Mapstruct转换对象

踩坑：

返回对象时报错

1.记得加@RestController注解

2.记得引入依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>juc_01</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct</artifactId>
            <version>1.3.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-processor</artifactId>
            <version>1.3.1.Final</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>

<!--    JAXB API是java EE 的API，在java SE 9.0 中不再包含这个 Jar 包    -->


        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-core</artifactId>
            <version>2.3.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.10.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.10.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.10.0</version>
        </dependency>
    </dependencies>

</project>

实体类对象

package com.medaxis.test;

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Calendar;
import java.util.Date;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class User  {

    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String name;
    private String age;
    private Date createTime;
    private  Address address;

}

Dto对象

package com.medaxis.test;

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Builder
@NoArgsConstructor
@AllArgsConstructor
@Data
public class UserDto implements Serializable {
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String username;
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String sex; // 故意多了一个sex
    private String age; // 故意多了一个sex
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String createTime;
    private String address;
    private String addressTime;


}

Convertor接口

package com.medaxis.test;

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.Mappings;


@Mapper(componentModel = "spring")
public interface UserConverter {

    @Mappings({
            @Mapping(source = "name", target = "username"),
            @Mapping(source = "createTime", target = "createTime", dateFormat = "yyyy-MM-dd"),
            @Mapping( source = "address.time",target = "addressTime"),
            @Mapping(source = "address.address", target = "address"),
            @Mapping(target = "age", ignore = true),
    })
    UserDto toUserDto(User user);

}

测试controller

package com.medaxis.test;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.xml.crypto.Data;
import java.util.Date;

@RestController
public class TestController {

    @Autowired
    UserConverter userConverter;

    @GetMapping(value = "/test")
    public UserDto   testUser(){
        User user = User.builder().name("张三").createTime(new Date()).age("12").build();
        Address address = Address.builder().address("上海").time(new Date()).build();
        user.setAddress(address);
        UserDto userDto =userConverter.toUserDto(user);
      return  userDto;
    }

}