BeanUtils学习总结 一、BeanUtils介绍 二、BeanUtils开发
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；
转自：http://blog.****.net/xiazdong/article/details/7339687
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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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} |