一个android访问http资源的便捷工具类——HttpHelper
16lz
2021-01-23
HttpHelper.java
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
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(); }} 更多相关文章
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