Welcome 微信登录

首页 / 移动开发 / Android / Android使用post方式上传图片到服务器的方法

本文实例讲述了Android使用post方式上传图片到服务器的方法。分享给大家供大家参考,具体如下:
/** * 上传文件到服务器类 ** @author tom */public class UploadUtil {private static final String TAG = "uploadFile";private static final int TIME_OUT = 10 * 1000; // 超时时间private static final String CHARSET = "utf-8"; // 设置编码/** * Android上传文件到服务端 ** @param file 需要上传的文件 * @param RequestURL 请求的rul * @return 返回响应的内容 */public static String uploadFile(File file, String RequestURL) {String result = null;String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成String PREFIX = "--", LINE_END = "
";String CONTENT_TYPE = "multipart/form-data"; // 内容类型try {URL url = new URL(RequestURL);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setReadTimeout(TIME_OUT);conn.setConnectTimeout(TIME_OUT);conn.setDoInput(true); // 允许输入流conn.setDoOutput(true); // 允许输出流conn.setUseCaches(false); // 不允许使用缓存conn.setRequestMethod("POST"); // 请求方式conn.setRequestProperty("Charset", CHARSET); // 设置编码conn.setRequestProperty("connection", "keep-alive");conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);if (file != null) {/** * 当文件不为空,把文件包装并且上传 */DataOutputStream dos = new DataOutputStream(conn.getOutputStream());StringBuffer sb = new StringBuffer();sb.append(PREFIX);sb.append(BOUNDARY);sb.append(LINE_END);/** * 这里重点注意: name里面的值为服务端需要key 只有这个key 才可以得到对应的文件 * filename是文件的名字,包含后缀名的 比如:abc.png */sb.append("Content-Disposition: form-data; name="uploadfile"; filename=""+ file.getName() + """ + LINE_END);sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END);sb.append(LINE_END);dos.write(sb.toString().getBytes());InputStream is = new FileInputStream(file);byte[] bytes = new byte[1024];int len = 0;while ((len = is.read(bytes)) != -1) {dos.write(bytes, 0, len);}is.close();dos.write(LINE_END.getBytes());byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();dos.write(end_data);dos.flush();/** * 获取响应码 200=成功 当响应成功,获取响应的流 */int res = conn.getResponseCode();Log.e(TAG, "response code:" + res);// if(res==200)// {Log.e(TAG, "request success");InputStream input = conn.getInputStream();StringBuffer sb1 = new StringBuffer();int ss;while ((ss = input.read()) != -1) {sb1.append((char) ss);}result = sb1.toString();Log.e(TAG, "result : " + result);// }// else{// Log.e(TAG, "request error");// }}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return result;}/** * 通过拼接的方式构造请求内容,实现参数传输以及文件传输 ** @param url Service net address * @param params text content * @param files pictures * @return String result of Service response * @throws IOException */public static String post(String url, Map<String, String> params, Map<String, File> files)throws IOException {String BOUNDARY = java.util.UUID.randomUUID().toString();String PREFIX = "--", LINEND = "
";String MULTIPART_FROM_DATA = "multipart/form-data";String CHARSET = "UTF-8";URL uri = new URL(url);HttpURLConnection conn = (HttpURLConnection) uri.openConnection();conn.setReadTimeout(10 * 1000); // 缓存的最长时间conn.setDoInput(true);// 允许输入conn.setDoOutput(true);// 允许输出conn.setUseCaches(false); // 不允许使用缓存conn.setRequestMethod("POST");conn.setRequestProperty("connection", "keep-alive");conn.setRequestProperty("Charsert", "UTF-8");conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);// 首先组拼文本类型的参数StringBuilder sb = new StringBuilder();for (Map.Entry<String, String> entry : params.entrySet()) {sb.append(PREFIX);sb.append(BOUNDARY);sb.append(LINEND);sb.append("Content-Disposition: form-data; name="" + entry.getKey() + """ + LINEND);sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);sb.append("Content-Transfer-Encoding: 8bit" + LINEND);sb.append(LINEND);sb.append(entry.getValue());sb.append(LINEND);}DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());outStream.write(sb.toString().getBytes());// 发送文件数据if (files != null)for (Map.Entry<String, File> file : files.entrySet()) {StringBuilder sb1 = new StringBuilder();sb1.append(PREFIX);sb1.append(BOUNDARY);sb1.append(LINEND);sb1.append("Content-Disposition: form-data; name="uploadfile"; filename=""+ file.getValue().getName() + """ + LINEND);sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);sb1.append(LINEND);outStream.write(sb1.toString().getBytes());InputStream is = new FileInputStream(file.getValue());byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) != -1) {outStream.write(buffer, 0, len);}is.close();outStream.write(LINEND.getBytes());}// 请求结束标志byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();outStream.write(end_data);outStream.flush();// 得到响应码int res = conn.getResponseCode();InputStream in = conn.getInputStream();StringBuilder sb2 = new StringBuilder();if (res == 200) {int ch;while ((ch = in.read()) != -1) {sb2.append((char) ch);}}outStream.close();conn.disconnect();return sb2.toString();}}
示例调用第二种方式上传:
final Map<String, String> params = new HashMap<String, String>();params.put("send_userId", String.valueOf(id));params.put("send_email", address);params.put("send_name", name);params.put("receive_email", emails);final Map<String, File> files = new HashMap<String, File>();files.put("uploadfile", file);final String request = UploadUtil.post(requestURL, params, files);
更多关于Android相关内容感兴趣的读者可查看本站专题:《Android调试技巧与常见问题解决方法汇总》、《Android开发入门与进阶教程》、《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。