beanproperty.java

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\
 *

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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/Servlet/org/pi3/jsp/runtime/BeanProperty.java,v $
 * $Date: 2003/05/13 18:42:20 $
 *
 Description:
	Helper class for read/write access of bean properties.

\*____________________________________________________________________________*/
 
package org.pi3.jsp.runtime;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Array;
import java.lang.IllegalAccessException;
import java.beans.PropertyDescriptor;
import java.beans.IntrospectionException;
import javax.servlet.ServletRequest;
import java.util.Enumeration;

public class BeanProperty {


    private static Object convert(String s, Class t) {
        try {
            if ( t.equals(Boolean.class) || t.equals(Boolean.TYPE) ) {
			    if (s == null) s = "false";
                return new Boolean(s);
            } else if ( t.equals(Byte.class) || t.equals(Byte.TYPE) ) {
                return new Byte(s);
            } else if (t.equals(Character.class) || t.equals(Character.TYPE)) {
                return s.length() > 0 ? new Character(s.charAt(0)) : null;
            } else if ( t.equals(Short.class) || t.equals(Short.TYPE) ) {
                return new Short(s);
            } else if ( t.equals(Integer.class) || t.equals(Integer.TYPE) ) {
                return new Integer(s);
            } else if ( t.equals(Float.class) || t.equals(Float.TYPE) ) {
                return new Float(s);
            } else if ( t.equals(Long.class) || t.equals(Long.TYPE) ) {
                return new Long(s);
            } else if ( t.equals(Double.class) || t.equals(Double.TYPE) ) {
                return new Double(s);
            } else if ( t.equals(String.class) ) {
                return s;
            }
        } catch (Exception ex) {
//            throw new Exception(ex);
        }
        return s;
    }


private static void _set(Object bean, String property, String value, ServletRequest request) 
    {
	try
        {
        StringBuffer sb = new StringBuffer("set");
        sb.append( property.substring( 0, 1 ).toUpperCase() );
        sb.append( property.substring( 1 ) );
        PropertyDescriptor pd = new PropertyDescriptor( property, bean.getClass(), null, sb.toString() );
		Class type = pd.getPropertyType();
        Method m = pd.getWriteMethod();

		if ( type.isArray() )
            {
		    Class t = type.getComponentType();
		    String[] values = request.getParameterValues(property);
		    if( values == null ) return;
		    if ( t.equals(String.class) )
			    {
                m.invoke(bean, new Object[] { values });
                }
			else
                {
                Object arr = Array.newInstance(t, values.length); 
                for ( int i = 0; i < values.length; i++ ) Array.set(arr, i, values[i]);
                m.invoke(bean, new Object[] { arr } );
                }
		    }
		else
		    {
            if(value == null || value.equals("")) return;
            Object o = convert(value, type);
            if ( o != null ) m.invoke(bean, new Object[] { o });
            }
        }
    catch (Exception ex)
        {
//      throw new Exception(ex);
        }
    }
    
    public static String get( Object bean, String property )
      throws IllegalAccessException, IntrospectionException, InvocationTargetException {
        StringBuffer sb = new StringBuffer("get");
        sb.append( property.substring( 0, 1 ).toUpperCase() );
        sb.append( property.substring( 1 ) );
        PropertyDescriptor pd = new PropertyDescriptor( property, bean.getClass(), sb.toString(), null );
        Method m = pd.getReadMethod();
        Object O = m.invoke( bean, null );
        return ( O != null ) ? O.toString() : null;
    }

    public static void set( Object bean, String property, String value )
      throws IllegalAccessException, IntrospectionException, InvocationTargetException {
        StringBuffer sb = new StringBuffer("set");
        sb.append( property.substring( 0, 1 ).toUpperCase() );
        sb.append( property.substring( 1 ) );
        PropertyDescriptor pd = new PropertyDescriptor( property, bean.getClass(), null, sb.toString() );
		Class type = pd.getPropertyType();
        Method m = pd.getWriteMethod();
        m.invoke( bean, new Object[] { convert(value, type) } );
    }

    public static void set( Object bean, String property, ServletRequest request )
      throws IllegalAccessException, IntrospectionException, InvocationTargetException {
	    if ( property.equals("*") )
		    {
            Enumeration e = request.getParameterNames();
            while ( e.hasMoreElements() )
                {
                String name  = (String) e.nextElement();
                String value = request.getParameter(name);
                if (value == null || value.equals("")) continue;
                _set(bean, name, value, request);
                }
            }
		else
		    {
            String value = request.getParameter(property);
            _set(bean, property, value, request);
			}
    }

}