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对JavaBean的操作,Java提供了一套自己的方法,但是用起来感觉不咋的,但是Apache自己出版了一套BeanUtilsAPI方法进行Bean操作,很牛逼,很好用,下面放上几个小例子,用来入门吧,以后慢慢研究,当然,等有用的时候。
当然,使用这个玩意需要去下载JAR包的,BeanUTils下载地址为点击打开链接,他需要另一个第三包,下载地址为点击打开链接,将他们导入到工程路径中
首先贴上JavaBean的代码
package com.bird.beanutils;import java.util.Date;/*** @use 一个简单的Java Bean* @author Bird**/public class Person {public String name;private String sex;private String password;public int age;public Date birthday;public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}
下面是BeanUTils代码 package com.bird.beanutils;import java.lang.reflect.InvocationTargetException;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.junit.Test;/*** @use 使用Apache的BeanUtils操作JavaBean* @author Bird**/@SuppressWarnings("unused")public class Demo1 {@Testpublic void test1() throws Exception{Person p = new Person();BeanUtils.setProperty(p, "name", "Bird");//使用BeanUtils设置name的值System.out.println(p.getName());}@Testpublic void test2() throws Exception{//BeanUtils支持8种基本类型之间的转换Person p = new Person();String name = "Bird";String sex = "man";String age = "19";String password = "123";//由表单提交过来的都是String类型BeanUtils.setProperty(p, "name", name);BeanUtils.setProperty(p, "sex", sex);BeanUtils.setProperty(p, "age", age);//虽然age是整形,但是BeanUtils可以转换赋值 BeanUtils.setProperty(p, "password", password);System.out.println(p.getAge());System.out.println(p.getName());System.out.println(p.getPassword());System.out.println(p.getSex());}@Testpublic void test3() throws Exception{//注册BeanUtils的转换器,进行转换其他非8种基本类型的类型String birthday = "1992-01-01";ConvertUtils.register(new Converter(){//匿名内部类,实现Converter接口@SuppressWarnings("unchecked")public Object convert(Class type, Object value) {if(value == null){//如果传入值为空,return null;}if(!(value instanceof String)){//如果不是String类型,抛出异常throw new ConversionException("不支持非String类型!!!");}String str = (String) value;if(str.trim().equals("")){//如果没有值return null;}SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");try {return df.parse(str);} catch (ParseException e) {throw new RuntimeException(e);//保持异常链表不断}}}, Date.class);//注册转换器Person p = new Person();BeanUtils.setProperty(p, "birthday", birthday);System.out.println(p.getBirthday());}@SuppressWarnings("unchecked")@Testpublic void test5() throws Exception{//对Map的操作Map map = new HashMap();map.put("age", "19");Person bean = new Person();BeanUtils.populate(bean, map);//用Map集合中的值填充Bean的值System.out.println(bean.getAge());}} |
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