BeanUtils簡單使用

BeanUtils是apache提供的的一個工具類，在很多地方我們都要用到這個類。下面說說這個類的簡單用法。
相關的使用細節已經在代碼的注釋中說明了。

   @Test
    public void test5(){
        try {
            Person p = new Person(new Book());
            //使用beanUtils給對象的屬性賦值
            BeanUtils.setProperty(p, "username", "張三");
            //使用beanUtils獲取對象的屬性值
            System.out.println(BeanUtils.getProperty(p, "username"));
            //beanUtils支持屬性鏈賦值與獲得值,不過賦值前book要先實例化
            BeanUtils.setProperty(p, "book.name", "歷史小說");
            System.out.println(BeanUtils.getProperty(p, "book.name"));
            System.out.println(p.getBook().getName());
            //把一個對象的值賦給另一個對象
            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的值拷貝給一個JavaBean
            Person p3 = new Person();
            map.put("username", "張三");
            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;
}


}</pre> 

 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;
}

}</pre>