BeanUtils学习总结

一、BeanUtils介绍

BeanUtils是apache的开发库；

为了使用BeanUtils，需要导入

(1)common-logging-1.1.1.jar

(2)common-beanutils.jar

二、BeanUtils开发

(1)设置属性；

(2)注册转换器；

(3)自定义转换器；

(4)批量设置属性；

注意：JavaBean必须是public的，不然BeanUtils会抛异常；

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package org.xiazdong.beanutils;

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import java.text.ParseException;

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import java.text.SimpleDateFormat;

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import java.util.Date;

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import java.util.HashMap;

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import java.util.Map;

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import org.apache.commons.beanutils.BeanUtils;

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import org.apache.commons.beanutils.ConversionException;

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import org.apache.commons.beanutils.ConvertUtils;

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import org.apache.commons.beanutils.Converter;

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import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;

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import org.junit.Test;

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import org.xiazdong.Person;

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public class
Demo01 {

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    // 设置属性

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    @Test

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    public
void test1() throws
Exception {

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        Person p =
new Person();

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        BeanUtils.setProperty(p,
"name", "xiazdong");

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        BeanUtils.setProperty(p,
"age", 20);

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        System.out.println(p.getName());

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        System.out.println(p.getAge());

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    }

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    // 自定义转换器

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    @Test

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    public
void test2() throws
Exception {

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        Person p =
new Person();

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        ConvertUtils.register(new
Converter() {

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            @Override

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            public
Object convert(Class type, Object value) {

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                if
(value == null) {

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                    return
null;

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                }

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                if
(!(value instanceof 
String)) {

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                    throw
new ConversionException("conversion error");

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                }

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                String str = (String) value;

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                if
(str.trim().equals("")) {

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                    return
null;

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                }

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                SimpleDateFormat sdf =
new SimpleDateFormat("yyyy-MM-dd");

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                try
{

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                    return
sdf.parse(str);

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                }
catch (ParseException e) {

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                    throw
new RuntimeException(e);

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                }

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            }

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        }, Date.class);

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        BeanUtils.setProperty(p,
"birth", "2011-10-10");

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        System.out.println(p.getBirth().toLocaleString());

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    }

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    // 使用内置的转换器

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    @Test

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    public
void test3() throws
Exception {

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        Person p =
new Person();

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        ConvertUtils.register(new
DateLocaleConverter(), Date.class);

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        BeanUtils.setProperty(p,
"birth", "2011-10-10");

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        System.out.println(p.getBirth().toLocaleString());

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    }

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    // 使用内置的转换器

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    @Test

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    public
void test4() throws
Exception {

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        Map map =
new HashMap();

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        map.put("name",
"xiazdong");

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        map.put("age",
"20");

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        map.put("birth",
"2010-10-10");

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        ConvertUtils.register(new
DateLocaleConverter(), Date.class);

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        Person p =
new Person();

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        BeanUtils.populate(p, map);

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        System.out.println(p.getAge());

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        System.out.println(p.getBirth());

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    }

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}

转自：http://blog.csdn.net/xiazdong/article/details/7339687