一个简单的安卓+Servlet图片上传例子

来源：互联网发布：贸仲委待遇怎么样知乎编辑：程序博客网时间：2024/05/23 17:37

例子比较简单，服务端为Java Web Servlet，doPost方法中接收图片并保存，然后将保存的图片名返回给客户端，关键代码：

@SuppressWarnings("deprecation")public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");  //设置编码          //获得磁盘文件条目工厂          DiskFileItemFactory factory = new DiskFileItemFactory();          //获取文件需要上传到的路径          String path = request.getRealPath("/upload");          File file=new File(path);        if(!file.exists()){        file.mkdirs();        }        factory.setRepository(new File(path));          //设置 缓存的大小        factory.setSizeThreshold(1024*1024) ;          //文件上传处理          ServletFileUpload upload = new ServletFileUpload(factory);          try {              //可以上传多个文件              List<FileItem> list = (List<FileItem>)upload.parseRequest(request);              for(FileItem item : list){                  //获取属性名字                  String name = item.getFieldName();                  //如果获取的 表单信息是普通的 文本 信息                  if(item.isFormField()){                                         //获取用户具体输入的字符串,因为表单提交过来的是 字符串类型的                      String value = item.getString() ;                      request.setAttribute(name, value);                  }else{                      //获取路径名                      String value = item.getName() ;                      //索引到最后一个反斜杠                      int start = value.lastIndexOf("\\");                      //截取 上传文件的 字符串名字，加1是 去掉反斜杠，                      String filename = value.substring(start+1);                      request.setAttribute(name, filename);                      //写到磁盘上                      item.write( new File(path,filename) );//第三方提供的                      System.out.println("上传成功："+filename);                    response.getWriter().print(filename);//将路径返回给客户端                }              }                        } catch (Exception e) {          System.out.println("上传失败");        response.getWriter().print("上传失败："+e.getMessage());        }  }

该方法同样适用于web端即网页图片上传，不是本文重点，不在讲解。

客户端关键代码：

/** * 文件上传 *  * @param urlStr 接口路径 * @param filePath 本地图片路径 * @return */public static String formUpload(String urlStr, String filePath) {String rsp = "";HttpURLConnection conn = null;String BOUNDARY = "|"; // request头和上传文件内容分隔符try {URL url = new URL(urlStr);conn = (HttpURLConnection) url.openConnection();conn.setConnectTimeout(5000);conn.setReadTimeout(30000);conn.setDoOutput(true);conn.setDoInput(true);conn.setUseCaches(false);conn.setRequestMethod("POST");conn.setRequestProperty("Connection", "Keep-Alive");conn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");conn.setRequestProperty("Content-Type","multipart/form-data; boundary=" + BOUNDARY);OutputStream out = new DataOutputStream(conn.getOutputStream());File file = new File(filePath);String filename = file.getName();String contentType = "";if (filename.endsWith(".png")) {contentType = "image/png";}if (filename.endsWith(".jpg")) {contentType = "image/jpg";}if (filename.endsWith(".gif")) {contentType = "image/gif";}if (filename.endsWith(".bmp")) {contentType = "image/bmp";}if (contentType == null || contentType.equals("")) {contentType = "application/octet-stream";}StringBuffer strBuf = new StringBuffer();strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");strBuf.append("Content-Disposition: form-data; name=\"" + filePath+ "\"; filename=\"" + filename + "\"\r\n");strBuf.append("Content-Type:" + contentType + "\r\n\r\n");out.write(strBuf.toString().getBytes());DataInputStream in = new DataInputStream(new FileInputStream(file));int bytes = 0;byte[] bufferOut = new byte[1024];while ((bytes = in.read(bufferOut)) != -1) {out.write(bufferOut, 0, bytes);}in.close();byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();out.write(endData);out.flush();out.close();// 读取返回数据StringBuffer buffer = new StringBuffer();BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));String line = null;while ((line = reader.readLine()) != null) {buffer.append(line).append("\n");}rsp = buffer.toString();reader.close();reader = null;} catch (Exception e) {e.printStackTrace();} finally {if (conn != null) {conn.disconnect();conn = null;}}return rsp;}

服务端图例：

客户端图例：

注意：测试的时候，请在客户端书写完整的本机局域网IP地址：

/** * 图片上传路径 */public static final String UPLOAD_URL="http://192.168.1.188:8080/uploadImage/UploadServlet";/** * 图片下载路径 */public static final String DOWNLOAD_URL="http://192.168.1.188:8080/uploadImage/upload/";

源码地址：http://download.csdn.net/detail/baiyuliang2013/8714775

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