set a bean's property, the Class of the property must be the same as the Class of v; - Java Reflection

Java examples for Reflection:Java Bean

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Description

set a bean's property, the Class of the property must be the same as the Class of v;

Demo Code

/**/*from w w w  .  ja v  a2s.  c om*/
 *all rights reserved,@copyright 2003
 */
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashMap;

public class Main{
    public static void main(String[] argv) throws Exception{
        Object bean = "java2s.com";
        String propertyName = "java2s.com";
        Object v = "java2s.com";
        setBeanProperty(bean,propertyName,v);
    }
    public static final String PROPERTY_SET_METHOD_PREFIX = "set";
    /**
     * set a bean's property, the Class of the property must be the same as the Class
     * of v;
     *
     * @param bean         the target bean object;
     * @param propertyName the property name;
     * @param v            the property value;
     * @throws com.cots.bean.NoSuchPropertyException if the bean has no this property;
     * @throws SetPropertyException    if has no acceess to this property,or nested Exception is thrown when
     *                                 call the setMethod
     */
    public static void setBeanProperty(Object bean, String propertyName,
            Object v) throws NoSuchPropertyException, SetPropertyException {
        Class propertyClass = v.getClass();
        setBeanProperty(bean, propertyName, propertyClass, v);
    }
    /**
     * set a bean's property.
     *
     * @param bean          the target bean object;
     * @param propertyName  the property name;
     * @param propertyClass the Class of the property;
     * @param v             the property value;
     * @throws NoSuchPropertyException if the bean has no this property;
     * @throws com.cots.bean.SetPropertyException    if has no acceess to this property,or nested Exception is thrown when
     *                                 call the setMethod
     */
    public static void setBeanProperty(Object bean, String propertyName,
            Class propertyClass, Object v) throws NoSuchPropertyException,
            SetPropertyException {
        String methodName = BeanUtil.PROPERTY_SET_METHOD_PREFIX
                + Character.toUpperCase(propertyName.charAt(0))
                + propertyName.substring(1);
        Class[] clz = new Class[1];
        clz[0] = propertyClass;
        try {
            Method m = getMethod(bean, methodName, clz);
            m.invoke(bean, new Object[] { v });
        } catch (NoSuchMethodException e) {
            throw new NoSuchPropertyException(bean.getClass().getName(),
                    propertyName, propertyClass.getName());
        } catch (IllegalAccessException e) {
            throw new SetPropertyException("illegal access to property:"
                    + propertyName);
        } catch (InvocationTargetException e) {
            throw new SetPropertyException(e.getTargetException()
                    .getMessage());
        }
    }
    /**
     *
     *
     * @param o
     * @param methodName
     * @param paramTypes
     * @return
     * @throws NoSuchMethodException
     */
    public static Method getMethod(Object o, String methodName,
            Class[] paramTypes) throws NoSuchMethodException {
        Class clz = o.getClass();
        return clz.getMethod(methodName, paramTypes);
    }
    /**
     *
     *
     * @param clz
     * @param methodName
     * @param paramTypes
     * @return
     * @throws NoSuchMethodException
     */
    public static Method getMethod(Class clz, String methodName,
            Class[] paramTypes) throws NoSuchMethodException {
        return clz.getMethod(methodName, paramTypes);
    }
}

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