XStream简介
XStream是一个Java对象与XML互相转换的工具类库。
官网链接: http://x-stream.github.io/index.html
简单使用
下载页面：http://x-stream.github.io/download.html
使用Maven构建项目的加入以下依赖:
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.10</version>
</dependency>创建Bean：
public class User {
private String userName;
private String email;
public User() {}
public User(String userName, String email) {
this.userName = userName;
this.email = email;
}
public String toString() {
return "User:{userName=" + this.userName + ",email=" + this.email + "}";
}
//Getter and Setter...
}
Java对象转XML:
使用xStream.toXML()方法。
public static void main(String[] args) {
User user = new User("lanweihong", "[email protected]");
//创建解析XML对象
XStream xStream = new XStream();
//设置别名, 默认会输出全路径
xStream.alias("User", User.class);
//转为xml
String xml = xStream.toXML(user);
System.out.println(xml);
}转换后的xml文本为：
<User>
<userName>lanweihong</userName>
<email>[email protected]</email>
</User>XML转Java对象
使用xStream.fromXML()方法。
public static void main(String[] args) {
XStream xStream = new XStream();
xStream.alias("User", User.class);
String xml = "<User>\n" +
" <userName>lanweihong</userName>\n" +
" <email>[email protected]</email>\n" +
"</User>";
//转对象
User user = (User)xStream.fromXML(xml);
System.out.println(user.toString());
}输出文本为:
User:{userName=lanweihong,[email protected]}使用注解
最基本的注解@XStreamAlias用于设置字段别名；我们将上述例子创建的User对象添加注解改造一下:
@XStreamAlias("user")
public class User {
@XStreamAlias("username")
private String userName;
@XStreamAlias("email")
private String email;
public User() {}
public User(String userName, String email) {
this.userName = userName;
this.email = email;
}
public String toString() {
return "User:{userName=" + this.userName + ",email=" + this.email + "}";
}
//Getter and Setter...
}XStream默认不会读取这个注解，因为，我们需要声明XStream的注解来源：
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public static void main(String[] args) {
User user = new User("lanweihong", "[email protected]");
XStream xStream = new XStream();
//声明XStream注解来源
xStream.processAnnotations(User.class);
String xml = xStream.toXML(user);
System.out.println(xml);
}输出文本为：
<user>
<username>lanweihong</username>
<email>[email protected]</email>
</user>由此可见，生成的xml节点名称已经变为我们使用@XStreamAlias注解的别名。
简单封装为工具类
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
public class XmlUtils {
/**
* XML转对象
* @param clazz 对象类
* @param str xml字符串
* @param <T> T
* @return
*/
public static <T> T parseFromXml(Class<T> clazz, String xml) {
//创建解析XML对象
XStream xStream = new XStream(new DomDriver());
//处理注解
xStream.processAnnotations(clazz);
@SuppressWarnings("unchecked")
//将XML字符串转为bean对象
T t = (T)xStream.fromXML(xml);
return t;
}
/**
* 对象转xml
* @param obj 对象
* @return
*/
public static String toXml(Object obj) {
XStream xStream = new XStream(new DomDriver());
xStream.processAnnotations(obj.getClass());
return xStream.toXML(obj);
}
}