XStream（可以把JavaBean转换成XML的小工具）

最新推荐文章于 2023-11-15 12:35:47 发布

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本文介绍了如何使用XStream库将JavaBean对象转换为XML格式，包括添加别名、设置属性为XML元素、忽略不需要的属性等操作，以实现自定义的XML序列化过程。

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1、XStream可以把JavaBean转化为（序列化为）xml

依赖jar包：核心jar包：xstream-1.4.7.jar；必须依赖包：xpp3_min-1.1.4c（XML Pull Parser，一款速度很快的XML解析器）；xstream-benchmark-1.4.7.jar；xstream-hibernate-1.4.7.jar；

2、使用步骤

XStream xstream = new XStream();

String xmlStr = xstream.toXML(javabean);

示例：

import java.util.ArrayList;
import java.util.List;
import com.thoughtworks.xstream.XStream;
public class Testpc {
   public static void main(String[] args) {
       List<Province> proList = getProvinceList() ;
       XStream xstream = new XStream() ;
       //String s = xstream.toXML(proList) ;
       //System.out.println(s);
/*
<list>-->List类型显示list
<com.demo1.Province>-->javabean的类型为Province，它的元素名称为类的完整名
<name>北京</name>-->javabean的属性名
<cities>-->javabean的属性名
<com.demo1.City>
<name>东城区</name>
<des>dongchengqu</des>
</com.demo1.City>
<com.demo1.City>
<name>西城区</name>
<des>xichengqu</des>
</com.demo1.City>
</cities>
</com.demo1.Province>
<com.demo1.Province>
<name>陕西</name>
<cities>
<com.demo1.City>
<name>商洛</name>
<des>shangluo</des>
</com.demo1.City>
<com.demo1.City>
<name>西安</name>
<des>xian</des>
</com.demo1.City>
</cities>
</com.demo1.Province>
</list>
*/
       //别名：<list>修改为<china>；<com.demo1.Province>修改为<province>一类
       xstream.alias("china", List.class);
       xstream.alias("province", Province.class);
       xstream.alias("city", City.class);
       //默认javabean的属性都会生成子元素，但可以指定javabean某属性为XML中元素的属性
       xstream.useAttributeFor(Province.class,"name"); //把Province类中的name属性作为元素属性
       //去除<cities>这样的Collection类型的属性
       xstream.addImplicitCollection(Province.class, "cities");
       //去除不想要的javabean属性
       xstream.omitField(City.class,"des") ;

       String s = xstream.toXML(proList) ;
       System.out.println(s);
/*
<china>
<province name="北京">
<city>
<name>东城区</name>
</city>
<city>
<name>西城区</name>
</city>
</province>
<province name="陕西">
<city>
<name>商洛</name>
</city>
<city>
<name>西安</name>
</city>
</province>
</china>
*/
   }
   public static List<Province> getProvinceList() {
       Province p1 = new Province() ;
       p1.setName("北京");
       p1.addCity(new City("东城区","dongchengqu"));
       p1.addCity(new City("西城区","xichengqu"));

       Province p2 = new Province() ;
       p2.setName("陕西");
       p2.addCity(new City("商洛","shangluo"));
       p2.addCity(new City("西安","xian"));

       List<Province> provinceList = new ArrayList<Province>() ;
       provinceList.add(p1) ;
       provinceList.add(p2) ;

       return provinceList;
   }
}

City.java

public class City {
   private String name ;
   private String des ;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getDes() {
       return des;
   }
   public void setDes(String des) {
       this.des = des;
   }
   public City() {
       super();
   }
   public City(String name, String des) {
       super();
       this.name = name;
       this.des = des;
   }
   @Override
   public String toString() {
       return "City [name=" + name + ", des=" + des + "]";
   }
}
Province.java

import java.util.ArrayList;
import java.util.List;

public class Province {
   private String name ;
   private List<City> cities = new ArrayList<City>() ;
   public void addCity(City city) {
       cities.add(city) ;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public List<City> getCities() {
       return cities;
   }
   public void setCities(List<City> cities) {
       this.cities = cities;
   }
}