莫名其妙灵感一来，解决了个问题（也叫纯脑补）

最新推荐文章于 2024-09-21 11:09:46 发布

原创最新推荐文章于 2024-09-21 11:09:46 发布 · 467 阅读

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#jaxb #复合对象

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1.写代码的时候发现一个奇葩问题，就是用 jaxb 转javaBean的时候，有一个bean 始终转换不出来

下面上代码：

工具类中的方法

    /**
     * Xml->Java Object.
     */
    @SuppressWarnings("unchecked")
    public <T> T fromXml(String xml) {
        try {
            StringReader reader = new StringReader(xml);
            return (T) createUnmarshaller().unmarshal(reader);
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

pojo类

ClassA

package com.test.pojo;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
		"a"	
})
public class A {
	private String a;
	
	public String getA() {
		return a;
	}
	public void setA(String a) {
		this.a = a;
	}
}

ClassB

package com.test.pojo;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
		"b"	
})
public class B {
	private String b;
	
	public String getB() {
		return b;
	}
	public void setB(String b) {
		this.b = b;
	}
}

用以下的写法

package com.test.pojo;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;



@XmlAccessorType(XmlAccessType.FIELD) 
@XmlType(name = "", propOrder = {
	    "requestID",
	    "processOrigin",
	    "processAction",
	    "a",
	    "b"
	})
@XmlRootElement(name = "IfInfo")
public class PackC {

	@XmlElement(name="RequestID") 
	private String requestID;
	@XmlElement(name="ProcessOrigin") 
	private String processOrigin;
	@XmlElement(name="ProcessAction") 
	private String processAction="0";
	
	@XmlElementWrapper(name = "Request1")
	
	@XmlElement(name = "MInfo1")
	private List<A> a;	
	@XmlElement(name = "MInfo2")
	private List<B> b;
	
	...
	//get Set 方法省略	
}

用这个测试会发现 c中只有a 被解析出来了，b始终都为null。

	JaxbBinder c = new JaxbBinder(PackC.class);
			String info = "<IfInfo>"
					+"<RequestID>1</RequestID>"
					+"<ProcessOrigin>1</ProcessOrigin>"
					+"<ProcessAction>1</ProcessAction>"
					+"<Request1>"
					+"<MInfo1>"
					+"<a>361</a>"
					+"</MInfo1>"
					+"<MInfo2>"
					+"<b>361</b>"
					+"</MInfo2>"
					+"</Request1>"
					+ "</IfInfo>";
			PackDkgl c= c.fromXml(info);

大概网上搜索了一下有没有类似问题，恩没找到。

那么脑补开始了。

packC中修改为

	@XmlElementWrapper(name = "Request1")
	@XmlElement(name = "MInfo1")
	private List<A> a;
	@XmlElementWrapper(name = "Request2")	
	@XmlElement(name = "MInfo2")
	private List<B> b;

然后测试xml 修改为

String info = "<IfInfo>"
					+"<RequestID>20160412143858c051584536b34140b70d3751afc4a880</RequestID>"
					+"<ProcessOrigin>ZHTB</ProcessOrigin>"
					+"<ProcessAction>0</ProcessAction>"
					+"<Request1>"
					+"<MInfo1>"
					+"<a>361</a>"
					+"</MInfo1>"
					+"</Request1>"
					+"<Request2>"
					+"<MInfo2>"
					+"<b>361</b>"
					+"</MInfo2>"
					+"</Request2>"
					+ "</IfInfo>";

纯脑补，直接搞定了。