对象工具类 - ObjectUtils.java

对象工具类，提供对象克隆、获取对象属性、类型判断、Map转换对象、对象转Map、设置对象属性等。

源码如下：(点击下载 -  ObjectUtils.java 、JsonUtils.java 、gson-2.2.4.jar 、commons-lang-2.6.jar)

 import java.io.Serializable;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.Map;
 import org.apache.commons.lang.SerializationUtils;
 import org.apache.commons.lang.StringUtils;

 /**
  * 对象工具类
  *
  */
 public class ObjectUtils {

     private static final Class<?>[] BASIC_NUMBER_CLASSES = new Class[] {
             short.class, int.class, long.class, float.class, double.class };

     /**
      * 对象克隆
      *
      * @param t
      *            a T object.
      * @param <T>
      *            a T object.
      * @return a T object.
      */
     @SuppressWarnings("unchecked")
     public static final <T> T clone(T t) {
         if (t == null) {
             return null;
         }
         if (t instanceof Serializable) {
             return (T) SerializationUtils.clone((Serializable) t);
         }
         T result = null;
         if (t instanceof Cloneable) {
             try {
                 result = (T) ObjectUtils.clone(t);
             } catch (Throwable e) {
             }
         }
         if (result == null) {
             String json = JsonUtils.toJson(t);
             result = (T) JsonUtils.fromJson(json, t.getClass());
         }
         return result;
     }

     /**
      * 访问对象成员属性值值
      *
      * @param obj
      * @param field
      * @return
      * @throws YichaException
      */
     @SuppressWarnings("rawtypes")
     private static final Object getFieldValue(Object obj, String field) throws Exception {
         Object result = null;
         if (obj instanceof Map) {
             return ((Map) obj).get(field);
         }

         if (obj == null) {
             return null;
         }

         Method getterMethod = null;
         try {
             getterMethod = obj.getClass().getMethod("get" + StringUtils.capitalize(field));
         } catch (Exception e) {
         }
         if (getterMethod == null) {
             try {
                 getterMethod = obj.getClass().getMethod("is" + StringUtils.capitalize(field));
             } catch (Exception e) {
             }
         }
         if (getterMethod == null) {
             Field privateField;
             try {
                 privateField = obj.getClass().getDeclaredField(field);
                 privateField.setAccessible(true);
                 result = privateField.get(obj);
             } catch (Exception e) {
                 throw new Exception("field[" + field + "] doesn't exist.");
             }
         } else {
             try {
                 result = getterMethod.invoke(obj);
             } catch (Exception e) {
             }
         }
         return result;
     }

     /**
      * 获取对象属性值
      *
      * @param obj
      *            被取值的对象
      * @param clazz
      *            返回值的类型
      * @param path
      *            格式:field1.field2.field3
      * @param <T>
      *            a T object.
      * @return a T object.
      */
     @SuppressWarnings("unchecked")
     public static final <T> T getValue(Object obj, Class<T> clazz, String path) {
         Object o = getValue(obj, path);
         return o == null ? null : (T) o;
     }

     /**
      * <p>
      * getValue.
      * </p>
      *
      * @param obj
      *            a {@link java.lang.Object} object.
      * @param path
      *            a {@link java.lang.String} object.
      * @return a {@link java.lang.Object} object.
      */
     public static final Object getValue(Object obj, String path) {
         if (obj == null || StringUtils.isBlank(path)) {
             return null;
         }
         String[] arr = StringUtils.split(path, ".");
         Object o = obj;
         for (int i = 0, len = arr.length; i < len; i++) {
             final String field = StringUtils.strip(arr[i]);
             try {
                 o = getFieldValue(o, field);
             } catch (Exception e) {
                 o = null;
             }
         }
         return o;
     }

     /**
      * 判断是否是数字类型
      *
      * @param obj
      *            a {@link java.lang.Object} object.
      * @return a boolean.
      */
     public static final boolean isNumberType(Object obj) {
         if (obj == null) {
             throw new RuntimeException("object is null.");
         }
         if (obj instanceof Number) {
             return true;
         } else {
             for (Class<?> clazz : BASIC_NUMBER_CLASSES) {
                 if (obj.getClass().equals(clazz)) {
                     return true;
                 }
             }
         }
         return false;
     }

     /**
      * 判断对象是否为零
      *
      * @param obj
      *            a {@link java.lang.Object} object.
      * @return a boolean.
      */
     public static final boolean isZero(Object obj) {
         if (!isNumberType(obj)) {
             return false;
         }
         final String foo = String.valueOf(obj);
         return StringUtils.equals(foo, "0") || StringUtils.equals(foo, "0.0");
     }

     /**
      * Map转换对象
      *
      * @param map
      *            a {@link java.util.Map} object.
      * @param clazz
      *            a {@link java.lang.Class} object.
      * @param <T>
      *            a T object.
      * @return a T object.
      */
     public static final <T> T fromMap(final Map<String, Object> map, Class<T> clazz) {
         return JsonUtils.fromJson(JsonUtils.toJson(map), clazz);
     }

     /**
      * 对象转Map
      *
      * @param object
      *            a {@link java.lang.Object} object.
      * @return a {@link java.util.Map} object.
      */
     public static final Map<String, Object> toMap(final Object object) {
         return JsonUtils.fromJson(JsonUtils.toJson(object));
     }

     /**
      * 设置对象属性
      *
      * @param object
      *            a {@link java.lang.Object} object.
      * @param field
      *            a {@link java.lang.String} object.
      * @param value
      *            a T object.
      * @param paramType
      *            a {@link java.lang.Class} object.
      * @param <T>
      *            a T object.
      */
     @SuppressWarnings("rawtypes")
     public static final <T> void setValue(final Object object, final String field, final T value, final Class paramType) {
         try {
             Method md = object.getClass().getMethod("set" + StringUtils.capitalize(field), paramType);
             if (md != null) {
                 md.invoke(object, value);
             }
         } catch (Throwable e) {
             throw new RuntimeException(e);
         }
     }

     /**
      * 设置对象属性
      *
      * @param object
      *            a {@link java.lang.Object} object.
      * @param field
      *            a {@link java.lang.String} object.
      * @param value
      *            a T object.
      * @param <T>
      *            a T object.
      */
     public static final <T> void setValue(final Object object, final String field, final T value) {
         try {
             for (Method method : object.getClass().getMethods()) {
                 if (StringUtils.equals(method.getName(), "set" + StringUtils.capitalize(field))) {
                     method.invoke(object, value);
                     break;
                 }
             }
         } catch (Throwable e) {
             throw new RuntimeException(e);
         }
     }

 }