标签:des http io os 使用 ar java for 文件
问题描述<form action="/upload/" enctype="multipart/form-data" method="post"> <input name="file" type="file"> <input type="submit" value="Submit"> <input type="text" name="username" value="t1@q.cn"> </form>
/** * @Description: TODO(带参,文件上传) * @param actionUrl * @param params * @param files * @return result * @throws IOException */ public static String post(String actionUrl, Map<String, String> params, Map<String, File> files) throws IOException { String BOUNDARY = java.util.UUID.randomUUID().toString(); String PREFIX = "--", LINEND = "\r\n"; String MULTIPART_FROM_DATA = "multipart/form-data"; String CHARSET = "UTF-8"; URL uri = new URL(actionUrl); HttpURLConnection conn = (HttpURLConnection) uri.openConnection(); conn.setReadTimeout(5 * 1000); conn.setDoInput(true);// 允许输入 conn.setDoOutput(true);// 允许输出 conn.setUseCaches(false); conn.setRequestMethod("POST"); // Post方式 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=\"file\"; filename=\"" + file.getKey() + "\"" + 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()); Log.i("文件大小", file.getValue().length() + ""); 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(); Log.i("图片上传结果", res + ""); InputStream in = conn.getInputStream(); InputStreamReader isReader = new InputStreamReader(in); BufferedReader bufReader = new BufferedReader(isReader); String line = null; String data = "OK"; while ((line = bufReader.readLine()) == null) data += line; if (res == 200) { int ch; StringBuilder sb2 = new StringBuilder(); while ((ch = in.read()) != -1) { sb2.append((char) ch); } } outStream.close(); conn.disconnect(); return in.toString(); }
http post请求错误 fileNotfoundexception 404
标签:des http io os 使用 ar java for 文件
原文地址:http://www.cnblogs.com/lengyanyue39/p/4027471.html