ConvertUtils.register注冊轉換器

當用到BeanUtils的populate、copyProperties方法或者getProperty,setProperty方法其實都會調用convert進行轉換

但Converter只支持一些基本的類型，甚至連java.util.Date類型也不支持。而且它比較笨的一個地方是當遇到不認識的類型時，居然會拋出異常來。
這個時候就需要給類型注冊轉換器。比如： 意思是所以需要轉成Date類型的數據都要通過DateLocaleConverter這個轉換器的處理。
ConvertUtils.register(new DateLocaleConverter(), Date.class);
示例:

import java.util.Date;

public class Person {
    private String name;
    private int age;
    private Date birth;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Date getBirth() {
        return birth;
    }
    public void setBirth(Date birth) {
        this.birth = birth;
    }
}

import java.util.Date;

public class Person {
	private String name;
	private int age;
	private Date birth;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Date getBirth() {
		return birth;
	}
	public void setBirth(Date birth) {
		this.birth = birth;
	}
}

test1沒有給Date注冊轉換器，拋出ConversionException異常,test2沒有異常

@Test
    public void test1() throws Exception {
        Map map = new HashMap();
        map.put("name", "xiazdong");
        map.put("age", "20");
        map.put("birth", "2010-10-10");
        Person p = new Person();
        BeanUtils.populate(p, map);
        System.out.println(p.getAge());
        System.out.println(p.getBirth().toLocaleString());
    }

@Test
	public void test1() throws Exception {
		Map map = new HashMap();
		map.put("name", "xiazdong");
		map.put("age", "20");
		map.put("birth", "2010-10-10");
		Person p = new Person();
		BeanUtils.populate(p, map);
		System.out.println(p.getAge());
		System.out.println(p.getBirth().toLocaleString());
	}

@Test
    public void test2() 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().toLocaleString());
    }

@Test
	public void test2() 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().toLocaleString());
	}

ConvertUtils除了給指定類型注冊轉換器外，還可以將數據轉換為指定類型

String[] values = new String[]{};
(long[])ConvertUtils.convert(values, long.class);