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XStream的基本使用
先准备两个bean
1 public class Book {2 private int bookId;3 private String bookName;4 private String bookCode;5 6 ...(get和set方法省略)7 }
public class BookShelf { private int number; private List<Book> books; private String remark; private Date date; public BookShelf(){ books=new ArrayList<Book>(); } ...(get和set方法省略)}
使用
1 Book book1=new Book(); 2 book1.setBookCode("001"); 3 book1.setBookId(1); 4 book1.setBookName("java编程"); 5 Book book2=new Book(); 6 book2.setBookCode("002"); 7 book2.setBookId(2); 8 book2.setBookName("jsp编程"); 9 BookShelf bookShelf=new BookShelf();10 bookShelf.setNumber(1);11 bookShelf.setRemark("第一个书架");12 bookShelf.getBooks().add(book1);13 bookShelf.getBooks().add(book2);14 bookShelf.setDate(new Date());15 16 XStream xStream=new XStream(new DomDriver());17 String str= xStream.toXML(bookShelf);18 System.out.println(str);
输出结果：
<xml.BookShelf> <number>1</number> <books> <xml.Book> <bookId>1</bookId> <bookName>java编程</bookName> <bookCode>001</bookCode> </xml.Book> <xml.Book> <bookId>2</bookId> <bookName>jsp编程</bookName> <bookCode>002</bookCode> </xml.Book> </books> <remark>第一个书架</remark> <date>2014-07-04 07:03:34.485 UTC</date></xml.BookShelf>
输出的结果里，类名转换为节点名，但前面多了个xml（不爽），时间格式字符串也不爽，那下面就来改造一下吧！
1、先处理一下时间格式问题，这个需要我们自己定义date类型的字段要怎么转换，当然xstream为我们提供了接口，实现它吧
public class MuConverter implements Converter { //判断字段是否属于要转换的类型 @Override public boolean canConvert(Class paramClass) { return Date.class.isAssignableFrom(paramClass); } //对象转化为xml @Override public void marshal(Object object, HierarchicalStreamWriter writer, MarshallingContext context) { SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd"); writer.setValue(format.format(object)); } //xml转化为对象 @Override public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) { try { Date date= DateFormat.getInstance().parse(reader.getValue()); return date; } catch (ParseException e) { return null; } }}
2、为各字段换个名字
xStream.alias("BookShelf", BookShelf.class);xStream.alias("Book", Book.class); //修改节点名称xStream.aliasField("other", BookShelf.class,"remark"); //字段不做为节点，而是属性xStream.aliasAttribute(Book.class, "bookId", "id");xStream.useAttributeFor(Book.class, "bookId"); //去掉集体节点的父节点//xStream.addImplicitCollection(BookShelf.class, "books"); //自定义转换器xStream.registerConverter(new MuConverter());*/输出结果
<BookShelf> <number>1</number> <books> <Book id="1"> <bookName>java编程</bookName> <bookCode>001</bookCode> </Book> <Book id="2"> <bookName>jsp编程</bookName> <bookCode>002</bookCode> </Book> </books> <other>第一个书架</other> <date>2014-07-04</date></BookShelf>
3、如果觉得上面的指定代码太复杂了，也可以使用注解来实现
首先来看两个bean
@XStreamAlias("Book")public class Book { @XStreamAlias("id") @XStreamAsAttribute private int bookId; private String bookName; private String bookCode; ... }@XStreamAlias("BookShelf")public class BookShelf { private int number; //去掉集体节点的父节点 //@XStreamImplicit private List<Book> books; private String remark; @XStreamConverter(MuConverter.class) private Date date; public BookShelf(){ books=new ArrayList<Book>(); } ...}没有注解的字段按字段名默认来转换
直接调用方法即可
xStream.autodetectAnnotations(true);//也可以分别调用 //xStream.processAnnotations(BookShelf.class); //xStream.processAnnotations(Book.class);
上面的是对象转换为xml，现在来实现xml转换为对象，很简单（注意：xml转换成对象，需要通过上面的别名或注解的方式来指明转换，不能直接调用下面的代码）
XStream xStream=new XStream(new DomDriver());xStream.autodetectAnnotations(true);BookShelf bookShelf2=(BookShelf)xStream.fromXML(str);
序列化和反序列化支持
不多说，直接上代码
1、反序列化
ObjectInputStream input=xStream.createObjectInputStream(inputStream);BookShelf bookShelf=(BookShelf)input.readObject();2、序列化
ObjectOutputStream out=xstream.createObjectOutputStream(outputStream);out.writeObject(bookShelf);out.close();3、PrettyPrintWriter、CompactWriter
这两个是XStream自带的用于输出xml文件，区别在于后者输出的xml是连接的，前者输出的是有格式的xml
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