Java基础六：apache的Beanutils简单使用对JavaBean操作的封装

/**
 * apache的Beanutils简单使用
 * 
 * @author 张明学
 * 
 */
public class BeanUtilsStudy {

	public static void main(String[] args) throws Exception {
		PersonBean pbean = new PersonBean("java", 12);
		pbean.setP("P属性");
		// 定义几个属性名称
		String propertyP = "p";
		String propertyName = "name";
		String propertyAge = "age";
		Object returnValue = null;
		// **************getProperty与setProperty方法：获取与设置JavaBean的属性**************
		// 获取p属性值
		returnValue = BeanUtils.getProperty(pbean, propertyP);
		System.out.println(returnValue);
		// 获取name属性值
		returnValue = BeanUtils.getProperty(pbean, propertyName);
		System.out.println(returnValue);
		// 设置p属性值
		BeanUtils.setProperty(pbean, propertyP, "C++");
		System.out.println(pbean.getP());
		// 设置age属性值
		BeanUtils.setProperty(pbean, propertyAge, 24);
		System.out.println(pbean.getAge());
		// 可以自动帮我们进行类型转换
		BeanUtils.setProperty(pbean, propertyAge, "25");
		System.out.println(pbean.getAge());
		// birthday类型的java.util.Date类，下面这样写在它在定义的是必须要实例化birthday
		// java.util.Date有一个setTime()方法可以看作JavaBean
		BeanUtils.setProperty(pbean, "birthday.time", new Date().getTime());
		System.out.println(pbean.getBirthday());

		// **************copyProperties方法：将一个JavaBean的属性copy到另一个JavaBean中**************
		// PersonBean2是PersonBean的子类
		PersonBean2 pb2 = new PersonBean2();
		// 将pbean的属性值copy到pb2属性
		BeanUtils.copyProperties(pb2, pbean);
		System.out.println(pb2.getName());

		// **************describe方法：将javaBean转换成Map对象************** \\
		Map beanMap = BeanUtils.describe(pbean);
		for (Object key : beanMap.keySet()) {
			System.out.println(key + "=" + beanMap.get(key));
		}

		// **************populate方法：将Map中的值设置到javaBean对象************** \\
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("name", ".NET");
		map.put("age", 32);
		map.put("p", "PPP");
		BeanUtils.populate(pbean, map);
		System.out.println(pbean.getName() + "\t" + pbean.getAge() + "\t"
				+ pbean.getP());

		// 还有一个PropertyUtils
		returnValue = PropertyUtils.getProperty(pbean, propertyName);
		System.out.println(returnValue);
		PropertyUtils.setProperty(pbean, propertyAge, 21);
		System.out.println(pbean.getAge());
		// PropertyUtils.setProperty(pbean, propertyAge, "21");不能自动进行类型转换

	}
}

 其中用的JavaBean如下：

public class PersonBean {
	private String name;
	private int age;
	private Date birthday = new Date();
	private String x;
	public PersonBean() {
	}
	public PersonBean(String name, int age) {
		this.name = name;
		this.age = age;
	}
	public String getP() {
		return x;
	}
	public void setP(String p) {
		this.x = p;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

 

public class PersonBean2 extends PersonBean {
	private String address;

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

}

 

评论

2 楼 slaser 2010-05-31  

这个东西也算java基础？

1 楼 mp_juan 2010-05-31  

建议楼主自己看java.lang.reflect包的API，然后使用reflect自己实现..