Lombok之@Builder注解与构造方法参数顺序使用问题

问题

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实体类使用@lombok.Builder注解和自己手动编写的全参构造方法，构建实体类实例时部分字段值发生了错乱。

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代码

实体类【注意构造参数的顺序】

@Data
@Builder
@ApiModel(description = "二维平面统计图返回数据封装")
public class TwoDimensionalPlaneDTO implements Serializable {

	@ApiModelProperty(hidden = true)
	private static final long serialVersionUID = 1L;

	@ApiModelProperty(value = "图例名称")
	private String name;

	@ApiModelProperty(value = "统计数据")
	private String value;

	public TwoDimensionalPlaneDTO(String value,String name){
		this.name=name;
		this.value=value;
	}
}

业务层

	public List<TwoDimensionalPlaneDTO> tranCargoRealTimeInfo() {
		List<TwoDimensionalPlaneDTO> list = new ArrayList<>();
        //使用builder ，参数错乱
		list.add(TwoDimensionalPlaneDTO.builder().name("2类").value(Optional.ofNullable(reportDataManager.getDataByCond("data_int01","1000000243",null,"dim_char01","2类")).orElse("0")).build());
        //调用构造方法，顺序正常
		list.add(new TwoDimensionalPlaneDTO(Optional.ofNullable(reportDataManager.getDataByCond("data_int01","1000000243",null,"dim_char01","2类")).orElse("0"),"2类"));

		return list;
	}

结果对比：

怀疑

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@Builder 注解，在生成静态内部类后，会调用有参构造

~~~

实体类，反编译后的代码

package com.ls.uem.emer.vis.dal.dto.result;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import java.io.Serializable;

@ApiModel(description = ")
public class TwoDimensionalPlaneDTO implements Serializable {
  @ApiModelProperty(hidden = true)
  private static final long serialVersionUID = 1L;
  
  @ApiModelProperty(")
  private String name;
  
  @ApiModelProperty(")
  private String value;
  
  public void setName(String name) {
    this.name = name;
  }
  
  public void setValue(String value) {
    this.value = value;
  }
  
  public boolean equals(Object o) {
    if (o == this)
      return true; 
    if (!(o instanceof TwoDimensionalPlaneDTO))
      return false; 
    TwoDimensionalPlaneDTO other = (TwoDimensionalPlaneDTO)o;
    if (!other.canEqual(this))
      return false; 
    Object this$name = getName(), other$name = other.getName();
    if ((this$name == null) ? (other$name != null) : !this$name.equals(other$name))
      return false; 
    Object this$value = getValue(), other$value = other.getValue();
    return !((this$value == null) ? (other$value != null) : !this$value.equals(other$value));
  }
  
  protected boolean canEqual(Object other) {
    return other instanceof TwoDimensionalPlaneDTO;
  }
  
  public int hashCode() {
    int PRIME = 59;
    result = 1;
    Object $name = getName();
    result = result * 59 + (($name == null) ? 43 : $name.hashCode());
    Object $value = getValue();
    return result * 59 + (($value == null) ? 43 : $value.hashCode());
  }
  
  public String toString() {
    return "TwoDimensionalPlaneDTO(name=" + getName() + ", value=" + getValue() + ")";
  }
  
  public static TwoDimensionalPlaneDTOBuilder builder() {
    return new TwoDimensionalPlaneDTOBuilder();
  }


  // 生成的静态内部类    
  public static class TwoDimensionalPlaneDTOBuilder {
    private String name;
    
    private String value;
    
    public TwoDimensionalPlaneDTOBuilder name(String name) {
      this.name = name;
      return this;
    }
    
    public TwoDimensionalPlaneDTOBuilder value(String value) {
      this.value = value;
      return this;
    }
    
    // 问题 所在
    public TwoDimensionalPlaneDTO build() {
      //调用有参构造，但是参数顺没传对。  
      return new TwoDimensionalPlaneDTO(this.name, this.value);
    }
    
    public String toString() {
      return "TwoDimensionalPlaneDTO.TwoDimensionalPlaneDTOBuilder(name=" + this.name + ", value=" + this.value + ")";
    }
  }
  
  public String getName() {
    return this.name;
  }
  
  public String getValue() {
    return this.value;
  }
  
  public TwoDimensionalPlaneDTO(String value, String name) {
    this.name = name;
    this.value = value;
  }
}

~~~

OK ! 问题已发现。解决办法的话，首先看改实体类是否方便，如果别人也用到这个类，介意还是不要动了，可以选择用构造方法复制【没必要用builder构建了】。如果没有人用到的话，可以将构造方法的参数顺序调整正确就好了。

== 感谢原博主@青春不下线Eflying。原文地址：https://blog.csdn.net/Eflyings/article/details/108620746

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