xtream demo

1 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；
官网：
http://xstream.codehaus.org/

2 about xtream
xtream  是一个简单的工具包，用来把对象序列化成xml配置文件，并且也可以把xml反序化成对象。

4Features 功能特点
简单易用，不需要配置映射，速度快并且占用内存小，生成的xml配置文件很干净，不带额外无用信息，这样在反映序列化的时候容易读取。不需要修改序列化对象的类型。支持类图。与xmlapi 整合。详细的返回错误信息。可修改的输出 显示。

4 点型应用
传输：网络传输
持久化：生成的XML可以写到文件，做持久化。
配置：XML最常用的配置文件。
单元测试

5局限
If using the enhanced mode, XStream can re-instantiate classes that do not have a default constructor. However, if using a different JVM like an old JRockit version, a JDK 1.3 or you have restrictions because of a SecurityManager, a default constructor is required.
The enhanced mode is also necessary to restore final fields for any JDK < 1.5. This implies deserialization of instances of an inner class.
Auto-detection of annotations may cause race conditions. Preprocessing annotations is safe though.

6准备一个pojo对象

package com.entity;

import java.util.Date;

public class Student {
	private int id;
	private String name;

	private String email;
	private String address;
	private Birthday birthday;
	private Date registDate;
	
	public Date getRegistDate() {
		return registDate;
	}

	public void setRegistDate(Date registDate) {
		this.registDate = registDate;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public Birthday getBirthday() {
		return birthday;
	}

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

	// getter、setter
	public String toString() {
		return this.name + "#" + this.id + "#" + this.address + "#"
				+ this.birthday + "#" + this.email;
	}
}

7 bean 转成 xml

测试代码：

package com.test;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Date;

import org.junit.Before;
import org.junit.Test;

import com.entity.Birthday;
import com.entity.Student;
import com.thoughtworks.xstream.XStream;

@SuppressWarnings("unchecked")
public class XStreamTest {

	private XStream xstream = null;
	private ObjectOutputStream out = null;
	private ObjectInputStream in = null;

	private Student bean = null;

	@Before
	public void init() {
		try {
			xstream = new XStream();
			bean = getTestStudent();
			// xstream = new XStream(new DomDriver()); // 需要xpp3 jar
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		XStreamTest test = new XStreamTest();
		test.init();
		test.testWriteBean2XML_01();
	}

	public final void fail(String string) {
		System.out.println(string);
	}

	public final void failRed(String string) {
		System.err.println(string);
	}

	/**
	 * bean 2 XML
	 * */
	@Test
	public void testWriteBean2XML_01() {
		try {
			fail("------------Bean->XML------------");
			fail(xstream.toXML(bean));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 类重命名后的XML
	 * */
	@Test
	public void testWriteBean2XML_02() {
		try {
			fail("-----------类重命名后的XML------------");
			// 类重命名
			xstream.alias("student", Student.class);
			xstream.aliasField("生日", Student.class, "birthday");
			xstream.aliasField("生日日期", Birthday.class, "birthday");
			fail(xstream.toXML(bean));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 类重命名后的XML
	 * */
	@Test
	public void testWriteBean2XML_03() {
		try {
			fail("-----------属性重命名后的XML------------");
			// 属性重命名
			xstream.aliasField("邮件", Student.class, "email");
			fail(xstream.toXML(bean));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 包重命名后的XML
	 * */
	@Test
	public void testWriteBean2XML_04() {
		try {
			fail("-----------包重命名后的XML------------");
			//包重命名
			xstream.aliasPackage("modile", "com.entity");
			fail(xstream.toXML(bean));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 构造数据
	 * */
	private Student getTestStudent() {
		Student 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);
		bean.setRegistDate(new Date());
		return bean;
	}
}

测试结果：
------------Bean->XML------------
<com.entity.Student>
  <id>1</id>
  <name>jack</name>
  <email>[email protected]</email>
  <address>china</address>
  <birthday>
    <birthday>2010-11-22</birthday>
  </birthday>
  <registDate>2011-07-11 22:33:02.359 CST</registDate>
</com.entity.Student>
-----------类重命名后的XML------------
<student>
  <id>1</id>
  <name>jack</name>
  <email>[email protected]</email>
  <address>china</address>
  <生日>
    <生日日期>2010-11-22</生日日期>
  </生日>
  <registDate>2011-07-11 22:33:02.390 CST</registDate>
</student>
-----------属性重命名后的XML------------
<com.entity.Student>
  <id>1</id>
  <name>jack</name>
  <邮件>[email protected]</邮件>
  <address>china</address>
  <birthday>
    <birthday>2010-11-22</birthday>
  </birthday>
  <registDate>2011-07-11 22:33:02.406 CST</registDate>
</com.entity.Student>
-----------包重命名后的XML------------
<modile.Student>
  <id>1</id>
  <name>jack</name>
  <email>[email protected]</email>
  <address>china</address>
  <birthday>
    <birthday>2010-11-22</birthday>
  </birthday>
  <registDate>2011-07-11 22:33:02.406 CST</registDate>
</modile.Student>

8 List 2 XML

			fail("------------Listg<Strudent>->XML------------");
			List<Student> list = new ArrayList<Student>();
			list.add(bean);
			Student s1 = getTestStudent();
			s1.setId(2);
			list.add(s1);
			fail(xstream.toXML(list));

结果：
------------Listg<Strudent>->XML------------
<list>
  <com.entity.Student>
    <id>1</id>
    <name>jack</name>
    <email>[email protected]</email>
    <address>china</address>
    <birthday>
      <birthday>2010-11-22</birthday>
    </birthday>
    <registDate>2011-07-11 22:47:08.0 CST</registDate>
  </com.entity.Student>
  <com.entity.Student>
    <id>2</id>
    <name>jack</name>
    <email>[email protected]</email>
    <address>china</address>
    <birthday>
      <birthday>2010-11-22</birthday>
    </birthday>
    <registDate>2011-07-11 22:47:08.0 CST</registDate>
  </com.entity.Student>
</list>