利用Apache BeanUtilsBean的copyProperties进行对象属性值copy

在开发中进行遇到值对象和实体间的数据复制.

其中最常用的为Apache BeanUtilsBean的copyProperties.

本次测试发现该工具可兼容大部分数据格式,但在Java.sql.Date和java.util.Date复制时,原数据如为空将发送报错.

通过注册BeanUtilsBean的转换器,简单封装copyProperties方法.

完成效果: 调用封装后的工具类方法复制对象属性时, 遇到Date数据一律给予新对象对应属性赋值为null.

测试代码如下

 1.1 实体类Student

public class Student {
	private int intValue;
	private double doubleValue;
	private long longValue0;
	private boolean booleanValue0;
	private Boolean booleanValue1;
	private String strintValue;
	private java.util.Date utilDateValue;
	private java.sql.Date sqlDateValue;
	private Integer IntegerValue;
	private Long LongValue1;
	private Teacher teacher;
	
	//getter/setter
	public int getIntValue() {
		return intValue;
	}
	public void setIntValue(int intValue) {
		this.intValue = intValue;
	}
	public double getDoubleValue() {
		return doubleValue;
	}
	public void setDoubleValue(double doubleValue) {
		this.doubleValue = doubleValue;
	}
	public String getStrintValue() {
		return strintValue;
	}
	public void setStrintValue(String strintValue) {
		this.strintValue = strintValue;
	}
	public java.util.Date getUtilDateValue() {
		return utilDateValue;
	}
	public void setUtilDateValue(java.util.Date utilDateValue) {
		this.utilDateValue = utilDateValue;
	}
	public java.sql.Date getSqlDateValue() {
		return sqlDateValue;
	}
	public void setSqlDateValue(java.sql.Date sqlDateValue) {
		this.sqlDateValue = sqlDateValue;
	}
	public Integer getIntegerValue() {
		return IntegerValue;
	}
	public void setIntegerValue(Integer integerValue) {
		IntegerValue = integerValue;
	}
	public long getLongValue0() {
		return longValue0;
	}
	public void setLongValue0(long longValue0) {
		this.longValue0 = longValue0;
	}
	public Long getLongValue1() {
		return LongValue1;
	}
	public void setLongValue1(Long longValue1) {
		LongValue1 = longValue1;
	}
	public boolean isBooleanValue0() {
		return booleanValue0;
	}
	public void setBooleanValue0(boolean booleanValue0) {
		this.booleanValue0 = booleanValue0;
	}
	public Boolean getBooleanValue1() {
		return booleanValue1;
	}
	public void setBooleanValue1(Boolean booleanValue1) {
		this.booleanValue1 = booleanValue1;
	}
	public Teacher getTeacher() {
		return teacher;
	}
	public void setTeacher(Teacher teacher) {
		this.teacher = teacher;
	}
	
}

1.2 实体类teacher

public class Teacher {
	private int id;
	private String name;
	
	//getter/setter
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

	
}

2 简单封装的工具类BeanUtilPlus1

package com.test.util;

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.beanutils.converters.SqlDateConverter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 继承apache的BeanUtils,避免调用copyProperties时因date为空而报错的情况
 */
public class BeanUtilPlus1 extends BeanUtils {
	private static Map cache = new HashMap();
	private static Log logger = LogFactory.getFactory().getInstance(
			BeanUtilPlus1.class);

	private BeanUtilPlus1() {
	}

	static {
		//注册sql.date的转换器，即允许BeanUtils.copyProperties时的源目标的sql类型的值允许为空
		ConvertUtils.register(new SqlDateConverter(null),  java.sql.Date.class);
		//ConvertUtils.register(new SqlTimestampConverter(), java.sql.Timestamp.class);
		//注册util.date的转换器，即允许BeanUtils.copyProperties时的源目标的util类型的值允许为空
		ConvertUtils.register(new DateConverter(null), java.util.Date.class);
	}

	public static void copyProperties(Object target, Object source)
			throws InvocationTargetException, IllegalAccessException {
		//支持对日期copy
		org.apache.commons.beanutils.BeanUtils.copyProperties(target, source);

	}

}

3 测试类testClient

使用反射机制打印出对象的属性值

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.test.util.BeanUtilPlus1;

public class testClient {
	/**
	 * 测试BeanUtilsBean.getInstance().copyProperties对数据进行赋值时候的效果
	 * java.sql.Date不可为空值
	 * java.util.Date不可为空值
	 * 
	 * 使用改进的BeanUtilPlus1.copyProperties
	 * Date为空时,直接赋空值.
	 */
	public static void main(String[] args) {
		/**
		 * 初始化数据
		 */
		Teacher t1=new Teacher();
			t1.setId(1);
			t1.setName("teacher t1");
		Student s1=new Student();
			s1.setBooleanValue0(true);
			s1.setBooleanValue1(true);
			s1.setDoubleValue(1.1);
			s1.setIntegerValue(12);
			s1.setIntValue(123);
			s1.setLongValue0(12L);
			s1.setLongValue1(2L);
//			s1.setSqlDateValue(new java.sql.Date(new java.util.Date().getTime()));
//			s1.setUtilDateValue(new java.util.Date());
			s1.setStrintValue("student s1");
			s1.setTeacher(t1);
			try {
				//打印出所有内容
				Class c = Class.forName("Student");
//				Object o = c.newInstance();
				Object o=s1;
				Method[] ms= c.getMethods();
//				System.out.println(ms.length);
				System.out.println("原始数据");
				for(Method m:ms){
					if( m.getName().contains("get")){
						System.out.println("method  "+m.getName()+"  : ");
						System.out.println(m.invoke(o));
					}
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
			Student s2=new Student();
			try {
//				BeanUtilsBean.getInstance().copyProperties(s2, s1);  //调用copy方法
				BeanUtilPlus1.copyProperties(s2,s1); //调用改写过的copy方法
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				e.printStackTrace();
			}
			try {
				Class c = Class.forName("Student");
				Object o=s2;
				Method[] ms= c.getMethods();
				System.out.println("新数据");
				for(Method m:ms){
					if( m.getName().contains("get")){
						System.out.println("method  "+m.getName()+"  : ");
						System.out.println(m.invoke(o));
					}
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
	}

}