BeanUtils简单使用详解编程语言

BeanUtils是apache提供的的一个工具类，在很多地方我们都要用到这个类。下面说说这个类的简单用法。

相关的使用细节已经在代码的注释中说明了。

   @Test 
    public void test5(){ 
        try { 
            Person p = new Person(new Book()); 
            //使用beanUtils给对象的属性赋值 
            BeanUtils.setProperty(p, "username", "张三"); 
            //使用beanUtils获取对象的属性值 
            System.out.println(BeanUtils.getProperty(p, "username")); 
            //beanUtils支持属性链赋值与获得值,不过赋值前book要先实例化 
            BeanUtils.setProperty(p, "book.name", "历史小说"); 
            System.out.println(BeanUtils.getProperty(p, "book.name")); 
            System.out.println(p.getBook().getName()); 
            //把一个对象的值赋给另一个对象 
            Person p2 = new Person(); 
            BeanUtils.copyProperties(p2, p); 
            System.out.println(p2.getUsername()+","+p2.getBook().getName()); 
            Map<String,String> map = new HashMap<String, String>(); 
            //把Map的值拷贝给一个JavaBean 
            Person p3 = new Person(); 
            map.put("username", "张三"); 
            map.put("password", "9999"); 
            BeanUtils.populate(p3, map ); 
            System.out.println(p3.getUsername()+","+p3.getPassword()); 
        } catch (IllegalAccessException | InvocationTargetException 
                | NoSuchMethodException e) { 
            e.printStackTrace(); 
        } 
    }

Person.java

public class Person { 
 
    private String username; 
    private String password; 
    private int money; 
    private Book book; 
 
    public Person() { 
    } 
 
    public Person(Book book) { 
        this.book = book; 
    } 
 
    public Book getBook() { 
        return book; 
    } 
    public void setBook(Book book) { 
        this.book = book; 
    } 
    public String getUsername() { 
        return username; 
    } 
    public void setUsername(String username) { 
        this.username = username; 
    } 
    public String getPassword() { 
        return password; 
    } 
    public void setPassword(String password) { 
        this.password = password; 
    } 
    public int getMoney() { 
        return money; 
    } 
    public void setMoney(int money) { 
        this.money = money; 
    } 
 
}

Book.java

public class Book { 
 
    private int id; 
    private String name; 
    private int price; 
    private String author; 
    private Detail detail; 
    private Attribute attribute; 
 
    public Attribute getAttribute() { 
        return attribute; 
    } 
    public void setAttribute(Attribute attribute) { 
        this.attribute = attribute; 
    } 
    public Detail getDetail() { 
        return detail; 
    } 
    public void setDetail(Detail detail) { 
        this.detail = detail; 
    } 
    public int getId() { 
        return id; 
    } 
    public void setId(int id) { 
        this.id = id; 
    } 
    public String getName() { 
        return name; 
    } 
    public void setName(String name) { 
        this.name = name; 
    } 
    public int getPrice() { 
        return price; 
    } 
    public void setPrice(int price) { 
        this.price = price; 
    } 
    public String getAuthor() { 
        return author; 
    } 
    public void setAuthor(String author) { 
        this.author = author; 
    } 
}