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

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

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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

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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 departments = null;
	
	static{
		departments = new HashMap();
		
		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 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 employees = null;
	
	@Autowired
	private DepartmentDao departmentDao;
	
	static{
		employees = new HashMap();

		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 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 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 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 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

	
		
		
		
		

		
		
		

		
		
		
	

	
		
		
		


		

			

				
				


				

					
员工添加
					

						

							

								

									
#
									
lastName
									
email
									
gender
									
department
									
birth
									
操作
								
							
							

								

									

									
[[${emp.lastName}]]
									

									

									

									

									

										修改

										删除

									
								
							
						
					
				

				

					
				

			
		

		
		
		
		
		

		
		
		

		
	

add.html

	
		
		
		
		

		
		
		

		
		
		
	

	
		
		
		


		

			

				
				


				

					
					

						
						
						
						
						

							LastName
							
						
						

							Email
							
						
						

							Gender

							

								
								男
							
							

								
								女
							
						
						

							department
							
							
								1
							
						
						

							Birth
							
						
						添加
					
				
			
		

		
		
		
		
		

		
		
		

	

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http://localhost:8083/crud/emps 

http://localhost:8083/crud/emp

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