android通过servlet服务器保存文件到手机
本文实例为大家分享了android通过servlet服务器保存文件到手机的具体代码，供大家参考，具体内容如下
服务器端：（手机和电脑连接的同一个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');////这句至关重要，不然中文的文件名称显示乱码 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());///输出文件的字符串 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() {//将图片文件转化为字节数组字符串，并对其进行Base64编码处理 // String imgFile = 'd://test.jpg';//待处理的图片 //String imgFile='F://upload//1.jpg';////可以 // String imgFile='F://upload//软工大作业.ppt';////可以 String imgFile='F://upload//爱的勇气.mp3';//不可以 // String imgFile='F://upload//upload.rar';//可以 InputStream in = null; byte[] data = null; //读取图片字节数组 try { in = new FileInputStream(imgFile); data = new byte[in.available()]; in.read(data); in.close(); } catch (IOException e) { e.printStackTrace(); } //对字节数组Base64编码 BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(data);//返回Base64编码过的字节数组字符串 } ///GetImageStr }
手机端：
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;// 设置请求超时10秒钟 private static final int SO_TIMEOUT = 10*60 * 1000; // 设置请求超时时间10秒钟 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 自动生成的方法存根 Log.i('button1', 'button1'); fun_HttpPost(); } }); } public void fun_HttpPost() { new Thread(new Runnable() { @Override public void run() { // TODO 自动生成的方法存根 String urlStr = 'http://192.168.0.102:8080/download/servlet/download'; HttpPost request = new HttpPost(urlStr); try { HttpClient client = getHttpClient(); // 执行请求返回相应 HttpResponse response = client.execute(request); // 判断是否请求成功 if (response.getStatusLine().getStatusCode() == 200) { // 获得响应信息 String responseMessage = EntityUtils.toString(response .getEntity()); Log.i('responseMessage', responseMessage + ',长度：' + responseMessage.length()); GenerateImage(responseMessage); Log.i('生成成功', '生成成功'); } } catch (Exception e) { e.printStackTrace(); } }// //run() }).start(); }// /fun_register() //base64字符串转化成图片 public static boolean GenerateImage(String imgStr) { //对字节数组字符串进行Base64解码并生成图片 if (imgStr == null) //图像数据为空 return false; Decoder.BASE64Decoder decoder = new Decoder.BASE64Decoder(); try { //Base64解码 byte[] b = decoder.decodeBuffer(imgStr); for(int i=0;i<b.length;++i) { if(b[i]<0) {//调整异常数据 b[i]+=256; } } //生成jpeg图片 // String imgFilePath = 'd://222.jpg';//新生成的图片 // String imgFilePath = 'F://upload//1_2.jpg';///可以 //String imgFilePath = 'F://upload//软工大作业_2.ppt';//可以// String imgFilePath='F://upload//upload_2.rar'; // String imgFilePath='/sdcard/1spray/1_2.jpg';//可以 // String imgFilePath = '/sdcard/1spray/软工大作业_2.ppt';//可以 String imgFilePath ='/sdcard/1spray/爱的勇气_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，并设置超时 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: android:layout_width='wrap_content' android:layout_height='wrap_content' android:text='@string/hello_world' /> <Button android: 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: 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' /> <!-- 使用网络功能所需权限 --> <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离线地图和cache功能需要读写外部存储器 --> <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>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。
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