虽说pull dom dom4j等优秀的xml解析工具使用非常广泛,但对于复杂庞大的数据交互来说,使用它们无疑让你倍加痛苦,你可能大部分精力都放在无聊繁琐的解析和拼装上,如果接口稍微改动,更令你有股辞职不相干的冲动,或许你更倾向选择JSON,但有时候你还是不得不面对JSON,XML,对象之间的转化的烦恼,如何用最简单的办法一统混乱的局面,让你全心全意做设计写业务?现在有了XStream,一切将变得美好,永远告别原始手工作坊,让你轻松的享受coding带来的快乐
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;
json-lib这个框架 ,Jackson这个框架, 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。
首先去 Xstream官方网址 下载最新的jar包,此jar包可以再java和Android环境下都适用
[java] view plain copy
- 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 [email protected]
- * @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
- */
- @Before
- public 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("[email protected]");
- 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
- */
- @After
- public 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。
需要的JavaBean
1、 JavaBean转换XM
[java] view plain copy
- /**
- * function:Java对象转换成XML字符串
- * @author hoojo
- * @createDate Nov 27, 2010 12:19:01 PM
- */
- @Test
- public 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->XML------------
[html] view plain copy
- <com.hoo.entity.Student>
- <id>1id>
- <name>jackname>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday>
- <birthday>2010-11-22birthday>
- birthday>
- com.hoo.entity.Student>
- 重命名后的XML
- <hoo.Student>
- <id>1id>
- <name>jackname>
- <邮件>[email protected]邮件>
- <address>chinaaddress>
- <birthday>
- <birthday>2010-11-22birthday>
- birthday>
- hoo.Student>
2、 将List集合转换成xml文档
[java] view plain copy
- /**
- * function:将Java的List集合转换成XML对象
- * @author hoojo
- * @createDate Nov 27, 2010 12:20:07 PM
- */
- @Test
- public 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.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("[email protected]");
- 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name
- xstream.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----------
[html] view plain copy
- <beans id="1">
- <name>this is a List Collectionname>
- <list id="2">
- <student id="3" 姓名="jack">
- <id>1id>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday id="4" 生日="2010-11-22"/>
- student>
- <student reference="3"/>
- <student id="5" 姓名="tom">
- <id>2id>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday id="6" 生日="2010-11-22"/>
- student>
- list>
- beans>
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,
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:
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
[java] view plain copy
- 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
- */
- @XStreamOmitField
- private 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
[java] view plain copy
- 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
- @Test
- public 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---------
[html] view plain copy
- <com.hoo.entity.Classes>
- <name>一班name>
- <number>2number>
- <students class="java.util.Arrays$ArrayList">
- <a class="student-array">
- <student>
- <id>1id>
- <name>jackname>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday>
- <birthday>2010-11-22birthday>
- birthday>
- student>
- <student>
- <id>0id>
- <name>jackname>
- student>
- a>
- students>
- <created>
- <time>1303292056718time>
- <timezone>Asia/Shanghaitimezone>
- created>
- com.hoo.entity.Classes>
当启用annotation后xstream.processAnnotations(Classes.class),结果如下:
---------annotation Bean --> XML---------
[html] view plain copy
- <class 名称="一班">
- <Students>
- <id>1id>
- <name>jackname>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday>
- <birthday>2010-11-22birthday>
- birthday>
- Students>
- <Students>
- <id>0id>
- <name>jackname>
- Students>
- <created>1303292242937created>
- class>
4、 Map集合转换xml文档
[java] view plain copy
- /**
- * function:Java Map集合转XML
- * @author hoojo
- * @createDate Nov 27, 2010 1:13:26 PM
- */
- @Test
- public void writeMap2XML() {
- try {
- failRed("---------Map --> XML---------");
- Map
map = new HashMap (); - map.put("No.1", bean);//put
- bean = new Student();
- bean.setAddress("china");
- bean.setEmail("[email protected]");
- bean.setId(2);
- bean.setName("tom");
- Birthday day = new Birthday("2010-11-22");
- bean.setBirthday(day);
- map.put("No.2", bean);//put
- bean = new Student();
- bean.setName("jack");
- map.put("No.3", bean);//put
- xstream.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 --> XML---------
[html] view plain copy
- <map>
- <entry>
- <key>No.3key>
- <student id="0">
- <name>jackname>
- student>
- entry>
- <entry>
- <key>No.1key>
- <student id="1">
- <name>jackname>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday birthday="2010-11-22"/>
- student>
- entry>
- <entry>
- <key>No.2key>
- <student id="2">
- <name>tomname>
- <email>[email protected]email>
- <address>chinaaddress>
- <birthday birthday="2010-11-22"/>
- student>
- entry>
- map>
5、 用OutStream输出流写XML
[java] view plain copy
- /**
- * function:用OutStream输出流写XML
- * @author hoojo
- * @createDate Nov 27, 2010 1:13:48 PM
- */
- @Test
- public 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);//byte
- out.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---------
[html] view plain copy
- <object-stream>
- <com.hoo.entity.Student>
- <id>0id>
- <name>jackname>
- com.hoo.entity.Student>
- <com.hoo.entity.Birthday>
- <birthday>2010-05-33birthday>
- com.hoo.entity.Birthday>
- <byte>22byte>
- <boolean>trueboolean>
- <float>22.0float>
- <string>hellostring>
- object-stream>
1、 用InputStream将XML文档转换成java对象
[java] view plain copy
- /**
- * 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
- */
- @Test
- public void readXML4InputStream() {
- try {
- String s = "
+ 0 jack "- "
+ 2010-05-33 "- "
22 true 22.0 " +- "
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---------
[html] view plain copy
- jack#0#null#null#null
- 2010-05-33
- 22
- true
- 22.0
- hello
2、 将xml文档转换成Java对象
[java] view plain copy
- /**
- * function:将XML字符串转换成Java对象
- * @author hoojo
- * @createDate Nov 27, 2010 2:39:06 PM
- */
- @Test
- public void readXml2Object() {
- try {
- failRed("-----------Xml >>> Bean--------------");
- Student stu = (Student) xstream.fromXML(xstream.toXML(bean));
- fail(stu.toString());
- List
list = new ArrayList (); - list.add(bean);//add
- Map
map = new HashMap (); - map.put("No.1", bean);//put
- bean = new Student();
- bean.setAddress("china");
- bean.setEmail("[email protected]");
- bean.setId(2);
- bean.setName("tom");
- Birthday day = new Birthday("2010-11-22");
- bean.setBirthday(day);
- list.add(bean);//add
- map.put("No.2", bean);//put
- bean = new Student();
- bean.setName("jack");
- list.add(bean);//add
- map.put("No.3", bean);//put
- failRed("==========XML >>> List===========");
- List
studetns = (List ) xstream.fromXML(xstream.toXML(list)); - fail("size:" + studetns.size());//3
- for (Student s : studetns) {
- fail(s.toString());
- }
- failRed("==========XML >>> Map===========");
- Map
maps = (Map ) xstream.fromXML(xstream.toXML(map)); - fail("size:" + maps.size());//3
- Set
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--------------
[html] view plain copy
- jack#1#china#2010-11-22#jack@email.com
- ==========XML >>> List===========
- size:3
- jack#1#china#2010-11-22#[email protected]
- tom#2#china#2010-11-22#[email protected]
- jack#0#null#null#null
- ==========XML >>> Map===========
- size:3
- No.3:jack#0#null#null#null
- No.1:jack#1#china#2010-11-22#[email protected]
- No.2:tom#2#china#2010-11-22#[email protected]
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。
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
[java] view plain copy
- /**
- * 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
- */
- @Test
- public 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=========
[html] view plain copy
- {"student":{"id":1,"name":"jack","email":"[email protected]","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
[java] view plain copy
- /**
- * 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
- */
- @Test
- public 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=========
[html] view plain copy
- -------Object >>>> JSON---------
- {"student": {
- "id": 1,
- "name": "jack",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-22"
- }
- }}
- {
- "id": 1,
- "name": "jack",
- "email": "[email protected]",
- "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
[java] view plain copy
- @Test
- public 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);//add
- bean = new Student();
- bean.setAddress("china");
- bean.setEmail("[email protected]");
- bean.setId(2);
- bean.setName("tom");
- Birthday day = new Birthday("2010-11-22");
- bean.setBirthday(day);
- list.add(bean);//add
- bean = new Student();
- bean.setName("jack");
- list.add(bean);//add
- fail(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=========
[html] view plain copy
- ##{"list": [
- {
- "id": 1,
- "name": "jack",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-22"
- }
- },
- {
- "id": 2,
- "name": "tom",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-22"
- }
- },
- {
- "id": 0,
- "name": "jack"
- }
- ]}
- #[
- {
- "id": 1,
- "name": "jack",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-22"
- }
- },
- {
- "id": 2,
- "name": "tom",
- "email": "[email protected]",
- "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
[java] view plain copy
- @Test
- public 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);//put
- bean = new Student();
- bean.setAddress("china");
- bean.setEmail("[email protected]");
- bean.setId(2);
- bean.setName("tom");
- bean.setBirthday(new Birthday("2010-11-21"));
- map.put("No.2", bean);//put
- bean = new Student();
- bean.setName("jack");
- map.put("No.3", bean);//put
- fail(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=========
[html] view plain copy
- {"map": [
- [
- "No.3",
- {
- "id": 0,
- "name": "jack"
- }
- ],
- [
- "No.1",
- {
- "id": 1,
- "name": "jack",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-22"
- }
- }
- ],
- [
- "No.2",
- {
- "id": 2,
- "name": "tom",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-21"
- }
- }
- ]
- ]}
- [
- [
- "No.3",
- {
- "id": 0,
- "name": "jack"
- }
- ],
- [
- "No.1",
- {
- "id": 1,
- "name": "jack",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-22"
- }
- }
- ],
- [
- "No.2",
- {
- "id": 2,
- "name": "tom",
- "email": "[email protected]",
- "address": "china",
- "birthday": {
- "birthday": "2010-11-21"
- }
- }
- ]
- ]
5、 将JSON转换java对象
运行后结果如下:
[html] view plain copy
- 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": "[email protected]","address": "china","birthday": {"birthday": "2010-11-22"}}]}
- 0
JSON到Java的转换是fromXML方法。
上面的代码是不是还不够过瘾?Xstream原则上只要是符合XML和JSON语法规范的都能可以转换成对象形式.
AndroidXstream示例下载 逐个手敲测试倾情奉上