Xstream 来实习JavaBean转换成XML

1. 什么作用   * 可以把JavaBean转换为（序列化为）xml

2. XStream的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）； 3. 使用步骤   * XStream xstream = new XStream();   * String xmlStr = xstream.toXML(javabean); 4. 使用细节   * 别名：把类型对应的元素名修改了     > xstream.alias("china", List.class)：让List类型生成的元素名为china     > xstream.alias("province", Province.class)：让Province类型生成的元素名为province   * 使用为属性：默认类的成员，生成的是元素的子元素！我们希望让类的成员生成元素的属性     > xstream.useAttributeFor(Province.class, "name")：把Province类的名为name成员，生成<province>元素的name属性   * 去除Collection类型的成名：我们只需要Collection的内容，而不希望Collection本身也生成一个元素     > xstream.addImplicitCollection(Province.class, "cities")：让Province类的名为cities(它是List类型的，它的内容还会生成元素)的成名不生成元素   * 去除类的指定成名，让其不生成xml元素     > xstream.omitField(City.class, "description")：在生成的xml中不会出现City类的名为description的对应的元素！

具体实例

[java] view plain copy package cn.itcast.demo1;    import java.util.ArrayList;  import java.util.List;    import org.junit.Test;    import com.thoughtworks.xstream.XStream;    /**  * 演示XStream  * @author cxf  *  */  public class Demo1 {      // 返回javabean集合      public List<Province> getProinvceList() {          Province p1 = new Province();          p1.setName("北京");          p1.addCity(new City("东城区", "DongChengQu"));          p1.addCity(new City("昌平区", "ChangPingQu"));                    Province p2 = new Province();          p2.setName("辽宁");          p2.addCity(new City("沈阳", "shenYang"));          p2.addCity(new City("葫芦岛", "huLuDao"));                    List<Province> provinceList = new ArrayList<Province>();          provinceList.add(p1);          provinceList.add(p2);                    return provinceList;      }            /** <list> --> List类型显示list   <cn.itcast.demo1.Province> --> javabean的类型为Province，它元素的名称为类的完整名     <name>北京</name> --> javabean的属性名     <cities> --> javabean的属性名       <cn.itcast.demo1.City> --> 类名         <name>东城区</name> --> 属性名         <description>DongChengQu</description> --> 属性名       </cn.itcast.demo1.City>       <cn.itcast.demo1.City>         <name>昌平区</name>         <description>ChangPingQu</description>       </cn.itcast.demo1.City>     </cities>   </cn.itcast.demo1.Province>   <cn.itcast.demo1.Province>     <name>辽宁</name>     <cities>       <cn.itcast.demo1.City>         <name>沈阳</name>         <description>shenYang</description>       </cn.itcast.demo1.City>       <cn.itcast.demo1.City>         <name>葫芦岛</name>         <description>huLuDao</description>       </cn.itcast.demo1.City>     </cities>   </cn.itcast.demo1.Province> </list>      */      @Test      public void fun1() {          List<Province> proList = getProinvceList();          /*          * 创建XStream对象          * 调用toXML把集合转换成xml字符串          */          XStream xstream = new XStream();          String s = xstream.toXML(proList);          System.out.println(s);      }            /*      * 别名(alias)      * 希望：      * * 默认List类型对应<list>元素，希望让List类型对应<china>元素      * * 默认Province类型对应<cn.itcast.demo1.Province>，希望让它对应<province>      * * 默认City类型对应<cn.itcast.demo1.City>，希望它对应<city>元素      */      /* <china>   <province>     <name>北京</name>     <cities>       <city>         <name>东城区</name>         <description>DongChengQu</description>       </city>       <city>         <name>昌平区</name>         <description>ChangPingQu</description>       </city>     </cities>   </province>   <province>     <name>辽宁</name>     <cities>       <city>         <name>沈阳</name>         <description>shenYang</description>       </city>       <city>         <name>葫芦岛</name>         <description>huLuDao</description>       </city>     </cities>   </province> </china>      */      @Test      public void fun2() {          List<Province> proList = getProinvceList();          XStream xstream = new XStream();          /*          * 给指定的类型指定别名          */          xstream.alias("china", List.class);//给List类型指定别名为china          xstream.alias("province", Province.class);//给Province指定别名为province          xstream.alias("city", City.class);//给City类型指定别名为city                              String s = xstream.toXML(proList);          System.out.println(s);      }            /*      * 默认javabean的属性都会生成子元素，而现在希望生成元素的属性      */  /* <china>   <province name="北京">     <cities>       <city>         <name>东城区</name>         <description>DongChengQu</description>       </city>       <city>         <name>昌平区</name>         <description>ChangPingQu</description>       </city>     </cities>   </province>   <province name="辽宁">     <cities>       <city>         <name>沈阳</name>         <description>shenYang</description>       </city>       <city>         <name>葫芦岛</name>         <description>huLuDao</description>       </city>     </cities>   </province>  */      @Test      public void fun3() {          List<Province> proList = getProinvceList();          XStream xstream = new XStream();          xstream.alias("china", List.class);//给List类型指定别名为china          xstream.alias("province", Province.class);//给Province指定别名为province          xstream.alias("city", City.class);//给City类型指定别名为city                              /*          * 把Province类型的name属性，生成<province>元素的属性          */          xstream.useAttributeFor(Province.class, "name");                              String s = xstream.toXML(proList);          System.out.println(s);            }              /*      * 去除List类型的属性，只把list中的元素生成xml元素      */  /* <china>   <province name="北京">     <city>       <name>东城区</name>       <description>DongChengQu</description>     </city>     <city>       <name>昌平区</name>       <description>ChangPingQu</description>     </city>   </province>   <province name="辽宁">     <city>       <name>沈阳</name>       <description>shenYang</description>     </city>     <city>       <name>葫芦岛</name>       <description>huLuDao</description>     </city>   </province> </china>  */      @Test      public void fun4() {          List<Province> proList = getProinvceList();          XStream xstream = new XStream();          xstream.alias("china", List.class);//给List类型指定别名为china          xstream.alias("province", Province.class);//给Province指定别名为province          xstream.alias("city", City.class);//给City类型指定别名为city          xstream.useAttributeFor(Province.class, "name");//把Province类型的name属性，生成<province>元素的属性                              /*          * 去除<cities>这样的Collection类型的属性          * 去除Provice类的名为cities的List类型的属性！          */          xstream.addImplicitCollection(Province.class, "cities");                              String s = xstream.toXML(proList);          System.out.println(s);            }            /**      * 去除不想要的javabean属性      * 就是让某引起javabean属性，不生成对应的xml元素！      */  /* <china>   <province name="北京">     <city>       <name>东城区</name>     </city>     <city>       <name>昌平区</name>     </city>   </province>   <province name="辽宁">     <city>       <name>沈阳</name>     </city>     <city>       <name>葫芦岛</name>     </city>   </province> </china>  */      @Test      public void fun5() {          List<Province> proList = getProinvceList();          XStream xstream = new XStream();          xstream.alias("china", List.class);//给List类型指定别名为china          xstream.alias("province", Province.class);//给Province指定别名为province          xstream.alias("city", City.class);//给City类型指定别名为city          xstream.useAttributeFor(Province.class, "name");//把Province类型的name属性，生成<province>元素的属性          xstream.addImplicitCollection(Province.class, "cities");//去除Provice类的名为cities的List类型的属性！                              /*          * 让City类的，名为description属性不生成对应的xml元素          */          xstream.omitField(City.class, "description");                              String s = xstream.toXML(proList);          System.out.println(s);            }  } 

文章转自：http://blog.csdn.net/JOKER_SAMA/article/details/61197689