jspruntimelibrary.java

业界著名的tomcat服务器的最新6.0的源代码。

	    method.invoke(bean, new Object[] { new Long(value) });
	} catch (Exception ex) {
	    throw new JasperException(ex);
	}	
    } 
    
    public static void handleSetProperty(Object bean, String prop,
					 double value)
	throws JasperException
    {
	try {
            Method method = getWriteMethod(bean.getClass(), prop);
	    method.invoke(bean, new Object[] { new Double(value) });
	} catch (Exception ex) {
	    throw new JasperException(ex);
	}	
    }
    
    public static void handleSetProperty(Object bean, String prop,
					 float value)
	throws JasperException
    {
	try {
            Method method = getWriteMethod(bean.getClass(), prop);
	    method.invoke(bean, new Object[] { new Float(value) });
	} catch (Exception ex) {
	    throw new JasperException(ex);
	}	
    }
    
    public static void handleSetProperty(Object bean, String prop,
					 char value)
	throws JasperException
    {
	try {
            Method method = getWriteMethod(bean.getClass(), prop);
	    method.invoke(bean, new Object[] { new Character(value) });
	} catch (Exception ex) {
	    throw new JasperException(ex);
	}	
    }

    public static void handleSetProperty(Object bean, String prop,
					 byte value)
	throws JasperException
    {
	try {
            Method method = getWriteMethod(bean.getClass(), prop);
	    method.invoke(bean, new Object[] { new Byte(value) });
	} catch (Exception ex) {
	    throw new JasperException(ex);
	}	
    }
    
    public static void handleSetProperty(Object bean, String prop,
					 boolean value)
	throws JasperException
    {
	try {
            Method method = getWriteMethod(bean.getClass(), prop);
	    method.invoke(bean, new Object[] { new Boolean(value) });
	} catch (Exception ex) {
	    throw new JasperException(ex);
	}	
    }
    
    public static Method getWriteMethod(Class beanClass, String prop)
    throws JasperException {
	Method method = null;	
        Class type = null;
	try {
	    java.beans.BeanInfo info
                = java.beans.Introspector.getBeanInfo(beanClass);
	    if ( info != null ) {
		java.beans.PropertyDescriptor pd[]
		    = info.getPropertyDescriptors();
		for (int i = 0 ; i < pd.length ; i++) {
		    if ( pd[i].getName().equals(prop) ) {
			method = pd[i].getWriteMethod();
			type   = pd[i].getPropertyType();
			break;
		    }
		}
            } else {        
                // just in case introspection silently fails.
                throw new JasperException(
                    Localizer.getMessage("jsp.error.beans.nobeaninfo",
					 beanClass.getName()));
            }
        } catch (Exception ex) {
            throw new JasperException (ex);
        }
        if (method == null) {
            if (type == null) {
		throw new JasperException(
                        Localizer.getMessage("jsp.error.beans.noproperty",
					     prop,
					     beanClass.getName()));
            } else {
		throw new JasperException(
		    Localizer.getMessage("jsp.error.beans.nomethod.setproperty",
					 prop,
					 type.getName(),
					 beanClass.getName()));
            }
        }
        return method;
    }

    public static Method getReadMethod(Class beanClass, String prop)
	    throws JasperException {

        Method method = null;        
        Class type = null;
        try {
            java.beans.BeanInfo info
                = java.beans.Introspector.getBeanInfo(beanClass);
            if ( info != null ) {
                java.beans.PropertyDescriptor pd[]
                    = info.getPropertyDescriptors();
                for (int i = 0 ; i < pd.length ; i++) {
                    if ( pd[i].getName().equals(prop) ) {
                        method = pd[i].getReadMethod();
                        type   = pd[i].getPropertyType();
                        break;
                    }
                }
            } else {        
                // just in case introspection silently fails.
		throw new JasperException(
                    Localizer.getMessage("jsp.error.beans.nobeaninfo",
					 beanClass.getName()));
	    }
	} catch (Exception ex) {
	    throw new JasperException (ex);
	}
        if (method == null) {
            if (type == null) {
		throw new JasperException(
                    Localizer.getMessage("jsp.error.beans.noproperty", prop,
					 beanClass.getName()));
            } else {
		throw new JasperException(
                    Localizer.getMessage("jsp.error.beans.nomethod", prop,
					 beanClass.getName()));
            }
        }

	return method;
    }

    //*********************************************************************
    // PropertyEditor Support

    public static Object getValueFromBeanInfoPropertyEditor(
		           Class attrClass, String attrName, String attrValue,
			   Class propertyEditorClass) 
	throws JasperException 
    {
	try {
	    PropertyEditor pe = (PropertyEditor)propertyEditorClass.newInstance();
	    pe.setAsText(attrValue);
	    return pe.getValue();
	} catch (Exception ex) {
	    throw new JasperException(
                Localizer.getMessage("jsp.error.beans.property.conversion",
				     attrValue, attrClass.getName(), attrName,
				     ex.getMessage()));
	}
    }

    public static Object getValueFromPropertyEditorManager(
	             Class attrClass, String attrName, String attrValue) 
	throws JasperException 
    {
	try {
	    PropertyEditor propEditor = 
		PropertyEditorManager.findEditor(attrClass);
	    if (propEditor != null) {
		propEditor.setAsText(attrValue);
		return propEditor.getValue();
	    } else {
		throw new IllegalArgumentException(
                    Localizer.getMessage("jsp.error.beans.propertyeditor.notregistered"));
	    }
	} catch (IllegalArgumentException ex) {
	    throw new JasperException(
                Localizer.getMessage("jsp.error.beans.property.conversion",
				     attrValue, attrClass.getName(), attrName,
				     ex.getMessage()));
	}
    }


    // ************************************************************************
    // General Purpose Runtime Methods
    // ************************************************************************


    /**
     * Convert a possibly relative resource path into a context-relative
     * resource path that starts with a '/'.
     *
     * @param request The servlet request we are processing
     * @param relativePath The possibly relative resource path
     */
    public static String getContextRelativePath(ServletRequest request,
                                                String relativePath) {

        if (relativePath.startsWith("/"))
            return (relativePath);
        if (!(request instanceof HttpServletRequest))
            return (relativePath);
        HttpServletRequest hrequest = (HttpServletRequest) request;
        String uri = (String)
            request.getAttribute("javax.servlet.include.servlet_path");
        if (uri != null) {
            String pathInfo = (String)
                request.getAttribute("javax.servlet.include.path_info");
            if (pathInfo == null) {
                if (uri.lastIndexOf('/') >= 0) 
                    uri = uri.substring(0, uri.lastIndexOf('/'));
            }
        }
        else {
            uri = hrequest.getServletPath();
            if (uri.lastIndexOf('/') >= 0) 
                uri = uri.substring(0, uri.lastIndexOf('/'));
        }
        return uri + '/' + relativePath;

    }


    /**
     * Perform a RequestDispatcher.include() operation, with optional flushing
     * of the response beforehand.
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are processing
     * @param relativePath The relative path of the resource to be included
     * @param out The Writer to whom we are currently writing
     * @param flush Should we flush before the include is processed?
     *
     * @exception IOException if thrown by the included servlet
     * @exception ServletException if thrown by the included servlet
     */
    public static void include(ServletRequest request,
                               ServletResponse response,
                               String relativePath,
                               JspWriter out,
                               boolean flush)
        throws IOException, ServletException {

        if (flush && !(out instanceof BodyContent))
            out.flush();

        // FIXME - It is tempting to use request.getRequestDispatcher() to
        // resolve a relative path directly, but Catalina currently does not
        // take into account whether the caller is inside a RequestDispatcher
        // include or not.  Whether Catalina *should* take that into account
        // is a spec issue currently under review.  In the mean time,
        // replicate Jasper's previous behavior

        String resourcePath = getContextRelativePath(request, relativePath);
        RequestDispatcher rd = request.getRequestDispatcher(resourcePath);

        rd.include(request,
                   new ServletResponseWrapperInclude(response, out));

    }

    /**
     * URL encodes a string, based on the supplied character encoding.
     * This performs the same function as java.next.URLEncode.encode
     * in J2SDK1.4, and should be removed if the only platform supported
     * is 1.4 or higher.
     * @param s The String to be URL encoded.
     * @param enc The character encoding 
     * @return The URL encoded String
     */
    public static String URLEncode(String s, String enc) {

	if (s == null) {
	    return "null";
	}

	if (enc == null) {
	    enc = "ISO-8859-1";	// The default request encoding 
	}

	StringBuffer out = new StringBuffer(s.length());
	ByteArrayOutputStream buf = new ByteArrayOutputStream();
	OutputStreamWriter writer = null;
	try {
	    writer = new OutputStreamWriter(buf, enc);
	} catch (java.io.UnsupportedEncodingException ex) {
	    // Use the default encoding?
	    writer = new OutputStreamWriter(buf);
	}
	
	for (int i = 0; i < s.length(); i++) {
	    int c = s.charAt(i);
	    if (c == ' ') {
		out.append('+');
	    } else if (isSafeChar(c)) {
		out.append((char)c);
	    } else {
		// convert to external encoding before hex conversion
		try {
		    writer.write(c);
		    writer.flush();
		} catch(IOException e) {
		    buf.reset();
		    continue;
		}
		byte[] ba = buf.toByteArray();
		for (int j = 0; j < ba.length; j++) {
		    out.append('%');
		    // Converting each byte in the buffer
		    out.append(Character.forDigit((ba[j]>>4) & 0xf, 16));
		    out.append(Character.forDigit(ba[j] & 0xf, 16));
		}
		buf.reset();
	    }
	}
	return out.toString();
    }

    private static boolean isSafeChar(int c) {
	if (c >= 'a' && c <= 'z') {
	    return true;
	}
	if (c >= 'A' && c <= 'Z') {
	    return true;
	}
	if (c >= '0' && c <= '9') {
	    return true;
	}
	if (c == '-' || c == '_' || c == '.' || c == '!' ||
	    c == '~' || c == '*' || c == '\'' || c == '(' || c == ')') {
	    return true;
	}
	return false;
    }

}