SpringBoot实现restuful风格的CRUD

restuful风格：

百度百科:

RESTFUL是一种网络应用程序的设计风格和开发方式，基于HTTP，可以使用XML格式定义或JSON格式定义。RESTFUL适用于移动互联网厂商作为业务使能接口的场景，实现第三方OTT调用移动网络资源的功能，动作类型为新增、变更、删除所调用资源。

RESTFUL特点：

1、每一个URI代表1种资源；

2、客户端使用GET、POST、PUT、DELETE4个表示操作方式的动词对服务端资源进行操作：GET用来获取资源，POST用来新建资源（也可以用于更新资源），PUT用来更新资源，DELETE用来删除资源；

3、通过操作资源的表现形式来操作资源；

4、资源的表现形式是XML或者HTML；

5、客户端与服务端之间的交互在请求之间是无状态的，从客户端到服务端的每个请求都必须包含理解请求所必需的信息。

规范列表：

由于采用的是thymeleaf+bootstarp（springBoot）的结构实现

所以对于一些公共片段的抽取必须得满足thymeleaf的语法规则：

抽取：

引入：

三种引入的效果：

详见：https://www.thymeleaf.org/

工程结构：

登录拦截器：LoginHanderInterceptor

package com.zyb.webdemo.handlerInterceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 登陆拦截器
 */
public class LoginHanderInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object isLogin=request.getSession().getAttribute("isLogin");
        //没有登陆直接进主页
        if(isLogin==null){
            request.setAttribute("msg","没有权限请登录");
            request.getRequestDispatcher("/login").forward(request,response);
            return false;
        }else{
            return true;
        }

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

员工操作控制器代码：EmployeeController

package com.zyb.webdemo.controller;

import com.zyb.webdemo.dao.DepartmentDao;
import com.zyb.webdemo.dao.EmployeeDao;
import com.zyb.webdemo.entities.Department;
import com.zyb.webdemo.entities.Employee;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.Collection;
import java.util.Collections;

@Controller
public class EmployeeController {

    @Autowired
    EmployeeDao employeeDao;
    @Autowired
    DepartmentDao departmentDao;
    //返回员工列表页面
    @GetMapping("/emps")
    public String list(Model model){
        //thymeleaf默认就会拼串
        //前缀：classpath:/templates/
        //后缀：.html
        Collection<Employee>  all= employeeDao.getAll();
        //放在请求域中
        model.addAttribute("emps",all);
        return "emp/list";
    }

    //来到员工添加页面
    @GetMapping("/emp")
    public String toAddPage(Model model){
        //查出所有部门
        Collection<Department> departments = departmentDao.getDepartments();
        model.addAttribute("depts",departments);
        //返回员工添加页面的映射
        return "emp/add";
    }

    //员工添加
    //SpringMvc自动将请求和入参对象的属性一一绑定；要求请求参数的名字和javaBean入参对想想的属性名一致
    @PostMapping("/emp")
    public String addEmp(Employee employee){
        //redirect:重定向
        //forword：转发
        //System.out.println("员工信息："+employee);
        //保存员工
        employeeDao.save(employee);
        return "redirect:/emps";
    }

    @GetMapping("/emp/{id}")
    public String toEditPage(@PathVariable("id") Integer id,
                             Model model){
        Employee employee = employeeDao.get(id);
        model.addAttribute("emp",employee);

        Collection<Department> departments = departmentDao.getDepartments();
        model.addAttribute("depts",departments);
        //回到修改界面
        return "emp/edit";
    }

    //员工修改
    @PutMapping("/emp")
    public String updateEmployee(Employee employee){
        employeeDao.save(employee);
        return "redirect:/emps";
    }
    @DeleteMapping("/emp/{id}")
    public String deleteEmployee(@PathVariable("id") Integer id){
    employeeDao.delete(id);
    return "redirect:/emps";
    }
}

MySpringMvcConfig的配置：

package com.zyb.webdemo.config;


import com.zyb.webdemo.component.MyLocaleResolver;
import com.zyb.webdemo.handlerInterceptor.LoginHanderInterceptor;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
//2.0之后直接实现 WebMvcConfigurer就行
public class MySpringmvcConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");
        registry.addViewController("/login").setViewName("login");
        registry.addViewController("/main").setViewName("dashboard");//后面自动加html
    }

    //注册拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHanderInterceptor()).addPathPatterns("/**")
                .excludePathPatterns("/login","/user/login","/","/assert/**","/webjars/**");
    }


    @Bean//将组件注册在容器中
    public LocaleResolver localeResolver(){

        return new MyLocaleResolver();
    }

}

因为浏览器不直接支持put、delete的请求，所以需要post请求作为中间请求进行变换

edit.html:(修改页面)

<!DOCTYPE html>
<!-- saved from url=(0052)http://getbootstrap.com/docs/4.0/examples/dashboard/ -->
<html lang="en"  xmlns:th="http://www.thymeleaf.org">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="description" content="">
    <meta name="author" content="">

    <title>Dashboard Template for Bootstrap</title>
    <!-- Bootstrap core CSS -->
    <link href="../../static/asserts/css/bootstrap.min.css" th:href="@{/asserts/css/bootstrap.min.css}" rel="stylesheet">

    <!-- Custom styles for this template -->
    <link href="../../static/asserts/css/dashboard.css" th:href="@{/asserts/css/dashboard.css}" rel="stylesheet">
    <style type="text/css">
        /* Chart.js */

        @-webkit-keyframes chartjs-render-animation {
            from {
                opacity: 0.99
            }
            to {
                opacity: 1
            }
        }

        @keyframes chartjs-render-animation {
            from {
                opacity: 0.99
            }
            to {
                opacity: 1
            }
        }

        .chartjs-render-monitor {
            -webkit-animation: chartjs-render-animation 0.001s;
            animation: chartjs-render-animation 0.001s;
        }
    </style>
</head>

<body>
<!--    引入头部搜索栏-->
<div th:replace="~{commons/common::topbar}"></div>

<div class="container-fluid">
    <div class="row">
        <div th:replace="~{commons/common::#menu(activeUri='emplist')}"></div>

        <main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
            <form th:action="@{/emp}" method="post">
                <!--发送put请求修改员工数据-->
                <!--
                1、SpringMVC中配置HiddenHttpMethodFilter;（SpringBoot自动配置好的）
                2、页面创建一个post表单
                3、创建一个input项，name="_method";值就是我们指定的请求方式
                -->
                <input type="hidden" name="_method" value="put" />
                <input type="hidden" name="id"  th:value="${emp.id}">
                <div class="form-group">
                    <label>LastName</label>
                    <input name="lastName" type="text" class="form-control" placeholder="zhangsan" th:value="${emp.lastName}">
                </div>
                <div class="form-group">
                    <label>Email</label>
                    <input name="email" type="email" class="form-control" placeholder="zhangsan@atguigu.com" th:value="${emp.email}">
                </div>
                <div class="form-group">
                    <label>Gender</label><br/>
                    <div class="form-check form-check-inline">
                        <input class="form-check-input" type="radio" name="gender" value="1" th:checked="${emp.gender==1}">
                        <label class="form-check-label">男</label>
                    </div>
                    <div class="form-check form-check-inline">
                        <input class="form-check-input" type="radio" name="gender" value="0" th:checked="${emp.gender==0}">
                        <label class="form-check-label">女</label>
                    </div>
                </div>
                <div class="form-group">
                    <label>department</label>
                    <!--提交的是部门的id-->
                    <select class="form-control" name="department.id">
                        <option th:selected="${dept.id == emp.department.id}" th:value="${dept.id}" th:each="dept:${depts}" th:text="${dept.departmentName}">1</option>
                    </select>
                </div>
                <div class="form-group">
                    <label>Birth</label>
                    <input name="birth" type="text" class="form-control" placeholder="zhangsan" th:value="${#dates.format(emp.birth, 'yyyy-MM-dd')}">
                </div>
                <button type="submit" class="btn btn-primary" >修改</button>
            </form>

        </main>
    </div>
</div>

<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script type="text/javascript" src="../../static/asserts/js/jquery-3.2.1.slim.min.js" th:src="@{/asserts/js/jquery-3.2.1.slim.min.js}"></script>
<script type="text/javascript" src="../../static/asserts/js/popper.min.js" th:src="@{/asserts/js/popper.min.js}"></script>
<script type="text/javascript" src="../../static/asserts/js/bootstrap.min.js" th:src="@{/asserts/js/bootstrap.min.js}"></script>

<!-- Icons -->
<script type="text/javascript" src="../../static/asserts/js/feather.min.js" th:href="@{/asserts/js/feather.min.js}"></script>
<script>
    feather.replace()
</script>

<!-- Graphs -->
<script type="text/javascript" src="../../static/asserts/js/Chart.min.js" th:src="@{/asserts/js/Chart.min.js}"></script>
<script>
    var ctx = document.getElementById("myChart");
    var myChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
            datasets: [{
                data: [15339, 21345, 18483, 24003, 23489, 24092, 12034],
                lineTension: 0,
                backgroundColor: 'transparent',
                borderColor: '#007bff',
                borderWidth: 4,
                pointBackgroundColor: '#007bff'
            }]
        },
        options: {
            scales: {
                yAxes: [{
                    ticks: {
                        beginAtZero: false
                    }
                }]
            },
            legend: {
                display: false,
            }
        }
    });
</script>

</body>

</html>

相关实体类：

删除的实现技巧：

不能将delete按钮直接包含在form表单中：

通过js进行进行调用一个表单，不用为删除而创建多个表单

效果图：

修改页面：

不一样的烟火