易采站长站为您分析Android编程使用HTTP协议与TCP协议实现上传文件的方法,结合实例形式较为详细的分析了Android使用HTTP协议与TCP协议的具体步骤与实现文件传输的相关技巧,需要的朋友可以参考下
本文实例讲述了Android编程使用HTTP协议与TCP协议实现上传文件的方法。，具体如下：
Android上传文件有两种方式，第一种是基于Http协议的HttpURLConnection，第二种是基于TCP协议的Socket。 这两种方式的区别是使用HttpURLConnection上传时内部有缓存机制，如果上传较大文件会导致内存溢出。如果用TCP协议Socket方式上传就会解决这种弊端。
HTTP协议HttpURLConnection
1. 通过URL封装路径打开一个HttpURLConnection
2.设置请求方式以及头字段：Content-Type、Content-Length、Host
3.拼接数据发送
示例：
private static final String BOUNDARY = "---------------------------7db1c523809b2";//数据分割线
public boolean uploadHttpURLConnection(String username, String password, String path) throws Exception {
//找到sdcard上的文件
File file = new File(Environment.getExternalStorageDirectory(), path);
//仿Http协议发送数据方式进行拼接
StringBuilder sb = new StringBuilder();
sb.append("--" + BOUNDARY + "rn");
sb.append("Content-Disposition: form-data; name="username"" + "rn");
sb.append("rn");
sb.append(username + "rn");
sb.append("--" + BOUNDARY + "rn");
sb.append("Content-Disposition: form-data; name="password"" + "rn");
sb.append("rn");
sb.append(password + "rn");
sb.append("--" + BOUNDARY + "rn");
sb.append("Content-Disposition: form-data; name="file"; filename="" + path + """ + "rn");
sb.append("Content-Type: image/pjpeg" + "rn");
sb.append("rn");
byte[] before = sb.toString().getBytes("UTF-8");
byte[] after = ("rn--" + BOUNDARY + "--rn").getBytes("UTF-8");
URL url = new URL("http://www.easck.com/14_Web/servlet/LoginServlet");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
conn.setRequestProperty("Content-Length", String.valueOf(before.length + file.length() + after.length));
conn.setRequestProperty("HOST", "192.168.1.16:8080");
conn.setDoOutput(true);
OutputStream out = conn.getOutputStream();
InputStream in = new FileInputStream(file);
out.write(before);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) != -1)
out.write(buf, 0, len);
out.write(after);
in.close();
out.close();
return conn.getResponseCode() == 200;
}
