推土机映射字段类型 =“单向”未按预期工作答案

【问题标题】：Dozer Mapping field type="one-way" not working as expected推土机映射字段类型 =“单向”未按预期工作
【发布时间】：2014-11-11 11:03:46
【问题描述】：

根据 Dozer 文档，单向字段仅在“a”对象映射到“b”对象时才被映射。如果“b”映射到“a”，则该字段未映射。

但是对于下面的代码，“b”仍然被映射到“a”。

 <mapping >
    <class-a>com.examples.source.Source</class-a>
    <class-b>com.examples.destination.Destination</class-b>
    <field type="one-way">
        <a set-method="setIRCCode" get-method="getIRCCode">ircCode</a>
        <b set-method="setIrcCode" get-method="getIrcCode">ircCode</b>
    </field> 
</mapping>

package com.examples.source;
public class Source {
    protected String ircCode;

    public String getIRCCode() {
        return ircCode;
    }
    public void setIRCCode(String value) {
        this.ircCode = value;
    }
}

package com.examples.destination;
public class Destination {
    private String ircCode;
    public String getIrcCode() {
        return this.ircCode;
    }
    public void setIrcCode(String ircCode) {
        this.ircCode = ircCode;
    }
}

public class Mapping {
    public static void main(String[] args) {
      DozerBeanMapper mapper = new DozerBeanMapper(Arrays.asList(new String[]{"Dozer-Mapping.xml"}));
      Destination destinationObj=new Destination();
      destinationObj.setIrcCode("B");
      Source srcObj= mapper.map(destinationObj, Source.class);
      System.out.println("Reverse Mapping IRCCode= "+ srcObj.getIRCCode());
   }
}

运行上述代码时的输出：

Reverse Mapping IRCCode= B **(Unexpected and Wrong Result)**

预期结果是：

Reverse Mapping IRCCode= null

我使用的是 Dozer 5.4.0 版本。

【问题讨论】：

标签： java mapping pojo dozer apache-commons-beanutils

【解决方案1】：

我在 Dozer 5.5.1 中尝试了与您的帖子类似的以下代码，它提供的预期结果为 null。

代码：

public class A {

    private String aName;
    private String aPlace;
    /**
     * @return the aName
     */
    public String getaName() {
        return aName;
    }
    /**
     * @param aName the aName to set
     */
    public void setaName(String aName) {
        this.aName = aName;
    }
    /**
     * @return the aPlace
     */
    public String getaPlace() {
        return aPlace;
    }
    /**
     * @param aPlace the aPlace to set
     */
    public void setaPlace(String aPlace) {
        this.aPlace = aPlace;
    }

}

public class B {
    private String bName;
    private String bPlace;
    /**
     * @return the bName
     */
    public String getbName() {
        return bName;
    }
    /**
     * @param bName the bName to set
     */
    public void setbName(String bName) {
        this.bName = bName;
    }
    /**
     * @return the bPlace
     */
    public String getbPlace() {
        return bPlace;
    }
    /**
     * @param bPlace the bPlace to set
     */
    public void setbPlace(String bPlace) {
        this.bPlace = bPlace;
    }
}

推土机映射：

  <mapping> 
    <class-a>com.test.A</class-a>
    <class-b>com.test.B</class-b>   
    <field type="one-way">
      <a>aName</a>
      <b>bName</b>
    </field>
  </mapping>

测试：

public static void main(String[] arg){
    List<String> myMappingFiles = new ArrayList<String>(1);
    myMappingFiles.add("dozer-mapping.xml");

    DozerBeanMapper mapper = new DozerBeanMapper();
    mapper.setMappingFiles(myMappingFiles);
    B obj=new B();
    obj.setbName("Test");
    A destObject = 
        mapper.map(obj, A.class);
              System.out.println("B="+destObject.getaName());
}

输出：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
B=null

【讨论】：