XStream是一个简单的类库，可以序列化对象到xml，还可以将xml还原为对象。
XStream官网： http://xstream.codehaus.org/
附件提供XStream和xpp3相关的jar下载：
xstream-1.2.2.jar
xpp3-1.1.3.3_min.jar
为了使用XStream，需要对其初始化，初始化方法有两种：
· XStream xstream = new XStream(); 这种方式的初始化需要xpp3-[version].jar的支持。xpp是一个快速解析XML文件的解析器。
· XStream xstream = new XStream(new DomDriver()); XStream xStream = new XStream(new DomDriver("utf-8")) 这种方式不需要 XPP3.jar的支持,它是使用标准的JAXP DOM来解析它
应：ejbtimer的要求增加了数组对象的序列化测试，不过我测试时没有设置mode参数也可以正常序列化。
同时这里对mode参数做个简单的说明：
在XStream序列化或反序列化对象时，它会创建两个类MarshallingContext和UnmarshallingContext，由它们来处理数据，以及委派合适的转换器。XStream提供了三对上下文的缺省实现，它们之间有着细微的差别。缺省值可以通过方法XStream.setMode()来改变，需要传递下面参数中的一个：
· XStream.XPATH_RELATIVE_REFERENCES：(缺省)通过XPath引用来标识重复的引用,使用相对路径表示。
· XStream.XPATH_ABSOLUTE_REFERENCES：通过XPath引用来标识重复的引用,使用绝对路径表示。
· XStream.ID_REFERENCES：使用ID引用来标识重复的引用。在一些场合（手写XML时），将会更易于操作
· XStream.NO_REFERENCES：这种情况将失去对图形对象的支持，仅把对象看作为树型结构。重复的引用被视作两个不同的对象，循环引用会导致异常产生。相对于上面两种模式，这种模式速度会更快，占用内存会更
下面简单的例子包括三个类：UserBean.java,ContactBean.java,XstreamTestMain.java代码如下：
xstream测试类: XstreamTestMain.java
package michael.xstream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
/**
* Xtream 序列化及反序列化
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class XtreamTestMain {
/**
* @param args
*/
public static void main(String[] args) {
UserBean userBean = initBean();
// 依懒xpp解析器
// XStream xStream = new XStream();
// 运用标准的DOM解析器
// XStream xStream = new XStream(new DomDriver());
// 指定编码格式
XStream xStream = new XStream(new DomDriver("utf-8"));
// xStream.setMode(XStream.NO_REFERENCES);
// 直接指定修改生成XML的节点名称
xStream.alias("UserBean", UserBean.class);
String xml = xStream.toXML(userBean);
System.out.println("BEAN转化为XML 字符串-----------------------------");
System.out.println(xml);
System.out.println("XML转化为BEAN-----------------------------");
UserBean parseBean = (UserBean) xStream.fromXML(xml);
System.out.println("userName:" + parseBean.getUserName());
System.out.println("age:" + parseBean.getAge());
System.out.println("birthday:" + parseBean.getBirthday());
for (String str : parseBean.getAddresList()) {
System.out.println("addres:" + str);
}
for (Entry<String, String> entry : parseBean.getNickNameMap()
.entrySet()) {
System.out.println("nick name:" + entry.getKey() + "<->"
+ entry.getValue());
}
ContactBean contact = parseBean.getContact();
System.out.println("postcode:" + contact.getPostCode());
System.out.println("telephone:" + contact.getTelephone());
System.out.println("mobile:" + contact.getMobile());
System.out.println("email:" + contact.getEmail());
System.out.println("BEAN转化为XML文件-----------------------------");
try {
FileOutputStream fos = new FileOutputStream("d:/test/userbean.xml");
xStream.toXML(userBean, fos);
} catch (Exception ex) {
ex.printStackTrace();
}
System.out.println("XML文件转化为BEAN-----------------------------");
UserBean parseFileBean = new UserBean();
try {
FileInputStream fis = new FileInputStream("d:/test/userbean.xml");
parseFileBean = (UserBean) xStream.fromXML(fis, parseFileBean);
System.out.println("parseFileBean->" + parseFileBean);
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* @return test bean
*/
private static UserBean initBean() {
ContactBean contact = new ContactBean();
contact.setPostCode("200000");
contact.setTelephone("021-88888888");
contact.setMobile("1891800xxxx");
contact.setEmail("[email protected]");
List<String> addressList = new ArrayList<String>();
addressList.add("上海杨浦");
addressList.add("江苏苏州");
Map<String, String> nickNameMap = new HashMap<String, String>();
nickNameMap.put("大大", "小小");
nickNameMap.put("老公", "老婆");
UserBean userBean = new UserBean();
userBean.setUserName("michael");
userBean.setAge(26);
userBean.setBirthday(new Date());
userBean.setAddresList(addressList);
userBean.setNickNameMap(nickNameMap);
userBean.setContact(contact);
ContactBean contact1 = new ContactBean();
contact1.setPostCode("200011");
contact1.setTelephone("021-11111111");
contact1.setMobile("13911111111");
contact1.setEmail("[email protected]");
ContactBean contact2 = new ContactBean();
contact2.setPostCode("20002");
contact2.setTelephone("021-22222222");
contact2.setMobile("13922222222");
contact2.setEmail("[email protected]");
ContactBean[] contactArr = new ContactBean[] { contact1, contact2 };
userBean.setContactArr(contactArr);
return userBean;
}
}
测试UserBean:UserBean.java
package michael.xstream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @author Michael
*/
public class UserBean {
/**
* 用户名称
*/
private String userName;
/**
* 年龄
*/
private Integer age;
/**
* 出生日期
*/
private Date birthday;
/**
* 地址
*/
private List<String> addresList = new ArrayList<String>();
/**
* 昵称
*/
private Map<String, String> nickNameMap = new HashMap<String, String>();
/**
* 联系方式Bean
*/
private ContactBean contact;
/**
* 测试对象数组
*/
private ContactBean[] contactArr;
/**
* @return the userName
*/
public String getUserName() {
return userName;
}
/**
* @return the age
*/
public Integer getAge() {
return age;
}
/**
* @return the birthday
*/
public Date getBirthday() {
return birthday;
}
/**
* @return the addresList
*/
public List<String> getAddresList() {
return addresList;
}
/**
* @return the nickNameMap
*/
public Map<String, String> getNickNameMap() {
return nickNameMap;
}
/**
* @return the contact
*/
public ContactBean getContact() {
return contact;
}
/**
* @param pUserName the userName to set
*/
public void setUserName(String pUserName) {
userName = pUserName;
}
/**
* @param pAge the age to set
*/
public void setAge(Integer pAge) {
age = pAge;
}
/**
* @param pBirthday the birthday to set
*/
public void setBirthday(Date pBirthday) {
birthday = pBirthday;
}
/**
* @param pAddresList the addresList to set
*/
public void setAddresList(List<String> pAddresList) {
addresList = pAddresList;
}
/**
* @param pNickNameMap the nickNameMap to set
*/
public void setNickNameMap(Map<String, String> pNickNameMap) {
nickNameMap = pNickNameMap;
}
/**
* @param pContact the contact to set
*/
public void setContact(ContactBean pContact) {
contact = pContact;
}
/**
* @return the contactArr
*/
public ContactBean[] getContactArr() {
return contactArr;
}
/**
* @param pContactArr the contactArr to set
*/
public void setContactArr(ContactBean[] pContactArr) {
contactArr = pContactArr;
}
}
测试ContactBean :ContactBean.java
package com.test;
/**
* @author Michael
*/
public class ContactBean {
/**
* 邮编
*/
private String postCode;
/**
* 电话
*/
private String telephone;
/**
* 手机
*/
private String mobile;
/**
* email
*/
private String email;
/**
* @return the postCode
*/
public String getPostCode() {
return postCode;
}
/**
* @return the telephone
*/
public String getTelephone() {
return telephone;
}
/**
* @return the mobile
*/
public String getMobile() {
return mobile;
}
/**
* @return the email
*/
public String getEmail() {
return email;
}
/**
* @param pPostCode the postCode to set
*/
public void setPostCode(String pPostCode) {
postCode = pPostCode;
}
/**
* @param pTelephone the telephone to set
*/
public void setTelephone(String pTelephone) {
telephone = pTelephone;
}
/**
* @param pMobile the mobile to set
*/
public void setMobile(String pMobile) {
mobile = pMobile;
}
/**
* @param pEmail the email to set
*/
public void setEmail(String pEmail) {
email = pEmail;
}
}
运行测试代码，打印结果如下：
引用
BEAN转化为XML 字符串-----------------------------
<UserBean>
<userName>michael</userName>
<age>26</age>
<birthday>2011-07-20 23:33:32.969 CST</birthday>
<addresList>
<string>上海杨浦</string>
<string>江苏苏州</string>
</addresList>
<nickNameMap>
<entry>
<string>老公</string>
<string>老婆</string>
</entry>
<entry>
<string>大大</string>
<string>小小</string>
</entry>
</nickNameMap>
<contact>
<postCode>200000</postCode>
<telephone>021-88888888</telephone>
<mobile>1891800xxxx</mobile>
<email>[email protected]</email>
</contact>
<contactArr>
<michael.xstream.ContactBean>
<postCode>200011</postCode>
<telephone>021-11111111</telephone>
<mobile>13911111111</mobile>
<email>[email protected]</email>
</michael.xstream.ContactBean>
<michael.xstream.ContactBean>
<postCode>20002</postCode>
<telephone>021-22222222</telephone>
<mobile>13922222222</mobile>
<email>[email protected]</email>
</michael.xstream.ContactBean>
</contactArr>
</UserBean>
XML转化为BEAN-----------------------------
userName:michael
age:26
birthday:Wed Jul 20 23:33:32 CST 2011
addres:上海杨浦
addres:江苏苏州
nick name:老公<->老婆
nick name:大大<->小小
postcode:200000
telephone:021-88888888
mobile:1891800xxxx
email:[email protected]
BEAN转化为XML文件-----------------------------
XML文件转化为BEAN-----------------------------
parseFileBean->michael.xstream.UserBean@bf7190
生成的XML文件userbean.xml：
<UserBean>
<userName>michael</userName>
<age>26</age>
<birthday>2011-07-20 23:33:32.969 CST</birthday>
<addresList>
<string>上海杨浦</string>
<string>江苏苏州</string>
</addresList>
<nickNameMap>
<entry>
<string>老公</string>
<string>老婆</string>
</entry>
<entry>
<string>大大</string>
<string>小小</string>
</entry>
</nickNameMap>
<contact>
<postCode>200000</postCode>
<telephone>021-88888888</telephone>
<mobile>1891800xxxx</mobile>
<email>[email protected]</email>
</contact>
<contactArr>
<michael.xstream.ContactBean>
<postCode>200011</postCode>
<telephone>021-11111111</telephone>
<mobile>13911111111</mobile>
<email>[email protected]</email>
</michael.xstream.ContactBean>
<michael.xstream.ContactBean>
<postCode>20002</postCode>
<telephone>021-22222222</telephone>
<mobile>13922222222</mobile>
<email>[email protected]</email>
</michael.xstream.ContactBean>
</contactArr>
</UserBean>
到此测试例子结束，是不是觉得很方便啊，吼吼