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();            }