android通過servlet伺服器儲存檔案到手機
阿新 • • 發佈：2019-01-07
伺服器端：（手機和電腦連線的同一個WIFI）
手機端：package com; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import sun.misc.BASE64Encoder; public class download extends HttpServlet { /** * Constructor of the object. */ public download() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // response.setContentType("text/html"); // PrintWriter out = response.getWriter(); // out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); // out.println("<HTML>"); // out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); // out.println(" <BODY>"); // out.print(" This is "); // out.print(this.getClass()); // out.println(", using the GET method"); // out.println(" </BODY>"); // out.println("</HTML>"); // out.flush(); // out.close(); doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); //request.setCharacterEncoding("utf-8");////這句至關重要，不然中文的檔名稱顯示亂碼 PrintWriter out = response.getWriter(); // out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); // out.println("<HTML>"); // out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); // out.println(" <BODY>"); // out.print(" This is "); // out.print(this.getClass()); // out.println(", using the POST method"); // out.println(" </BODY>"); // out.println("</HTML>"); out.print(GetImageStr());///輸出檔案的字串 out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } public static String GetImageStr() {//將圖片檔案轉化為位元組陣列字串，並對其進行Base64編碼處理 // String imgFile = "d://test.jpg";//待處理的圖片 //String imgFile="F://upload//1.jpg";////可以 // String imgFile="F://upload//軟工大作業.ppt";////可以 String imgFile="F://upload//愛的勇氣.mp3";//不可以 // String imgFile="F://upload//upload.rar";//可以 InputStream in = null; byte[] data = null; //讀取圖片位元組陣列 try { in = new FileInputStream(imgFile); data = new byte[in.available()]; in.read(data); in.close(); } catch (IOException e) { e.printStackTrace(); } //對位元組陣列Base64編碼 BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(data);//返回Base64編碼過的位元組陣列字串 } ///GetImageStr }
package com.example.getfile_2; import java.io.FileOutputStream; import java.io.OutputStream; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.util.EntityUtils; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { private static final int REQUEST_TIMEOUT = 5 * 1000;// 設定請求超時10秒鐘 private static final int SO_TIMEOUT = 10*60 * 1000; // 設定請求超時時間10秒鐘 private static final int LOGIN_OK = 1; private Button button1, button2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button1 = (Button) findViewById(R.id.button1); button2 = (Button) findViewById(R.id.button2); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO 自動生成的方法存根 Log.i("button1", "button1"); fun_HttpPost(); } }); } public void fun_HttpPost() { new Thread(new Runnable() { @Override public void run() { // TODO 自動生成的方法存根 String urlStr = "http://192.168.0.102:8080/download/servlet/download"; HttpPost request = new HttpPost(urlStr); try { HttpClient client = getHttpClient(); // 執行請求返回相應 HttpResponse response = client.execute(request); // 判斷是否請求成功 if (response.getStatusLine().getStatusCode() == 200) { // 獲得響應資訊 String responseMessage = EntityUtils.toString(response .getEntity()); Log.i("responseMessage", responseMessage + ",長度：" + responseMessage.length()); GenerateImage(responseMessage); Log.i("生成成功", "生成成功"); } } catch (Exception e) { e.printStackTrace(); } }// //run() }).start(); }// /fun_register() //base64字串轉化成圖片 public static boolean GenerateImage(String imgStr) { //對位元組陣列字串進行Base64解碼並生成圖片 if (imgStr == null) //影象資料為空 return false; Decoder.BASE64Decoder decoder = new Decoder.BASE64Decoder(); try { //Base64解碼 byte[] b = decoder.decodeBuffer(imgStr); for(int i=0;i<b.length;++i) { if(b[i]<0) {//調整異常資料 b[i]+=256; } } //生成jpeg圖片 // String imgFilePath = "d://222.jpg";//新生成的圖片 // String imgFilePath = "F://upload//1_2.jpg";///可以 //String imgFilePath = "F://upload//軟工大作業_2.ppt";//可以 // String imgFilePath="F://upload//upload_2.rar"; // String imgFilePath="/sdcard/1spray/1_2.jpg";//可以 // String imgFilePath = "/sdcard/1spray/軟工大作業_2.ppt";//可以 String imgFilePath ="/sdcard/1spray/愛的勇氣_2.mp3";//9M不行了？？？？？ OutputStream out = new FileOutputStream(imgFilePath); out.write(b); out.flush(); out.close(); return true; } catch (Exception e) { return false; } } // 初始化HttpClient，並設定超時 public HttpClient getHttpClient() { BasicHttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT); HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT); HttpClient client = new DefaultHttpClient(httpParams); return client; }// /public HttpClient getHttpClient() }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="${relativePackage}.${activityClass}" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView1" android:layout_marginLeft="25dp" android:layout_marginTop="142dp" android:layout_toRightOf="@+id/textView1" android:text="ButtonPost" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/button1" android:layout_below="@+id/button1" android:layout_marginTop="34dp" android:text="ButtonGet" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.getfile_2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="16" />
<!-- 使用網路功能所需許可權 -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<!-- SDK離線地圖和cache功能需要讀寫外部儲存器 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
