Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  *
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at packager/legal/LICENSE.txt.
  *
  * GPL Classpath Exception:
  * Oracle designates this particular file as subject to the "Classpath"
  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
  *
  * Modifications:
  * If applicable, add the following below the License Header, with the fields
  * enclosed by brackets [] replaced by your own identifying information:
  * "Portions Copyright [year] [name of copyright owner]"
  *
  * Contributor(s):
  * If you wish your version of this file to be governed by only the CDDL or
  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
  *
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  * Copyright 2004 The Apache Software Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package javax.servlet.http;
 

Deprecated:
As of Java(tm) Servlet API 2.3. These methods were only useful with the default encoding and have been moved to the request interfaces.
 
 public class HttpUtils {
 
     private static final String LSTRING_FILE =
 	"javax.servlet.http.LocalStrings";
     private static ResourceBundle lStrings =
 	ResourceBundle.getBundle();
        
    
    
Constructs an empty HttpUtils object.
 
     public HttpUtils() {}
    

    
Parses a query string passed from the client to the server and builds a HashTable object with key-value pairs. The query string should be in the form of a string packaged by the GET or POST method, that is, it should have key-value pairs in the form key=value, with each pair separated from the next by a & character.

A key can appear more than once in the query string with different values. However, the key appears only once in the hashtable, with its value being an array of strings containing the multiple values sent by the query string.

The keys and values in the hashtable are stored in their decoded form, so any + characters are converted to spaces, and characters sent in hexadecimal notation (like %xx) are converted to ASCII characters.

Parameters:
s a string containing the query to be parsed
Returns:
a HashTable object built from the parsed key-value pairs
Throws:
java.lang.IllegalArgumentException if the query string is invalid
    public static Hashtable<StringString[]> parseQueryString(String s) {
        String valArray[] = null;
        if (s == null) {
            throw new IllegalArgumentException();
        }
        Hashtable<StringString[]> ht = new Hashtable<StringString[]>();
        StringBuilder sb = new StringBuilder();
        StringTokenizer st = new StringTokenizer(s"&");
        while (st.hasMoreTokens()) {
        String pair = st.nextToken();
        int pos = pair.indexOf('=');
        if (pos == -1) {
            // XXX
            // should give more detail about the illegal argument
            throw new IllegalArgumentException();
        }
        String key = parseName(pair.substring(0, pos), sb);
        String val = parseName(pair.substring(pos+1, pair.length()), sb);
        if (ht.containsKey(key)) {
            String oldVals[] = ht.get(key);
            valArray = new String[oldVals.length + 1];
            for (int i = 0; i < oldVals.lengthi++) {
                valArray[i] = oldVals[i];
            }
            valArray[oldVals.length] = val;
        } else {
            valArray = new String[1];
            valArray[0] = val;
        }
        ht.put(keyvalArray);
    }
	return ht;
    }


    
Parses data from an HTML form that the client sends to the server using the HTTP POST method and the application/x-www-form-urlencoded MIME type.

The data sent by the POST method contains key-value pairs. A key can appear more than once in the POST data with different values. However, the key appears only once in the hashtable, with its value being an array of strings containing the multiple values sent by the POST method.

The keys and values in the hashtable are stored in their decoded form, so any + characters are converted to spaces, and characters sent in hexadecimal notation (like %xx) are converted to ASCII characters.

Parameters:
len an integer specifying the length, in characters, of the ServletInputStream object that is also passed to this method
in the ServletInputStream object that contains the data sent from the client
Returns:
a HashTable object built from the parsed key-value pairs
Throws:
java.lang.IllegalArgumentException if the data sent by the POST method is invalid
    public static Hashtable<StringString[]> parsePostData(int len
                ServletInputStream in) {
	// XXX
	// should a length of 0 be an IllegalArgumentException
	if (len <=0) {
            // cheap hack to return an empty hash
	    return new Hashtable<StringString[]>(); 
        }
	if (in == null) {
	    throw new IllegalArgumentException();
	}
	//
	// Make sure we read the entire POSTed body.
	//
        byte[] postedBytes = new byte [len];
        try {
            int offset = 0;
       
	    do {
		int inputLen = in.read (postedBytesoffsetlen - offset);
		if (inputLen <= 0) {
		    String msg = .getString("err.io.short_read");
		    throw new IllegalArgumentException (msg);
		}
		offset += inputLen;
	    } while ((len - offset) > 0);
catch (IOException e) {
	    throw new IllegalArgumentException(e.getMessage());
	}
        // XXX we shouldn't assume that the only kind of POST body
        // is FORM data encoded using ASCII or ISO Latin/1 ... or
        // that the body should always be treated as FORM data.
        //
        try {
            String postedBody = new String(postedBytes, 0, len"8859_1");
            return parseQueryString(postedBody);
        } catch (java.io.UnsupportedEncodingException e) {
            // XXX function should accept an encoding parameter & throw this
            // exception.  Otherwise throw something expected.
            throw new IllegalArgumentException(e.getMessage());
        }
    }
    /*
     * Parse a name in the query string.
     */
    private static String parseName(String sStringBuilder sb) {
        sb.setLength(0);
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i); 
            switch (c) {
                case '+':
                    sb.append(' ');
                    break;
                case '%':
                    try {
                        sb.append((char) Integer.parseInt(s.substring(i+1, i+3), 
                                16));
                        i += 2;
                    } catch (NumberFormatException e) {
                        // XXX
                        // need to be more specific about illegal arg
                        throw new IllegalArgumentException();
                    } catch (StringIndexOutOfBoundsException e) {
                        String rest  = s.substring(i);
                        sb.append(rest);
                        if (rest.length()==2)
                            i++;
                        }
                        break;
                default:
                    sb.append(c);
                    break;
            }
        }
        return sb.toString();
    }


    
Reconstructs the URL the client used to make the request, using information in the HttpServletRequest object. The returned URL contains a protocol, server name, port number, and server path, but it does not include query string parameters.

Because this method returns a StringBuffer, not a string, you can modify the URL easily, for example, to append query parameters.

This method is useful for creating redirect messages and for reporting errors.

Parameters:
req a HttpServletRequest object containing the client's request
Returns:
a StringBuffer object containing the reconstructed URL
    public static StringBuffer getRequestURL (HttpServletRequest req) {
        StringBuffer url = new StringBuffer();
        String scheme = req.getScheme ();
        int port = req.getServerPort ();
        String urlPath = req.getRequestURI();
        //String		servletPath = req.getServletPath ();
        //String		pathInfo = req.getPathInfo ();
        url.append (scheme);		// http, https
        url.append ("://");
        url.append (req.getServerName ());
        if ((scheme.equals ("http") && port != 80)
        || (scheme.equals ("https") && port != 443)) {
            url.append (':');
            url.append (req.getServerPort ());
        }
        //if (servletPath != null)
        //    url.append (servletPath);
        //if (pathInfo != null)
        //    url.append (pathInfo);
        url.append(urlPath);
        return url;
    }
New to GrepCode? Check out our FAQ X