xStream转换XML、JSON

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一. 简介@H_301_5@

xStream可以很容易实现Java对象和xml文档互相转换， 可以修改某个特定的属性和节点名称，xStream提供annotation注解，@H_301_5@

可以在JavaBean中完成对xml节点和属性的描述，并支持Json的转换，只需要提供相关的JSONDriver就能完成转换@H_301_5@

官方网站：http://xstream.codehaus.org/tutorial.html@H_301_5@


@H_301_5@

@H_301_5@

二. 准备工作@H_301_5@

1. 环境准备：@H_301_5@

Jar文件下载地址：@H_301_5@

https://nexus.codehaus.org/content/repositories/releases/com/thoughtworks/xstream/xstream-distribution/1.3.1/xstream-distribution-1.3.1-bin.zip
@H_301_5@

代码结构图：@H_301_5@


@H_301_5@


@H_301_5@

2. junit测试代码：@H_301_5@

@H_301_5@ 

public class XStreamTest {
	private XStream xstream;
	private ObjectOutputStream out;
	private ObjectInputStream in;
	private Student student;

	/**
	 * 初始化资源准备
	 */
	@Before
	public void init() {
		try {
			xstream = new XStream(new DomDriver());
		} catch (Exception e) {
			e.printStackTrace();
		}
		student = new Student();
		student.setAddress("china");
		student.setEmail("jack@email.com");
		student.setId(1);
		student.setName("jack");
		Birthday birthday = new Birthday(); 
		birthday.setBirthday("2010-11-22");
		student.setBirthday(birthday);
	}

	/**
	 * 释放对象资源
	 */
	@After
	public void destory() {
		xstream = null;
		student = null;
		try {
			if (out != null) {
				out.flush();
				out.close();
			}
			if (in != null) {
				in.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		System.gc();
	}
	
	/**
	 * 打印字符串
	 */
	public final void print(String string) { 
		System.out.println(string);
	}
	
	/**
	 * 高亮字符串
	 */
	public final void highLight(String string) {
		System.err.println(string);
	}

}

3. 所需实体类：

（1）Student：@H_301_5@

@H_301_5@ 

public class Student {
	private int id;
	private String name;
	private String email;
	private String address;
	private Birthday birthday;
	// getter and setter
	public String toString() {
		return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email;
	}
}


@H_301_5@ （2）Birthday

@H_301_5@ 

public class Birthday {
	private String birthday;

	public Birthday() {
	}
	
	public Birthday(String birthday) {
		this.birthday = birthday;
	}

	public String getBirthday() {
		return birthday;
	}

	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}
}

三 Java对象转为xml

1. 将JavaBean转成xml文档：@H_301_5@

@H_301_5@ 

/** 
	 * Java对象转换成XML
	 */
	@Test
	public void writeBean2XML() {
		try {
			highLight("====== Bean -> XML ======");
			print("<!-- 没有重命名的XML -->");
			print(xstream.toXML(student));
			
			print("<!-- 重命名后的XML -->");
			// 类重命名
			xstream.alias("student",Student.class);
			xstream.alias("生日",Birthday.class);
			xstream.aliasField("生日",Student.class,"birthday");
			xstream.aliasField("生日",Birthday.class,"birthday");

			// 属性重命名
			xstream.aliasField("邮件","email");

			// 包重命名
			xstream.aliasPackage("zdp","com.zdp.domain");
			print(xstream.toXML(student));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

运行结果：@H_301_5@ 

====== Bean -> XML ======
<!-- 没有重命名的XML -->
<com.zdp.domain.Student>
  <id>1</id>
  <name>jack</name>
  <email>jack@email.com</email>
  <address>china</address>
  <birthday>
    <birthday>2010-11-22</birthday>
  </birthday>
</com.zdp.domain.Student>
<!-- 重命名后的XML -->
<student>
  <id>1</id>
  <name>jack</name>
  <邮件>jack@email.com</邮件>
  <address>china</address>
  <生日>
    <生日>2010-11-22</生日>
  </生日>
</student>

第一份文档是没有经过修改或重命名的文档， 按照原样输出。@H_301_5@

第二份文档的类、属性、包都经过了重命名。@H_301_5@


@H_301_5@

2. 将List集合转成xml文档：
@H_301_5@ 

/**
	 * 将List集合转换成XML对象
	 */
	@Test
	public void writeList2XML() {
		try {
			// 修改元素名称
			highLight("====== List --> XML ======");
			xstream.alias("beans",ListBean.class);
			xstream.alias("student",Student.class);
			ListBean listBean = new ListBean();
			listBean.setName("this is a List Collection");

			List<Object> list = new ArrayList<Object>();
			// 引用javabean
			list.add(student);
			list.add(student); 
			// list.add(listBean); 引用listBean，父元素

			student = new Student();
			student.setAddress("china");
			student.setEmail("tom@125.com");
			student.setId(2);
			student.setName("tom");
			Birthday birthday = new Birthday("2010-11-22"); 
			student.setBirthday(birthday);

			list.add(student);
			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.ID_REFERENCES); // id引用
	        //xstream.setMode(XStream.NO_REFERENCES); // 不引用
	        //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");

			print(xstream.toXML(listBean));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

运行结果：@H_301_5@ 

====== List --> XML ======
<beans id="1">
  <name>this is a List Collection</name>
  <list id="2">
    <student id="3" 姓名="jack">
      <id>1</id>
      <email>jack@email.com</email>
      <address>china</address>
      <birthday id="4" 生日="2010-11-22"/>
    </student>
    <student reference="3"/>
    <student id="5" 姓名="tom">
      <id>2</id>
      <email>tom@125.com</email>
      <address>china</address>
      <birthday id="6" 生日="2010-11-22"/>
    </student>
  </list>
</beans>

3. 在JavaBean中添加Annotation注解进行重命名设置

（1）JavaBean代码：@H_301_5@

@H_301_5@ 

@XStreamAlias("class")
public class Classes {

	@XStreamAsAttribute
	@XStreamAlias("名称")
	private String name;

	@XStreamOmitField
	private int number;

	@XStreamImplicit(itemFieldName = "Students")
	private List<Student> students;

	@XStreamConverter(SingleValueCalendarConverter.class)
	private Calendar created = new GregorianCalendar();

	public Classes() {
	}

	public Classes(String name,Student... stu) {
		this.name = name;
		this.students = Arrays.asList(stu);
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getNumber() {
		return number;
	}

	public void setNumber(int number) {
		this.number = number;
	}

	public List<Student> getStudents() {
		return students;
	}

	public void setStudents(List<Student> students) {
		this.students = students;
	}

	public Calendar getCreated() {
		return created;
	}

	public void setCreated(Calendar created) {
		this.created = created;
	}
	
}

（2）编写类型转换器：@H_301_5@

@H_301_5@ 

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;
	}

	public boolean canConvert(Class type) {
		return type.equals(GregorianCalendar.class);
	}
}

（3）测试代码：

@H_301_5@ 

/**
	 * 使用注解将List转为XML文档
	 */
	@Test
	public void writeList2XML4Annotation() {
		try {
			highLight("====== annotation Bean --> XML ======");
			Student stu = new Student();
			stu.setName("jack");
			Classes c = new Classes("一班",student,stu);
			c.setNumber(2);
			xstream.alias("student",Student.class);
			print(xstream.toXML(c));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
运行结果：

@H_301_5@ 

====== annotation Bean --> XML ======
<com.zdp.domain.Classes>
  <name>一班</name>
  <number>2</number>
  <students class="java.util.Arrays$ArrayList">
    <a class="student-array">
      <student>
        <id>1</id>
        <name>jack</name>
        <email>jack@email.com</email>
        <address>china</address>
        <birthday>
          <birthday>2010-11-22</birthday>
        </birthday>
      </student>
      <student>
        <id>0</id>
        <name>jack</name>
      </student>
    </a>
  </students>
  <created>
    <time>1409821431920</time>
    <timezone>Asia/Shanghai</timezone>
  </created>
</com.zdp.domain.Classes>

4. 将Map集合转成xml文档：

@H_301_5@ 

/**
	 * 将Map集合转成XML文档
	 */
	@Test
	public void writeMap2XML() {
		try {
			highLight("====== Map --> XML ======");
			Map<String,Student> map = new HashMap<String,Student>();
			map.put("No.1",student);

			student = new Student();
			student.setAddress("china");
			student.setEmail("tom@125.com");
			student.setId(2);
			student.setName("tom");
			Birthday day = new Birthday("2010-11-22");
			student.setBirthday(day);
			map.put("No.2",student);

			student = new Student();
			student.setName("jack");
			map.put("No.3",student);

			xstream.alias("student",Student.class);
			xstream.alias("key",String.class);
			xstream.useAttributeFor(Student.class,"id");
			xstream.useAttributeFor("birthday",String.class);
			print(xstream.toXML(map));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
运行结果：

@H_301_5@ 

====== Map --> XML ======
<map>
  <entry>
    <key>No.3</key>
    <student id="0">
      <name>jack</name>
    </student>
  </entry>
  <entry>
    <key>No.1</key>
    <student id="1">
      <name>jack</name>
      <email>jack@email.com</email>
      <address>china</address>
      <birthday birthday="2010-11-22"/>
    </student>
  </entry>
  <entry>
    <key>No.2</key>
    <student id="2">
      <name>tom</name>
      <email>tom@125.com</email>
      <address>china</address>
      <birthday birthday="2010-11-22"/>
    </student>
  </entry>
</map>

5.用OutStream输出流写XML

@H_301_5@ 

/**
	 * 用OutStream输出流写XML
	 */
	@Test
	public void writeXML4OutStream() {
		try {
			out = xstream.createObjectOutputStream(System.out);
			Student stu = new Student();
			stu.setName("jack");
			Classes c = new Classes("一班",stu);
			c.setNumber(2);
			highLight("====== 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();
		}
	}
运行结果：

@H_301_5@ 

====== ObjectOutputStream ## JavaObject--> XML ======
<object-stream>
  <com.zdp.domain.Student>
    <id>0</id>
    <name>jack</name>
  </com.zdp.domain.Student>
  <com.zdp.domain.Birthday>
    <birthday>2010-05-33</birthday>
  </com.zdp.domain.Birthday>
  <byte>22</byte>
  <boolean>true</boolean>
  <float>22.0</float>
  <string>hello</string>
</object-stream>


@H_301_5@

四. xml文档转为Java对象：@H_301_5@

1. 用inputStream将XML文档转换为Java对象@H_301_5@

@H_301_5@ 

/**
	 * 用InputStream将XML文档转换成java对象 
	 */
	@Test
	public void readXML4InputStream() {
	    try {
	        String s = "<object-stream><com.zdp.domain.Student><id>0</id><name>jack</name>" +
	          "</com.zdp.domain.Student><com.zdp.domain.Birthday><birthday>2010-05-33</birthday>" +
	          "</com.zdp.domain.Birthday><byte>22</byte><boolean>true</boolean><float>22.0</float>" +
	          "<string>hello</string></object-stream>";
	        highLight("====== 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();
	    }
	}
运行结果：

@H_301_5@ 

====== ObjectInputStream## XML --> javaObject ======
jack#0#null#null#null
com.zdp.domain.Birthday@27391d
22
true
22.0
hello

2. 将XML文档转为Java对象：

@H_301_5@ 

/**
	 * 将XML文档转换成Java对象
	 */
	@Test
	public void readXml2Object() {
	    try {
	        highLight("====== Xml >>> Bean ======");
	        Student stu = (Student) xstream.fromXML(xstream.toXML(student));
	        print(stu.toString());
	        
	        List<Student> list = new ArrayList<Student>();
	        list.add(student);//add
	        
	        Map<String,Student>();
	        map.put("No.1",student);//put
	        
	        student = new Student();
	        student.setAddress("china");
	        student.setEmail("tom@125.com");
	        student.setId(2);
	        student.setName("tom");
	        Birthday day = new Birthday("2010-11-22");
	        student.setBirthday(day);
	        list.add(student);//add
	        map.put("No.2",student);//put
	        
	        student = new Student();
	        student.setName("jack");
	        list.add(student);//add
	        map.put("No.3",student);//put
	        
	        highLight("====== XML >>> List ======"); 
	        List<Student> studetns = (List<Student>) xstream.fromXML(xstream.toXML(list));
	        print("size:" + studetns.size());//3
	        for (Student s : studetns) {
	            print(s.toString());
	        }
	        
	        highLight("====== XML >>> Map ======");
	        Map<String,Student> maps = (Map<String,Student>) xstream.fromXML(xstream.toXML(map));
	        print("size:" + maps.size());//3
	        Set<String> key = maps.keySet();
	        Iterator<String> iter = key.iterator();
	        while (iter.hasNext()) {
	            String k = iter.next();
	            print(k + ":" + map.get(k));
	        }
	    } catch (Exception e) {
	        e.printStackTrace();
	    }
	}
运行结果：

@H_301_5@ 

====== Xml >>> Bean ======
jack#1#china#com.zdp.domain.Birthday@1125127#jack@email.com
====== XML >>> List ======
size:3
jack#1#china#com.zdp.domain.Birthday@134bed0#jack@email.com
tom#2#china#com.zdp.domain.Birthday@1db4f6f#tom@125.com
jack#0#null#null#null
====== XML >>> Map ======
size:3
No.3:jack#0#null#null#null
No.1:jack#1#china#com.zdp.domain.Birthday@1d520c4#jack@email.com
No.2:tom#2#china#com.zdp.domain.Birthday@2a5330#tom@125.com

五. 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
@H_301_5@

1.用JettisonMappedXmlDriver完成Java对象到JSON的转换@H_301_5@

@H_301_5@ 

/**
	 * XStream结合JettisonMappedXmlDriver驱动，转换Java对象到JSON
	 */
	@Test
	public void writeEntity2JETTSON() {
	    highLight("====== JettisonMappedXmlDriver === JavaObject >>>> JaonString ======");
	    xstream = new XStream(new JettisonMappedXmlDriver());
	    xstream.setMode(XStream.NO_REFERENCES);
	    xstream.alias("student",Student.class);
	    print(xstream.toXML(student));
	}
运行结果：

@H_301_5@ 

====== JettisonMappedXmlDriver === JavaObject >>>> JaonString ======
{"student":{"id":1,"name":"jack","email":"jack@email.com","address":"china","birthday":[{},"2010-11-22"]}}

2. 用JsonHierarchicalStreamDriver完成Java对象到JSON的转换@H_301_5@ 

/**
	 * 转换java对象为JSON字符串
	 */
	@Test
	public void writeEntiry2JSON() {
	    highLight("====== JsonHierarchicalStreamDriver === JavaObject >>>> JaonString ======");
	    xstream = new XStream(new JsonHierarchicalStreamDriver());
	    xstream.alias("student",Student.class);
	    highLight("-------Object >>>> JSON---------");
	    print(xstream.toXML(student));
	    
	    //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);
	    print(xstream.toXML(student));
	}
运行结果： 
====== JsonHierarchicalStreamDriver === JavaObject >>>> JaonString ======
-------Object >>>> JSON---------
{"student": {
  "id": 1,"name": "jack","email": "jack@email.com","address": "china","birthday": {
    "birthday": "2010-11-22"
  }
}}
{
  "id": 1,"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，@H_301_5@

你可以重写createWriter方法，删掉根节点。
@H_301_5@


@H_301_5@

3.将List集合转换成JSON串@H_301_5@

@H_301_5@ 

/**
	 * 将List集合转换成JSON字符串
	 */
	@Test
	public void writeList2JSON() {
	    highLight("===== 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<Student> list = new ArrayList<Student>();
	    list.add(student);
	    
	    student = new Student();
	    student.setAddress("china");
	    student.setEmail("tom@125.com");
	    student.setId(2);
	    student.setName("tom");
	    Birthday day = new Birthday("2010-11-22");
	    student.setBirthday(day);
	    list.add(student);
	    
	    student = new Student();
	    student.setName("jack");
	    list.add(student);
	    
	    print(xstream.toXML(list));
	    
	    //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);
	    print(xstream.toXML(list));
	}
运行结果：

@H_301_5@ 

===== JsonHierarchicalStreamDriver ==== JavaObject >>>> JaonString =====
{"list": [
  {
    "id": 1,"birthday": {
      "birthday": "2010-11-22"
    }
  },{
    "id": 2,"name": "tom","email": "tom@125.com",{
    "id": 0,"name": "jack"
  }
]}
[
  {
    "id": 1,"name": "jack"
  }
]

4. 将Map转换成json串：@H_301_5@

@H_301_5@ 

/**
	 * 将Map集合转换成JSON字符串
	 */
	@Test
	public void writeMap2JSON() {
	    highLight("==== JsonHierarchicalStreamDriver ==== Map >>>> JaonString =====");
	    xstream = new XStream(new JsonHierarchicalStreamDriver());
	    xstream.alias("student",Student.class);
	    
	    Map<String,Student>();
	    map.put("No.1",student);
	    
	    student = new Student();
	    student.setAddress("china");
	    student.setEmail("tom@125.com");
	    student.setId(2);
	    student.setName("tom");
	    student.setBirthday(new Birthday("2010-11-21"));
	    map.put("No.2",student);
	    
	    student = new Student();
	    student.setName("jack");
	    map.put("No.3",student);
	    
	    print(xstream.toXML(map));
	    
	    //删除根节点
	    xstream = new XStream(new JsonHierarchicalStreamDriver() {
	        public HierarchicalStreamWriter createWriter(Writer out) {
	            return new JsonWriter(out,JsonWriter.DROP_ROOT_MODE);
	        }
	    });
	    xstream
运行结果：

@H_301_5@ 

==== JsonHierarchicalStreamDriver ==== Map >>>> JaonString =====
{"map": [
  [
    "No.3",{
      "id": 0,"name": "jack"
    }
  ],[
    "No.1",{
      "id": 1,"birthday": {
        "birthday": "2010-11-22"
      }
    }
  ],[
    "No.2",{
      "id": 2,"birthday": {
        "birthday": "2010-11-21"
      }
    }
  ]
]}
[
  [
    "No.3","birthday": {
        "birthday": "2010-11-21"
      }
    }
  ]
]


@H_301_5@

5. 将JSON转换成Java对象：@H_301_5@

@H_301_5@ 

/**
	 * 将JSON字符串转换成java对象
	 */
	@Test
	public void readJSON2Object() throws JSONException {
	    String json = "{student: {" +
	        "id: 1," +
	        "name: haha," +
	        "email: email," +
	        "address: address," +
	        "birthday: {" +
	           "birthday: 2010-11-22 " +
	        "}" +
	    "}}";
	    xstream = new XStream(new JettisonMappedXmlDriver());
	    xstream.alias("student",Student.class);
	    print(xstream.fromXML(json).toString());
	    
	    json = "{list: [{" +
		            "id: 1," +
		            "name: haha," +
		            "email: email," +
		            "address: address," +
		            "birthday: {" +
		              "birthday: 2010-11-22" +
		            "}" +
	           "},{" +
		            "id: 2," +
		            "name: tom," +
		            "email: tom@125.com," +
		            "address: china," +
		            "birthday: {" +
		              "birthday: 2010-11-22" +
		            "}" +
	             "}" +
	          "]}";
	    System.out.println(json); 
	    List list = (List) xstream.fromXML(json);
	    System.out.println(list.size());
	}
运行结果：

@H_301_5@ 

haha#1#address#com.zdp.domain.Birthday@137c60d#email
{list: [{id: 1,name: haha,email: email,address: address,birthday: {birthday: 2010-11-22}},{id: 2,name: tom,email: tom@125.com,address: china,birthday: {birthday: 2010-11-22}}]}
0


@H_301_5@

@H_301_5@

三. 遇到的问题@H_301_5@

1. 如何加上xml头部？即<?xml version="1.0" encoding="UTF-8"?>@H_301_5@

官方文档是这样解释的:@H_301_5@

Why does XStream not write an XML declaration?
XStream is designed to write XML snippets,so you can embed its output into an existing stream or string.@H_301_5@

You can write the XML declaration yourself into the Writer before using it to call XStream.toXML(writer).
@H_301_5@ 我们可以自己添加：XmlDeclarationXStream

@H_301_5@ 

public class XmlDeclarationXStream extends XStream {
	private String version;

	private String ecoding;

	public XmlDeclarationXStream() {
		this("1.0","utf-8");
	}

	public XmlDeclarationXStream(String version,String ecoding) {
		this.version = version;
		this.ecoding = ecoding;
	}

	public String getDeclaration() {
		return "<?xml version=\"" + this.version + "\" encoding=\"" + this.ecoding + "\"?>";
	}

	@Override
	public void toXML(Object obj,OutputStream output) { 
		try {
			String dec = this.getDeclaration();
			byte[] bytesOfDec = dec.getBytes(this.ecoding);
			output.write(bytesOfDec);
		} catch (Exception e) {
			throw new RuntimeException("error happens",e);
		}
		super.toXML(obj,output);
	}

	@Override
	public void toXML(Object obj,Writer writer) {
		try {
			writer.write(getDeclaration()); 
		} catch (Exception e) {
			throw new RuntimeException("error happens",writer);
	}
}
测试的时候我们new这个类：XStream xstream = new XmlDeclarationXStream();

源码下载：http://download.csdn.net/detail/zdp072/7866129@H_301_5@

原文：http://blog.csdn.net/IBM_hoojo/article/details/6342386@H_301_5@

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