本文出处：http://blog.csdn.net/chaijunkun/article/details/30257015，转载请注明。由于本人不定期会整理相关博文，会对相应内容作出完善。因此强烈建议在原始出处查看此文。
Java作为面向对象的语言，处理结构化的数据当然也可以将其对象化，这就是涉及到了转化工具。而对于XML文件来说，经常使用的是JDK 1.6开始支持的JAXB 2.0，另外还有一款叫做XStream的框架。本人在使用XStream遇到了一些问题，在此分享。
public class TestCase {
private static volatile XStream stream= null;
public static XStream getStream(){
synchronized (TestCase.class) {
if (stream==null){
stream= new XStream();
}
return stream;
}
}
public static <T> void toXML(Object obj, Class<T> clazz, OutputStream out){
XStream stream= TestCase.getStream();
stream.processAnnotations(clazz);
stream.toXML(obj, out);
return;
}
public static <T> T fromXML(InputStream in, Class<T> clazz){
XStream stream= TestCase.getStream();
stream.processAnnotations(clazz);
Object obj= stream.fromXML(in);
try{
return clazz.cast(obj);
}catch(ClassCastException e){
return null;
}
}
}<root date="2014-06-12 09:28:34.614 UTC"> <demo> <element>test1</element> </demo> <demo> <element>test2</element> </demo> </root>
<root date="2014-06-12 09:28:34.745 UTC"> <example> <element>test1</element> </example> <example> <element>test2</element> </example> </root>
package net.csdn.blog.chaijunkun.xml.case1;
import java.util.Date;
import java.util.List;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
@XStreamAlias("root")
public class Case1 {
@XStreamAlias("date")
@XStreamAsAttribute
private Date date;
@XStreamImplicit
private List<Demo> demos;
public Date getDate() {
return date;
}
//一些getters and setters...
}package net.csdn.blog.chaijunkun.xml.case1;
import com.thoughtworks.xstream.annotations.XStreamAlias;
@XStreamAlias("demo")
public class Demo {
@XStreamAlias("element")
private String element;
//一些getters and setters...
}package net.csdn.blog.chaijunkun.xml.case2;
import java.util.Date;
import java.util.List;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
@XStreamAlias("root")
public class Case2 {
@XStreamAlias("date")
@XStreamAsAttribute
private Date date;
@XStreamImplicit
private List<Example> examples;
//一些getters and setters...
}package net.csdn.blog.chaijunkun.xml.case2;
import com.thoughtworks.xstream.annotations.XStreamAlias;
@XStreamAlias("example")
public class Example {
@XStreamAlias("element")
private String element;
//一些getters and setters...
}public static void demo1() throws FileNotFoundException{
Demo d1= new Demo();
d1.setElement("test1");
Demo d2= new Demo();
d2.setElement("test2");
List<Demo> demos= new LinkedList<Demo>();
demos.add(d1);
demos.add(d2);
Case1 c1= new Case1();
c1.setDemos(demos);
c1.setDate(new Date());
FileOutputStream out1= new FileOutputStream(new File("d:\\test1.xml"));
try{
TestCase.toXML(c1, Case1.class, out1);
}finally{
try {
out1.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}public static void demo2() throws FileNotFoundException{
Example e1= new Example();
e1.setElement("test1");
Example e2= new Example();
e2.setElement("test2");
List<Example> examples= new LinkedList<Example>();
examples.add(e1);
examples.add(e2);
Case2 c2= new Case2();
c2.setExamples(examples);
c2.setDate(new Date());
FileOutputStream out2= new FileOutputStream(new File("d:\\test2.xml"));
try{
TestCase.toXML(c2, Case2.class, out2);
}finally{
try {
out2.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}public static void demo3() throws FileNotFoundException{
File f1= new File("d:\\test1.xml");
FileInputStream fis1= new FileInputStream(f1);
Case1 c11= TestCase.fromXML(fis1, Case1.class);
File f2= new File("d:\\test2.xml");
FileInputStream fis2= new FileInputStream(f2);
Case2 c22= TestCase.fromXML(fis2, Case2.class);
}@Test
public void doTest() throws FileNotFoundException{
demo1();
demo2();
demo3();
}com.thoughtworks.xstream.converters.ConversionException: Element demo of type net.csdn.blog.chaijunkun.xml.case1.Demo is not defined as field in type net.csdn.blog.chaijunkun.xml.case2.Case2 ---- Debugging information ---- class : net.csdn.blog.chaijunkun.xml.case2.Case2 required-type : net.csdn.blog.chaijunkun.xml.case2.Case2 converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter path : /root/demo line number : 4 version : null ------------------------------- at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.writeValueToImplicitCollection(AbstractReflectionConverter.java:403) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:334) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) ...........
public static XStream getStream(){
return new XStream();
}XStream单例模式下反序列化Object-Mapping问题,布布扣,bubuko.com
XStream单例模式下反序列化Object-Mapping问题
原文地址：http://blog.csdn.net/chaijunkun/article/details/30257015
