beanutils.java

使用WEBWORK,SPRING,HIBERNATE编写的简单的添加

/**
 *文件功能： 
 */
package com.common.util;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.collections.FastHashMap;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;

/**
 * @作者 徐建协
 * @日期 2008-1-18
 */
public class BeanUtils {
	protected static final Log logger = LogFactory.getLog(BeanUtils.class);

	private BeanUtils() {
	}

	/**
	 * 循环向上转型,获取对象的DeclaredField.
	 *
	 * @throws NoSuchFieldException 如果没有该Field时抛出.
	 */
	public static Field getDeclaredField(Object object, String propertyName) throws NoSuchFieldException {
		Assert.notNull(object);
		Assert.hasText(propertyName);
		return getDeclaredField(object.getClass(), propertyName);
	}

	/**
	 * 循环向上转型,获取对象的DeclaredField.
	 *
	 * @throws NoSuchFieldException 如果没有该Field时抛出.
	 */
	public static Field getDeclaredField(Class clazz, String propertyName) throws NoSuchFieldException {
		Assert.notNull(clazz);
		Assert.hasText(propertyName);
		for (Class superClass = clazz; superClass != Object.class; superClass = superClass.getSuperclass()) {
			try {
				return superClass.getDeclaredField(propertyName);
			} catch (NoSuchFieldException e) {
				// Field不在当前类定义,继续向上转型
			}
		}
		throw new NoSuchFieldException("No such field: " + clazz.getName() + '.' + propertyName);
	}

	/**
	 * 暴力获取对象变量值,忽略private,protected修饰符的限制.
	 *
	 * @throws NoSuchFieldException 如果没有该Field时抛出.
	 */
	public static Object forceGetProperty(Object object, String propertyName) throws NoSuchFieldException {
		Assert.notNull(object);
		Assert.hasText(propertyName);

		Field field = getDeclaredField(object, propertyName);

		boolean accessible = field.isAccessible();
		field.setAccessible(true);

		Object result = null;
		try {
			result = field.get(object);
		} catch (IllegalAccessException e) {
			logger.info("error wont' happen");
		}
		field.setAccessible(accessible);
		return result;
	}

	/**
	 * 暴力设置对象变量值,忽略private,protected修饰符的限制.
	 *
	 * @throws NoSuchFieldException 如果没有该Field时抛出.
	 */
	public static void forceSetProperty(Object object, String propertyName, Object newValue)
			throws NoSuchFieldException {
		Assert.notNull(object);
		Assert.hasText(propertyName);

		Field field = getDeclaredField(object, propertyName);
		boolean accessible = field.isAccessible();
		field.setAccessible(true);
		try {
			field.set(object, newValue);
		} catch (IllegalAccessException e) {
			logger.info("Error won't happen");
		}
		field.setAccessible(accessible);
	}

	/**
	 * 暴力调用对象函数,忽略private,protected修饰符的限制.
	 *
	 * @throws NoSuchMethodException 如果没有该Method时抛出.
	 */
	public static Object invokePrivateMethod(Object object, String methodName, Object... params)
			throws NoSuchMethodException {
		Assert.notNull(object);
		Assert.hasText(methodName);
		Class[] types = new Class[params.length];
		for (int i = 0; i < params.length; i++) {
			types[i] = params[i].getClass();
		}

		Class clazz = object.getClass();
		Method method = null;
		for (Class superClass = clazz; superClass != Object.class; superClass = superClass.getSuperclass()) {
			try {
				method = superClass.getDeclaredMethod(methodName, types);
				break;
			} catch (NoSuchMethodException e) {
				// 方法不在当前类定义,继续向上转型
			}
		}

		if (method == null)
			throw new NoSuchMethodException("No Such Method:" + clazz.getSimpleName() + methodName);

		boolean accessible = method.isAccessible();
		method.setAccessible(true);
		Object result = null;
		try {
			result = method.invoke(object, params);
		} catch (Exception e) {
			ReflectionUtils.handleReflectionException(e);
		}
		method.setAccessible(accessible);
		return result;
	}

	/**
	 * 按Filed的类型取得Field列表.
	 */
	public static List<Field> getFieldsByType(Object object, Class type) {
		List<Field> list = new ArrayList<Field>();
		Field[] fields = object.getClass().getDeclaredFields();
		for (Field field : fields) {
			if (field.getType().isAssignableFrom(type)) {
				list.add(field);
			}
		}
		return list;
	}

	/**
	 * 按FiledName获得Field的类型.
	 */
	public static Class getPropertyType(Class type, String name) throws NoSuchFieldException {
		return getDeclaredField(type, name).getType();
	}

	/**
	 * 获得field的getter函数名称.
	 */
	public static String getGetterName(Class type, String fieldName) {
		Assert.notNull(type, "Type required");
		Assert.hasText(fieldName, "FieldName required");

		if (type.getName().equals("boolean")) {
			return "is" + StringUtils.capitalize(fieldName);
		} else {
			return "get" + StringUtils.capitalize(fieldName);
		}
	}

	/**
	 * 获得field的getter函数,如果找不到该方法,返回null.
	 */
	public static Method getGetterMethod(Class type, String fieldName) {
		try {
			return type.getMethod(getGetterName(type, fieldName));
		} catch (NoSuchMethodException e) {
			logger.error(e.getMessage(), e);
		}
		return null;
	}
	
    // ------------------------------------------------------ Private Variables


    /**
     * Dummy collection from the Commons Collections API, to force a
     * ClassNotFoundException if commons-collections.jar is not present in the
     * runtime classpath, and this class is the first one referenced.
     * Otherwise, the ClassNotFoundException thrown by ConvertUtils or
     * PropertyUtils can get masked.
     */
    private static FastHashMap dummy = new FastHashMap();

    /**
     * The debugging detail level for this component.
     * @deprecated BeanUtils now uses commons-logging for all log messages.
     *             Use your favorite logging tool to configure logging for
     *             this class.
     */
    private static int debug = 0;

    /**
     * @deprecated BeanUtils now uses commons-logging for all log messages.
     *             Use your favorite logging tool to configure logging for
     *             this class.
     */
    public static int getDebug() {
        return (debug);
    }

    /**
     * @deprecated BeanUtils now uses commons-logging for all log messages.
     *             Use your favorite logging tool to configure logging for
     *             this class.
     */
    public static void setDebug(int newDebug) {
        debug = newDebug;
    }

    // --------------------------------------------------------- Class Methods


    /**
     * <p>Clone a bean based on the available property getters and setters,
     * even if the bean class itself does not implement Cloneable.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#cloneBean
     */
    public static Object cloneBean(Object bean)
            throws IllegalAccessException, InstantiationException,
            InvocationTargetException, NoSuchMethodException {

        return BeanUtilsBean.getInstance().cloneBean(bean);

    }


    /**
     * <p>Copy property values from the origin bean to the destination bean
     * for all cases where the property names are the same.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#copyProperties
     */
    public static void copyProperties(Object dest, Object orig)
        throws IllegalAccessException, InvocationTargetException {
        
        BeanUtilsBean.getInstance().copyProperties(dest, orig);
    }


    /**
     * <p>Copy the specified property value to the specified destination bean,
     * performing any type conversion that is required.</p>    
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#copyProperty     
     */
    public static void copyProperty(Object bean, String name, Object value)
        throws IllegalAccessException, InvocationTargetException {

        BeanUtilsBean.getInstance().copyProperty(bean, name, value);
    }


    /**
     * <p>Return the entire set of properties for which the specified bean
     * provides a read method.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#describe 
     */
    public static Map describe(Object bean)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        return BeanUtilsBean.getInstance().describe(bean);
    }


    /**
     * <p>Return the value of the specified array property of the specified
     * bean, as a String array.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getArrayProperty 
     */
    public static String[] getArrayProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        return BeanUtilsBean.getInstance().getArrayProperty(bean, name);
    }


    /**
     * <p>Return the value of the specified indexed property of the specified
     * bean, as a String.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getIndexedProperty(Object, String)
     */
    public static String getIndexedProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {
        
        return BeanUtilsBean.getInstance().getIndexedProperty(bean, name);

    }


    /**
     * Return the value of the specified indexed property of the specified
     * bean, as a String.  The index is specified as a method parameter and
     * must *not* be included in the property name expression
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getIndexedProperty(Object, String, int)
     */
    public static String getIndexedProperty(Object bean,
                                            String name, int index)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

	return BeanUtilsBean.getInstance().getIndexedProperty(bean, name, index);

    }


    /**
     * </p>Return the value of the specified indexed property of the specified
     * bean, as a String.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getMappedProperty(Object, String)
     */
    public static String getMappedProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        return BeanUtilsBean.getInstance().getMappedProperty(bean, name);

    }


    /**
     * </p>Return the value of the specified mapped property of the specified
     * bean, as a String.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getMappedProperty(Object, String, String)
     */
    public static String getMappedProperty(Object bean,
                                           String name, String key)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        return BeanUtilsBean.getInstance().getMappedProperty(bean, name, key);

    }


    /**
     * <p>Return the value of the (possibly nested) property of the specified
     * name, for the specified bean, as a String.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getNestedProperty
     */
    public static String getNestedProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

	return BeanUtilsBean.getInstance().getNestedProperty(bean, name);

    }


    /**
     * <p>Return the value of the specified property of the specified bean,
     * no matter which property reference format is used, as a String.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getProperty
     */
    public static String getProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        return BeanUtilsBean.getInstance().getProperty(bean, name);

    }


    /**
     * <p>Return the value of the specified simple property of the specified
     * bean, converted to a String.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#getSimpleProperty
     */
    public static String getSimpleProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

	return BeanUtilsBean.getInstance().getSimpleProperty(bean, name);

    }


    /**
     * <p>Populate the JavaBeans properties of the specified bean, based on
     * the specified name/value pairs.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#populate
     */
    public static void populate(Object bean, Map properties)
        throws IllegalAccessException, InvocationTargetException {
        
        BeanUtilsBean.getInstance().populate(bean, properties);
    }


    /**
     * <p>Set the specified property value, performing type conversions as
     * required to conform to the type of the destination property.</p>
     *
     * <p>For more details see <code>BeanUtilsBean</code>.</p>
     *
     * @see BeanUtilsBean#setProperty
     */
    public static void setProperty(Object bean, String name, Object value)
        throws IllegalAccessException, InvocationTargetException {

        BeanUtilsBean.getInstance().setProperty(bean, name, value);
    }	
	public static void main(String[] args)  throws Exception{
		// TODO Auto-generated method stub
		//List<Field> list=BeanUtils.

	}	
}