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SpringMVC:RESTful案例 - 愚生浅末

 1 year ago
source link: https://www.cnblogs.com/kohler21/p/17155491.html
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SpringMVC:RESTful案例 - 愚生浅末 - 博客园

和传统 CRUD 一样，实现对员工信息的增删改查。

  • 准备实体类
public class Employee {
    private Integer id;
    private String lastName;
    private String email;
    //1 male, 0 female
    private Integer gender;
    //getter,setter,有参无参
}
  • 准备dao模拟数据
@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", "[email protected]", 1));
        employees.put(1002, new Employee(1002, "E-BB", "[email protected]", 1));
        employees.put(1003, new Employee(1003, "E-CC", "[email protected]", 0));
        employees.put(1004, new Employee(1004, "E-DD", "[email protected]", 0));
        employees.put(1005, new Employee(1005, "E-EE", "[email protected]", 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);
    }
}
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

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>

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>

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";
}

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>

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";
}

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>

具体功能：执行更新

控制器方法

@RequestMapping(value = "/employee", method = RequestMethod.PUT)
public String updateEmployee(Employee employee){
    employeeDao.save(employee);
    return "redirect:/employee";
}

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