BeanUtils使用

使用maven创建项目，pom文件

<dependency>
	<groupId>commons-beanutils</groupId>
	<artifactId>commons-beanutils</artifactId>
	<version>1.9.3</version>
</dependency>

测试代码：

public class Person {//javabean
	private String name;//字段，当提供get或set方法，才叫做属性，class也是该类的属性，因为该类继承Object
	private String password;
	private int age;
	private Date birthday;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	@Override
	public String toString() {
		return "Person [name=" + name + ", password=" + password + ", age=" + age + ", birthday=" + birthday + "]";
	}
	
}

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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;

//BeanUtils操作bean
public class Demo1 {
	@Test
	public void test1() throws Exception {
		Person person=new Person();
		BeanUtils.setProperty(person, "age", 12);
		System.out.println(person.getAge());
	}
	
	@Test
	public void test2() throws Exception {
		String name="name";
		String password="password";
		String age="13";
		String birthday="1992-12-12";
		
		//为了让日期能赋值到bean属性中，我们需要注册一个日期转换器
		ConvertUtils.register(new Converter() {

			public <T> T convert(Class<T> type, Object value) {
				if(value==null){
					return null;
				}
				if(!(value instanceof String)){
					throw new ConversionException("转换异常");
				}
				String string=(String)value;
				if(string.trim().equals("")){
					return null;
				}
				SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
				
				try {
					return (T) sdf.parse(string);
				} catch (ParseException e) {
					throw new RuntimeException(e);//异常链不能断
				}
			}
			
		}, Date.class);
		
//		ConvertUtils.register(new DateLocaleConverter(), Date.class);//BeanUtils自带的日期转换器，但是该转换器有bug，不能处理“”的情况
		
		Person person=new Person();
		BeanUtils.setProperty(person, "name", name);
		BeanUtils.setProperty(person, "password", password);
		BeanUtils.setProperty(person, "age", age);//只支持8种基本数据类型
		BeanUtils.setProperty(person, "birthday", birthday);
		
		System.out.println(person.getName());
		System.out.println(person.getPassword());
		System.out.println(person.getAge());
		Date date = person.getBirthday();
		
		System.out.println(date.toLocaleString());
		
	}
	
	@Test
	public void test3() throws Exception {
		Map<String, String> map=new HashMap<String, String>();
		map.put("name", "name");
		map.put("password", "password");
		map.put("age", "12");
		map.put("birthday", "1992-12-12");
		ConvertUtils.register(new DateLocaleConverter(), Date.class);
		Person person=new Person();
		BeanUtils.populate(person, map);//用map填充Bean
		
		System.out.println(person);
	}
}