上传文件其实就通过文件中数据，通过tcp/ip协议，把内容传到服务器中。
可以单独的利用java中的socket或者是urlconnection进行io输入输出就可以了。
但是做过web的都知道，可以通过form表单进行上传文件。
<html> <body> <form action="upload_file.php" method="post" enctype="multipart/form-data"> <label for="file">Filename:</label> <input type="file" name="file" id="file" /> <br /> <input type="submit" name="submit" value="Submit" /> </form> </body> </html>
这样可以利用androidapi自带的httpclient进行模仿web中的form表单进行提交。
package com.example.testandroidupload;
import java.io.File;
import java.io.FileInputStream;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.InputStreamBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread() {
public void run() {
try {
doUPload();
} catch (Exception e) {
e.printStackTrace();
}
};
}.start();
}
public HttpClient createClient() {
HttpParams params = new BasicHttpParams();
params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
params.setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, HTTP.DEFAULT_CONTENT_CHARSET);
params.setBooleanParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, true);
params.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 30 * 1000);
params.setParameter(CoreConnectionPNames.SO_TIMEOUT, 30 * 1000);
SchemeRegistry schReg = new SchemeRegistry();
schReg.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
schReg.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
ClientConnectionManager conMgr = new ThreadSafeClientConnManager(params, schReg);
return new DefaultHttpClient(conMgr, params);
}
void doUPload() throws Exception {
// 需要上传的文件
File file = new File("/mnt/sdcard/test.png");
FileInputStream fis = new FileInputStream(file);
HttpClient httpclient = createClient();
String url = "";
MultipartEntity me = new MultipartEntity();
me.addPart("file", new InputStreamBody(fis, file.getName()));
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(me);
HttpResponse httpResponse = httpclient.execute(httpPost);
int code = httpResponse.getStatusLine().getStatusCode();
log("http status code:" + code);
if (code == HttpStatus.SC_OK) {
String result = EntityUtils.toString(httpResponse.getEntity(), HTTP.UTF_8);
// 上传的结果，可以使json，或者是返回上传后文件的的url
log("result = " + result);
log("上传成功");
}
}
static void log(String msg) {
Log.i("test", msg);
}
}上面的代码中需要MultipartEntity，这个是第三方jar文件（httpmime-4.1.1.jar），需要添加到libs文件夹中。