Spring Boot DTO 到实体映射

刺骨的言语ヽ痛彻心扉 2023-09-25 12:51 13阅读 0赞

在春季启动中，有很多不同的方法可以将DTO映射到实体，反之亦然，我们可以使用[Modelmapper][]，[Mapstruct][]，[Dozermapper][]。

#### 完整示例 ####

--------------------

按照完整的文章了解如何使用模型映射器将 DTO 映射到实体对象。

创建 Spring 引导项目

--------------------

有许多不同的方法可以创建一个 Spring 启动应用程序，您可以按照以下文章创建一个 –

>> [使用 Spring 初始值设定项][Spring]  
创建 Spring 启动应用程序>>在 Spring 工具套件中创建 Spring 启动应用程序 [\[STS\]][STS]  
>>[在 IntelliJ IDEA 中创建 Spring 启动应用程序][IntelliJ IDEA _ Spring]

添加 maven 依赖项

--------------------

打开`pom.xml`并添加以下依赖项 –

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.5.5</version>
    		<relativePath /> 
    	</parent>
    	<groupId>in.bushansirgur</groupId>
    	<artifactId>springbootapp</artifactId>
    	<version>1.0.0</version>
    	<name>springbootapp</name>
    	<description>Spring boot app</description>
    	<properties>
    		<java.version>1.8</java.version>
    	</properties>
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.modelmapper</groupId>
    			<artifactId>modelmapper</artifactId>
    			<version>0.7.4</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    </project>

`spring-boot-starter-web`依赖项，用于使用 Spring MVC 构建 Web 应用程序。它使用 tomcat 作为默认的嵌入式容器。`org.modelmapper`依赖项用于使用模型映射器将 DTO 映射到实体以及将实体映射到 DTO。

创建 DTO 类

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在`in.bushansirgur.dto`包中创建`EmployeeDTO.java`并添加以下内容

package in.bushansirgur.springbootapp.entity;
    
    public class EmployeeDTO {
    	
    private String name;
    	
    	private int age;
    	
    	private String location;
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public int getAge() {
    		return age;
    	}
    
    	public void setAge(int age) {
    		this.age = age;
    	}
    
    	public String getLocation() {
    		return location;
    	}
    
    	public void setLocation(String location) {
    		this.location = location;
    	}
    	
    }

创建实体类

--------------------

在`in.bushansirgur.entity`包中创建`员工.java`并添加以下内容

package in.bushansirgur.springbootapp.entity;
    
    public class Employee {
    	
    private String name;
    	
    	private int age;
    	
    	private String location;
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public int getAge() {
    		return age;
    	}
    
    	public void setAge(int age) {
    		this.age = age;
    	}
    
    	public String getLocation() {
    		return location;
    	}
    
    	public void setLocation(String location) {
    		this.location = location;
    	}
    
    	@Override
    	public String toString() {
    		return "Employee [name=" + name + ", age=" + age + ", location=" + location + "]";
    	}
    	
    }

创建控制器

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创建`HomeController.java`在`in.bushansirgur.Controller`包中添加以下内容

package in.bushansirgur.springbootapp.controller;
    
    import org.modelmapper.ModelMapper;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RestController;
    
    import in.bushansirgur.springbootapp.entity.Employee;
    import in.bushansirgur.springbootapp.model.EmployeeDTO;
    
    @RestController
    public class HomeController {
    	
    	@Autowired
    	private ModelMapper mapper;
    	
    	@PostMapping("/save")
    	public Employee save(@RequestBody EmployeeDTO employeeDto) {
    		Employee employee = mapper.map(employeeDto, Employee.class);
    		System.out.println("Printing employee after mapping:"+employee);
    		return employee;
    	}
    }

#### 运行应用 ####

--------------------

使用以下 maven 命令运行应用程序 –

mvn spring-boot:run

**打开浏览器并输入以下网址 –**

![973bfb49c850eef1e731322c78fac780.png][]

`http://localhost:8080/save` 这篇文章就是这样

[Modelmapper]: http://modelmapper.org/getting-started/
[Mapstruct]: https://mapstruct.org/
[Dozermapper]: https://github.com/DozerMapper/dozer
[Spring]: https://bushansirgur.in/create-spring-boot-project-using-spring-initializr/
[STS]: https://bushansirgur.in/create-spring-boot-project-in-sts/
[IntelliJ IDEA _ Spring]: https://bushansirgur.in/create-spring-boot-project-in-intellij-community-edition/
[973bfb49c850eef1e731322c78fac780.png]: https://img-blog.csdnimg.cn/img_convert/973bfb49c850eef1e731322c78fac780.png