1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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;
import java.io.IOException;
import java.util.Hashtable;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
import javax.servlet.ServletInputStream;
/**
* @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.
*/
@SuppressWarnings("dep-ann") // Spec API does not use @Deprecated
public class HttpUtils {
private static final String LSTRING_FILE =
"javax.servlet.http.LocalStrings";
private static final ResourceBundle lStrings =
ResourceBundle.getBundle(LSTRING_FILE);
/**
* Constructs an empty <code>HttpUtils</code> object.
*
*/
public HttpUtils() {
// NOOP
}
/**
*
* Parses a query string passed from the client to the
* server and builds a <code>HashTable</code> 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 <i>key=value</i>,
* with each pair separated from the next by a & character.
*
* <p>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.
*
* <p>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 <i>%xx</i>) are
* converted to ASCII characters.
*
* @param s a string containing the query to be parsed
*
* @return a <code>HashTable</code> object built
* from the parsed key-value pairs
*
* @exception IllegalArgumentException if the query string
* is invalid
*
*/
public static Hashtable<String,String[]> parseQueryString(String s) {
String valArray[] = null;
if (s == null) {
throw new IllegalArgumentException();
}
Hashtable<String,String[]> ht = new Hashtable<>();
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.length; i++)
valArray[i] = oldVals[i];
valArray[oldVals.length] = val;
} else {
valArray = new String[1];
valArray[0] = val;
}
ht.put(key, valArray);
}
return ht;
}
/**
*
* Parses data from an HTML form that the client sends to
* the server using the HTTP POST method and the
* <i>application/x-www-form-urlencoded</i> MIME type.
*
* <p>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.
*
* <p>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 <i>%xx</i>) are
* converted to ASCII characters.
*
*
*
* @param len an integer specifying the length,
* in characters, of the
* <code>ServletInputStream</code>
* object that is also passed to this
* method
*
* @param in the <code>ServletInputStream</code>
* object that contains the data sent
* from the client
*
* @return a <code>HashTable</code> object built
* from the parsed key-value pairs
*
*
* @exception IllegalArgumentException if the data
* sent by the POST method is invalid
*
*/
public static Hashtable<String,String[]> parsePostData(int len,
ServletInputStream in) {
// XXX
// should a length of 0 be an IllegalArgumentException
// cheap hack to return an empty hash
if (len <=0)
return new Hashtable<>();
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 (postedBytes, offset, len - offset);
if (inputLen <= 0) {
String msg = lStrings.getString("err.io.short_read");
throw new IllegalArgumentException (msg);
}
offset += inputLen;
} while ((len - offset) > 0);
} catch (IOException e) {
throw new IllegalArgumentException(e.getMessage(), e);
}
// 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(), e);
}
}
/*
* Parse a name in the query string.
*/
private static String parseName(String s, StringBuilder 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 <code>HttpServletRequest</code> object.
* The returned URL contains a protocol, server name, port
* number, and server path, but it does not include query
* string parameters.
*
* <p>Because this method returns a <code>StringBuffer</code>,
* not a string, you can modify the URL easily, for example,
* to append query parameters.
*
* <p>This method is useful for creating redirect messages
* and for reporting errors.
*
* @param req a <code>HttpServletRequest</code> object
* containing the client's request
*
* @return a <code>StringBuffer</code> 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();
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 ());
}
url.append(urlPath);
return url;
}
}
|