SpringMVC学习笔记-REST风格CRUD-白红宇

SpringMVC学习笔记-REST风格CRUD

阅读量：6180 次

发布时间：2019-06-21

本文共 6577 字，大约阅读时间需要 21 分钟。

需求：在首页点击链接显示全部employee信息，点击edit和delete分别进行修改和删除操作，点击add进行添加操作。CRUD分别对应post get put delete四种请求。

目录结构如图

web.xml配置


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

springmvc.xml配置

Department.java

public class Department {	private Integer id;	private String departmentName;	//...}

Employee.java

public class Employee {	private Integer id;	private String lastName;	private String email;	private Integer gender;	//1 male   0 female	private Department department;	//...}

-----------------------------------------------------------------------

DepartmenDao.java

@Repositorypublic class DepartmenDao {//模拟数据库操作	private static  Map
     
       departments = null;	static{		departments = new HashMap
      
       ();		departments.put(1, new Department(1, "D-AA1"));		departments.put(2, new Department(2, "D-AA2"));		departments.put(3, new Department(3, "D-AA3"));		departments.put(4, new Department(4, "D-AA4"));		departments.put(5, new Department(5, "D-AA5"));	}		public Collection
       
         getDepartments(){		return departments.values();	}		public Department getDepartment(Integer id) {		return departments.get(id);	}}

EmployeeDao.java

@Repositorypublic class EmployeeDao {//模拟数据库操作	private static  Map
     
       employees = null;		@Autowired	private DepartmenDao departmenDao;	static{		employees = new HashMap
      
       ();		employees.put(1, new Employee(1, "E-AA1", "1@126.com", 0, new Department(1,"D-AA1")));		employees.put(2, new Employee(2, "E-AA2", "2@126.com", 1, new Department(1,"D-AA1")));		employees.put(3, new Employee(3, "E-AA3", "3@126.com", 0, new Department(2,"D-AA2")));		employees.put(4, new Employee(4, "E-AA4", "4@126.com", 0, new Department(3,"D-AA3")));		employees.put(5, new Employee(5, "E-AA5", "5@126.com", 1, new Department(1,"D-AA1")));	}		private static Integer initId = 1;	public void save(Employee employee) {		if (employee.getId() == null) {//insert or update			employee.setId(initId++);		}		employee.setDepartment(departmenDao.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);	}}

EmployeeHandler.java 处理http请求

@Controllerpublic class EmployeeHandler {	@Autowired	private EmployeeDao employeeDao;	@Autowired	private DepartmenDao departmenDao;		@ModelAttribute	public void getEmployee(@RequestParam(value="id", required=false) Integer id, Map
     
       map) {		if (id != null) {//修改操作			map.put("employee", employeeDao.get(id));		}	}		@RequestMapping("/emps")   //对应index.jsp的链接请求	public String list(Map
      
       map) {//		System.out.println(employeeDao.getAll());		map.put("employees", employeeDao.getAll());		return "list";//list.jsp	}		//add操作	@RequestMapping(value="/emp", method=RequestMethod.GET)	public String input(Map
       
         map) {		map.put("departments", departmenDao.getDepartments());		//默认要进行表单回显，所以这里要放一个employee到map里面，		//对应input.jsp中的modelAttribute="employee"		map.put("employee", new Employee());//input.jsp line17		return "input";	}		@RequestMapping(value="/emp", method=RequestMethod.POST)	public String save(Employee employee) {		employeeDao.save(employee);		return "redirect:/emps";	}		@RequestMapping(value="/emp/{id}", method=RequestMethod.DELETE)	public String delete(@PathVariable("id") Integer id) {		employeeDao.delete(id);		return "redirect:/emps";	}		//与前面add操作的input方法不同，此处需要接收参数	@RequestMapping(value="/emp/{id}", method=RequestMethod.GET)	public String input(@PathVariable("id") Integer id, Map
        
          map) {	        //默认要进行表单回显，所以这里要放一个employee到map里面，		//对应input.jsp中的modelAttribute="employee"		map.put("employee", employeeDao.get(id));		map.put("departments", departmenDao.getDepartments());		return "input";	}		@RequestMapping(value="/emp", method=RequestMethod.PUT)	public String update(Employee employee) {		employeeDao.save(employee);		return "redirect:/emps";	}}

index.jsp


     
      List all employees

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"	pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
     
      
       
       
        	$(function() {		$(".delete").click(function() {			//将post请求转为delete请求			var href = $(this).attr("href");			$("form").attr("action", href).submit();			return false;		});	})
        Insert title here	
        		
         		
         
          	没有员工信息		
           
             ID LastName Email Gender Department Edit Delete  
              ${emp.id} ${emp.lastName } ${emp.email} ${emp.gender == 0 ? 'Female' : 'Male'} ${emp.department.departmentName } 
             
              Edit 
              
               Delete     
                
               
                Add new emp

<a href="emp">Add new emp</a> 链接到input页面

input.jsp 添加和修改公用

<%@page import="java.util.HashMap"%><%@ page language="java" contentType="text/html; charset=UTF-8"	pageEncoding="UTF-8"%><%@ page import="java.util.HashMap"%><%@ page import="java.util.Map"%><%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
     
      Insert title here	
      	
      	
      	
      		
       		
       			
         LastName
        				
        			
         			
         			
         				
          Email
         		
         		<%			Map
         
           genders = new HashMap();				genders.put("1", "male");				genders.put("0", "female");				request.setAttribute("genders", genders);		%> Gender
          		
          		
          Department