java中xstream jar包下载_Xstream

xStream框架

xStream可以轻易的将Java对象和xml文档相互转换，而且可以修改某个特定的属性和节点名称，而且也支持json的转换；

它们都完美支持JSON，但是对xml的支持还不是很好。一定程度上限制了对Java对象的描述，不能让xml完全体现到对Java对象的描述。这里将会介绍xStream对JSON、XML的完美支持。xStream不仅对XML的转换非常友好，而且提供annotation注解，可以在JavaBean中完成对xml节点、属性的描述。以及对JSON也支持，只需要提供相关的JSONDriver就可以完成转换。

一、准备工作

1、 下载jar包、及官方资源

xStream的jar下载地址：

添加xstream-1.3.1.jar文件到工程中，就可以开始下面的工作；需要的jar如下：

2、 测试用例代码

package com.hoo.test;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.StringReader;import java.io.Writer;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Set;import org.codehaus.jettison.json.JSONException;import org.junit.After;import org.junit.Before;import org.junit.Test;import com.hoo.entity.Birthday;import com.hoo.entity.Classes;import com.hoo.entity.ListBean;import com.hoo.entity.Student;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.HierarchicalStreamWriter;import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;import com.thoughtworks.xstream.io.json.JsonWriter;/* function:Java对象和XML字符串的相互转换* jar-lib-version: xstream-1.3.1* @author hoojo* @createDate Nov 27, 2010 12:15:15 PM* @file XStreamTest.java* @package com.hoo.test* @project WebHttpUtils* @blog http://blog.csdn.net/IBM_hoojo* @email * @version 1.0*/@SuppressWarnings(“unchecked”)public class XStreamTest {private XStream xstream = null;private ObjectOutputStream out = null;private ObjectInputStream in = null;private Student bean = null;/* function:初始化资源准备* @author hoojo* @createDate Nov 27, 2010 12:16:28 PM*/@Beforepublic void init() {try {xstream = new XStream();//xstream = new XStream(new DomDriver()); // 需要xpp3 jar} catch (Exception e) {e.printStackTrace();}bean = new Student();bean.setAddress(“china”);bean.setEmail(“”);bean.setId(1);bean.setName(“jack”);Birthday day = new Birthday();day.setBirthday(“2010-11-22”);bean.setBirthday(day);}/* function:释放对象资源* @author hoojo* @createDate Nov 27, 2010 12:16:38 PM*/@Afterpublic void destory() {xstream = null;bean = null;try {if (out != null) {out.flush();out.close();}if (in != null) {in.close();}} catch (IOException e) {e.printStackTrace();}System.gc();}public final void fail(String string) {System.out.println(string);}public final void failRed(String string) {System.err.println(string);}}

通过XStream对象的toXML方法就可以完成Java对象到XML的转换，toXML方法还有2个相同签名的方法，需要传递一个流。然后通过流来完成xml信息的输出。

3、 需要的JavaBean

package com.hoo.entity;public class Student {private int id;private String name;private String email;private String address;private Birthday birthday;//getter、setterpublic String toString() {return this.name + “#” + this.id + “#” + this.address + “#” + this.birthday + “#” + this.email;}}

二、Java转换成XML

1、 JavaBean转换XM

/* function:Java对象转换成XML字符串* @author hoojo* @createDate Nov 27, 2010 12:19:01 PM*/@Testpublic void writeBean2XML() {try {fail(“————Bean->XML————“);fail(xstream.toXML(bean));fail(“重命名后的XML”);//类重命名//xstream.alias(“account”, Student.class);//xstream.alias(“生日”, Birthday.class);//xstream.aliasField(“生日”, Student.class, “birthday”);//xstream.aliasField(“生日”, Birthday.class, “birthday”);//fail(xstream.toXML(bean));//属性重命名xstream.aliasField(“邮件”, Student.class, “email”);//包重命名xstream.aliasPackage(“hoo”, “com.hoo.entity”);fail(xstream.toXML(bean));} catch (Exception e) {e.printStackTrace();}}

看结果中的第一份xml内容，是没有经过然后修改或重命名的文档，按照原样输出。文档中的第二份文档的package经过重命名，email属性也经过重命名以及类名也可以进行重命名的。

运行后结果如下：

————Bean->

2010-11-22重命名后的邮件>

2010-11-22

2、 将List集合转换成xml文档

/* function:将Java的List集合转换成XML对象* @author hoojo* @createDate Nov 27, 2010 12:20:07 PM*/@Testpublic void writeList2XML() {try {//修改元素名称xstream.alias(“beans”, ListBean.class);xstream.alias(“student”, Student.class);fail(“———-List–>XML———-“);ListBean listBean = new ListBean();listBean.setName(“this is a List Collection”);List list = new ArrayList();list.add(bean);list.add(bean);//引用bean//list.add(listBean);//引用listBean，父元素bean = new Student();bean.setAddress(“china”);bean.setEmail(“”);bean.setId(2);bean.setName(“tom”);Birthday day = new Birthday(“2010-11-22”);bean.setBirthday(day);list.add(bean);listBean.setList(list);//将ListBean中的集合设置空元素，即不显示集合元素标签//xstream.addImplicitCollection(ListBean.class, “list”);//设置reference模型//xstream.setMode(XStream.NO_REFERENCES);//不引用xstream.setMode(XStream.ID_REFERENCES);//id引用//xstream.setMode(XStream.XPATH_ABSOLUTE_REFERENCES);//绝对路径引用//将name设置为父类(Student)的元素的属性xstream.useAttributeFor(Student.class, “name”);xstream.useAttributeFor(Birthday.class, “birthday”);//修改属性的namexstream.aliasAttribute(“姓名”, “name”);xstream.aliasField(“生日”, Birthday.class, “birthday”);fail(xstream.toXML(listBean));} catch (Exception e) {e.printStackTrace();}}

上面的代码运行后，结果如下：

———-List–>XML———-this is a List

如果不加xstream.addImplicitCollection(ListBean.class, “list”);

这个设置的话，会出现一个List节点包裹着Student节点元素。添加addImplicitCollection可以忽略这个list节点元素。那么上面的list节点就不存在，只会在beans元素中出现name、student这2个xml元素标签；

setMode是设置相同的对象的引用方式，如果设置XStream.NO_REFERENCES就是不引用，会输出2分相同的Student元素。如果是XStream.ID_REFERENCES会引用相同的那个对象的id属性，如果是XStream.XPATH_ABSOLUTE_REFERENCES引用，那么它将显示xpath路径。上面采用的id引用，这个引用了id=3的那个student标签元素；

useAttributeFor是设置某个节点显示到父节点的属性中，也就是将指定class中的指定属性，在这个class元素节点的属性中显示。

如：hoojo

设置好后就是这样的结果：

aliasAttribute是修改属性名称。

3、 在JavaBean中添加Annotation注解进行重命名设置

先看看JavaBean的代码

package com.hoo.entity;import java.util.Arrays;import java.util.Calendar;import java.util.GregorianCalendar;import java.util.List;import com.thoughtworks.xstream.annotations.XStreamAlias;import com.thoughtworks.xstream.annotations.XStreamAsAttribute;import com.thoughtworks.xstream.annotations.XStreamConverter;import com.thoughtworks.xstream.annotations.XStreamImplicit;import com.thoughtworks.xstream.annotations.XStreamOmitField;@XStreamAlias(“class”)public class Classes {/ 设置属性显示*/@XStreamAsAttribute@XStreamAlias(“名称”)private String name;/ 忽略*/@XStreamOmitFieldprivate int number;@XStreamImplicit(itemFieldName = “Students”)private List students;@SuppressWarnings(“unused”)@XStreamConverter(SingleValueCalendarConverter.class)private Calendar created = new GregorianCalendar();public Classes(){}public Classes(String name, Student… stu) {this.name = name;this.students = Arrays.asList(stu);}//getter、setter}

SingleValueCalendarConverter.java这个是一个类型转换器

package com.hoo.entity;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import com.thoughtworks.xstream.converters.Converter;import com.thoughtworks.xstream.converters.MarshallingContext;import com.thoughtworks.xstream.converters.UnmarshallingContext;import com.thoughtworks.xstream.io.HierarchicalStreamReader;import com.thoughtworks.xstream.io.HierarchicalStreamWriter;public class SingleValueCalendarConverter implements Converter {public void marshal(Object source, HierarchicalStreamWriter writer,MarshallingContext context) {Calendar calendar = (Calendar) source;writer.setValue(String.valueOf(calendar.getTime().getTime()));}public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context) {GregorianCalendar calendar = new GregorianCalendar();calendar.setTime(new Date(Long.parseLong(reader.getValue())));return calendar;}@SuppressWarnings(“unchecked”)public boolean canConvert(Class type) {return type.equals(GregorianCalendar.class);}}

再看看测试用例代码

@Testpublic void writeList2XML4Annotation() {try {failRed(“———annotation Bean –> XML———“);Student stu = new Student();stu.setName(“jack”);Classes c = new Classes(“一班”, bean, stu);c.setNumber(2);//对指定的类使用Annotation//xstream.processAnnotations(Classes.class);//启用Annotation//xstream.autodetectAnnotations(true);xstream.alias(“student”, Student.class);fail(xstream.toXML(c));} catch (Exception e) {e.printStackTrace();}}

当启用annotation或是对某个特定的类启用annotation时，上面的classes这个类才有效果。如果不启用annotation，运行后结果如下：

———annotation Bean –> XML———一班21jackjack@email.com

2010-11-220jack18Asia/Shanghai

当启用annotation后xstream.processAnnotations(Classes.class)，结果如下：

———annotation Bean –>

2010-11-220jack37

4、 Map集合转换xml文档

/* function:Java Map集合转XML* @author hoojo* @createDate Nov 27, 2010 1:13:26 PM*/@Testpublic void writeMap2XML() {try {failRed(“———Map –> XML———“);Map map = new HashMap();map.put(“No.1”, bean);//putbean = new Student();bean.setAddress(“china”);bean.setEmail(“”);bean.setId(2);bean.setName(“tom”);Birthday day = new Birthday(“2010-11-22”);bean.setBirthday(day);map.put(“No.2”, bean);//putbean = new Student();bean.setName(“jack”);map.put(“No.3”, bean);//putxstream.alias(“student”, Student.class);xstream.alias(“key”, String.class);xstream.useAttributeFor(Student.class, “id”);xstream.useAttributeFor(“birthday”, String.class);fail(xstream.toXML(map));} catch (Exception e) {e.printStackTrace();}}

运行后结果如下：

———Map –>

5、 用OutStream输出流写XML

/* function:用OutStream输出流写XML* @author hoojo* @createDate Nov 27, 2010 1:13:48 PM*/@Testpublic void writeXML4OutStream() {try {out = xstream.createObjectOutputStream(System.out);Student stu = new Student();stu.setName(“jack”);Classes c = new Classes(“一班”, bean, stu);c.setNumber(2);failRed(“———ObjectOutputStream # JavaObject–> XML———“);out.writeObject(stu);out.writeObject(new Birthday(“2010-05-33”));out.write(22);//byteout.writeBoolean(true);out.writeFloat(22.f);out.writeUTF(“hello”);} catch (Exception e) {e.printStackTrace();}}

使用输出流后，可以通过流对象完成xml的构建，即使没有JavaBean对象，你可以用流来构建一个复杂的xml文档，运行后结果如下：

———ObjectOutputStream # JavaObject–> XML———0jack2010-05-3322true22.0hello

三、XML内容转换Java对象

1、 用InputStream将XML文档转换成java对象

/* function:用InputStream将XML文档转换成java对象* 需要额外的jar xpp3-main.jar* @author hoojo* @createDate Nov 27, 2010 1:14:52 PM*/@Testpublic void readXML4InputStream() {try {String s = “0jack” +”2010-05-33″ +”22true22.0″ +”hello”;failRed(“———ObjectInputStream XML –> javaObject———“);StringReader reader = new StringReader(s);in = xstream.createObjectInputStream(reader);Student stu = (Student) in.readObject();Birthday b = (Birthday) in.readObject();byte i = in.readByte();boolean bo = in.readBoolean();float f = in.readFloat();String str = in.readUTF();System.out.println(stu);System.out.println(b);System.out.println(i);System.out.println(bo);System.out.println(f);System.out.println(str);} catch (Exception e) {e.printStackTrace();}}

读取后，转换的Java对象，结果如下：

———ObjectInputStream XML –> javaObject———jack#0#null#null#null2010-05-3322true22.0hello

2、 将xml文档转换成Java对象

/* function:将XML字符串转换成Java对象* @author hoojo* @createDate Nov 27, 2010 2:39:06 PM*/@Testpublic void readXml2Object() {try {failRed(“———–Xml >>> Bean————–“);Student stu = (Student) xstream.fromXML(xstream.toXML(bean));fail(stu.toString());List list = new ArrayList();list.add(bean);//addMap map = new HashMap();map.put(“No.1”, bean);//putbean = new Student();bean.setAddress(“china”);bean.setEmail(“”);bean.setId(2);bean.setName(“tom”);Birthday day = new Birthday(“2010-11-22”);bean.setBirthday(day);list.add(bean);//addmap.put(“No.2”, bean);//putbean = new Student();bean.setName(“jack”);list.add(bean);//addmap.put(“No.3”, bean);//putfailRed(“==========XML >>> List===========”);List studetns = (List) xstream.fromXML(xstream.toXML(list));fail(“size:” + studetns.size());//3for (Student s : studetns) {fail(s.toString());}failRed(“==========XML >>> Map===========”);Map maps = (Map) xstream.fromXML(xstream.toXML(map));fail(“size:” + maps.size());//3Set key = maps.keySet();Iterator iter = key.iterator();while (iter.hasNext()) {String k = iter.next();fail(k + “:” + map.get(k));}} catch (Exception e) {e.printStackTrace();}}

运行后结果如下：

———–Xml >>> Bean————–jack#1#china#2010-11-22#==========XML >>> List===========size:3jack#1#china#2010-11-222#china#2010-11-220#null#null#null==========XML >>> Map===========size:3No.3:jack#0#null#null#nullNo.1:jack#1#china#2010-11-22#.2:tom#2#china#2010-11-22#

怎么样，成功的完成XML到JavaBean、List、Map的转换，更多对象转换还需要大家一一尝试。用法类似~这里就不一样赘述。

四、XStream对JSON的支持

xStream对JSON也有非常好的支持，它提供了2个模型驱动。用这2个驱动可以完成Java对象到JSON的相互转换。使用JettisonMappedXmlDriver驱动，将Java对象转换成json，需要添加jettison.jar

1、 用JettisonMappedXmlDriver完成Java对象到JSON的转换

/* function:XStream结合JettisonMappedXmlDriver驱动，转换Java对象到JSON* 需要添加jettison jar* @author hoojo* @createDate Nov 27, 2010 1:23:18 PM*/@Testpublic void writeEntity2JETTSON() {failRed(“=======JettisonMappedXmlDriver===JavaObject >>>> JaonString=========”);xstream = new XStream(new JettisonMappedXmlDriver());xstream.setMode(XStream.NO_REFERENCES);xstream.alias(“student”, Student.class);fail(xstream.toXML(bean));}

运行后结果如下：

=======JettisonMappedXmlDriver===JavaObject >>>> JaonString========={“student”:{“id”:1,”name”:”jack”,”email”:””,”address”:”china”,”birthday”:[{},”2010-11-22″]}}

JSON的转换和XML的转换用法一样，只是创建XStream需要传递一个参数，这个参数就是xml到JSON映射转换的驱动。这里会降到两个驱动，分别是JettisonMappedXmlDriver、JsonHierarchicalStreamDriver。

2、 JsonHierarchicalStreamDriver完成Java对象到JSON的转换

/* function:用XStream结合JsonHierarchicalStreamDriver驱动* 转换java对象为JSON字符串* @author hoojo* @createDate Nov 27, 2010 1:16:46 PM*/@Testpublic void writeEntiry2JSON() {failRed(“======JsonHierarchicalStreamDriver====JavaObject >>>> JaonString=========”);xstream = new XStream(new JsonHierarchicalStreamDriver());//xstream.setMode(XStream.NO_REFERENCES);xstream.alias(“student”, Student.class);failRed(“——-Object >>>> JSON———“);fail(xstream.toXML(bean));//failRed(“========JsonHierarchicalStreamDriver==删除根节点=========”);//删除根节点xstream = new XStream(new JsonHierarchicalStreamDriver() {public HierarchicalStreamWriter createWriter(Writer out) {return new JsonWriter(out, JsonWriter.DROP_ROOT_MODE);}});//xstream.setMode(XStream.NO_REFERENCES);xstream.alias(“student”, Student.class);fail(xstream.toXML(bean));}

运行后结果如下：

======JsonHierarchicalStreamDriver====JavaObject >>>> JaonString=========——-Object >>>> JSON———{“student”: {“id”: 1,”name”: “jack”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}}}{“id”: 1,”name”: “jack”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}}

使用JsonHierarchicalStreamDriver转换默认会给转换后的对象添加一个根节点，但是在构建JsonHierarchicalStreamDriver驱动的时候，你可以重写createWriter方法，删掉根节点。

看上面的结果，一个是默认带根节点的JSON对象，它只是将类名作为一个属性，将对象作为该属性的一个值。而另一个没有带根属性的JSON就是通过重写createWriter方法完成的。

3、 将List集合转换成JSON字符串

@Testpublic void writeList2JSON() {failRed(“======JsonHierarchicalStreamDriver====JavaObject >>>> JaonString=========”);JsonHierarchicalStreamDriver driver = new JsonHierarchicalStreamDriver();xstream = new XStream(driver);//xstream = new XStream(new JettisonMappedXmlDriver());//转换错误//xstream.setMode(XStream.NO_REFERENCES);xstream.alias(“student”, Student.class);List list = new ArrayList();list.add(bean);//addbean = new Student();bean.setAddress(“china”);bean.setEmail(“”);bean.setId(2);bean.setName(“tom”);Birthday day = new Birthday(“2010-11-22”);bean.setBirthday(day);list.add(bean);//addbean = new Student();bean.setName(“jack”);list.add(bean);//addfail(xstream.toXML(list));//failRed(“========JsonHierarchicalStreamDriver==删除根节点=========”);//删除根节点xstream = new XStream(new JsonHierarchicalStreamDriver() {public HierarchicalStreamWriter createWriter(Writer out) {return new JsonWriter(out, JsonWriter.DROP_ROOT_MODE);}});xstream.alias(“student”, Student.class);fail(xstream.toXML(list));}

运行后结果如下

======JsonHierarchicalStreamDriver====JavaObject >>>> JaonString========={“list”: [{“id”: 1,”name”: “jack”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}},{“id”: 2,”name”: “tom”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}},{“id”: 0,”name”: “jack”}]}#[{“id”: 1,”name”: “jack”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}},{“id”: 2,”name”: “tom”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}},{“id”: 0,”name”: “jack”}]

上面的list1是使用JsonHierarchicalStreamDriver 转换的，当然你也可以使用JettisonMappedXmlDriver驱动进行转换；用JettisonMappedXmlDriver转换后，你会发现格式不同而且没有根属性。

4、 Map转换json

@Testpublic void writeMap2JSON() {failRed(“======JsonHierarchicalStreamDriver==== Map >>>> JaonString=========”);xstream = new XStream(new JsonHierarchicalStreamDriver());//xstream = new XStream(new JettisonMappedXmlDriver());xstream.alias(“student”, Student.class);Map map = new HashMap();map.put(“No.1”, bean);//putbean = new Student();bean.setAddress(“china”);bean.setEmail(“”);bean.setId(2);bean.setName(“tom”);bean.setBirthday(new Birthday(“2010-11-21”));map.put(“No.2”, bean);//putbean = new Student();bean.setName(“jack”);map.put(“No.3”, bean);//putfail(xstream.toXML(map));//failRed(“========JsonHierarchicalStreamDriver==删除根节点=========”);//删除根节点xstream = new XStream(new JsonHierarchicalStreamDriver() {public HierarchicalStreamWriter createWriter(Writer out) {return new JsonWriter(out, JsonWriter.DROP_ROOT_MODE);}});xstream.alias(“student”, Student.class);fail(xstream.toXML(map));}

运行后结果如下：

======JsonHierarchicalStreamDriver==== Map >>>> JaonString========={“map”: [[“No.3”,{“id”: 0,”name”: “jack”}],[“No.1”,{“id”: 1,”name”: “jack”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}}],[“No.2”,{“id”: 2,”name”: “tom”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-21”}}]]}[[“No.3”,{“id”: 0,”name”: “jack”}],[“No.1”,{“id”: 1,”name”: “jack”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}}],[“No.2”,{“id”: 2,”name”: “tom”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-21”}}]]

5、 将JSON转换java对象

/* function:JsonHierarchicalStreamDriver可以将简单的json字符串转换成java对象，list、map转换不成功；* JsonHierarchicalStreamDriver读取JSON字符串到java对象出错* @author hoojo* @createDate Nov 27, 2010 1:22:26 PM* @throws JSONException*/@Testpublic void readJSON2Object() throws JSONException {String json = “{\”student\”: {” +”\”id\”: 1,” +”\”name\”: \”haha\”,” +”\”email\”: \”email\”,” +”\”address\”: \”address\”,” +”\”birthday\”: {” +”\”birthday\”: \”2010-11-22\”” +”}” +”}}”;//JsonHierarchicalStreamDriver读取JSON字符串到java对象出错，但JettisonMappedXmlDriver可以xstream = new XStream(new JettisonMappedXmlDriver());xstream.alias(“student”, Student.class);fail(xstream.fromXML(json).toString());//JettisonMappedXmlDriver转换List集合出错，但JsonHierarchicalStreamDriver可以转换正确//JettisonMappedXmlDriver 转换的字符串 {“list”:{“student”:[{“id”:1,”name”:”haha”,”email”:”email”,”address”:”address”,”birthday”:[{},”2010-11-22″]}]},”student”:{“id”:2,”name”:”tom”,”email”:””,”address”:”china”,”birthday”:[{},”2010-11-22″]}}json = “{\”list\”: [{” +”\”id\”: 1,” +”\”name\”: \”haha\”,” +”\”email\”: \”email\”,” +”\”address\”: \”address\”,” +”\”birthday\”: {” +”\”birthday\”: \”2010-11-22\”” +”}” +”},{” +”\”id\”: 2,” +”\”name\”: \”tom\”,” +”\”email\”: \”\”,” +”\”address\”: \”china\”,” +”\”birthday\”: {” +”\”birthday\”: \”2010-11-22\”” +”}” +”}]}”;System.out.println(json);//用js转换成功List list = (List) xstream.fromXML(json);System.out.println(list.size());//0好像转换失败}

运行后结果如下：

haha#1#address#2010-11-22#email{“list”: [{“id”: 1,”name”: “haha”,”email”: “email”,”address”: “address”,”birthday”: {“birthday”: “2010-11-22”}},{“id”: 2,”name”: “tom”,”email”: “”,”address”: “china”,”birthday”: {“birthday”: “2010-11-22”}}]}0

JSON到Java的转换是fromXML方法。