android通过servlet服务器保存文件到手机

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;@Overrideprotected 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() {@Overridepublic 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() {@Overridepublic 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: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>

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