XStream-----把JavaBean转换为xml的工具

  1 import java.util.ArrayList;
  2 import java.util.List;
  3 import org.junit.Test;
  4 import com.thoughtworks.xstream.XStream;
  5 /**
  6  * 演示XStream
  7  */
  8 public class Demo1 {
  9     // 返回javabean集合
 10     public List<Province> getProinvceList() {
 11         Province p1 = new Province();
 12         p1.setName("北京");
 13         p1.addCity(new City("东城区", "DongChengQu"));
 14         p1.addCity(new City("昌平区", "ChangPingQu"));
 15         Province p2 = new Province();
 16         p2.setName("辽宁");
 17         p2.addCity(new City("沈阳", "shenYang"));
 18         p2.addCity(new City("葫芦岛", "huLuDao"));
 19         List<Province> provinceList = new ArrayList<Province>();
 20         provinceList.add(p1);
 21         provinceList.add(p2);
 22         return provinceList;
 23     }
 24     @Test
 25     public void fun1() {
 26         List<Province> proList = getProinvceList();
 27         /*
 28          * 创建XStream对象
 29          * 调用toXML把集合转换成xml字符串
 30          */
 31         XStream xstream = new XStream();
 32         String s = xstream.toXML(proList);
 33         System.out.println(s);
 34     }
 35     /*
 36      * 别名(alias)
 37      * 希望：
 38      * * 默认List类型对应<list>元素，希望让List类型对应<china>元素
 39      * * 默认Province类型对应<cn.itcast.demo1.Province>，希望让它对应<province>
 40      * * 默认City类型对应<cn.itcast.demo1.City>，希望它对应<city>元素
 41      */
 42     @Test
 43     public void fun2() {
 44         List<Province> proList = getProinvceList();
 45         XStream xstream = new XStream();
 46         /*
 47          * 给指定的类型指定别名
 48          */
 49         xstream.alias("china", List.class);//给List类型指定别名为china
 50         xstream.alias("province", Province.class);//给Province指定别名为province
 51         xstream.alias("city", City.class);//给City类型指定别名为city
 52         String s = xstream.toXML(proList);
 53         System.out.println(s);
 54     }
 55     /*
 56      * 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
 57      */
 58     @Test
 59     public void fun3() {
 60         List<Province> proList = getProinvceList();
 61         XStream xstream = new XStream();
 62         xstream.alias("china", List.class);//给List类型指定别名为china
 63         xstream.alias("province", Province.class);//给Province指定别名为province
 64         xstream.alias("city", City.class);//给City类型指定别名为city
 65         /*
 66          * 把Province类型的name属性，生成<province>元素的属性
 67          */
 68         xstream.useAttributeFor(Province.class, "name");
 69         String s = xstream.toXML(proList);
 70         System.out.println(s);        
 71     }
 72     /*
 73      * 去除List类型的属性，只把list中的元素生成xml元素
 74      */
 75     @Test
 76     public void fun4() {
 77         List<Province> proList = getProinvceList();
 78         XStream xstream = new XStream();
 79         xstream.alias("china", List.class);//给List类型指定别名为china
 80         xstream.alias("province", Province.class);//给Province指定别名为province
 81         xstream.alias("city", City.class);//给City类型指定别名为city
 82         xstream.useAttributeFor(Province.class, "name");//把Province类型的name属性，生成<province>元素的属性
 83         /*
 84          * 去除<cities>这样的Collection类型的属性
 85          * 去除Provice类的名为cities的List类型的属性！
 86          */
 87         xstream.addImplicitCollection(Province.class, "cities");
 88         String s = xstream.toXML(proList);
 89         System.out.println(s);        
 90     }
 91     /*
 92      * 去除不想要的javabean属性
 93      * 就是让某引起javabean属性，不生成对应的xml元素！
 94      */
 95     @Test
 96     public void fun5() {
 97         List<Province> proList = getProinvceList();
 98         XStream xstream = new XStream();
 99         xstream.alias("china", List.class);//给List类型指定别名为china
100         xstream.alias("province", Province.class);//给Province指定别名为province
101         xstream.alias("city", City.class);//给City类型指定别名为city
102         xstream.useAttributeFor(Province.class, "name");//把Province类型的name属性，生成<province>元素的属性
103         xstream.addImplicitCollection(Province.class, "cities");//去除Provice类的名为cities的List类型的属性！
104         /*
105          * 让City类的，名为description属性不生成对应的xml元素
106          */
107         xstream.omitField(City.class, "description");
108         String s = xstream.toXML(proList);
109         System.out.println(s);        
110     }
111 }