xstream轉換Map和List

廢話不說了，就是不想定義太多的java bean，有時候需求比較簡單，就想著直接用java的集合類來替換太多的java bean定義，看下面的代碼例子

1. package org.garbagecan.xstreamstudy.converter;
3. import java.util.ArrayList;
4. import java.util.HashMap;
5. import java.util.List;
6. import java.util.Map;
8. import com.thoughtworks.xstream.XStream;
9. import com.thoughtworks.xstream.io.xml.DomDriver;
11. public class TestMapListConverter {
12. @SuppressWarnings({ "rawtypes", "unchecked" })
13. public static void main(String[] args) {
14. XStream xstream = new XStream(new DomDriver());
15. Map map = new HashMap();
17. List list1 = new ArrayList();
18. list1.add(new T("a1", "b1", "c1"));
19. list1.add(new T("a2", "b2", "c2"));
20. List list2 = new ArrayList();
21. list2.add(new T("a3", "b3", "c3"));
22. list2.add(new T("a4", "b4", "c4"));
23. map.put("t1", list1);
24. map.put("t2", list2);
26. xstream.alias("classes", Map.class);
27. xstream.alias("class", Map.Entry.class);
28. xstream.alias("name", String.class);
30. xstream.alias("fields", List.class);
31. xstream.alias("field", T.class);
32. xstream.aliasAttribute(T.class, "a", "a");
33. xstream.aliasAttribute(T.class, "b", "b");
34. xstream.aliasAttribute(T.class, "c", "c");
36. System.out.println(xstream.toXML(map));
38. System.out.println((Map)xstream.fromXML(xstream.toXML(map)));
39. }
40. }
42. class T {
43. public T(String a, String b, String c) {
44. this.a = a;
45. this.b = b;
46. this.c = c;
47. }
48. private String a;
49. private String b;
50. private String c;
51. public String getA() {
52. return a;
53. }
54. public void setA(String a) {
55. this.a = a;
56. }
57. public String getB() {
58. return b;
59. }
60. public void setB(String b) {
61. this.b = b;
62. }
63. public String getC() {
64. return c;
65. }
66. public void setC(String c) {
67. this.c = c;
68. }
69. @Override
70. public String toString() {
71. return org.apache.commons.lang.builder.ToStringBuilder.reflectionToString(this);
72. }
73. }

運行上面的例子得到的xml內如如下：

1. <classes>
2. <class>
3. <name>t2</name>
4. <fields>
5. <field a="a3" b="b3" c="c3"/>
6. <field a="a4" b="b4" c="c4"/>
7. </fields>
8. </class>
9. <class>
10. <name>t1</name>
11. <fields>
12. <field a="a1" b="b1" c="c1"/>
13. <field a="a2" b="b2" c="c2"/>
14. </fields>
15. </class>
16. </classes>

1. {t2=[org.garbagecan.xstreamstudy.converter.T@b166b5[a=a3,b=b3,c=c3], org.garbagecan.xstreamstudy.converter.T@1837697[a=a4,b=b4,c=c4]], t1=[org.garbagecan.xstreamstudy.converter.T@1decdec[a=a1,b=b1,c=c1], org.garbagecan.xstreamstudy.converter.T@a1807c[a=a2,b=b2,c=c2]]}