8. RESTful案例
1. 准备工作
和传统 CRUD 一样，实现对员工信息的增删改查。
- 搭建环境
- 准备实体类
package com.atguigu.mvc.bean;
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, Integergender) {
super();
this.id = id;
this.lastName = lastName;
this.email = email;
this.gender = gender;
}
public Employee() {
}
}- 准备dao模拟数据
package com.atguigu.mvc.dao;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import com.atguigu.mvc.bean.Employee;
import org.springframework.stereotype.Repository;
@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);
}
}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 |
3. 具体功能：访问首页
①配置view-controller
<mvc:view-controller path="/" view-name="index"/>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>
4. 具体功能：查询所有员工数据
①控制器方法
@RequestMapping(value = "/employee", method = RequestMethod.GET)
public String getEmployeeList(Model model){
Collection<Employee> employeeList = employeeDao.getAll();
model.addAttribute("employeeList", employeeList);
return "employee_list";
}
②创建employee_list.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Employee Info</title>
<script type="text/javascript" th:src="@{/static/js/vue.js}"></script>
</head>
<body>
<table border="1" cellpadding="0" cellspacing="0" style="text-align:center;" id="dataTable">
<tr>
<th colspan="5">Employee Info</th>
</tr>
<tr>
<th>id</th>
<th>lastName</th>
<th>email</th>
<th>gender</th>
<th>options(<a th:href="@{/toAdd}">add</a>)</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="${employee.gender}"></td>
<td>
<a class="deleteA" @click="deleteEmployee"
th:href="@{'/employee/'+${employee.id}}">delete</a>
<a th:href="@{'/employee/'+${employee.id}}">update</a>
</td>
</tr>
</table>
</body>
</html>
5. 具体功能：删除
①创建处理delete请求方式的表单
<!-- 作用：通过超链接控制表单的提交，将post请求转换为delete请求 -->
<form id="delete_form" method="post">
<!-- HiddenHttpMethodFilter要求：必须传输_method请求参数，并且值为最终的请求方式 -->
<input type="hidden" name="_method" value="delete"/>
</form>
引入vue.js
<script type="text/javascript" th:src="@{/static/js/vue.js}"></script>
删除超链接
<a class="deleteA" @click="deleteEmployee"th:href="@{'/employee/'+${employee.id}}">delete</a>
通过vue处理点击事件
<script type="text/javascript">
var vue = new Vue({
el:"#dataTable",
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>③控制器方法
@RequestMapping(value = "/employee/{id}", method = RequestMethod.DELETE)
public String deleteEmployee(@PathVariable("id") Integer id){
employeeDao.delete(id);
return "redirect:/employee";
}
6. 具体功能：跳转到添加数据页面
①配置view-controller
<mvc:view-controller path="/toAdd" view-name="employee_add"></mvc:view-controller>②创建employee_add.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Add Employee</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>7. 具体功能：执行保存
①控制器方法
@RequestMapping(value = "/employee", method = RequestMethod.POST)
public String addEmployee(Employee employee){
employeeDao.save(employee);
return "redirect:/employee";
}8. 具体功能：跳转到更新数据页面
①修改超链接
<a th:href="@{'/employee/'+${employee.id}}">update</a>②控制器方法
@RequestMapping(value = "/employee/{id}", method = RequestMethod.GET)
public String getEmployeeById(@PathVariable("id") Integer id, Model model){
Employee employee = employeeDao.get(id);
model.addAttribute("employee", employee);
return "employee_update";
}③创建employee_update.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Update Employee</title>
</head>
<body>
<form th:action="@{/employee}" method="post">
<input type="hidden" name="_method" value="put">
<input type="hidden" name="id" th:value="${employee.id}">
lastName:<input type="text" name="lastName" th:value="${employee.lastName}">
<br>
email:<input type="text" name="email" th:value="${employee.email}"><br>
<!--
th:field="${employee.gender}"可用于单选框或复选框的回显
若单选框的value和employee.gender的值一致，则添加checked="checked"属性
-->
gender:<input type="radio" name="gender" value="1"th:field="${employee.gender}">male
<input type="radio" name="gender" value="0"th:field="${employee.gender}">female<br>
<input type="submit" value="update"><br>
</form>
</body>
</html>9. 具体功能：执行更新
①控制器方法
@RequestMapping(value = "/employee", method = RequestMethod.PUT)
public String updateEmployee(Employee employee){
employeeDao.save(employee);
return "redirect:/employee";
}本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2023-06-20，如有侵权请联系 cloudcommunity@tencent.com 删除
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