xtream 示例介绍

详见：http://blog.yemou.net/article/query/info/tytfjhfascvhzxcyt271

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 

Java代码

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package com.entity;  
import java.util.Date;  
bpublic 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： 

Java代码

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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");
        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------------ 

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<com.entity.Student>    <id>1</id>    <name>jack</name>    <email>email</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------------ 

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<student>    <id>1</id>    <name>jack</name>    <email>email</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------------ 

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<com.entity.Student>    <id>1</id>    <name>jack</name>    <邮件>email</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------------ 

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<modile.Student>    <id>1</id>    <name>jack</name>    <email>e</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 

Java代码  

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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------------ 

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<list>    <com.entity.Student>      <id>1</id>      <name>jack</name>      <email>email</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</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>