SpringMVC(七）RESTful案例

一、RESTful案例之准备工作：

和传统CRUD一样，实现对员工信息的增删改查

我们所在的环境为SpringMVC(六）RESTful-CSDN博客

在此环境上我们进行创建实体类（创建pojo包下面的Employee类）：

package com.rgf.pojo;

public class Employee {
    private  Integer id;
    private  String LastName;

    private  String email;
    //1 male,0 female
    private  Integer gender;

    public Employee() {
    }

    public Employee(Integer id, String lastName, String email, Integer gender) {
        this.id = id;
        LastName = lastName;
        this.email = email;
        this.gender = gender;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getLastName() {
        return LastName;
    }

    public void setLastName(String lastName) {
        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;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", LastName='" + LastName + '\'' +
                ", email='" + email + '\'' +
                ", gender=" + gender +
                '}';
    }
}

 之后我们创建dao层里面的实现类EmployeeDao,java：

package com.rgf.dao;

import com.rgf.pojo.Employee;
import org.springframework.stereotype.Repository;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
@Repository
public class EmployeeDao {
    private  static Map<Integer, Employee>employees =null;
    static {
        employees=new HashMap<Integer,Employee>();
        employees.put(1001,new Employee(1001,"E-AA","aa@163.com",1));
        employees.put(1002,new Employee(1002,"E-BB","bb@163.com",1));
        employees.put(1003,new Employee(1003,"E-CC","cc@163.com",0));
        employees.put(1004,new Employee(1004,"E-DD","dd@163.com",0));
        employees.put(1005,new Employee(1005,"E-EE","ee@163.com",1));
    }

    private static Integer initId=1006;
    public  void save(Employee employee){
        //i++,先赋值，再自增
        if(employee.getId()==null){
            employee.setId(initId++);
        }
        employees.put(employee.getId(),employee);//如果此时员工id为null,则为添加功能；如果员工id不为null,则为修改功能。
    }

    public Collection<Employee> getAll(){
        return  employees.values();
    }

    public  Employee get(Integer id){
        return  employees.get(id);
    }

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

 之后我们创建controller层里面的实现类EmployeeController.java:

package com.rgf.controller;

import com.rgf.pojo.Employee;
import org.springframework.stereotype.Controller;

/**
 * 查询所有的员工信息-->/employee-->get
 * 跳转到添加页面-->to/Add/-->get
 * 新增员工信息-->/employee-->post
 * 跳转到修改页面-->/employee/1-->get
 * 修改员工信息-->/employee-->put
 * 删除员工信息-->/employee/1-->delete
 */
@Controller
public class EmployeeController {
  
}

二、RESTful案例之列表功能： 

我们首先进行实现列表功能：

我们的配置环境如下所示：

springmvc.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:context="http://www.springframework.org/schema/c"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--扫描控制层组件-->
    <context:component-scan base-package="spring_mvc_rest.src.main.java.com.rgf"></context:component-scan>
    <!--配置Thymeleaf视图解析器-->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine"><!--模板引擎-->
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver"><!--模板解析器-->
                <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <!--/WEB-INF/templates/index.html-->
                        <!--视图前缀+逻辑视图+视图后缀就是我们完整的物理视图，即访问index.html，不用完整路径，即index即可进行访问-->
                        <!--视图前缀-->
                       <property name="prefix" value="/WEB-INF/templates/"/>
                        <!--视图后缀-->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                     </bean>
                 </property>
            </bean>
        </property>
    </bean>
    <!--开启mvc的注解驱动-->
    <mvc:annotation-driven/>

    <!--配置视图控制器-->
    <mvc:view-controller path="/" view-name="index"></mvc:view-controller>
</beans>

 pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/P