BeanUtils学习总结

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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;
package org.xiazdong.beanutils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
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;
import org.xiazdong.Person;
public class Demo01 {
// 设置属性
	@Test
	public void test1() throws Exception {
Person p = new Person();
BeanUtils.setProperty(p, "name", "xiazdong");
BeanUtils.setProperty(p, "age", 20);
System.out.println(p.getName());
System.out.println(p.getAge());
	}
// 自定义转换器
	@Test
	public void test2() throws Exception {
Person p = new Person();
ConvertUtils.register(new Converter() {
@Override
public Object convert(Class type, Object value) {
if (value == null) {
return null;
}
if (!(value instanceof String)) {
throw new ConversionException("conversion error");
}
String str = (String) value;
if (str.trim().equals("")) {
return null;
}
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
return sdf.parse(str);
} catch (ParseException e) {
throw new RuntimeException(e);
}
}
}, Date.class);
BeanUtils.setProperty(p, "birth", "2011-10-10");
System.out.println(p.getBirth().toLocaleString());
	}
// 使用内置的转换器
	@Test
	public void test3() throws Exception {
Person p = new Person();
ConvertUtils.register(new DateLocaleConverter(), Date.class);
BeanUtils.setProperty(p, "birth", "2011-10-10");
System.out.println(p.getBirth().toLocaleString());
	}
// 使用内置的转换器
	@Test
	public void test4() throws Exception {
Map map = new HashMap();
map.put("name", "xiazdong");
map.put("age", "20");
map.put("birth", "2010-10-10");
ConvertUtils.register(new DateLocaleConverter(), Date.class);
Person p = new Person();
BeanUtils.populate(p, map);
System.out.println(p.getAge());
System.out.println(p.getBirth());
	}
}
转自:http://blog.csdn.net/xiazdong/article/details/7339687
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