Android http File Upload-local + server one-stop Analysis

Android http File Upload-local + server one-stop Analysis

Local:

Let's take a look at the project structure.

MainActivity. java

Package com. huxq. uploadexample; import java. io. file; import android. annotation. suppressLint; import android. app. activity; import android. app. progressDialog; import android. OS. bundle; import android. OS. environment; import android. OS. handler; import android. OS. message; import android. util. log; import android. view. view; import android. widget. toast; public class MainActivity extends Activity implements OnUploadLis Tener {// server path, replace with your own private String urlString = "http: // 192.168.1.2: 8080/UploadTest/Upload "; /*** Upload File Path */String filePath;/*** Upload File name */String fileName; ProgressDialog dialog;/*** when reading the file stream, the same progress is called back multiple times. With this flag, the ui is updated only when the progress is updated. */int oldProcess; @ SuppressLint ("HandlerLeak ") private Handler handler = new Handler () {public void handleMessage (android. OS. message msg) {Log. I ("process", "process" + m Sg. arg1); dialog. setProgress (msg. arg1); // display dialogif (! Dialog. isShowing () {Log. I ("process", "show"); dialog. show ();} else {if (msg. arg1 = 100) {// prompts the user to upload the dialog. dismiss (); toast ("Upload complete! ") ;}};}; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); initProgressDialog ();} public void upLoad (View v) {if (Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED) {// toast ("Upload"); String sdcardPath = Environment. getExternalStorageDirectory (). getAbsolutePath (); filePath = sdcardPath + "/K /"; File file = new File (filePath); // here I select the fifth File in the SORT K folder. You must upload the file based on your actual situation. Otherwise, an error will occur. FileName = file. list () [4]; filePath + = fileName; Log. I ("file. size "," size = "+ file. list (). length + "filePath" + filePath);} else {toast ("no memory card"); return;} new Thread () {public void run () {try {String response = HttpUtil. sendFile (urlString, filePath, fileName, MainActivity. this); Log. I ("response", "response" + response);} catch (Exception e) {e. printStackTrace ();}};}. start () ;}@ Overridepublic void onUpload (double process) {process = process * 100; int currentProcess = (int) process; dialog. setProgress (currentProcess); // avoid sending messages repeatedly. You can remove if to see what will happen if (currentProcess> oldProcess) {Message msg = handler. obtainMessage (); msg. arg1 = (int) process; handler. sendMessage (msg);} oldProcess = currentProcess;} public void initProgressDialog () {dialog = new ProgressDialog (this); dialog. setMax (100); dialog. setProgress (0); dialog. setProgressStyle (ProgressDialog. STYLE_HORIZONTAL); dialog. setCancelable (false); dialog. setCanceledOnTouchOutside (false); dialog. setTitle ("Uploading... ");} public void toast (String text) {Toast. makeText (getApplicationContext (), text, Toast. LENGTH_SHORT ). show ();}}

HttpUtil. java

Public static String sendFile (String urlPath, String filePath, String newName, OnUploadListener listener) throws Exception {String end = "\ r \ n"; String twoHyphens = "--"; string boundary = "*******"; URL url = new URL (urlPath); HttpURLConnection con = (HttpURLConnection) url. openConnection (); // set the parameter value of the setDoInput method to truecon for downloading. setDoInput (true); // set the parameter value of the setDoOutput method to truecon for upload. setDoOutput (true); // disable HttpURLCo Nnection uses cache con. setUseCaches (false); // the POST request must be capitalized con. setRequestMethod ("POST"); // set http request header information con. setRequestProperty ("Connection", "Keep-Alive"); con. setRequestProperty ("Charset", "UTF-8"); // when simulating a web page to upload a file to the server, each file must start with a separator, // The delimiter must be specified in the http request header. Boundary is any string, which is generally *** con. setRequestProperty ("Content-Type", "multipart/form-data; boundary =" + boundary); DataOutputStream ds = new DataOutputStream (con. getOutputStream (); ds. writeBytes (twoHyphens + boundary + end); // Upload File Information, including the request parameter name, upload file name, and file type, but not limited to this ds. writeBytes ("Content-Disposition: form-data;" + "name = \" file1 \ "; filename = \" "+ newName +" \ "" + end); ds. writeBytes (end); // get the input stream of the file and transfer the file through the stream. Here I overwrite FileInputStream. To listen to the upload progress, CustomFileInputStream fStream = new CustomFileInputStream (filePath); fStream. setOnUploadListener (listener);/* Set 1024 bytes */int bufferSize = 1024; byte [] buffer = new byte [bufferSize]; int length =-1; // read data from the file to the buffer while (length = fStream. read (buffer ))! =-1) {// write data to ds in DataOutputStream. write (buffer, 0, length);} ds. writeBytes (end); ds. writeBytes (twoHyphens + boundary + twoHyphens + end); fStream. close (); ds. flush (); // obtain the server feedback after the upload is complete. InputStream is = con. getInputStream (); int ch; StringBuffer B = new StringBuffer (); while (ch = is. read ())! =-1) {B. append (char) ch);} ds. close (); return B. toString ();}

CustomFileInputStream. java

Package com. huxq. uploadexample; import java. io. file; import java. io. fileDescriptor; import java. io. fileInputStream; import java. io. fileNotFoundException; import java. io. IOException; public class CustomFileInputStream extends FileInputStream {private OnUploadListener listener; private int total, done; private double process; public CustomFileInputStream (File file) throws FileNotFoundException {super (file); av Ailable ();} public CustomFileInputStream (FileDescriptor fd) {super (fd); available ();} public CustomFileInputStream (String path) throws FileNotFoundException {super (path ); available () ;}@ Overridepublic int read (byte [] buffer, int byteOffset, int byteCount) throws IOException {done + = byteCount; process = 1.0 * done/total; if (listener! = Null) {listener. onUpload (process);} return super. read (buffer, byteOffset, byteCount);} public void setOnUploadListener (OnUploadListener listener) {this. listener = listener;} @ Overridepublic int available () {try {// get the total size of the file total = super. available ();} catch (IOException e) {e. printStackTrace ();} return total ;}}

OnUploadListener. java

package com.huxq.uploadexample;public interface OnUploadListener {void onUpload(double process);}

Server:

The server receives the file stream through a servlet and writes it to the disk.

Upload. java <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHByZSBjbGFzcz0 = "brush: java;"> package com. huxq. test; import java. io. file; import java. io. fileOutputStream; import java. io. IOException; import java. util. iterator; import java. util. list; import javax. servlet. servletException; import javax. servlet. annotation. webServlet; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import Org. apache. commons. fileupload. fileItem; import org. apache. commons. fileupload. fileItemFactory; import org. apache. commons. fileupload. fileUploadException; import org. apache. commons. fileupload. disk. diskFileItemFactory; import org. apache. commons. fileupload. servlet. servletFileUpload;/*** Servlet implementation class Upload */@ WebServlet ("/Upload") public class Upload extends HttpServlet {private static fina L long serialVersionUID = 1L;/*** file storage path */private final String savaPath = "E: \ uploads/";/*** Default constructor. */public Upload () {}/*** @ see HttpServlet # doGet (HttpServletRequest request, response * response) */protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {boolean isMultipart = ServletFileUpload. isMultipartConten T (request); if (isMultipart) {FileItemFactory factory = new DiskFileItemFactory (); ServletFileUpload upload = new ServletFileUpload (factory); List items; try {items = upload. parseRequest (request); Iterator iter = items. iterator (); // you can receive multiple files while (iter. hasNext () {FileItem item = (FileItem) iter. next (); if (item. isFormField () {// common text processing String paramName = item. getFieldName (); String paramValue = item. g EtString (); System. out. println (paramName + ":" + paramValue);} else {// process uploaded file information String fileName = item. getName (); byte [] data = item. get (); String filePath = savaPath + fileName; File file = new File (savaPath); if (! File. exists () {file. mkdirs ();} System. out. println ("filePath:" + filePath); File file2 = new File (filePath); if (file2.exists () file2.delete (); FileOutputStream fos = new FileOutputStream (file2); fos. write (data); fos. close () ;}} response. getWriter (). write ("UPLOAD_SUCCESS");} catch (FileUploadException e) {e. printStackTrace (); response. getWriter (). write ("UPLOAD_FAILED") ;}}/ *** @ see HttpServlet # doPost (HttpServletRequest request, HttpServletResponse * response) */protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet (request, response );}}

Here we need two jar packages: commons-fileupload-1.3.1.jar and commons-io-2.4.jar.

All the things you want to talk about are in the Code. If you have any questions, you can download the Demo or leave a message.