Android上傳圖片到服務器

android上傳圖片到服務器（使用base64字節流的形式通過 AsyncHttpClient框架)

前端 andoid activity用到的函數 AsyncHttpClient 是一個框架提供的庫 可以異步傳輸，使用時需下載android-async-http-1.4.4.jar包導入到項目中.

    public static void reg(final Context cont,Bitmap photodata,String regData) {

            try {

                ByteArrayOutputStream baos = new ByteArrayOutputStream();


            //將bitmap一字節流輸出 Bitmap.CompressFormat.PNG 壓縮格式，100：壓縮率，baos：字節流  
            photodata.compress(Bitmap.CompressFormat.PNG, 100, baos);  
            baos.close();  
            byte[] buffer = baos.toByteArray();  
            System.out.println("圖片的大小："+buffer.length);  

            //將圖片的字節流數據加密成base64字符輸出  
            String photo = Base64.encodeToString(buffer, 0, buffer.length,Base64.DEFAULT);  

            //photo=URLEncoder.encode(photo,"UTF-8");  
            RequestParams params = new RequestParams();  
                    params.put("photo", photo);  
                        params.put("name", "woshishishi");//傳輸的字符數據  
                        String url = "http://10.0.2.2:8080/IC_Server/servlet/RegisterServlet1";  


                        AsyncHttpClient client = new AsyncHttpClient();  
                        client.post(url, params, new AsyncHttpResponseHandler() {  
                        @Override    
                    public void onSuccess(int statusCode, String content){    
                    Toast.makeText(cont, "頭像上傳成功!"+content, 0)  
                     .show();   
                         }    
                    @Override    
                    public void onFailure(Throwable e, String data){    
                    Toast.makeText(cont, "頭像上傳失敗!", 0)  
                        .show();   
                }  
            });  

        } catch (Exception e) {  
            e.printStackTrace();  
        }  

    }  

</pre> 

 服務器中 serverlet中的代碼：
 package uestc.app.ic.server.servlet;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Decoder;
public class RegisterServlet1 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");

        response.setCharacterEncoding("utf-8");

        response.setContentType("text/html");

        String photo = request.getParameter("photo");

        String name = request.getParameter("name");

    try {  

        // 對base64數據進行解碼 生成 字節數組，不能直接用Base64.decode（）；進行解密  
        byte[] photoimg = new BASE64Decoder().decodeBuffer(photo);  
        for (int i = 0; i < photoimg.length; ++i) {  
            if (photoimg[i] < 0) {  
                // 調整異常數據  
                photoimg[i] += 256;  
            }  
        }  

        // byte[] photoimg = Base64.decode(photo);//此處不能用Base64.decode（）方法解密，我調試時用此方法每次解密出的數據都比原數據大  所以用上面的函數進行解密，在網上直接拷貝的，花了好幾個小時才找到這個錯誤（菜鳥不容易啊）  
        System.out.println("圖片的大小：" + photoimg.length);  
        File file = new File("e:", "decode.png");  
        File filename = new File("e:\\name.txt");  
        if (!filename.exists()) {  
            file.createNewFile();  
        }  
        if (!file.exists()) {  
            file.createNewFile();  
        }  
        FileOutputStream out = new FileOutputStream(file);  
        FileOutputStream out1 = new FileOutputStream(filename);  
        out1.write(name.getBytes());  
        out.write(photoimg);  
        out.flush();  
        out.close();  
        out1.flush();  
        out1.close();  
    } catch (Exception e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
    }  

</pre>