android上传图片到服务器（使用base64字节流的形式通过 AsyncHttpClient框架)

前端 andoid activity用到的函数 AsyncHttpClient 是一个框架提供的库 可以异步传输，使用时需下载android-async-http-1.4.4.jar包导入到项目中.

    public static void reg(final Context cont,Bitmap photodata,String regData) {  
            try {  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                  
                //将bitmap一字节流输出 Bitmap.CompressFormat.PNG 压缩格式，100：压缩率，baos：字节流  
                photodata.compress(Bitmap.CompressFormat.PNG, 100, baos);  
                baos.close();  
                byte[] buffer = baos.toByteArray();  
                System.out.println("图片的大小："+buffer.length);  
                  
                //将图片的字节流数据加密成base64字符输出  
                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");//传输的字符数据  
                            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, "头像上传成功!"+content, 0)  
                         .show();   
                             }    
                        @Override    
                        public void onFailure(Throwable e, String data){    
                        Toast.makeText(cont, "头像上传失败!", 0)  
                            .show();   
                    }  
                });  
       
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
      
        }  

服务器中 serverlet中的代码：

 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 {  
  
            // 对base64数据进行解码 生成 字节数组，不能直接用Base64.decode（）；进行解密  
            byte[] photoimg = new BASE64Decoder().decodeBuffer(photo);  
            for (int i = 0; i < photoimg.length; ++i) {  
                if (photoimg[i] < 0) {  
                    // 调整异常数据  
                    photoimg[i] += 256;  
                }  
            }  
  
            // byte[] photoimg = Base64.decode(photo);//此处不能用Base64.decode（）方法解密，我调试时用此方法每次解密出的数据都比原数据大  所以用上面的函数进行解密，在网上直接拷贝的，花了好几个小时才找到这个错误（菜鸟不容易啊）  
            System.out.println("图片的大小：" + 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();  
        }