Commons BeanUtils 中对Map的操作

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populate(bean,map) 将Map中的值设入bean中

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

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"));

    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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