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；

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()); } }