SpringMVC RestFul风格

1.准备工作

• web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--配置编码过滤器,在此之前不能获取任何参数，不然无效-->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--配置请求方式过滤器，put和delete的HiddenHttpMethodFilter过滤器-->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--配置springmvc前端控制器-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

        

          
        
        
        

          

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• 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/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置扫描组件-->
    <context:component-scan base-package="cn.zhao.controller,cn.zhao.dao"></context:component-scan>
    <!--配置视图解析器-->
    <!--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">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <!--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>
</beans>

        

          
        
        
        

          

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• pojo

package cn.zhao.pojo;

/**
 * @author stevezhao
 * @version 1.0
 * @description: 员工类
 * @date 2022/3/20 17:11
 */
public class Employee {

    private Integer id;

    private String lastName;

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

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

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

        

          
        
        
        

          

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• dao层

package cn.zhao.dao;

import cn.zhao.pojo.Employee;
import org.springframework.stereotype.Repository;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * @author stevezhao
 * @version 1.0
 * @description: dao
 * @date 2022/3/20 17:14
 */
@Repository
public class EmployeeDao {

    private static Map<Integer, Employee> employees = null;

    static {
        employees = new HashMap<Integer, Employee>();
        employees.put(1001,new Employee(1001,"EE-AA","aa@163.com",1));
        employees.put(1002,new Employee(1002,"EE-BB","bb@163.com",1));
        employees.put(1003,new Employee(1003,"EE-CC","cc@163.com",0));
        employees.put(1004,new Employee(1004,"EE-DD","dd@163.com",0));
        employees.put(1005,new Employee(1005,"EE-EE","ee@163.com",1));
    }

    private static Integer initId = 10006;

    public void save(Employee employee){
        if (employee.getId() == null){
            employee.setId(initId++);
        }
        employees.put(employee.getId(),employee);
    }

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

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

        

          
        
        
        

          

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2.完成首页

• 修改springmvc文件

<!--配置首页-->
<mvc:view-controller path="/" view-name="index"></mvc:view-controller>
<!--开启mvc注解驱动-->
<mvc:annotation-driven></mvc:annotation-driven>

        

          
        
        
        

          

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• 完成访问

4.删除员工（超链接）

/**
 * 删除员工
 * @param id
 * @return
 */
@RequestMapping(value = "/employee/{id}",method = RequestMethod.DELETE)
public String deleteEmployee(@PathVariable("id") Integer id ){
    employeeDao.delete(id);
    // 用重定向，让浏览器重发请求，如果是用转发，还是那个请求
    return "redirect:/employee";
}

        

          
        
        
        

          

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如何获取id

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>员工列表</title>
</head>
<body>
    <table border="1" cellspacing="0" cellpadding="0" style="text-align: center">
        <tr>
            <th colspan="5">Employee info</th>
        </tr>
        <tr>
            <th>id</th>
            <th>lastName</th>
            <th>email</th>
            <th>gender</th>
            <th>options</th>
        </tr>
        <tr th:each="employee : ${employeeList}">
            <td th:text="${employee.id}"></td>
            <td th:text="${employee.lastName}"></td>
            <td th:text="${employee.email}"></td>
            <td th:text="${employee.gender}"></td>
            <td>
                // 第一种方法
                <a th:href="@{/employee/}+${employee.id}">delete</a>
                <a th:href="@{/employee}">update</a>
            </td>
        </tr>
    </table>
</body>
</html>

        

          
        
        
        

          

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另一种方法

<td>
    // 第二种方法
    <a th:href="@{'/employee/'+${employee.id}}">delete</a>
    <a th:href="@{/employee}">update</a>
</td>

        

          
        
        
        

          

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继续完善

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>员工列表</title>
</head>
<body>
    <table id="dataTable" border="1" cellspacing="0" cellpadding="0" style="text-align: center">
        <tr>
            <th colspan="5">Employee info</th>
        </tr>
        <tr>
            <th>id</th>
            <th>lastName</th>
            <th>email</th>
            <th>gender</th>
            <th>options</th>
        </tr>
        <tr th:each="employee : ${employeeList}">
            <td th:text="${employee.id}"></td>
            <td th:text="${employee.lastName}"></td>
            <td th:text="${employee.email}"></td>
            <td th:text="${employee.gender}"></td>
            <td>
                <a @click="deleteEmployee"  th:href="@{'/employee/'+${employee.id}}" >delete</a>
                <a th:href="@{/employee}">update</a>
            </td>
        </tr>
    </table>

<form method="post" id="deleteForm">
    <input type="hidden" name="_method" value="delete">
</form>
<script type="text/javascript" th:src="@{/static/js/vue.js}"></script>
<script type="text/javascript">
    var vue = new Vue({
        el: "#dataTable",
        methods: {
            deleteEmployee:function (event) {
                // 根据id获取表单元素
                var deleteForm = document.getElementById("deleteForm");
                // 触发点击事件的超链接的href属性赋值给表单action
                deleteForm.action = event.target.href;
                // 提交表单
                deleteForm.submit();
                // 取消超链接默认行为
                event.preventDefault();
            }
        }
    });
</script>
</body>
</html>

        

          
        
        
        

          

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