xstream转换xml时出错

Z时代
2024-01-10
分类：技术分享

我的xml是这样的

`<?xml version="1.0" encoding="UTF-8"?>
<MESSAGE>

<HEADER>
<MESSAGENAME>CheckRequest</MESSAGENAME>
<TRANSACTIONID>20201120110748404</TRANSACTIONID>
<REPLYSUBJECTNAME>PROD.Listen.DRYT1200</REPLYSUBJECTNAME>
<INBOXNAME />
<LISTENER>PEMListener</LISTENER>
</HEADER>

<BODY>
<LINENAME>DRYT0100</LINENAME>
<LINE_RECIPE_LIST>
<LINE_RECIPE>
<RECIPEEVENTTYPE>Check</RECIPEEVENTTYPE>
<LINERECIPENAME>E495A1A2400A1</LINERECIPENAME>
<TIMEOUT_UNIT_LIST />
<CIMOFF_UNIT_LIST />
<UNIT_LIST>
<UNITNAME>DRYT0141</UNITNAME>
<UNITRECIPENAME>11</UNITRECIPENAME>
<RECIPEPARALIST>
<PARA>
<TRACELEVEL>M</TRACELEVEL>
<PARANAME>Recipe_Version</PARANAME>
<VALUETYPE>NUMBER</VALUETYPE>
<PARAVALUE>57.5A1B_NP_ETCH</PARAVALUE>
</PARA>
<PARA>
<TRACELEVEL>M</TRACELEVEL>
<PARANAME>LINE RECIPEID</PARANAME>
<VALUETYPE>NUMBER</VALUETYPE>
<PARAVALUE>0310</PARAVALUE>
</PARA>
</RECIPEPARALIST>
</UNIT_LIST>
</LINE_RECIPE>
</LINE_RECIPE_LIST>
<OPERATORID />
<TRANSACTIONSTARTTIME>2020-11-20 11:07:49.107</TRANSACTIONSTARTTIME>
</BODY>
</MESSAGE>`

我的class是这样的：

package com.example.rvxmldemo.testmdoel;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
import java.util.ArrayList;
import java.util.List;
@XStreamAlias("MESSAGE")
public class Message {
@XStreamAlias("HEADER")
@XStreamAsAttribute
Header header;
@XStreamAlias("BODY")
@XStreamAsAttribute
Body body;
@XStreamAlias("RETURN")
@XStreamAsAttribute
Header.ReturnMessage Return;
public Message() {
}
public Header getHeader() {
return header;
}
public void setHeader(Header header) {
this.header = header;
}
public Header.ReturnMessage getReturn() {
return Return;
}
public void setReturn(Header.ReturnMessage aReturn) {
Return = aReturn;
}
public Body getBody() {
return body;
}
public void setBody(Body body) {
this.body = body;
}
@XStreamAlias("HEADER")
public class Header {
@XStreamAlias("MESSAGENAME")
@XStreamAsAttribute
String messageName;
@XStreamAlias("TRANSACTIONID")
@XStreamAsAttribute
String transactionID;
@XStreamAlias("REPLYSUBJECTNAME")
@XStreamAsAttribute
String replySubjectName;
@XStreamAlias("INBOXNAME")
@XStreamAsAttribute
String inboxName;
@XStreamAlias("LISTENER")
@XStreamAsAttribute
String listener;
public Header() {
}
@XStreamAlias("RETURN")
public class ReturnMessage {
@XStreamAlias("RETURNCODE")
String returnCode;
@XStreamAlias("RETURNMESSAGE")
String returnMessage;
public ReturnMessage() {
}
public String getReturnCode() {
return returnCode;
}
public void setReturnCode(String returnCode) {
this.returnCode = returnCode;
}
public String getReturnMessage() {
return returnMessage;
}
public void setReturnMessage(String returnMessage) {
this.returnMessage = returnMessage;
}
}
}
@XStreamAlias("BODY")
public class Body {
@XStreamAlias("LINENAME")
@XStreamAsAttribute
String lineName;
@XStreamAlias("LINE_RECIPE_LIST")
@XStreamImplicit(itemFieldName = "LINE_RECIPE")
List<LineRecipe> LINE_RECIPE_LIST;
@XStreamAlias("OPERATORID")
@XStreamAsAttribute
String operatorID;
@XStreamAlias("TRANSACTIONSTARTTIME")
@XStreamAsAttribute
String transactionStartTime;
public Body() {
getLineRecipeList();
}
public String getLineName() {
return lineName;
}
public void setLineName(String lineName) {
this.lineName = lineName;
}
public List<LineRecipe> getLineRecipeList() {
if (LINE_RECIPE_LIST == null) {
LINE_RECIPE_LIST = new ArrayList<>();
}
return LINE_RECIPE_LIST;
}
public void setLineRecipeList(List<LineRecipe> lineRecipeList) {
this.LINE_RECIPE_LIST = lineRecipeList;
}
public String getOperatorID() {
return operatorID;
}
public void setOperatorID(String operatorID) {
this.operatorID = operatorID;
}
public String getTransactionStartTime() {
return transactionStartTime;
}
public void setTransactionStartTime(String transactionStartTime) {
this.transactionStartTime = transactionStartTime;
}
}
@XStreamAlias("LINE_RECIPE")
public static class LineRecipe {
@XStreamAlias("RECIPEEVENTTYPE")
String recipeEventType;
@XStreamAlias("LINERECIPENAME")
String lineRecipeName;
@XStreamAlias("TIMEOUT_UNIT_LIST")
String TIMEOUT_UNIT_LIST;
@XStreamAlias("CIMOFF_UNIT_LIST")
String CIMOFF_UNIT_LIST;
@XStreamAlias("UNIT_LIST")
String UNIT_LIST;
public LineRecipe() {
//            getUnitList();
}
public String getRecipeEventType() {
return recipeEventType;
}
public void setRecipeEventType(String recipeEventType) {
this.recipeEventType = recipeEventType;
}
public String getLineRecipeName() {
return lineRecipeName;
}
public void setLineRecipeName(String lineRecipeName) {
this.lineRecipeName = lineRecipeName;
}
//    public List<TimeOutUnit> getTimeOutUnits() {
//        if (TIMEOUT_UNIT_LIST == null) {
//            TIMEOUT_UNIT_LIST = new ArrayList<>();
//        }
//        return TIMEOUT_UNIT_LIST;
//    }
//
//    public void setTimeOutUnits(List<TimeOutUnit> timeOutUnits) {
//        this.TIMEOUT_UNIT_LIST = timeOutUnits;
//    }
//
//    public List<CimoffUnit> getCimoffUnits() {
//        if (CIMOFF_UNIT_LIST == null) {
//            CIMOFF_UNIT_LIST = new ArrayList<>();
//        }
//        return CIMOFF_UNIT_LIST;
//    }
//
//    public void setCimoffUnits(List<CimoffUnit> cimoffUnits) {
//        this.CIMOFF_UNIT_LIST = cimoffUnits;
//    }
//        public List<Unit> getUnitList() {
//            if (UNIT_LIST == null) {
//                UNIT_LIST = new ArrayList<>();
//            }
//            return UNIT_LIST;
//        }
//
//        public void setUnitList(List<Unit> unitList) {
//            this.UNIT_LIST = unitList;
//        }
public String getTIMEOUT_UNIT_LIST() {
return TIMEOUT_UNIT_LIST;
}
public void setTIMEOUT_UNIT_LIST(String TIMEOUT_UNIT_LIST) {
this.TIMEOUT_UNIT_LIST = TIMEOUT_UNIT_LIST;
}
public String getCIMOFF_UNIT_LIST() {
return CIMOFF_UNIT_LIST;
}
public void setCIMOFF_UNIT_LIST(String CIMOFF_UNIT_LIST) {
this.CIMOFF_UNIT_LIST = CIMOFF_UNIT_LIST;
}
public String getUNIT_LIST() {
return UNIT_LIST;
}
public void setUNIT_LIST(String UNIT_LIST) {
this.UNIT_LIST = UNIT_LIST;
}
}}

我的测试类是这样的：

package com.example.rvxmldemo.testmdoel;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import java.io.*;
public class Test12 {
public static void main(String[] args) {
String xml = "F:\\xml\\message.xml";
String s = readFile(xml);
Message message = toBean(s, Message.class);
System.out.println(message);
}
public static <T> T toBean(String xmlStr, Class<T> cls) {
XStream xstream = new XStream(new DomDriver());
xstream.setClassLoader(cls.getClassLoader());
xstream.processAnnotations(cls);
T obj = (T) xstream.fromXML(xmlStr);
return obj;
}
/**
* 一次性读取全部文件数据
*
* @param strFile
* @return
*/
public static String readFile(String strFile) {
String s = "";
try {
InputStream is = new FileInputStream(strFile);
int iAvail = is.available();
byte[] bytes = new byte[iAvail];
is.read(bytes);
s = new String(bytes);
is.close();
} catch (Exception e) {
e.printStackTrace();
}
return s;
}}

启动之后报错：

` Security framework of XStream not explicitly initialized, using predefined black list on your own risk.

Exception in thread "main" com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field com.example.rvxmldemo.testmdoel.Message$LineRecipe.LINE_RECIPE
---- Debugging information ----
message             : No such field com.example.rvxmldemo.testmdoel.Message$LineRecipe.LINE_RECIPE
field               : LINE_RECIPE
class               : com.example.rvxmldemo.testmdoel.Message$LineRecipe
required-type       : com.example.rvxmldemo.testmdoel.Message$LineRecipe
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path                : /MESSAGE/BODY/LINE_RECIPE_LIST/LINE_RECIPE
class[1]            : com.example.rvxmldemo.testmdoel.Message$Body
required-type[1]    : com.example.rvxmldemo.testmdoel.Message$Body
class[2]            : com.example.rvxmldemo.testmdoel.Message
required-type[2]    : com.example.rvxmldemo.testmdoel.Message
version             : 1.4.14

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.handleUnknownField(AbstractReflectionConverter.java:520)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:371)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:277)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:445)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:277)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:499)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:425)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:277)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1404)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1383)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1268)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1259)
at com.example.rvxmldemo.testmdoel.Test12.toBean(Test12.java:22)
at com.example.rvxmldemo.testmdoel.Test12.main(Test12.java:12)
Disconnected from the target VM, address: '127.0.0.1:52396', transport: 'socket'`

不知道是实体类哪里错了

回答

从报错来看是说找不到这个字段LINE_RECIPE，而这个字段的定义是在Body中
xstream转换xml时出错

一看这个字段在Body里的定义就感觉有点奇怪了，可能题主要理解一下这个两个注解的差别了

@XStreamAlias

@XStreamImplicit

尤其是@XStreamImplicit，如果能明白@XStreamImplicit的含义，其实也就豁然开朗了，主要在其中的Implicit这个单词，这个是隐式的意思，打开@XStreamImplicit注解也说得比较明白，人家就是处理隐式集合的
xstream转换xml时出错

那什么是隐式集合呢？看官方解释吧(图中有个小bug，应该是隐式，不是隐藏，打错了)

xstream转换xml时出错

结合解释你再回过头看看，你就明白了，你的xml文件里的元素LINE_RECIPE_LIST实际就是一个显示的集合标志嘛，所以干嘛这时候要去用@XStreamImplicit呢？直接@XStreamAlias("LINE_RECIPE_LIST")就够了啊

所以改法的话，很简单，删除@XStreamImplicit(itemFieldName = "LINE_RECIPE")即可

 @XStreamAlias("LINE_RECIPE_LIST") List<LineRecipe> LINE_RECIPE_LIST;

当然你非要想使用@XStreamImplicit注解也行，那就把xml文件中的LINE_RECIPE变为隐式的集合即可嘛

怎么变呢？结合刚才官方那个截图，没有外面的集合标签就行啦，所以如果你想要写成

 @XStreamImplicit(itemFieldName = "LINE_RECIPE") List<LineRecipe> LINE_RECIPE_LIST;

那xml文件就必须改为
xstream转换xml时出错

当然你作为解析方，一般来说呢，比较卑微。。。估计没有权利让对方改接口，所以，只能用第一种方案，不过我额外这么一提，主要还是想让题主更清楚@XStreamImplicit的用法吧，希望能对你有所帮助

那...拜了个拜~(*￣rǒ￣)

以上是 xstream转换xml时出错的全部内容，来源链接： utcz.com/a/68992.html

xstream转换xml时出错

回答

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