Xstream之經常使用方式與經常使用註解

參考資料 
1 xStream框架完美實現Java對象和xml文檔JSON、XML相互轉換 
http://www.cnblogs.com/hoojo/archive/2011/04/22/2025197.html 
2 xStream完美轉換XML、JSON 
http://archive.cnblogs.com/a/2025197/ 
官網:http://xstream.codehaus.org/download.html 
相關jar包可在: 
XStream之初識 
http://liuzidong.iteye.com/blog/1059453下載 
示例代碼 

Java代碼  

1. Blog teamBlog = new Blog(new Author("Guilherme Silveira"));  

2. teamBlog.add(new Entry("first","My first blog entry."));  

3. eamBlog.add(new Entry("tutorial","Today we have developed a nice alias tutorial. Tell your friends! NOW!"));  

4. XStream xstream = new XStream();  

5.  System.out.println(xstream.toXML(teamBlog));  

打印結果爲: 

Java代碼  

1.  <xtream.Blog>  

2.   <writer>  

3.     <name>Guilherme Silveira</name>  

4.   </writer>  

5.   <entries>  

6.     <xtream.Entry>  

7.       <title>first</title>  

8.       <description>My first blog entry.</description>  

9.     </xtream.Entry>  

10.     <xtream.Entry>  

11.       <title>tutorial</title>  

12.       <description>Today we have developed a nice alias tutorial. Tell your friends! NOW!</description>  

13.     </xtream.Entry>  

14.   </entries>  

15. </xtream.Blog>  

以上節點就包含了包名,如包名很長,就很難看了,怎樣才能從新命名這個節點呀！ 
如下的1,2設置效果同樣 

Java代碼  

1. 1 //xstream.aliasPackage("", "xtream");  

2. 2 xstream.alias("blog", Blog.class);  

3. 3 xstream.alias("entry", Entry.class);  

  
經過這樣設置就完成了節點名稱的設置.以下: 

Java代碼  

1. <blog>  

2.   <writer>  

3.     <name>Guilherme Silveira</name>  

4.   </writer>  

5.   <entries>  

6.     <entry>  

7.       <title>first</title>  

8.       <description>My first blog entry.</description>  

9.     </entry>  

10.     <entry>  

11.       <title>tutorial</title>  

12.       <description>Today we have developed a nice alias tutorial. Tell your friends! NOW!</description>  

13.     </entry>  

14.   </entries>  

15. </blog>  

修改子節點屬性名稱 
將writer屬性名稱修改成:autor 

Java代碼  

1. xstream.aliasField("author", Blog.class, "writer");  

輸出以下: 

Java代碼  

1. <blog>  

2.   <author>  

3.     <name>Guilherme Silveira</name>  

4.   </author>  

5.   <entries>  

6.     <entry>  

7.       <title>first</title>  

8.       <description>My first blog entry.</description>  

9.     </entry>  

10.     <entry>  

11.       <title>tutorial</title>  

12.       <description>Today we have developed a nice alias tutorial. Tell your friends! NOW!</description>  

13.     </entry>  

14.   </entries>  

15. </blog>  

刪除集合節點名稱的設置 

Java代碼  

1. xstream.addImplicitCollection(Blog.class, "entries");  

輸出以下: 

Java代碼  

1.  <blog>  

2.   <author>  

3.     <name>Guilherme Silveira</name>  

4.   </author>  

5.   <entry>  

6.     <title>first</title>  

7.     <description>My first blog entry.</description>  

8.   </entry>  

9.   <entry>  

10.     <title>tutorial</title>  

11.     <description>Today we have developed a nice alias tutorial. Tell your friends! NOW!</description>  

12.   </entry>  

13. </blog>  

將Blog類的元素設置爲:它的節點屬性 
//使用這個屬性名做爲節點上的元素 

Java代碼  

1. xstream.useAttributeFor(Blog.class, "writer");  

//從新命名 

Java代碼  

1. xstream.aliasField("author", Blog.class, "writer");  

//註冊轉換器 

Java代碼  

1. xstream.registerConverter(new AuthorConverter());  

轉換器: 

Java代碼  

1. import com.thoughtworks.xstream.converters.SingleValueConverter;  

2. class AuthorConverter implements SingleValueConverter {  

3.     //顯示節點屬性值  

4.     public String toString(Object obj) {  

5.         return ((Author) obj).getName();  

6.     }  

7.   

8.     public Object fromString(String name) {  

9.         return new Author(name);  

10.     }  

11.   

12.     public boolean canConvert(Class type) {  

13.         return type.equals(Author.class);  

14.     }  

15. }  

顯示結果: 

Java代碼  

1. <blog author="Guilherme Silveira">  

2.   <entry>  

3.     <title>first</title>  

4.     <description>My first blog entry.</description>  

5.   </entry>  

6.   <entry>  

7.     <title>tutorial</title>  

8.     <description>Today we have developed a nice alias tutorial. Tell your friends! NOW!</description>  

9.   </entry>  

10. </blog>  

註解的使用方式,使用以前必須加上註解類纔有做用: 

Java代碼  

1. XStream xstream = new XStream();  

2. xstream.processAnnotations(Blog.class);  

3. xstream.processAnnotations(Entry.class);  

1  @XStreamAlias註解可在類與屬性上使用設置名稱,至關於: xstream.alias("blog", Blog.class); 

Java代碼  

1. @XStreamAlias("blog")  

2. public class Blog {   

3.       

4.     @XStreamAlias("author")  

5.         private Author writer;  

6.   

7.     .....  

8. }  

固然Entry類也要設置一樣的類屬性:@XStreamAlias("entity") 
2 @XStreamImplicit去集合節點名:至關於 xstream.addImplicitCollection(Blog.class, "entries"); 
3 @XStreamConverter(AuthorConverter.class),參見以上的轉換器類至關於: 

Java代碼  

1. xstream.useAttributeFor(Blog.class, "writer");  

2. //從新命名  

3. xstream.aliasField("author", Blog.class, "writer");  

4. //註冊轉換器  

5. xstream.registerConverter(new AuthorConverter());  

要使用這個註解AuthorConverter必須符合二個條件 
a 必需要有個默認的無參構造函數 

Java代碼  

1. public AuthorConverter() {  

2.           

3. }  

b 類聲明必須爲:public 

Java代碼  

1. public class AuthorConverter implements SingleValueConverter {  

2.  ...  

3. }  

不用註解這二點均可以不強制要求! 
完整代碼以下: 

Java代碼  

1. import com.thoughtworks.xstream.XStream;  

2. import com.thoughtworks.xstream.annotations.XStreamAlias;  

3. import com.thoughtworks.xstream.annotations.XStreamAsAttribute;  

4. import com.thoughtworks.xstream.annotations.XStreamConverter;  

5. import com.thoughtworks.xstream.annotations.XStreamImplicit;  

6. @XStreamAlias("blog")  

7. public class Blog {  

8.   

9.     @XStreamAsAttribute  

10.     @XStreamAlias("author")  

11.     @XStreamConverter(AuthorConverter.class)  

12.     private Author writer;  

13.   

14.     @XStreamImplicit  

15.     private List entries = new ArrayList();  

16.   

17.     public Blog(Author writer) {  

18.         this.writer = writer;  

19.     }  

20.   

21.     public void add(Entry entry) {  

22.         entries.add(entry);  

23.     }  

24.   

25.     public List getContent() {  

26.         return entries;  

27.     }  

28.   

29.     public static void main(String[] args) {  

30.   

31.         Blog teamBlog = new Blog(new Author("Guilherme Silveira"));  

32.         teamBlog.add(new Entry("first", "My first blog entry."));  

33.         teamBlog  

34.                 .add(new Entry("tutorial",  

35.                         "Today we have developed a nice alias tutorial. Tell your friends! NOW!"));  

36.         XStream xstream = new XStream();  

37.         xstream.processAnnotations(Blog.class);  

38.         xstream.processAnnotations(Entry.class);  

39.         // 從新命名節點名  

40.         // xstream.aliasPackage("", "xtream");  

41.         /* 

42.          * xstream.alias("blog", Blog.class); xstream.alias("entry", 

43.          * Entry.class); //從新命名屬性名 // xstream.aliasField("author", Blog.class, 

44.          * "writer"); //去節點 xstream.addImplicitCollection(Blog.class, 

45.          * "entries"); // xstream.useAttributeFor(Blog.class, "writer"); // 

46.          * xstream.aliasField("author", Blog.class, "writer"); // 

47.          * xstream.addImplicitCollection(Blog.class, "entries"); 

48.          * //使用這個屬性名做爲節點上的元素 xstream.useAttributeFor(Blog.class, "writer"); 

49.          * //從新命名 xstream.aliasField("author", Blog.class, "writer"); //註冊轉換器 

50.          * xstream.registerConverter(new AuthorConverter()); 

51.          */  

52.         System.out.println(xstream.toXML(teamBlog));  

53.     }  

54.   

55. }