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android通過servlet服務(wù)器保存文件到手機(jī)

更新時(shí)間：2020年06月16日 17:04:59 作者：二十六畫生的博客

這篇文章主要為大家詳細(xì)介紹了android通過servlet服務(wù)器保存文件到手機(jī)，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了android通過servlet服務(wù)器保存文件到手機(jī)的具體代碼，供大家參考，具體內(nèi)容如下

服務(wù)器端：（手機(jī)和電腦連接的同一個(gè)WIFI）

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(guān)重要，不然中文的文件名稱顯示亂碼
 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());///輸出文件的字符串
 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() 
 {//將圖片文件轉(zhuǎn)化為字節(jié)數(shù)組字符串，并對(duì)其進(jìn)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(yè).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; 
 //讀取圖片字節(jié)數(shù)組 
 try 
 { 
 in = new FileInputStream(imgFile); 
 data = new byte[in.available()]; 
 in.read(data); 
 in.close(); 
 } 
 catch (IOException e) 
 { 
 e.printStackTrace(); 
 } 
 //對(duì)字節(jié)數(shù)組Base64編碼 
 BASE64Encoder encoder = new BASE64Encoder(); 
 return encoder.encode(data);//返回Base64編碼過的字節(jié)數(shù)組字符串 
 } ///GetImageStr 
}

手機(jī)端：

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(shè)置請(qǐng)求超時(shí)10秒鐘
 private static final int SO_TIMEOUT = 10*60 * 1000; // 設(shè)置請(qǐng)求超時(shí)時(shí)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(dòng)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(dòng)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(zhí)行請(qǐng)求返回相應(yīng)
 HttpResponse response = client.execute(request);
 // 判斷是否請(qǐng)求成功
 if (response.getStatusLine().getStatusCode() == 200) {
 // 獲得響應(yīng)信息
 String responseMessage = EntityUtils.toString(response
 .getEntity());
 Log.i("responseMessage", responseMessage + ",長(zhǎng)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字符串轉(zhuǎn)化成圖片 
 public static boolean GenerateImage(String imgStr) 
 { //對(duì)字節(jié)數(shù)組字符串進(jìn)行Base64解碼并生成圖片 
 if (imgStr == null) //圖像數(shù)據(jù)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(diào)整異常數(shù)據(jù) 
 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(yè)_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(yè)_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，并設(shè)置超時(shí)
 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(wǎng)絡(luò)功能所需權(quán)限 -->
 <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功能需要讀寫外部存儲(chǔ)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>