android通過servlet上傳文件到服務器

更新時間：2020年06月16日 15:59:41 作者：二十六畫生的博客

這篇文章主要為大家詳細介紹了android通過servlet上傳文件到服務器，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了android通過servlet上傳文件到服務器的具體代碼，供大家參考，具體內容如下

服務器端：部署在Tomcat上，直接在myEclipse上開發(fā)即可

package com;
 
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
 
import javax.servlet.ServletException;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
public class upload extends HttpServlet {
 
 
 private String transerFileName ;
 
 /**
 * Constructor of the object.
 */
 public upload() {
 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();
 }
 
 /**
 * 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");
 
 // /response.setHeader("Content-Type",
 // "application/x-www-form-urlencoded; charset=GBK");
 
 PrintWriter out = response.getWriter();
 request.setCharacterEncoding("utf-8");////這句至關重要，不然中文的文件名稱顯示亂碼
 // 創(chuàng)建文件項目工廠對象
 DiskFileItemFactory factory = new DiskFileItemFactory();
 
 // 設置文件上傳路徑
 //String upload = this.getServletContext().getRealPath("/upload/");
 
 String upload="F:\\upload";
 // 獲取系統(tǒng)默認的臨時文件保存路徑，該路徑為Tomcat根目錄下的temp文件夾
 // String temp = System.getProperty("java.io.tmpdir");
 
 // 設置緩沖區(qū)大小為 500M
 factory.setSizeThreshold(1024 * 1024 * 500);// //緩沖區(qū)設置太大會上傳失敗
 // 設置臨時文件夾為temp
 // factory.setRepository(new File(temp));
 factory.setRepository(new File(upload));
 // 用工廠實例化上傳組件,ServletFileUpload 用來解析文件上傳請求
 ServletFileUpload servletFileUpload = new ServletFileUpload(factory);
 
 // 解析結果放在List中
 
 List<FileItem> list;
 try {
 list = servletFileUpload.parseRequest(request);
 
 for (FileItem item : list) {
 String name = item.getFieldName();
 InputStream is = item.getInputStream();
 
 if (name.contains("file")) {
  try {
  InputStream input = item.getInputStream();
 
  String itemName = item.getName();
  String fileName = itemName.substring(
  itemName.lastIndexOf("\\") + 1,
  itemName.length());
 
  FileOutputStream output = new FileOutputStream(
  new File(
   "F:\\upload\\"
   + fileName));
  byte[] buf = new byte[102400];
  int length = 0;
  while ((length = input.read(buf)) != -1) {
  output.write(buf, 0, length);
  }
  input.close();
  output.close();
  } catch (Exception e) {
  e.printStackTrace();
  }
  out.write("success");
  out.flush();
  out.close();
 
 }// / if (name.contains("file"))
 }// /for
 } catch (FileUploadException e1) {
 // TODO Auto-generated catch block
 e1.printStackTrace();
 }
 }
 
 /**
 * Initialization of the servlet. <br>
 * 
 * @throws ServletException
 *    if an error occurs
 */
 public void init() throws ServletException {
 // Put your code here
 }
 
}

手機端：

package com.example;
 
import java.io.File;
import java.io.FileNotFoundException;
import java.io.UnsupportedEncodingException;
 
import org.apache.http.client.methods.HttpPost;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
 
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
 
public class MainActivity extends Activity {
 private TextView uploadInfo;
 private Button button1;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 uploadInfo = (TextView) findViewById(R.id.upload_info);
 button1 = (Button) findViewById(R.id.button1);
 
 button1.setOnClickListener(new OnClickListener() {
 
 @Override
 public void onClick(View v) {
 // TODO 自動生成的方法存根
 uploadFile();
 }
 });
 
 }// /onCreate
 
 private void uploadFile() {
 
 // new Thread(new Runnable() {////不能使用線程
 //
 // @Override
 // public void run() {
 // TODO 自動生成的方法存根
 // 服務器端地址
 String url = "http://192.168.0.105:8080/upload/servlet/upload";
 
 // 手機端要上傳的文件，首先要保存你手機上存在該文件
 // String filePath = Environment.getExternalStorageDirectory() +
 // "/1delete/1.jpg";
 // String filePath ="/sdcard/1delete/1.jpg"; ///可以
 // String filePath ="/sdcard/11/軟工大作業(yè).ppt";///可以
 // String filePath ="/sdcard/音樂/許嵩-千古.mp3";////別忘了/sdcard開頭，，可以
 // /String filePath ="/sdcard/相機/22222.mp4"; ///30M 不可以
 String filePath = "/sdcard/音樂/愛的勇氣.mp3";
 Log.i("filePath", filePath);
 
 AsyncHttpClient httpClient = new AsyncHttpClient();
 httpClient.setTimeout(60 * 60 * 1000);
 RequestParams param = new RequestParams();
 try {
 param.put("file", new File(filePath));
 httpClient.post(url, param, new AsyncHttpResponseHandler() {
 @Override
 public void onStart() {
  super.onStart();
  uploadInfo.setText("正在上傳...");
 }
 
 @Override
 public void onSuccess(String arg0) {
  super.onSuccess(arg0);
  Log.i("ck", "success>" + arg0);
  if (arg0.equals("success")) {
  Toast.makeText(MainActivity.this, "上傳成功！", 1000).show();
  }
  uploadInfo.setText(arg0);
 }
 
 @Override
 public void onFailure(Throwable arg0, String arg1) {
  super.onFailure(arg0, arg1);
  uploadInfo.setText("上傳失敗！");
 }
 });
 } catch (FileNotFoundException e) {
 e.printStackTrace();
 Toast.makeText(MainActivity.this, "上傳文件不存在！", 1000).show();
 }
 // }
 // }).start();
 
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example"
 android:versionCode="1"
 android:versionName="1.0" >
 
 <uses-sdk
  android:minSdkVersion="8"
  android:targetSdkVersion="17" />
 
  <!-- 使用網絡功能所需權限 -->
 <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>