Apache-Commons-BeanUtils

Commons-BeanUtils 基於Java 反射來完成對Bean的一些操做。經常使用於對於JavaBean進行各類操做，克隆對象,屬性等等。比較簡單。

###包介紹~~~~

• org.apache.commons.beanutils – 核心包，定義一組Utils類和須要用到的接口規範
• org.apache.commons.beanutils.converters – 轉換String到須要類型的類，實現Converter接口
• org.apache.commons.beanutils.locale – beanutils的locale敏感版本
• org.apache.commons.beanutils.locale.converters – converters的locale敏感版本
• org.apache.commons.collections – beanutils使用到的Collection類

###API分類

• 複製一個JavaBean的實例-- BeanUtils.cloneBean()

• 在一個JavaBean的兩個實例之間複製屬性-- BeanUtils.copyProperties()
  BeanUtils.copyProperty()

• 爲一個JavaBean的實例設置成員變量(屬性)值-- BeanUtils.populate()
  BeanUtils.setProperty()
  PropertyUtils.setSimpleProperty

• 從 一個一個JavaBean的實例中讀取成員變量(屬性)的值 -- BeanUtils.getArrayProperty()
  BeanUtils.getIndexedProperty()
  BeanUtils.getMappedProperty()
  BeanUtils.getNestedProperty()
  BeanUtils.getSimpleProperty()
  BeanUtils.getProperty()
  BeanUtils.describe()
  PropertyUtils.getSimpleProperty
  PropertyUtils.getIndexedProperty

###依賴:

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

###示例 對象定義

public class BeanutilCopyVo {
    private long id;
    private int age;
    private boolean sex;
    private float weight;
    private double height;
    private short classes;
    private String name;
    private Set<String> nicks;
    private Date birthDay;
    ...
}

對象設值.

private static BeanutilCopyVo getVo() {
        BeanutilCopyVo vo = new BeanutilCopyVo();
        vo.setAge(1);
        vo.setClasses((short) 2);
        vo.setHeight(3d);
        vo.setWeight(4f);
        vo.setName("name");
        vo.setId(0l);
        vo.setSex(true);
        vo.setBirthDay(new Date());
        Set<String> nicks = new HashSet<String>();
        nicks.add("1");
        nicks.add("2");
        nicks.add("3");
        vo.setNicks(nicks); 
        return vo;
    }

測試

@Test
    public void testCopySame() {
        BeanutilCopyVo vo2 = new BeanutilCopyVo();
        try {
            BeanUtils.copyProperties(vo2, vo); //拷貝整個對象
            assertEquals(1, vo2.getAge());
            assertEquals("1", BeanUtils.getProperty(vo2, "age")); //獲取一個屬性
            BeanUtils.setProperty(vo2, "age", 2); //設置一個屬性
            assertEquals("2", BeanUtils.getProperty(vo2, "age"));
        } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
            //LogUtil.get(this.getClass()).error(e);
        }
    }

    @Test
    public void testCopyProperty() {
        BeanutilCopyVo vo2 = new BeanutilCopyVo();
        try {
            BeanUtils.copyProperty(vo2, "age", "22");
            assertEquals("22", BeanUtils.getProperty(vo2, "age"));
            ConvertUtils.register(new BeanutilDateConverter(), Date.class); //特殊屬性時間的處理 
            BeanUtils.copyProperty(vo2, "birthDay", "2016-09-11"); 
            assertNotNull(BeanUtils.getProperty(vo2, "birthDay"));
//            assertEquals("2016-09-11", BeanUtils.getProperty(vo2, "birthDay"));
        } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
            //LogUtil.get(this.getClass()).error(e);
        }
    }

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.commons.beanutils.Converter;

import com.zx.common.log.LogUtil;

public class BeanutilDateConverter implements Converter {

    private SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

    /** 
     *  要將字符串的value轉換爲java.util.Date類型的值 
     *  @param targetClass 第一個參數 是你的目標類型 
     *   @param value   要轉換的值， 
     *   @return   把要轉回的值，返回出去就ok了 
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public Date convert(Class targetClass, Object value) {

        if (targetClass != Date.class) {
            return null;
        }
        try {
            if (value instanceof String) {
                String v = (String) value;
                return format.parse(v);
            }
        } catch (ParseException e) {
            LogUtil.get(this.getClass()).error(e);
        }

        return null;
    }

}

2016-11-06 09:29:52 星期日