使用beanUtils操纵bean的属性

注意：使用beanUtils操纵bean的属性时需要使用到的包有：commons-beanutils-1.8.3.jar     commons-logging-1.1.1.jar

 

创建Demo1类来操作Person中的benan

package com.zyw.beanutils;

import java.util.Date;

public class Person {
    private String name;
    private String password;
    private int age;
    private Date birthday;
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    public String getName() {
        return name;
    }
    public String getPassword() {
        return password;
    }
    public int getAge() {
        return age;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public void setAge(int age) {
        this.age = age;
    }

}

 

　　Demo1

package com.zyw.beanutils;

import java.lang.reflect.InvocationTargetException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;
import org.junit.Test;

//使用beanUtils操纵bean的属性 ( 第三方）
public class Demo1 {
    @Test
    public void test1() throws Exception{
        Person p=new Person();
        BeanUtils.setProperty(p, "age", 456);
        System.out.println(p.getAge());//456
    }
    @Test
    public void test2() throws Exception{
        String name="aaaa";
        String age="123";
        String password="pw";
                
        Person p=new Person();
        //支持8种基本类型自动转换
        BeanUtils.setProperty(p, "name", name);
        BeanUtils.setProperty(p, "age", age);
        BeanUtils.setProperty(p, "password", password);
        
        System.out.println(p.getName());//aaaa
        System.out.println(p.getAge());//123
        System.out.println(p.getPassword());//pw

    }
    @Test
    public void test3() throws Exception{

        String birthday="1983-12-1";
        
        //为了让日期赋值到bean的birthday属性上，给beanUtils注册一个日期转换器
        //ConvertUtils.register(converter, Date.class);
        ConvertUtils.register(new Converter(){
            
            public Object convert(Class type, Object value) {
                if(value==null) return null;
                if(!(value instanceof String)){
                    throw new ConversionException("只支持String类型的转换");
                }
                String str=(String)value;
                if(str.trim().equals("")) return null;
                SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd",Locale.US);
        
                try {
                    return df.parse(str);//将String转化为日期
                } catch (ParseException e) {
                    throw new RuntimeException(e);                    
                }
            }
        }, Date.class);
        Person p=new Person();
        BeanUtils.setProperty(p, "birthday", birthday);
        SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
        
        System.out.println(df.format(p.getBirthday()));//pw
        System.out.println("___"+BeanUtils.getProperty(p, "birthday"));
    }
    public static void main(String[] args) throws IllegalAccessException, InvocationTargetException {

        Map map=new HashMap();
        map.put("name", "aaa");
        map.put("password", "123");
        map.put("birthday", "1980-09-09");
        map.put("age", "23");
        //自带的转化器   有一个bug   其中brithday 不能为“”
        ConvertUtils.register(new DateLocaleConverter(), Date.class);
        Person p=new Person();
        //用map集合填充bean属性,map关键字和bean属性要一致
        BeanUtils.populate(p, map);
        
        System.out.println("name:"+p.getName());
        System.out.println("age:"+p.getAge());
        System.out.println("passw:"+p.getPassword());
        System.out.println("bir:"+p.getBirthday());
    
    }
}