Commons BeanUtils 中对Map的操作

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    Commons BeanUtils 中对Map的操作            
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populate(bean,map) 将Map中的值设入bean中

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print?

1. BeanUtils.populate(bean, request.getParameterMap());  

BeanUtils.populate(bean, request.getParameterMap());

PropertyUtils.describe() 方法将返回bean中每个可读的属性都添加到Map中去.如果值为设置,将返回默认值,在上面的例子中假如Book类中还有个Integer型的page属性,代表书籍页数.在没设置的情况下,将返回null.如果page属性为int型,则将返回0

摘自：http://www.blogjava.NET/hexuzhong/archive/2005/11/30/21925.html

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1. Person author = new Person();  
2. author.setName("Timothy M. O'Brien");  
3.       
4. Book book = new Book();  
5. book.setName("Jakarta Commons Cookbook");  
6. book.setAuthor(author);  
7.   
8. // 取得book中的所有可读属性,返回到map中  
9. Map bookMap = PropertyUtils.describe(book);  
10. // Book类中包含一个Author类型的属性  
11. // 取bookMap中的author bean,并将其所有可读属性返回到authorMap中  
12. Map authorMap = PropertyUtils.describe(bookMap.get("author"));  
13.   
14. // 输出  
15. // Book Name: Jakarta Commons Cookbook  
16. // Author Name: Timothy M. O'Brien  
17. System.out.println("Book Name: " + bookMap.get("name"));  
18. System.out.println("Author Name: " + authorMap.get("name"));  

    Person author = new Person();
    author.setName("Timothy M. O'Brien");
Book book = new Book();
book.setName("Jakarta Commons Cookbook");
book.setAuthor(author);

// 取得book中的所有可读属性,返回到map中
Map bookMap = PropertyUtils.describe(book);
// Book类中包含一个Author类型的属性
// 取bookMap中的author bean,并将其所有可读属性返回到authorMap中
Map authorMap = PropertyUtils.describe(bookMap.get("author"));

// 输出
// Book Name: Jakarta Commons Cookbook
// Author Name: Timothy M. O'Brien
System.out.println("Book Name: " + bookMap.get("name"));
System.out.println("Author Name: " + authorMap.get("name"));</pre><br>

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