springboot后台管理系统+博客系统+权限layui文件系统开源源码


  springboot管理系统是一种软件体系结构样式,它定义了一组用于创建Web服务的约束。遵循REST体系结构风格的Web服务,称为RESTful Web服务,提供Internet上计算机系统之间的互操作性。基于rest的Web服务允许请求系统通过使用统一的、预定义的无状态操作集来访问和操作Web资源的文本表示。其他类型的Web服务,如SOAP Web服务,公开它们自己的任意操作集。

 

  springboot后台权限管理系统及文件博客系统源码:s.ymzan.top

  

  在本文中,我们将了解如何使用rest API创建springboot后台管理系统。

  

 

  Spring被广泛用于创建可伸缩的应用程序。对于web应用,Spring提供了Spring MVC,这是Spring中被广泛使用的模块,用于创建可伸缩的web应用。但是spring项目的主要缺点是配置非常耗时,并且对新开发人员来说可能有点难以承受。解决方案是Spring Boot。Spring Boot构建在弹簧的顶部,包含弹簧的所有特性。在本文中,我们将创建一个REST API来将员工添加到员工列表并获得员工列表。为了做到这一点,我们首先必须在任何IDE中创建一个简单的Spring Boot项目,并遵循以下步骤:

  

  1、最初,我们需要定义员工实体。因此,定义了以下employee类:

package com.example.demo;

// Creating an entity Employee
public class Employee {

    public Employee() {}

    // Parameterized Constructor
    // to assign the values
    // to the properties of
    // the entity
    public Employee(
        Integer id, String firstName,
        String lastName, String email)
    {

        super();

        this.id = id;

        this.firstName = firstName;

        this.lastName = lastName;

        this.email = email;

         
    }

     private Integer id;

     private String firstName;

     private String lastName;

     private String email;

    // Overriding the toString method
    // to find all the values
    @Override
 public String toString()
    {

        return "Employee [id="
            + id + ", firstName="
            + firstName + ", lastName="
            + lastName + ", email="
            + email + "]";

         
    }

    // Getters and setters of
    // the properties
    public Integer getId()
    {

        return id;
    }

    public void setId(Integer id)
    {

        this.id = id;
    }

    public String getFirstName()
    {

        return firstName;
    }

    public void setFirstName(
        String firstName)
    {

        this.firstName = firstName;
    }

    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;
    }
}

  2、现在,我们需要创建一个存储类,存储所有员工的列表:

package com.example.demo;

import java.util.ArrayList;
import java.util.List;

// Class to store the list of
// all the employees in an
// Array List
public class Employees {

    private List<Employee> employeeList;

    // Method to return the list
    // of employees
    public List<Employee> getEmployeeList()
    {

        if (employeeList == null) {

            employeeList
                = new ArrayList<>();

               
        }

        return employeeList;

         
    }

    public void
    setEmployeeList(
        List<Employee> employeeList)
    {
        this.employeeList
            = employeeList;
    }
}

  3、到目前为止,我们已经定义了实体雇员并创建了一个存储类。现在,我们需要接触员工。因此,我们创建了一个类,在这个类中我们将创建一个存储类的对象来存储雇员:

package com.example.demo;

import org.springframework
    .stereotype
    .Repository;

// Importing the employees class to
// use the defined properties
// in this class
import com.example.demo.Employees;

@Repository

// Class to create a list
// of employees
public class EmployeeDAO {

    private static Employees list
        = new Employees();

    // This static block is executed
    // before executing the main
    // block
    static
    {

        // Creating a few employees
        // and adding them to the list
        list.getEmployeeList().add(
            new Employee(
                1,
                "Prem",
                "Tiwari",
                "chapradreams@gmail.com"));

        list.getEmployeeList().add(
            new Employee(
                2, "Vikash",
                "Kumar",
                "abc@gmail.com"));

        list.getEmployeeList().add(
            new Employee(
                3, "Ritesh",
                "Ojha",
                "asdjf@gmail.com"));

         
    }

    // Method to return the list
    public Employees getAllEmployees()
    {

        return list;
    }

     
        // Method to add an employee
        // to the employees list
        public void
        addEmployee(Employee employee)
    {
        list.getEmployeeList()
            .add(employee);
         
    }
}

  4、最后,我们需要创建一个控制器类,它是REST API的实际实现。根据REST规则,数据库中的每个新条目必须由POST方法调用,数据库中的所有请求必须使用GET方法调用。下面的代码实现了相同的方法:

package com.example.demo;

import java.net.URI;
import org.springframework.beans
    .factory.annotation.Autowired;
import org.springframework.http
    .ResponseEntity;
import org.springframework.web.bind
    .annotation.GetMapping;
import org.springframework.web.bind
    .annotation.PostMapping;
import org.springframework.web.bind
    .annotation.RequestBody;
import org.springframework.web.bind
    .annotation.RequestMapping;
import org.springframework.web.bind
    .annotation.RestController;
import org.springframework.web.servlet
    .support.ServletUriComponentsBuilder;

// Import the above-defined classes
// to use the properties of those
// classes
import com.example.demo.Employees;
import com.example.demo.EmployeeDAO;
import com.example.demo.Employee;

// Creating the REST controller
@RestController
@RequestMapping(path = "/employees")
public class EmployeeController {

    @Autowired
 private EmployeeDAO employeeDao;
     
        // Implementing a GET method
        // to get the list of all
        // the employees
 @GetMapping(
        path = "/",
        produces = "application/json")

    public Employees getEmployees()
    {

        return employeeDao
            .getAllEmployees();
    }

     
        // Create a POST method
        // to add an employee
        // to the list
 @PostMapping(
        path = "/",
        consumes = "application/json",
        produces = "application/json")

    public ResponseEntity<Object> addEmployee(
        @RequestBody Employee employee)
    {

        // Creating an ID of an employee
        // from the number of employees
        Integer id
            = employeeDao
                .getAllEmployees()
                .getEmployeeList()
                .size()
            + 1;

        employee.setId(id);

        employeeDao
            .addEmployee(employee);

        URI location
            = ServletUriComponentsBuilder
                .fromCurrentRequest()
                .path("/{id}")
                .buildAndExpand(
                    employee.getId())
                .toUri();

           return ResponseEntity
            .created(location)
            .build();
    }
}

  5、在实现项目中的所有类之后,以弹簧启动应用程序。一旦服务器开始运行,我们就可以通过浏览器或邮递员发送请求。我们可以通过以下URL访问正在运行的应用程序:

  

  localhost:8080/employees/

  

  以下是运行上述项目时产生的输出:

  

  当执行GET请求时:

  

 

  当POST请求被执行时:

  

 

  再次在执行POST请求后碰到GET请求:

 


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