Apache Commons BeanUtils使用筆記

Commons-BeanUtils中包含大量和JavaBean操做有關的工具方法，提供自動類型轉換，使用BeanUtils可輕鬆利用Java反射機制來完成所需功能。

使用BeanUtils須要導入commons-beanutils-x.x.x.jar和commons-logging-x.x.jar

Apache Commons BeanUtils 1.9.3

Apache Commons Logging 1.2

測試實例

package cn.iborder.test;

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.ConvertUtils;
import org.apache.commons.beanutils.Converter;
import org.junit.Test;

import cn.iborder.entity.Admin;
import cn.iborder.entity.Admin1;

public class Test2 {
	
	@Test
	public void test1() {
		Admin admin = new Admin();
		try {
			//實現對象屬性的拷貝
			BeanUtils.copyProperty(admin, "userName", "baidu7");
			BeanUtils.setProperty(admin, "pwd", "baidu7");
			System.out.println(admin.getUserName()+"\t"+admin.getPwd());
			
			//對象拷貝
			Admin admin2 = new Admin();
			BeanUtils.copyProperties(admin2, admin);
			System.out.println(admin2.getUserName()+"\t"+admin2.getPwd());
			
			//map數據拷貝到對象
			//map中的key應該是javabean的屬性名稱一致
			Admin admin3 = new Admin();
			Map<String, Object> adminMap = new HashMap<String, Object>();
			adminMap.put("userName", "baidu8");
			adminMap.put("pwd", "baidu8");
			BeanUtils.populate(admin3, adminMap);
			System.out.println(admin3.getUserName()+"\t"+admin3.getPwd());
			
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//日期類型轉換器
	@Test
	public void test2() {
		//模擬表單數據
		String name = "jack";
		String age = "20";
		String birth = "1990-09-22";
		
		//封裝表單數據到對象
		Admin1 admin = new Admin();
		
		// 註冊日期類型轉換器		
		//ConvertUtils.register(new DateLocaleConverter(), Date.class);// 組件提供的轉換器工具類
		//自定義
		ConvertUtils.register(new Converter() {
			// 轉換的內部實現方法，須要重寫
			@Override
			public Object convert(Class type, Object value) {
				if (type != Date.class) {
					return null;
				}
				if (value == null || "".equals(value.toString().trim())) {
					return null;
				}
				try {
					// 字符串轉換爲日期
					SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
					return sdf.parse(value.toString());
				} catch (ParseException e) {
					throw new RuntimeException(e);
				}
			}
		},Date.class);
				
		// 把表單提交的數據，封裝到對象中
		BeanUtils.copyProperty(admin, "userName", name);
		BeanUtils.copyProperty(admin, "age", age);
		BeanUtils.copyProperty(admin, "birth", birth);
		
		//------ 測試------
		System.out.println(admin);
	}

}