Android 上传文件

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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urllog("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。

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