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;
}
}BeanUtils还有许多好用的方法，想要详细了解可以查看官方的帮助文档。