有关于android上传文件问题

O(∩_∩)O  要坚持把遇到的所有问题都总结到博客中

android上传关键是在于将所有的信息都通过form表单的形式传递，首先一定要确定同服务器端的传递接口参数（坑爹啊。。。不知道参数调试了半天），模拟http头信息，将所有的信息可以通过各种方式（HttpURLConnection, socket, ?httpclient?）传递到服务端， 这其中参数我忽略了数据长度的参数，结果下场很惨。。。。。。

话不多说 上代码~~~

public static String post(Task task, Map<String, File> files) throws IOException {final String BOUNDARY = "---------------------------"+ java.util.UUID.randomUUID().toString(); // 数据分隔线final String endline = "--" + BOUNDARY + "--\r\n";// 数据结束标志int fileDataLength = 0;for (Map.Entry<String, File> entry : files.entrySet()) {// 得到文件类型数据的总长度StringBuilder fileExplain = new StringBuilder();File file = entry.getValue();fileExplain.append("--");fileExplain.append(BOUNDARY);fileExplain.append("\r\n");fileExplain.append("Content-Disposition: form-data;name=\""+ entry.getKey() + "\";filename=\"" + file.getName()+ "\"\r\n");fileExplain.append("Content-Type: " + "application/octet-stream"+ "\r\n\r\n");fileExplain.append("\r\n");fileDataLength += fileExplain.length();if (file != null) {fileDataLength += file.length();}}StringBuilder textEntity = new StringBuilder();String data = getJson(getParams(task.params));textEntity.append("--");textEntity.append(BOUNDARY);textEntity.append("\r\n");textEntity.append("Content-Disposition: form-data; name=\"" + "data"+ "\"\r\n\r\n");textEntity.append(data);textEntity.append("\r\n");int dataLength = textEntity.toString().getBytes().length+ fileDataLength + endline.getBytes().length;if (task.url != null) {URL url = new URL(task.url);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); // 不允许使用缓存conn.setRequestMethod("POST");conn.setRequestProperty("connection", "keep-alive");conn.setRequestProperty("Charsert", "UTF-8");conn.setRequestProperty("Content-Type", "multipart/form-data"+ ";boundary=" + BOUNDARY);conn.setRequestProperty("Content-Length",String.valueOf(dataLength));DataOutputStream outputStream = new DataOutputStream(conn.getOutputStream());outputStream.writeBytes(textEntity.toString());for (Map.Entry<String, File> entry : files.entrySet()) {StringBuilder fileEntity = new StringBuilder();File file = entry.getValue();if (file != null) {fileEntity.append("--");fileEntity.append(BOUNDARY);fileEntity.append("\r\n");fileEntity.append("Content-Disposition: form-data;name=\""+ entry.getKey() + "\";filename=\""+ entry.getValue().getName() + "\"\r\n");fileEntity.append("Content-Type: "+ "application/octet-stream" + "\r\n\r\n");outputStream.writeBytes(fileEntity.toString());FileInputStream fis = new FileInputStream(file);byte[] buffer = new byte[1024];int len = 0;while ((len = fis.read(buffer)) != -1) {outputStream.write(buffer, 0, len);outputStream.flush();}outputStream.write("\r\n".getBytes());fis.close();}}outputStream.writeBytes(endline);BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));if (conn.getResponseCode() != 200) {// 读取web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败return "error";}String result = "";String line = null;while ((line = reader.readLine()) != null) {result = result + line;}outputStream.flush();outputStream.close();reader.close();return result;}else{return "error";}}

Task 中封装了 一些关于上传任务的信息，Map 参数 主要用于存放上传文件。