java 序列化反序列化xml【使用XStream类库】

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("test@test.com");
       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("contact1@test.com");
       ContactBean contact2 = new ContactBean();
       contact2.setPostCode("20002");
       contact2.setTelephone("021-22222222");
       contact2.setMobile("13922222222");
       contact2.setEmail("contact2@test.com");
       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>test@test.com</email>
        </contact>
        <contactArr>
       <michael.xstream.ContactBean>
       <postCode>200011</postCode>
       <telephone>021-11111111</telephone>
       <mobile>13911111111</mobile>
       <email>contact1@test.com</email>
       </michael.xstream.ContactBean>
       <michael.xstream.ContactBean>
       <postCode>20002</postCode>
       <telephone>021-22222222</telephone>
       <mobile>13922222222</mobile>
       <email>contact2@test.com</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:test@test.com
      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>test@test.com</email>
        </contact>
        <contactArr>
       <michael.xstream.ContactBean>
       <postCode>200011</postCode>
       <telephone>021-11111111</telephone>
       <mobile>13911111111</mobile>
       <email>contact1@test.com</email>
       </michael.xstream.ContactBean>
       <michael.xstream.ContactBean>
       <postCode>20002</postCode>
       <telephone>021-22222222</telephone>
       <mobile>13922222222</mobile>
       <email>contact2@test.com</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
  
 

文章来源: bugstack.blog.csdn.net，作者：Yao__Shun__Yu，版权归原作者所有，如需转载，请联系作者。

原文链接：bugstack.blog.csdn.net/article/details/17397891