一个android访问http资源的便捷工具类——HttpHelper
HttpHelper.java
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 | package com.newcj.net;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.net.*;import org.apache.http.util.ByteArrayBuffer;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.util.Log;/** * 帮助你访问 http 资源的工具类 * * @author <a href="mailto:newcj@qq.com">newcj</a> * @version 1.0 2010/5/9 */public final class HttpHelper { public final static String TAG = "HttpHelper"; private final static String CONTENT_TYPE = "application/x-www-form-urlencoded"; private final static String ACCEPT = "*/*"; private final static String USER_AGENT = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5"; /** * 1024 byte */ private final static int BUFFER_LENGTH = 1024; private String referer; private Cookies cookies; private int timeout = 300000; public HttpHelper() { cookies = new Cookies(); } /** * 获取超时时间，毫秒单位，默认为300000毫秒即5分钟 * * @return */ public int getTimeout() { return timeout; } /** * 设置超时时间 ReadTimeOut 与 ConnectTimeout 均设置为该超时时间，毫秒单位 * * @param timeout */ public void setTimeout(int timeout) { this.timeout = timeout; } /** * 获取 Referer * * @return */ public String getReferer() { return referer; } /** * 设置 Referer * * @return */ public void setReferer(String referer) { this.referer = referer; } /** * 以GET方法新建一个线程获取网页，编码方式为 gb2312，超时或编码错误返回null * * @param strUrl * 网页URL地址 * @param handler * 用于向发起本次调用的线程发送结果信息 * @param what * handler中的what标记 */ public void getHtmlByThread(String strUrl, Handler handler, int what) { getHtmlByThread(strUrl, null, false, "gb2312", handler, what); } /** * 以GET方法新建一个线程获取网页，超时或编码错误返回null * * @param strUrl * 网页URL地址 * @param encoding * 编码方式 * @param handler * 用于向发起本次调用的线程发送结果信息 * @param what * handler中的what标记 */ public void getHtmlByThread(String strUrl, String encoding, Handler handler, int what) { getHtmlByThread(strUrl, null, false, encoding, handler, what); } /** * 根据GET或POST方法新建一个线程获取网页，超时返回null * * @param strUrl * 网页URL地址 * @param strPost * POST 的数据 * @param isPost * 是否 POST，true 则为POST ,false 则为 GET * @param encoding * 编码方式 * @param handler * 用于向发起本次调用的线程发送结果信息 * @param what * handler中的what标记 */ public void getHtmlByThread(String strUrl, String strPost, boolean isPost, String encoding, Handler handler, int what) { if (handler == null) throw new NullPointerException("handler is null."); Thread t = new Thread(new Runner(strUrl, strPost, isPost, encoding, handler, what, Runner.TYPE_HTML)); t.setDaemon(true); t.start(); } /** * 以GET方法获取网页，编码方式为 gb2312，超时或编码错误返回null * * @param strUrl * 网页URL地址 * @return 返回网页的字符串 */ public String getHtml(String strUrl) { return getHtml(strUrl, null, false, "gb2312"); } /** * 以GET方法获取网页，超时或编码错误返回null * * @param strUrl * 网页URL地址 * @param encoding * 编码方式 * @return 返回网页的字符串 */ public String getHtml(String strUrl, String encoding) { return getHtml(strUrl, null, false, encoding); } /** * 根据GET或POST方法获取网页，超时返回null * * @param strUrl * 网页URL地址 * @param strPost * POST 的数据 * @param isPost * 是否 POST，true 则为POST ,false 则为 GET * @param encoding * 编码方式 * @return 返回网页的字符串 */ public String getHtml(String strUrl, String strPost, boolean isPost, String encoding) { String ret = null; try { byte[] data = getHtmlBytes(strUrl, strPost, isPost, encoding); if (data != null) ret = new String(data, encoding); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block } return ret; } /** * 根据GET或POST方法获取网络数据，超时返回null * * @param strUrl * 网页URL地址 * @param strPost * POST 的数据 * @param isPost * 是否POST，true则为POST,false则为 GET * @param encoding * 编码方式 * @return 返回bytes */ public byte[] getHtmlBytes(String strUrl, String strPost, boolean isPost, String encoding) { byte[] ret = null; HttpURLConnection httpCon = null; InputStream is = null; try { URL url = new URL(strUrl); httpCon = (HttpURLConnection) url.openConnection(); httpCon.setReadTimeout(timeout); httpCon.setConnectTimeout(timeout); httpCon.setUseCaches(false); httpCon.setInstanceFollowRedirects(true); httpCon.setRequestProperty("Referer", referer); httpCon.setRequestProperty("Content-Type", CONTENT_TYPE); httpCon.setRequestProperty("Accept", ACCEPT); httpCon.setRequestProperty("User-Agent", USER_AGENT); httpCon.setRequestProperty("Cookie", cookies.toString()); if (isPost) { httpCon.setDoOutput(true); httpCon.setRequestMethod("POST"); httpCon.connect(); OutputStream os = null; try { os = httpCon.getOutputStream(); os.write(URLEncoder.encode(strPost, encoding).getBytes()); os.flush(); } finally { if (os != null) os.close(); } } // 获取数据 is = httpCon.getInputStream(); ByteArrayBuffer baBuffer = null; byte[] buffer = new byte[BUFFER_LENGTH]; int rNum = 0; // 若读取的数据长度小于 BUFFER_LENGTH，说明读取的 // 内容小于 BUFFER_LENGTH 已经一次性读取完毕 // 这个时候并不用创建 ByteArrayBuffer // // 以上并不适用 // if ((rNum = is.read(buffer)) < BUFFER_LENGTH) { // ret = buffer; // } else { baBuffer = new ByteArrayBuffer(BUFFER_LENGTH << 1); // baBuffer.append(buffer, 0, BUFFER_LENGTH); while ((rNum = is.read(buffer)) != -1) { baBuffer.append(buffer, 0, rNum); } ret = baBuffer.toByteArray(); // } } catch (Exception e) { // TODO Auto-generated catch block Log.e(TAG, e.getMessage() + ":" + e.getCause()); } finally { if (is != null) { try { is.close(); } catch (IOException e) { // TODO Auto-generated catch block } } // 更新 Cookie if (httpCon != null) { cookies.putCookies(httpCon.getHeaderField("Set-Cookie")); // 更新 referer referer = strUrl; httpCon.disconnect(); } } return ret; } /** * 新建一个线程获取一张网页图片 * * @param strUrl * @param handler * 用于向发起本次调用的线程发送结果信息 * @param what * handler中的what标记 */ public void getBitmapByThread(String strUrl, Handler handler, int what) { if (handler == null) throw new NullPointerException("handler is null."); Thread t = new Thread(new Runner(strUrl, null, false, null, handler, what, Runner.TYPE_IMG)); t.setDaemon(true); t.start(); } /** * 获取一张网页图片 * * @param strUrl * 网页图片的URL地址 * @return */ public Bitmap getBitmap(String strUrl) { byte[] data = getHtmlBytes(strUrl, null, false, null); return BitmapFactory.decodeByteArray(data, 0, data.length); } private class Runner implements Runnable { public final static int TYPE_HTML = 1; public final static int TYPE_IMG = 2; private String strUrl; private String strPost; private boolean isPost; private String encoding; private Handler handler; private int what; private int type; public Runner(String strUrl, String strPost, boolean isPost, String encoding, Handler handler, int what, int type) { this.strUrl = strUrl; this.strPost = strPost; this.isPost = isPost; this.encoding = encoding; this.handler = handler; this.what = what; this.type = type; } @Override public void run() { // TODO Auto-generated method stub Object obj = null; switch (type) { case TYPE_HTML: obj = getHtml(strUrl, strPost, isPost, encoding); break; case TYPE_IMG: obj = getBitmap(strUrl); break; } synchronized (handler) { handler.sendMessage(handler.obtainMessage(what, obj)); } } }} |
Cookies.java
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 | package com.newcj.net;import java.util.HashMap;import java.util.Map.Entry;import java.util.Set;/** * 非同步保存Cookie的键值 * * @author SomeWind * */public class Cookies { private HashMap<String, String> hashMap; public Cookies() { hashMap = new HashMap<String, String>(); } /** * 清除 Cookies 里面的所有 Cookie 记录 */ public void clear() { hashMap.clear(); } /** * 根据 key 获取对应的 Cookie 值 * * @param key * 要获取的 Cookie 值的 key * @return 如果不存在 key 则返回 null */ public String getCookie(String key) { return hashMap.get(key); } /** * 在 Cookies 里设置一个 Cookie * * @param key * 要设置的 Cookie 的 key * @param value * 要设置的 Cookie 的 value */ public void putCookie(String key, String value) { hashMap.put(key, value); } /** * 在 Cookies 里面设置传入的 cookies * * @param cookies */ public void putCookies(String cookies) { if (cookies == null) return; String[] strCookies = cookies.split(";"); for (int i = 0; i < strCookies.length; i++) { for (int j = 0; j < strCookies[i].length(); j++) { if (strCookies[i].charAt(j) == '=') { this.putCookie( strCookies[i].substring(0, j), strCookies[i].substring(j + 1, strCookies[i].length())); } } } } /** * 获取 Cookies 的字符串 */ @Override public String toString() { // TODO Auto-generated method stub if (hashMap.isEmpty()) return ""; Set<Entry<String, String>> set = hashMap.entrySet(); StringBuilder sb = new StringBuilder(set.size() * 50); for (Entry<String, String> entry : set) { sb.append(String.format("%s=%s;", entry.getKey(), entry.getValue())); } sb.delete(sb.length() - 1, sb.length()); return sb.toString(); }} |
