XStream序列化JAVA对象为XML以及反序列化

    blog迁移至: http://www.micmiu.com

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



转载请注明来自：Michael's blog @ http://sjsky.iteye.com

----------------------------- 分 ------------------------------ 隔 ------------------------------ 线 ------------------------------