spring 内部的一些工具类

2022-02-19 19:10 110阅读 0赞

1、BeanUtils

package com.example.commons;
    
    import java.time.LocalDate;
    
    import org.junit.Test;
    import org.springframework.beans.BeanUtils;
    
    /**
     * {@code BeanUtils} 工具类例子
     * @author Chen
     *
     */
    public class BeanUtilsTest {
    
    	/**
    	 * 调用无参构造方法创建对象
    	 */
    	@Test
    	public void beanUtils() {
    		Person person = BeanUtils.instantiateClass(Person.class);
    		person.setName("张三");
    		person.setBirthday(LocalDate.of(1991, 1, 1));
    		System.out.println(person.toString());
    	}
    	
    	/**
    	 * 复制，两个对象的类型不必一样
    	 */
    	@Test
    	public void copy() {
    		Person p1 = new Person();
    		p1.setName("张三");
    		p1.setBirthday(LocalDate.of(1991, 1, 1));
    		Person p2 = new Person();
    		BeanUtils.copyProperties(p1, p2);
    		System.out.println(p2.toString());
    	}
    }
    
    class Person {
    	
    	private String name;
    	
    	private LocalDate birthday;
    
    	
    	public Person() {
    		super();
    		
    	}
    
    	public Person(String name, LocalDate birthday) {
    		super();
    		this.name = name;
    		this.birthday = birthday;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public LocalDate getBirthday() {
    		return birthday;
    	}
    
    	public void setBirthday(LocalDate birthday) {
    		this.birthday = birthday;
    	}
    
    	@Override
    	public String toString() {
    		return "Person [name=" + name + ", birthday=" + birthday + "]";
    	}
    	
    }

2、org.springframework.util路径下都是工具类