commins-beanutils的使用

commins-beanutils是通过内省来完成的。

需要两个包：

• commons-beanutils-1.8.3.jar
• commons-logging-1.1.1.jar

JavaBean类：

package cn.zy.study;
/**
 * 提供get和set方法
 * 并有一个无参的构造方法
 * @author zy
 *
 */
public class Person {

	private String name;
	private int age;
	private String gender;
	public Person() {
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + ", gender=" + gender
				+ "]";
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}

	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}

}

对bean类的操作

package cn.test;

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.junit.Test;

import cn.zy.study.Person;

public class Demo3 {

	@Test
	public void fun1() throws ClassNotFoundException, InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		//用Class类的forName方法来获取对应的class对象
		String className = "cn.zy.study.Person";
		Class clazz = Class.forName(className);
		//使用clazz对应类的默认构造器创造实例
		Object bean = clazz.newInstance();
		/**使用beanutils工具设置bean类的属性值,
		 * 所有的属相值都可以设置成String类型，将会自动转换
		 * 没有设置属性的值将为null
		 */
		BeanUtils.setProperty(bean, "name", "Scott");
		BeanUtils.setProperty(bean, "age", "17");
		System.out.println(bean);
		//得到bean类的属性值,注意属值都将变成String类型
		String name = BeanUtils.getProperty(bean, "name");
		String age = BeanUtils.getProperty(bean, "age");

	}

	@Test
	/**
	 * 将map直接封装到一个bean中
	 */
	public void fun2() throws InstantiationException, IllegalAccessException, InvocationTargetException{
		Map<String,String> map = new HashMap();
		map.put("name","Scott");
		map.put("age","15");
		//利用类的class属性来获取Class对象，并创建
		Person bean = Person.class.newInstance();
		//将map数据填充到Javabean中
		BeanUtils.populate(bean, map);
		System.out.println(bean);
	}

}