BeanUtils简单使用，beanutils,BeanUtils是ap

BeanUtils简单使用，beanutils,BeanUtils是ap

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。```java @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 ```javapublic 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```javapublic 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;}

}```