几个常用的JAVA类(坚持“不要重复发明轮子”的原则,留着重用)
2012-03-27 21:27
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(1)从输入流中获取数据并以字节数组返回,这种输入流可以来自Android本地也可以来自网络
(2)通过Android客户端上传数据到服务器:可以上传简单的表单,也可以方便的上传带有附件的文件,此类远远比Android自身的HttpClient更高效、更易于使用
(3)下面的类是文件下载类,支持文件的多线程断点续传,使用该类的即可安全、高效的下载任何类型的二进制文件:
转自:http://www.cnblogs.com/guoshiandroid/archive/2010/06/05/1752150.html
import java.io.ByteArrayOutputStream; import java.io.InputStream; public class StreamTool { /** * 从输入流获取数据 * @param inputStream * @return * @throws Exception */ public static byte[] readInputStream(InputStream inputStream) throws Exception { byte[] buffer = new byte[1024]; //你可以根据实际需要调整缓存大小 int len = -1; ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); while( (len = inputStream.read(buffer)) != -1 ){ outSteam.write(buffer, 0, len); } outSteam.close(); inputStream.close(); return outSteam.toByteArray(); } }
(2)通过Android客户端上传数据到服务器:可以上传简单的表单,也可以方便的上传带有附件的文件,此类远远比Android自身的HttpClient更高效、更易于使用
import java.io.DataOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; public class HttpRequester { /** * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能: * <FORM METHOD=POST ACTION="http://192.168.0.200:8080/ssi/fileload/test.do" enctype="multipart/form-data"> <INPUT TYPE="text" NAME="name"> <INPUT TYPE="text" NAME="id"> <input type="file" name="imagefile"/> <input type="file" name="zip"/> </FORM> * @param actionUrl 上传路径(注:避免使用localhost或127.0.0.1这样的路径测试,因为它会指向手机模拟器,你可以使用http://www.cnblogs.com/guoshiandroid或http://192.168.1.10:8080这样的路径测试) * @param params 请求参数 key为参数名,value为参数值 * @param file 上传文件 */ public static String post(String actionUrl, Map<String, String> params, FormFile[] files) { try { String BOUNDARY = "---------7d4a6d158c9"; //数据分隔线 String MULTIPART_FORM_DATA = "multipart/form-data"; URL url = new URL(actionUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5* 1000); conn.setDoInput(true);//允许输入 conn.setDoOutput(true);//允许输出 conn.setUseCaches(false);//不使用Cache conn.setRequestMethod("POST"); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("Charset", "UTF-8"); conn.setRequestProperty("Content-Type", MULTIPART_FORM_DATA + "; boundary=" + BOUNDARY); StringBuilder sb = new StringBuilder(); for (Map.Entry<String, String> entry : params.entrySet()) {//构建表单字段内容 sb.append("--"); sb.append(BOUNDARY); sb.append("\r\n"); sb.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n"); sb.append(entry.getValue()); sb.append("\r\n"); } DataOutputStream outStream = new DataOutputStream(conn.getOutputStream()); outStream.write(sb.toString().getBytes());//发送表单字段数据 for(FormFile file : files){//发送文件数据 StringBuilder split = new StringBuilder(); split.append("--"); split.append(BOUNDARY); split.append("\r\n"); split.append("Content-Disposition: form-data;name=\""+ file.getFormname()+"\";filename=\""+ file.getFilname() + "\"\r\n"); split.append("Content-Type: "+ file.getContentType()+"\r\n\r\n"); outStream.write(split.toString().getBytes()); if(file.getInStream()!=null){ byte[] buffer = new byte[1024]; int len = 0; while((len = file.getInStream().read(buffer))!=-1){ outStream.write(buffer, 0, len); } file.getInStream().close(); }else{ outStream.write(file.getData(), 0, file.getData().length); } outStream.write("\r\n".getBytes()); } byte[] end_data = ("--" + BOUNDARY + "--\r\n").getBytes();//数据结束标志 outStream.write(end_data); outStream.flush(); int cah = conn.getResponseCode(); if (cah != 200) throw new RuntimeException("请求url失败"); InputStream is = conn.getInputStream(); int ch; StringBuilder b = new StringBuilder(); while( (ch = is.read()) != -1 ){ b.append((char)ch); } outStream.close(); conn.disconnect(); return b.toString(); } catch (Exception e) { throw new RuntimeException(e); } } /** * 提交数据到服务器 * @param actionUrl 上传路径(注:避免使用localhost或127.0.0.1这样的路径测试,因为它会指向手机模拟器,你可以使用http://www.cnblogs.com/guoshiandroid或http://192.168.1.10:8080这样的路径测试) * @param params 请求参数 key为参数名,value为参数值 * @param file 上传文件 */ public static String post(String actionUrl, Map<String, String> params, FormFile file) { return post(actionUrl, params, new FormFile[]{file}); } public static byte[] postFromHttpClient(String path, Map<String, String> params, String encode) throws Exception{ List<NameValuePair> formparams = new ArrayList<NameValuePair>();//用于存放请求参数 for(Map.Entry<String, String> entry : params.entrySet()){ formparams.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8"); HttpPost httppost = new HttpPost(path); httppost.setEntity(entity); HttpClient httpclient = new DefaultHttpClient();//看作是浏览器 HttpResponse response = httpclient.execute(httppost);//发送post请求 return StreamTool.readInputStream(response.getEntity().getContent()); } /** * 发送请求 * @param path 请求路径 * @param params 请求参数 key为参数名称 value为参数值 * @param encode 请求参数的编码 */ public static byte[] post(String path, Map<String, String> params, String encode) throws Exception{ //String params = "method=save&name="+ URLEncoder.encode("国士工作室", "UTF-8")+ "&age=28&";//需要发送的参数 StringBuilder parambuilder = new StringBuilder(""); if(params!=null && !params.isEmpty()){ for(Map.Entry<String, String> entry : params.entrySet()){ parambuilder.append(entry.getKey()).append("=") .append(URLEncoder.encode(entry.getValue(), encode)).append("&"); } parambuilder.deleteCharAt(parambuilder.length()-1); } byte[] data = parambuilder.toString().getBytes(); URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setDoOutput(true);//允许对外发送请求参数 conn.setUseCaches(false);//不进行缓存 conn.setConnectTimeout(5 * 1000); conn.setRequestMethod("POST"); //下面设置http请求头 conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*"); conn.setRequestProperty("Accept-Language", "zh-CN"); conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", String.valueOf(data.length)); conn.setRequestProperty("Connection", "Keep-Alive"); //发送参数 DataOutputStream outStream = new DataOutputStream(conn.getOutputStream()); outStream.write(data);//把参数发送出去 outStream.flush(); outStream.close(); if(conn.getResponseCode()==200){ return StreamTool.readInputStream(conn.getInputStream()); } return null; } }
(3)下面的类是文件下载类,支持文件的多线程断点续传,使用该类的即可安全、高效的下载任何类型的二进制文件:
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.RandomAccessFile; import java.net.HttpURLConnection; import java.net.URL; import java.util.LinkedHashMap; import java.util.Map; import java.util.Properties; import java.util.UUID; import java.util.concurrent.ConcurrentHashMap; import java.util.regex.Matcher; import java.util.regex.Pattern; import cn.itcast.service.FileService; import android.content.Context; import android.util.Log; /** * 文件下载器 */ public class FileDownloader { private Context context; private FileService fileService; private static final String TAG = "FileDownloader"; /* 已下载文件大小 */ private int downloadSize = 0; /* 原始文件大小 */ private int fileSize = 0; /* 线程数 */ private DownloadThread[] threads; /* 下载路径 */ private URL url; /* 本地保存文件 */ private File saveFile; /* 下载记录文件 */ private File logFile; /* 缓存各线程最后下载的位置*/ private Map<Integer, Integer> data = new ConcurrentHashMap<Integer, Integer>(); /* 每条线程下载的大小 */ private int block; private String downloadUrl;//下载路径 /** * 获取线程数 */ public int getThreadSize() { return threads.length; } /** * 获取文件大小 * @return */ public int getFileSize() { return fileSize; } /** * 累计已下载大小 * @param size */ protected synchronized void append(int size) { downloadSize += size; } /** * 更新指定线程最后下载的位置 * @param threadId 线程id * @param pos 最后下载的位置 */ protected void update(int threadId, int pos) { this.data.put(threadId, pos); } /** * 保存记录文件 */ protected synchronized void saveLogFile() { this.fileService.update(this.downloadUrl, this.data); } /** * 构建文件下载器 * @param downloadUrl 下载路径 * @param fileSaveDir 文件保存目录 * @param threadNum 下载线程数 */ public FileDownloader(Context context, String downloadUrl, File fileSaveDir, int threadNum) { try { this.context = context; this.downloadUrl = downloadUrl; fileService = new FileService(context); this.url = new URL(downloadUrl); if(!fileSaveDir.exists()) fileSaveDir.mkdirs(); this.threads = new DownloadThread[threadNum]; HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(6*1000); conn.setRequestMethod("GET"); conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*"); conn.setRequestProperty("Accept-Language", "zh-CN"); conn.setRequestProperty("Referer", downloadUrl); conn.setRequestProperty("Charset", "UTF-8"); conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"); conn.setRequestProperty("Connection", "Keep-Alive"); conn.connect(); printResponseHeader(conn); if (conn.getResponseCode()==200) { this.fileSize = conn.getContentLength();//根据响应获取文件大小 if (this.fileSize <= 0) throw new RuntimeException("1无法获知文件大小 "); String filename = getFileName(conn); this.saveFile = new File(fileSaveDir, filename);/* 保存文件 */ Map<Integer, Integer> logdata = fileService.getData(downloadUrl); if(logdata.size()>0){ for(Map.Entry<Integer, Integer> entry : logdata.entrySet()) data.put(entry.getKey(), entry.getValue()+1); } this.block = this.fileSize / this.threads.length + 1; if(this.data.size()==this.threads.length){ for (int i = 0; i < this.threads.length; i++) { this.downloadSize += this.data.get(i+1)-(this.block * i); } print("已经下载的长度"+ this.downloadSize); } }else{ throw new RuntimeException("2服务器响应错误 "); } } catch (Exception e) { print(e.toString()); throw new RuntimeException("3连接不到下载路径 "); } } /** * 获取文件名 */ private String getFileName(HttpURLConnection conn) { String filename = this.url.toString().substring(this.url.toString().lastIndexOf('/') + 1); if(filename==null || "".equals(filename.trim())){//如果获取不到文件名称 for (int i = 0;; i++) { String mine = conn.getHeaderField(i); if (mine == null) break; if("content-disposition".equals(conn.getHeaderFieldKey(i).toLowerCase())){ Matcher m = Pattern.compile(".*filename=(.*)").matcher(mine.toLowerCase()); if(m.find()) return m.group(1); } } filename = UUID.randomUUID()+ ".tmp";//默认取一个文件名 } return filename; } /** * 开始下载文件 * @param listener 监听下载数量的变化,如果不需要了解实时下载的数量,可以设置为null * @return 已下载文件大小 * @throws Exception */ public int download(DownloadProgressListener listener) throws Exception{ try { if(this.data.size() != this.threads.length){ this.data.clear(); for (int i = 0; i < this.threads.length; i++) { this.data.put(i+1, this.block * i); } } for (int i = 0; i < this.threads.length; i++) { int downLength = this.data.get(i+1) - (this.block * i); if(downLength < this.block && this.data.get(i+1)<this.fileSize){ //该线程未完成下载时,继续下载 RandomAccessFile randOut = new RandomAccessFile(this.saveFile, "rw"); if(this.fileSize>0) randOut.setLength(this.fileSize); randOut.seek(this.data.get(i+1)); this.threads[i] = new DownloadThread(this, this.url, randOut, this.block, this.data.get(i+1), i+1); this.threads[i].setPriority(7); this.threads[i].start(); }else{ this.threads[i] = null; } } this.fileService.save(this.downloadUrl, this.data); boolean notFinish = true;//下载未完成 while (notFinish) {// 循环判断是否下载完毕 Thread.sleep(900); notFinish = false;//假定下载完成 for (int i = 0; i < this.threads.length; i++){ if (this.threads[i] != null && !this.threads[i].isFinish()) { notFinish = true;//下载没有完成 if(this.threads[i].getDownLength() == -1){//如果下载失败,再重新下载 RandomAccessFile randOut = new RandomAccessFile(this.saveFile, "rw"); randOut.seek(this.data.get(i+1)); this.threads[i] = new DownloadThread(this, this.url, randOut, this.block, this.data.get(i+1), i+1); this.threads[i].setPriority(7); this.threads[i].start(); } } } if(listener!=null) listener.onDownloadSize(this.downloadSize); } fileService.delete(this.downloadUrl); } catch (Exception e) { print(e.toString()); throw new Exception("下载失败"); } return this.downloadSize; } /** * 获取Http响应头字段 * @param http * @return *
转自:http://www.cnblogs.com/guoshiandroid/archive/2010/06/05/1752150.html
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