8 RESTful案例

8、RESTful案例

8.1、准备工作

Employee类：

public class Employee {
    private Integer id;
    private String lastName;
    private String email;
    //1 male, 0 female
    private Integer 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;
    }
    public Employee(Integer id, String lastName, String email, Integer
            gender) {
        super();
        this.id = id;
        this.lastName = lastName;
        this.email = email;
        this.gender = gender;
    }
    public Employee() {
    }
}
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EmployeeDao类：

@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){
        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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IDEA设置自动导包：
在这里插入图片描述

8.2、功能清单

功能	URL 地址	请求方式
访问首页√	/	GET
查询全部数据√	/employee	GET
删除√	/employee/2	DELETE
跳转到添加数据页面√	/toAdd	GET
执行保存√	/employee	POST
跳转到更新数据页面√	/employee/2	GET
执行更新√	/employee	PUT

8.3、具体功能：访问首页

①配置view-controller

<mvc:view-controller path="/" view-name="index"/>
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②创建页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" >
<title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/employee}">访问员工信息</a>
</body>
</html>
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8.4、具体功能：查询所有员工数据（列表）

①控制器方法

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeDao employeeDao;


    @GetMapping("/employee")
    public String getAllEmployee(Model model){
        //获取所有的员工信息
        Collection<Employee> all = employeeDao.getAll();
        //将所有员工信息在请求域中共享
        model.addAttribute("allEmployee",all);
        return "employee_list";
    }
}

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在这里插入图片描述
扫描不到，需要更改：

    
    <context:component-scan base-package="com.gao"/>
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    @GetMapping("/employee")
    public String getAllEmployee(Model model){
        //获取所有的员工信息
        Collection<Employee> all = employeeDao.getAll();
        //将所有员工信息在请求域中共享
        model.addAttribute("allEmployee",all);
        return "employee_list";
    }
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新建html（employee_list）：

<table>
    <tr>
        <th colspan="5">employee_listth>
    tr>
    <tr>
        <th>idth>
        <th>lastNameth>
        <th>emailth>
        <th>genderth>
        <th>optionsth>
    tr>
    <tr th:each="employee : ${allEmployee}">
        <td th:text="${employee.id}">td>
        <td th:text="${employee.lastName}">td>
        <td th:text="${employee.email}">td>
        <td th:text="${employee.gender}">td>
        <td>
            <a href="">updatea>
            <a href="">deletea>
        td>
    tr>
table>
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处理静态资源

static静态资源：
在这里插入图片描述
引入资源：

<head>
    <meta charset="UTF-8">
    <title>employee_listtitle>
    <link rel="stylesheet" th:href="@{/static/css/index.css}">
head>
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配置

    


    
    <mvc:default-servlet-handler/>
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8.5、具体功能：删除

使用Vue.js
通过vue处理点击事件

<div id="app">

    <table>
        <tr>
            <th colspan="5">employee_listth>
        tr>
        <tr>
            <th>idth>
            <th>lastNameth>
            <th>emailth>
            <th>genderth>
            <th>options(<a th:href="@{/to/add}">adda>)th>
        tr>
        <tr th:each="employee : ${allEmployee}">
            <td th:text="${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}}">deletea>
                <a th:href="@{'/employee/' + ${employee.id}}">updatea>
            td>
        tr>
    table>

    <form  id="delete_form" method="post">
        <input type="hidden" name="_method" value="delete">
    form>

div>


<script type="text/javascript" th:src="@{/static/js/vue.js}">script>
<script type="text/javascript">
    var vue = new Vue({
        el:"#app",
        methods:{
//event表示当前事件
            deleteEmployee:function (event) {
//通过id获取表单标签
                var delete_form = document.getElementById("delete_form");
//将触发事件的超链接的href属性为表单的action属性赋值
                delete_form.action = event.target.href;
//提交表单
                delete_form.submit();
//阻止超链接的默认跳转行为
                event.preventDefault();
            }
        }
    });

script>
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    @DeleteMapping("/employee/{id}")
    public String deleteEmployee(@PathVariable("id") Integer id){
        //删除员工信息
        employeeDao.delete(id);
        //重定向到列表
        return "redirect:/employee";
    }
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8.6、具体功能：添加数据

实现跳转到添加数据页面：

<th>options(<a th:href="@{/to/add}">adda>)th>
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springmvc.xml配置：

    <mvc:view-controller path="/" view-name="index">mvc:view-controller>
    <mvc:view-controller path="/to/add" view-name="employee_add">mvc:view-controller>
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employee_add.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>employee_add</title>
</head>
<body>
    <form th:action="@{/employee}" method="post">
        lastName:<input type="text" name="lastName"><br>
        email:<input type="text" name="email"><br>
        gender:<input type="radio" name="gender" value="1">male
        <input type="radio" name="gender" value="0">female<br>
        <input type="submit" value="add"><br>
    </form>
</body>
</html>
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重定向跳转：

    @PostMapping("/employee")
    public String addEmployee(Employee employee){
        //保存员工信息
        employeeDao.save(employee);

        return "redirect:/employee";
    }
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8.7、具体功能：修改数据

update（注意格式）

 <a th:href="@{'/employee/' + ${employee.id}}">updatea>
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页面跳转：

    @GetMapping("/employee/{id}")
    public String toUpdate(@PathVariable("id") Integer id,Model model){
        //根据id查询员工信息
        Employee employee = employeeDao.get(id);
        //将员工信息共享到请求域中
        model.addAttribute("employee",employee);
        //跳转到employee_update.html
        return "employee_update";
    }
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employee_update页面：


<form th:action="@{/employee}" method="post">
    <input type="hidden" name="_method" value="put">
    <input type="hidden" name="id" th:value="${employee.id}">
    lastName:<input type="text" name="lastName" th:value="${employee.lastName}">
    <br>
    email:<input type="text" name="email" th:value="${employee.email}"><br>
    
    gender:<input type="radio" name="gender" value="1"
                  th:field="${employee.gender}">male
    <input type="radio" name="gender" value="0"
           th:field="${employee.gender}">female<br>
    <input type="submit" value="update"><br>
form>
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update操作：

    @PutMapping("/employee")
    public String updateEmployee(Employee employee){
        //修改员工信息
        employeeDao.save(employee);
        return "redirect:/employee";
    }
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原文地址：https://blog.csdn.net/qq_44774198/article/details/126177288