SpringMVC自动将请求参数和入参对象的属性进行一一绑定；要求请求参数的名字和javaBean入参的对象里面的属性名是一样的||员工的增删改查案例

其他 2020-04-16 21:39:17 阅读次数: 0

SpringMVC自动将请求参数和入参对象的属性进行一一绑定；要求请求参数的名字和javaBean入参的对象里面的属性名是一样的

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

Department.java

package com.atguigu.springboot.entities;

public class Department {

	private Integer id;
	private String departmentName;

	public Department() {
	}
	
	public Department(int i, String string) {
		this.id = i;
		this.departmentName = string;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getDepartmentName() {
		return departmentName;
	}

	public void setDepartmentName(String departmentName) {
		this.departmentName = departmentName;
	}

	@Override
	public String toString() {
		return "Department [id=" + id + ", departmentName=" + departmentName + "]";
	}
	
}

Employee.java

package com.atguigu.springboot.entities;

import java.util.Date;

public class Employee {

	private Integer id;
    private String lastName;

    private String email;
    //1 male, 0 female
    private Integer gender;
    private Department department;
    private Date birth;

    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 Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }
    public Employee(Integer id, String lastName, String email, Integer gender,
                    Department department) {
        super();
        this.id = id;
        this.lastName = lastName;
        this.email = email;
        this.gender = gender;
        this.department = department;
        this.birth = new Date();
    }

    public Employee() {
    }

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

DepartmentDao.java

package com.atguigu.springboot.dao;

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

import com.atguigu.springboot.entities.Department;
import org.springframework.stereotype.Repository;

@Repository
public class DepartmentDao {

	private static Map<Integer, Department> departments = null;
	
	static{
		departments = new HashMap<Integer, Department>();
		
		departments.put(101, new Department(101, "D-AA"));
		departments.put(102, new Department(102, "D-BB"));
		departments.put(103, new Department(103, "D-CC"));
		departments.put(104, new Department(104, "D-DD"));
		departments.put(105, new Department(105, "D-EE"));
	}
	
	public Collection<Department> getDepartments(){
		return departments.values();
	}
	
	public Department getDepartment(Integer id){
		return departments.get(id);
	}
	
}

EmployeeDao.java

package com.atguigu.springboot.dao;

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

import com.atguigu.springboot.entities.Department;
import com.atguigu.springboot.entities.Employee;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class EmployeeDao {

	private static Map<Integer, Employee> employees = null;
	
	@Autowired
	private DepartmentDao departmentDao;
	
	static{
		employees = new HashMap<Integer, Employee>();

		employees.put(1001, new Employee(1001, "E-AA", "[email protected]", 1, new Department(101, "D-AA")));
		employees.put(1002, new Employee(1002, "E-BB", "[email protected]", 1, new Department(102, "D-BB")));
		employees.put(1003, new Employee(1003, "E-CC", "[email protected]", 0, new Department(103, "D-CC")));
		employees.put(1004, new Employee(1004, "E-DD", "[email protected]", 0, new Department(104, "D-DD")));
		employees.put(1005, new Employee(1005, "E-EE", "[email protected]", 1, new Department(105, "D-EE")));
	}
	
	private static Integer initId = 1006;
	
	public void save(Employee employee){
		if(employee.getId() == null){
			employee.setId(initId++);
		}
		
		employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));
		employees.put(employee.getId(), employee);
	}

	//查询所有员工
	public Collection<Employee> getAll(){
		return employees.values();
	}
	
	public Employee get(Integer id){
		return employees.get(id);
	}
	
	public void delete(Integer id){
		employees.remove(id);
	}
}

EmployeeController.java

package com.atguigu.springboot.controller;

import com.atguigu.springboot.dao.DepartmentDao;
import com.atguigu.springboot.dao.EmployeeDao;
import com.atguigu.springboot.entities.Department;
import com.atguigu.springboot.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;

@Controller
public class EmployeeController {
    @Autowired
    EmployeeDao employeeDao;

    @Autowired
    DepartmentDao departmentDao;

    //查询所有员工返回列表页面
    @GetMapping("/emps")
    public String  list(Model model){
        Collection<Employee> employees = employeeDao.getAll();
        //放在请求域中
        model.addAttribute("emps",employees);
        // thymeleaf默认就会拼串
        // classpath:/templates/xxxx.html
        return "emp/list";
    }

    //来到员工添加页面
    @GetMapping("/emp")
    public String toAddPage(Model model){
        //来到添加页面,查出所有的部门，在页面显示
        Collection<Department> departments = departmentDao.getDepartments();
        model.addAttribute("depts",departments);
        return "emp/add";
    }

    //员工添加
    //SpringMVC自动将请求参数和入参对象的属性进行一一绑定；要求请求参数的名字和javaBean入参的对象里面的属性名是一样的
    @PostMapping("/emp")
    public String addEmp(Employee employee){
        //来到员工列表页面
        System.out.println("保存的员工信息："+employee);
        //保存员工
        employeeDao.save(employee);
        // redirect: 表示重定向到一个地址  /代表当前项目路径
        // forward: 表示转发到一个地址
        return "redirect:/emps";
    }

    //来到修改页面，查出当前员工，在页面回显
    @GetMapping("/emp/{id}")
    public String toEditPage(@PathVariable("id") Integer id,Model model){
        Employee employee = employeeDao.get(id);
        model.addAttribute("emp",employee);

        //页面要显示所有的部门列表
        Collection<Department> departments = departmentDao.getDepartments();
        model.addAttribute("depts",departments);
        //回到修改页面(add是一个修改添加二合一的页面);
        return "emp/add";
    }

    //员工修改；需要提交员工id；
    @PutMapping("/emp")
    public String updateEmployee(Employee employee){
        System.out.println("修改的员工数据："+employee);
        employeeDao.save(employee);
        return "redirect:/emps";
    }

    //员工删除
    @DeleteMapping("/emp/{id}")
    public String deleteEmployee(@PathVariable("id") Integer id){
        employeeDao.delete(id);
        return "redirect:/emps";
    }

}

list.html

<!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="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">

		<!-- Custom styles for this template -->
		<link href="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>
		<!--引入抽取的topbar-->
		<!--模板名：会使用thymeleaf的前后缀配置规则进行解析-->
		<div th:replace="commons/bar::topbar"></div>

		<div class="container-fluid">
			<div class="row">
				<!--引入侧边栏-->
				<div th:replace="commons/bar::#sidebar(activeUri='emps')"></div>

				<main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
					<h2><a class="btn btn-sm btn-success" href="emp" th:href="@{/emp}">员工添加</a></h2>
					<div class="table-responsive">
						<table class="table table-striped table-sm">
							<thead>
								<tr>
									<th>#</th>
									<th>lastName</th>
									<th>email</th>
									<th>gender</th>
									<th>department</th>
									<th>birth</th>
									<th>操作</th>
								</tr>
							</thead>
							<tbody>
								<tr th:each="emp:${emps}">
									<td th:text="${emp.id}"></td>
									<td>[[${emp.lastName}]]</td>
									<td th:text="${emp.email}"></td>
									<td th:text="${emp.gender}==0?'女':'男'"></td>
									<td th:text="${emp.department.departmentName}"></td>
									<td th:text="${#dates.format(emp.birth, 'yyyy-MM-dd HH:mm')}"></td>
									<td>
										<a class="btn btn-sm btn-primary" th:href="@{/emp/}+${emp.id}">修改</a>

										<button th:attr="del_uri=@{/emp/}+${emp.id}" class="btn btn-sm btn-danger deleteBtn">删除</button>

									</td>
								</tr>
							</tbody>
						</table>
					</div>
				</main>

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

			</div>
		</div>

		<!-- Bootstrap core JavaScript
    ================================================== -->
		<!-- Placed at the end of the document so the pages load faster -->
		<script type="text/javascript" src="asserts/js/jquery-3.2.1.slim.min.js" th:src="@{/webjars/jquery/3.3.1/jquery.js}"></script>
		<script type="text/javascript" src="asserts/js/popper.min.js" th:src="@{/webjars/popper.js/1.11.1/dist/popper.js}"></script>
		<script type="text/javascript" src="asserts/js/bootstrap.min.js" th:src="@{/webjars/bootstrap/4.0.0/js/bootstrap.js}"></script>

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

		<script>
			$(".deleteBtn").click(function(){
			    //删除当前员工的
			    $("#deleteEmpForm").attr("action",$(this).attr("del_uri")).submit();
			    return false;
            });
		</script>
	</body>
</html>

add.html

<!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="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">

		<!-- Custom styles for this template -->
		<link href="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>
		<!--引入抽取的topbar-->
		<!--模板名：会使用thymeleaf的前后缀配置规则进行解析-->
		<div th:replace="commons/bar::topbar"></div>

		<div class="container-fluid">
			<div class="row">
				<!--引入侧边栏-->
				<div th:replace="commons/bar::#sidebar(activeUri='emps')"></div>

				<main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
					<!--需要区分是员工修改还是添加；-->
					<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" th:if="${emp!=null}"/>
						<input type="hidden" name="id" th:if="${emp!=null}" th:value="${emp.id}">
						<div class="form-group">
							<label>LastName</label>
							<input name="lastName" type="text" class="form-control" placeholder="zhangsan" th:value="${emp!=null}?${emp.lastName}">
						</div>
						<div class="form-group">
							<label>Email</label>
							<input name="email" type="email" class="form-control" placeholder="[email protected]" th:value="${emp!=null}?${emp.email}">
						</div>
						<div class="form-group">
							<label>Gender</label><br/>
							<div class="form-check form-check-inline">
								<input class="form-check-input" type="radio" name="gender" value="1" th:checked="${emp!=null}?${emp.gender==1}">
								<label class="form-check-label">男</label>
							</div>
							<div class="form-check form-check-inline">
								<input class="form-check-input" type="radio" name="gender" value="0" th:checked="${emp!=null}?${emp.gender==0}">
								<label class="form-check-label">女</label>
							</div>
						</div>
						<div class="form-group">
							<label>department</label>
							<!--提交的是部门的id-->
							<select class="form-control" name="department.id">
								<option th:selected="${emp!=null}?${dept.id == emp.department.id}" th:value="${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="${emp!=null}?${#dates.format(emp.birth, 'yyyy-MM-dd HH:mm')}">
						</div>
						<button type="submit" class="btn btn-primary" th:text="${emp!=null}?'修改':'添加'">添加</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="asserts/js/jquery-3.2.1.slim.min.js" th:src="@{/webjars/jquery/3.3.1/jquery.js}"></script>
		<script type="text/javascript" src="asserts/js/popper.min.js" th:src="@{/webjars/popper.js/1.11.1/dist/popper.js}"></script>
		<script type="text/javascript" src="asserts/js/bootstrap.min.js" th:src="@{/webjars/bootstrap/4.0.0/js/bootstrap.js}"></script>

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

	</body>

</html>

http://localhost:8083/crud/emps 

http://localhost:8083/crud/emp

http://localhost:8083/crud/emp/1001

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