")	public String list(Map
       
         map){		map.put("employees",employeeDao.getAll());		return "list";	}}
       
      
     
    

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