commons-beanutils的使用

commons-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);
    }
 
}