1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/EntityUtils.java $ 3 * $Revision: 569637 $ 4 * $Date: 2007-08-25 00:36:59 -0700 (Sat, 25 Aug 2007) $ 5 * 6 * ==================================================================== 7 * Licensed to the Apache Software Foundation (ASF) under one 8 * or more contributor license agreements. See the NOTICE file 9 * distributed with this work for additional information 10 * regarding copyright ownership. The ASF licenses this file 11 * to you under the Apache License, Version 2.0 (the 12 * "License"); you may not use this file except in compliance 13 * with the License. You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, 18 * software distributed under the License is distributed on an 19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20 * KIND, either express or implied. See the License for the 21 * specific language governing permissions and limitations 22 * under the License. 23 * ==================================================================== 24 * 25 * This software consists of voluntary contributions made by many 26 * individuals on behalf of the Apache Software Foundation. For more 27 * information on the Apache Software Foundation, please see 28 * <http://www.apache.org/>. 29 * 30 */ 31 32 package org.apache.http.util; 33 34 import java.io.IOException; 35 import java.io.InputStream; 36 import java.io.InputStreamReader; 37 import java.io.Reader; 38 39 import org.apache.http.HeaderElement; 40 import org.apache.http.HttpEntity; 41 import org.apache.http.NameValuePair; 42 import org.apache.http.ParseException; 43 import org.apache.http.protocol.HTTP; 44 45 /** 46 * Static helpers for dealing with {@link HttpEntity entities}. 47 * 48 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 49 * 50 * @version $Revision: 569637 $ 51 * 52 * @since 4.0 53 */ 54 public final class EntityUtils { 55 56 /** Disabled default constructor. */ 57 private EntityUtils() { 58 } 59 60 public static byte[] toByteArray(final HttpEntity entity) throws IOException { 61 if (entity == null) { 62 throw new IllegalArgumentException("HTTP entity may not be null"); 63 } 64 InputStream instream = entity.getContent(); 65 if (instream == null) { 66 return new byte[] {}; 67 } 68 if (entity.getContentLength() > Integer.MAX_VALUE) { 69 throw new IllegalArgumentException("HTTP entity too large to be buffered in memory"); 70 } 71 int i = (int)entity.getContentLength(); 72 if (i < 0) { 73 i = 4096; 74 } 75 ByteArrayBuffer buffer = new ByteArrayBuffer(i); 76 try { 77 byte[] tmp = new byte[4096]; 78 int l; 79 while((l = instream.read(tmp)) != -1) { 80 buffer.append(tmp, 0, l); 81 } 82 } finally { 83 instream.close(); 84 } 85 return buffer.toByteArray(); 86 } 87 88 public static String getContentCharSet(final HttpEntity entity) 89 throws ParseException { 90 91 if (entity == null) { 92 throw new IllegalArgumentException("HTTP entity may not be null"); 93 } 94 String charset = null; 95 if (entity.getContentType() != null) { 96 HeaderElement values[] = entity.getContentType().getElements(); 97 if (values.length > 0) { 98 NameValuePair param = values[0].getParameterByName("charset"); 99 if (param != null) { 100 charset = param.getValue(); 101 } 102 } 103 } 104 return charset; 105 } 106 107 public static String toString( 108 final HttpEntity entity, final String defaultCharset) throws IOException, ParseException { 109 if (entity == null) { 110 throw new IllegalArgumentException("HTTP entity may not be null"); 111 } 112 InputStream instream = entity.getContent(); 113 if (instream == null) { 114 return ""; 115 } 116 if (entity.getContentLength() > Integer.MAX_VALUE) { 117 throw new IllegalArgumentException("HTTP entity too large to be buffered in memory"); 118 } 119 int i = (int)entity.getContentLength(); 120 if (i < 0) { 121 i = 4096; 122 } 123 String charset = getContentCharSet(entity); 124 if (charset == null) { 125 charset = defaultCharset; 126 } 127 if (charset == null) { 128 charset = HTTP.DEFAULT_CONTENT_CHARSET; 129 } 130 Reader reader = new InputStreamReader(instream, charset); 131 CharArrayBuffer buffer = new CharArrayBuffer(i); 132 try { 133 char[] tmp = new char[1024]; 134 int l; 135 while((l = reader.read(tmp)) != -1) { 136 buffer.append(tmp, 0, l); 137 } 138 } finally { 139 reader.close(); 140 } 141 return buffer.toString(); 142 } 143 144 public static String toString(final HttpEntity entity) 145 throws IOException, ParseException { 146 return toString(entity, null); 147 } 148 149 } 150
