Android上传图片到服务器

一.android需要导入异步请求的jar包 AsyncHttpClient 

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();//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();
        }

    }

二.服务器的代码（用的是springmvc）

@RequestMapping("/post")
    public void post(HttpServletResponse response , Post post
            //,MultipartFile image
            ,String image
            )throws IOException{
        Receipt receipt = new Receipt();
        try {
            /*// 二进制流  上传图片
            if(image!=null && image.getOriginalFilename()!=null && image.getOriginalFilename().length()>0){
                //原始名称
                String originalFilename = image.getOriginalFilename();
                //新的图片名称
                String newFileName = UUID.randomUUID() + originalFilename.substring(originalFilename.lastIndexOf("."));
                String saveName = ImageUtil.findFilePathByFileName(newFileName);
                System.out.println("O______________________________________K");
                //新图片
                File newFile = new File(saveName);
                if(!newFile.exists()){
                    newFile.mkdir();
                }
                //将内存中的数据写入磁盘
                image.transferTo(newFile);
                System.out.println("O______________________________________");
                //将新图片名称写到itemsCustom中
                post.setImg(newFileName);
            }else {
                post.setImg("");
            }*/

            //  =================================                 字符串接收文件
            if(image!=null && image.length()>0){

                byte[] photoimg = new BASE64Decoder().decodeBuffer(image);
                for (int i = 0; i < photoimg.length; ++i) {
                    if (photoimg[i] < 0) {
                        // 调整异常数据
                        photoimg[i] += 256;
                    }
                }
                String newFileName = UUID.randomUUID() + ".png";
                String saveName = ImageUtil.findFilePathByFileName(newFileName);
                File newFile = new File(saveName);
                if(!newFile.exists()){
                    newFile.createNewFile();
                }
                FileOutputStream out = new FileOutputStream(newFile);
                out.write(photoimg);
                out.flush();
                out.close();
                post.setImg(newFileName);
                logger.debug("文件接收成功");
            }else {
                post.setImg("");
            }

三.工具类

public static String rootPathString = "WebRoot/WEB-INF/upload";

    public static String findFilePathByFileName(String fileName) {
        if(fileName == null || fileName.trim().isEmpty()){
            return "/default.png";
        }
        int hashcode = fileName.hashCode();
        int dir1 = hashcode&0xf;  //0--15
        int dir2 = (hashcode&0xf0)>>4;  //0-15
        String dir = rootPathString + "/" + dir1 + "/" + dir2;  //upload\2\3  upload\3\5
        File file = new File(dir);
        if(!file.exists()){
            //创建目录
            file.mkdirs();
        }
        return dir+"/"+fileName;
    }

ncHttpClient