First creation

SAS:APS Server/Download.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintWriter;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ *
+ * @author Deben
+ */
+@WebServlet(urlPatterns = {"/Download"})
+public class Download extends HttpServlet {
+
+    /**
+     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
+     * methods.
+     *
+     * @param request servlet request
+     * @param response servlet response
+     * @throws ServletException if a servlet-specific error occurs
+     * @throws IOException if an I/O error occurs
+     */
+    
+
+    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
+    /**
+     * Handles the HTTP <code>GET</code> method.
+     *
+     * @param request servlet request
+     * @param response servlet response
+     * @throws ServletException if a servlet-specific error occurs
+     * @throws IOException if an I/O error occurs
+     */
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        String device = request.getParameter("device");
+        String relativePath;
+        switch(device) {
+            case "android":
+                relativePath = getServletContext().getRealPath("/WEB-INF/android/Access control.apk");
+                break;
+            case "ios":
+                relativePath = getServletContext().getRealPath("/WEB-INF/");
+                break;
+            default:
+                
+                return;
+        }
+        // reads input file from an absolute path
+        
+        File downloadFile = new File(relativePath);
+        FileInputStream inStream = new FileInputStream(downloadFile);
+         
+        // if you want to use a relative path to context root:
+        
+        System.out.println("relativePath = " + relativePath);
+         
+        // obtains ServletContext
+        ServletContext context = getServletContext();
+         
+        // gets MIME type of the file
+        String mimeType = context.getMimeType(relativePath);
+        if (mimeType == null) {        
+            // set to binary type if MIME mapping not found
+            mimeType = "application/octet-stream";
+        }
+        System.out.println("MIME type: " + mimeType);
+         
+        // modifies response
+        response.setContentType(mimeType);
+        response.setContentLength((int) downloadFile.length());
+         
+        // forces download
+        String headerKey = "Content-Disposition";
+        String headerValue = String.format("attachment; filename=\"%s\"", downloadFile.getName());
+        response.setHeader(headerKey, headerValue);
+         
+        // obtains response's output stream
+        OutputStream outStream = response.getOutputStream();
+         
+        byte[] buffer = new byte[4096];
+        int bytesRead = -1;
+         
+        while ((bytesRead = inStream.read(buffer)) != -1) {
+            outStream.write(buffer, 0, bytesRead);
+        }
+         
+        inStream.close();
+        outStream.close();  
+    }
+
+    /**
+     * Handles the HTTP <code>POST</code> method.
+     *
+     * @param request servlet request
+     * @param response servlet response
+     * @throws ServletException if a servlet-specific error occurs
+     * @throws IOException if an I/O error occurs
+     */
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+    }
+
+}