Android文件上传

Android文件上传

Android实现文件的上传（并且带参数）可以使用HttpUrlConnection和HttpClient提供的一些接口，HttpClient使用比较简单一点，基本上已经封装好了可直接调用的方法，但是必须要增加几个需要的jar包。如果使用HttpUrlConnection稍微会复杂一点，以下分析第二种实现方法。         本方法对web服务端的实现没有任何限制，主要的原理是将文件和参数信息写到输出流中，以multipart/form-data的类型将参数和文件内容分成多个部分。首先，创建一个MultiUtility的类用来封装多个部分的数据（参数和文件）： MultiPartUtility.java package com.yanbao.test.utils; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.List; public class MultipartUtility { private final String boundary; private static final String LINE_FEED = "\r\n"; private HttpURLConnection httpConn; private String charset; private OutputStream outputStream; private PrintWriter writer; private static final int TIME_OUT = 10 * 1000; /** * 该构造方法初始化一个以multipart/form-data为content type的 HTTP POST 请求 * * @param requestURL   * 请求的URL * @param charset * 字符集 * @throws IOException   */ public MultipartUtility(String requestURL, String charset) throws IOException { this.charset = charset; // creates a unique boundary based on time stamp boundary = "===" + System.currentTimeMillis() + "==="; URL url = new URL(requestURL); = (HttpURLConnection) url.openConnection(); httpConn.setConnectTimeout(TIME_OUT); httpConn.setUseCaches(false); // indicates POST method httpConn.setDoInput(true); httpConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary); "CodeJava Agent"); "Bonjour"); outputStream = httpConn.getOutputStream(); writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), true); } /** * 为请求添加一个表单属性 *     * @param name * 属性名  * @param value * 属性值  * */ public void addFormField(String name, String value) { writer.append("--" + boundary).append(LINE_FEED); writer.append("Content-Disposition: form-data; name=\"" + name + "\"") .append(LINE_FEED); writer.append("Content-Type: text/plain; charset=" + charset).append( LINE_FEED); writer.append(LINE_FEED); writer.append(value).append(LINE_FEED); writer.flush(); } /** * 添加上传文件部分到请求中  * * @param fieldName * 中的属性名 * @param uploadFile * 待上传文件 * @throws IOException   */ public void addFilePart(String fieldName, File uploadFile) throws IOException { String fileName = uploadFile.getName(); writer.append("--" + boundary).append(LINE_FEED); writer.append( "Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + fileName + "\"") .append(LINE_FEED); writer.append( "Content-Type: " + URLConnection.guessContentTypeFromName(fileName)) .append(LINE_FEED); writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED); writer.append(LINE_FEED); writer.flush(); FileInputStream inputStream = new FileInputStream(uploadFile); byte[] buffer = new byte[4096]; int bytesRead = -1; while ((bytesRead = inputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, bytesRead); } outputStream.flush(); inputStream.close(); writer.append(LINE_FEED); writer.flush(); } /** * 向请求中添加一个头字段 * * @param name * 头字段的名字 * @param value * 头字段的值  */ public void addHeaderField(String name, String value) { writer.append(name + ": " + value).append(LINE_FEED); writer.flush(); } /** * 完成请求并且接收服务器响应信息 * * @return * 如果服务器返回状态为ok，将返回一个String的list * 否则抛出一个异常 * @throws IOException */ public List finish() throws IOException { List response = new ArrayList(); writer.append(LINE_FEED).flush(); writer.append("--" + boundary + "--").append(LINE_FEED); writer.close(); // checks server's status code first int status = httpConn.getResponseCode(); if (status == HttpURLConnection.HTTP_OK) { BufferedReader reader = new BufferedReader(new InputStreamReader( httpConn.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { response.add(line); } reader.close(); httpConn.disconnect(); } else { throw new IOException("Server returned non-OK status: " + status); } return response; } }下面是一个测试的类： UrlConnectionFileUploadTest.java package com.yanbao.test.utils; import java.io.File; import java.io.IOException; import java.util.List; public class UrlConnectionFileUploadTest { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub upload(); } private static void upload() { // 需要请求的URL String requestURL = "https://your.request.url"; String apiKey = "key123456"; String fileName = "D:/logs/data-valid-api.log"; String androidVersion = "4.1"; String deviceName = "xiaomi"; String sdkVersion = "2.1"; String charset = "UTF-8"; File uploadFile = new File(fileName); try { MultipartUtility multipart = new MultipartUtility(requestURL, charset); multipart.addHeaderField("User-Agent", "Mozilla/5.0"); multipart.addHeaderField("Test-Header", "Header-Value"); // 需要传的参数 multipart.addFormField("APIKey", apiKey); multipart.addFormField("android_version", androidVersion); multipart.addFormField("device_name", deviceName); multipart.addFormField("sdk_version", sdkVersion); // 需要传的文件 multipart.addFilePart("file", uploadFile); List response = multipart.finish(); System.out.println("SERVER REPLIED:"); for (String line : response) { System.out.println(line); } } catch (IOException ex) { System.err.println(ex); } } } 这样就可以实现带参数的post方式上传文件。

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。