android上的i-jetty （2）用Servlet显示Android设备的app列表

环境 : android + i-jetty + servlet

MyServlet.java

  1  package com.synnex.servlet;
  2 
  3  import java.io.ByteArrayOutputStream;
  4  import java.io.IOException;
  5  import java.io.PrintWriter;
  6  import java.util.List;
  7 
  8  import javax.servlet.ServletConfig;
  9  import javax.servlet.ServletException;
 10  import javax.servlet.ServletOutputStream;
 11  import javax.servlet.http.HttpServlet;
 12  import javax.servlet.http.HttpServletRequest;
 13  import javax.servlet.http.HttpServletResponse;
 14 
 15  import android.content.Context;
 16  import android.content.Intent;
 17  import android.content.pm.ApplicationInfo;
 18  import android.content.pm.PackageInfo;
 19  import android.content.pm.PackageManager;
 20  import android.content.pm.PackageManager.NameNotFoundException;
 21  import android.content.pm.ResolveInfo;
 22  import android.graphics.Bitmap;
 23  import android.graphics.Canvas;
 24  import android.graphics.PixelFormat;
 25  import android.graphics.drawable.Drawable;
 26  import android.util.Log;
 27 
 28  public  class MyServlet  extends HttpServlet
 29 {
 30      private  static  final  long serialVersionUID = -4258280559794945071L;
 31      private  final String TAG = "MyServlet";
 32      private  final String METHOD = "method";
 33     
 34      private Context context;
 35     
 36      public  void init(ServletConfig config)  throws ServletException
 37     {
 38          super.init(config);
 39         context = (Context)config.getServletContext().getAttribute("org.mortbay.ijetty.context");
 40         Log.v(TAG, "## init android context success ##");
 41     }
 42     
 43      protected  void service(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException
 44     {
 45         String method = request.getParameter(METHOD);
 46          if("listApp".equals(method))
 47         {
 48             response.setContentType("text/html; charset=UTF-8");
 49             listApp(request, response);
 50         }
 51          else  if("appIcon".equals(method))
 52         {
 53             appIcon(request, response);
 54         }
 55          else
 56         {
 57             response.setContentType("text/html; charset=UTF-8");
 58             sayHello(request, response);
 59         }
 60     }
 61 
 62      private  void appIcon(HttpServletRequest request, HttpServletResponse response)  throws IOException
 63     {
 64         response.setContentType("image/JPEG");
 65         ServletOutputStream out = response.getOutputStream();
 66         PackageManager pm = context.getPackageManager();
 67          try
 68         {
 69             Drawable icon = pm.getApplicationIcon(request.getParameter("id"));
 70             ByteArrayOutputStream baos =  new ByteArrayOutputStream();
 71             drawableToBitmap(icon).compress(Bitmap.CompressFormat.PNG, 100, baos);
 72              byte[] b = baos.toByteArray();
 73             out.write(b);
 74             out.flush();
 75         }
 76          catch (NameNotFoundException e)
 77         {
 78             Log.e(TAG, "get app icon error : ", e);
 79             out.write("error".getBytes("UTF-8"));
 80         }
 81         response.flushBuffer();
 82     }
 83 
 84      private  void sayHello(HttpServletRequest request, HttpServletResponse response)  throws IOException
 85     {
 86         PrintWriter writer = response.getWriter();
 87         writer.write("Hello World!!!");
 88         writer.flush();
 89         response.flushBuffer();
 90     }
 91 
 92      private  void listApp(HttpServletRequest request, HttpServletResponse response)  throws IOException
 93     {
 94         Intent mainIntent =  new Intent(Intent.ACTION_MAIN,  null);
 95         mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
 96         List<ResolveInfo> apps = context.getPackageManager().queryIntentActivities(mainIntent, 0);
 97         PackageManager pm = context.getPackageManager();
 98         
 99         StringBuilder buf =  new StringBuilder(500);
100         buf.append("<table>")
101                 .append("<tr>")
102                     .append("<th>App Name</th>")
103                     .append("<th>App Version</th>")
104                     .append("<th>Package Name</th>")
105                     .append("<th>App Icon</th>")
106                 .append("</tr>");
107         String imgBaseUrl = request.getContextPath() + request.getServletPath() + "?" + METHOD + "=appIcon";
108         Log.v(TAG, imgBaseUrl);
109          for(ResolveInfo info : apps)
110         {
111              try
112             {
113                 PackageInfo appInfo = pm.getPackageInfo(info.activityInfo.packageName, 0);
114                  if((appInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) <= 0)
115                 {
116                     buf.append("<tr>")
117                         .append("<td>").append(appInfo.applicationInfo.loadLabel(pm)).append("</td>")
118                         .append("<td>").append(appInfo.versionName).append("</td>")
119                         .append("<td>").append(appInfo.packageName).append("</td>")
120                         .append("<td><img width='50px' height='50px' src='").append(imgBaseUrl).append("&id=").append(appInfo.packageName).append("'/></td>")
121                         .append("<td></td>")
122                         .append("</tr>");
123                 }
124             }
125              catch (NameNotFoundException e)
126             {
127                 Log.e(TAG, "get app info error: ", e);
128                  continue;
129             }
130         }
131         
132         buf.append("</table>");
133         
134         PrintWriter writer = response.getWriter();
135         writer.write(buf.toString());
136         writer.flush();
137         response.flushBuffer();
138     }
139 
140      private  static Bitmap drawableToBitmap(Drawable drawable)
141     {
142          int w = drawable.getIntrinsicWidth();
143          int h = drawable.getIntrinsicHeight();
144 
145         Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
146         Bitmap bitmap = Bitmap.createBitmap(w, h, config);
147         Canvas canvas =  new Canvas(bitmap);
148         drawable.setBounds(0, 0, w, h);
149         drawable.draw(canvas);
150          return bitmap;
151     }
152 }

在浏览器中输入：http://{android_ip}:8080/MyServlet?method=listApp

显示结果：