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；

查看源码打印?

01	package org.xiazdong.beanutils;

02

03	import java.text.ParseException;

04	import java.text.SimpleDateFormat;

05	import java.util.Date;

06	import java.util.HashMap;

07	import java.util.Map;

08

09	import org.apache.commons.beanutils.BeanUtils;

10	import org.apache.commons.beanutils.ConversionException;

11	import org.apache.commons.beanutils.ConvertUtils;

12	import org.apache.commons.beanutils.Converter;

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

14	import org.junit.Test;

15	import org.xiazdong.Person;

16

17	public class Demo01 {

18

19

// 设置属性

20

@Test

21	public void test1() throws Exception {

22	Person p = new Person();

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

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

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

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

27

}

28

29

// 自定义转换器

30

@Test

31	public void test2() throws Exception {

32	Person p = new Person();

33	ConvertUtils.register(new Converter() {

34

35

@Override

36	public Object convert(Class type, Object value) {

37	if (value == null) {

38	return null;

39

}

40	if (!(value instanceof String)) {

41	throw new ConversionException("conversion error");

42

}

43	String str = (String) value;

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

45	return null;

46

}

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

48

try {

49	return sdf.parse(str);

50	} catch (ParseException e) {

51	throw new RuntimeException(e);

52

}

53

54

}

55

56	}, Date.class);

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

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

59

}

60

61	// 使用内置的转换器

62

@Test

63	public void test3() throws Exception {

64	Person p = new Person();

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

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

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

68

}

69

70	// 使用内置的转换器

71

@Test

72	public void test4() throws Exception {

73	Map map = new HashMap();

74	map.put("name", "xiazdong");

75	map.put("age", "20");

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

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

78	Person p = new Person();

79	BeanUtils.populate(p, map);

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

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

82

}

83

}

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