Android端上传图片到后台，存储到数据库中 详细代码

首先点击头像弹出popwindow,点击相册，相机，调用手机自带的裁剪功能，然后异步任务类访问服务器，上传头像，保存到数据库中，

下面写出popwindow的代码

 //设置popwindow
    public PopupWindow getPopWindow(View view){
        PopupWindow popupWindow=new PopupWindow(view,
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT,true);
        // popupWindow.setFocusable(true);
        //点击pop外面是否消失
        popupWindow.setOutsideTouchable(true);
        anim底下的动画效果
        popupWindow.setAnimationStyle(R.style.popStyle);
        //设置背景透明度
        backgroundAlpha(0.3f);
        //————————
        //设置View隐藏
        loginHead.setVisibility(View.GONE);
        popupWindow.setBackgroundDrawable(new ColorDrawable());
        popupWindow.showAtLocation(loginHead, Gravity.BOTTOM, , );
        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                //设置背景透明度
                backgroundAlpha(1f);
                //设置View可见
                loginHead.setVisibility(View.VISIBLE);
            }
        });
        return popupWindow;
    }
    //设置透明度
    public void  backgroundAlpha (float bgAlpha){
        WindowManager.LayoutParams lp=
                getWindow().getAttributes();
        lp.alpha=bgAlpha;
        getWindow().setAttributes(lp);
    }

下面为调用相机 相册时所用的方法

UrlUtil.IMG_URL为访问servlet的路径

//调用相机
    private String capturPath="";
    public  void tekePhoto(){
        Intent camera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        File parent = FileUitlity.getInstance(getApplicationContext())
                .makeDir("head_img");
        capturPath=parent.getPath()
                +File.separatorChar
                +System.currentTimeMillis()
                +".jpg";
        camera.putExtra(MediaStore.EXTRA_OUTPUT,
                Uri.fromFile(new File(capturPath)));
        camera.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, );
        startActivityForResult(camera, );
    }
    /*
      * 调用图库
      * */
    public void phonePhoto(){
        Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent,);

    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode != Activity.RESULT_OK){
            return ;
        }
        //相机返回结果，调用系统裁剪
        if(requestCode==){
            startPicZoom(Uri.fromFile(new File(capturPath)));
        }
        //相册返回结果，调用系统裁剪
        else if (requestCode==){
            Cursor cursor=
                    getContentResolver()
                            .query(data.getData()
                                    , new String[]{MediaStore.Images.Media.DATA}
                                    , null, null, null);
            cursor.moveToFirst();
             capturPath=cursor.getString(
                    cursor.getColumnIndex(
                            MediaStore.Images.Media.DATA));
            cursor.close();
            startPicZoom(Uri.fromFile(new File(capturPath)));

        }else if(requestCode==){
            Bundle bundle= data.getExtras();
            if(bundle!=null){
                final Bitmap bitmap  = bundle.getParcelable("data");
                loginHead.setImageBitmap(bitmap);
                pw.dismiss();
                AlertDialog.Builder  alter =
                        new AlertDialog.Builder(this)
                                .setPositiveButton("上传", new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog, int which) {
                                       上传时用的方法
                                        File file = new File(capturPath);
                                        new Upload(file).execute(UrlUtil.IMG_URL+"&userName="+myAplication.getUsername());

                                        Toast.makeText(getBaseContext(),UrlUtil.IMG_URL+"&userName="+myAplication.getUsername(),Toast.LENGTH_SHORT).show();
                                        //String result =  UploadImg.uploadFile(file, UrlUtil.IMG_URL);
                                       // Toast.makeText(getBaseContext(),result,Toast.LENGTH_SHORT).show();
                                        /*uploadImg(bitmap);*/
                                    }
                                }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                            }
                        });
                AlertDialog dialog = alter.create();
                dialog.show();
            }

        }
    }

下面为异步任务类

 UploadImg.uploadFile(file,strings[0]);为上传的任务类，在异步任务类中调用

public class Upload extends AsyncTask<String,Void,String> {
        File file;
        public Upload(File file){
            this.file = file;
        }
        @Override
        protected String doInBackground(String... strings) {
            return UploadImg.uploadFile(file,strings[0]);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            if(s != null){
                Toast.makeText(getBaseContext(),"上传成功",Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(getBaseContext(),"上传失败",Toast.LENGTH_SHORT).show();
            }
        }
    }

上传所用的任务类
public class UploadImg {
    private static final String TAG = "uploadFile";
    private static final int TIME_OUT = 10*1000;   //超时时间
    private static final String CHARSET = "utf-8"; //设置编码
    /**
     * android上传文件到服务器
     * @param file  需要上传的文件
     * @param RequestURL  请求的rul
     * @return  返回响应的内容
     */
    public static String uploadFile(File file, String RequestURL){
        String result = null;
        String  BOUNDARY =  UUID.randomUUID().toString();  //边界标识   随机生成
        String PREFIX = "--" , LINE_END = "\r\n";
        String CONTENT_TYPE = "multipart/form-data";   //内容类型

        try {
            URL url = new URL(RequestURL);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(TIME_OUT);
            conn.setConnectTimeout(TIME_OUT);
            conn.setDoInput(true);  //允许输入流
            conn.setDoOutput(true); //允许输出流
            conn.setUseCaches(false);  //不允许使用缓存
            conn.setRequestMethod("POST");  //请求方式
            conn.setRequestProperty("Charset", CHARSET);  //设置编码
            conn.setRequestProperty("connection", "keep-alive");
            conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);
            conn.setRequestProperty("action", "upload");
            conn.connect();

            if(file!=null){
                /**
                 * 当文件不为空，把文件包装并且上传
                 */
                DataOutputStream dos = new DataOutputStream( conn.getOutputStream());
                StringBuffer sb = new StringBuffer();
                sb.append(PREFIX);
                sb.append(BOUNDARY);
                sb.append(LINE_END);
                /**
                 * 这里重点注意：
                 * name里面的值为服务器端需要key   只有这个key 才可以得到对应的文件
                 * filename是文件的名字，包含后缀名的   比如:abc.png
                 */

                sb.append("Content-Disposition: form-data; name=\"img\"; filename=\""+file.getName()+"\""+LINE_END);
                sb.append("Content-Type: application/octet-stream; charset="+CHARSET+LINE_END);
                sb.append(LINE_END);
                dos.write(sb.toString().getBytes());
                InputStream is = new FileInputStream(file);
                byte[] bytes = new byte[1024];
                int len = 0;
                while((len=is.read(bytes))!=-1){
                    dos.write(bytes, 0, len);
                }
                is.close();
                dos.write(LINE_END.getBytes());
                byte[] end_data = (PREFIX+BOUNDARY+PREFIX+LINE_END).getBytes();
                dos.write(end_data);
                dos.flush();
                /**
                 * 获取响应码  200=成功
                 * 当响应成功，获取响应的流
                 */
                int res = conn.getResponseCode();
                if(res==200){
                    InputStream input =  conn.getInputStream();
                    StringBuffer sb1= new StringBuffer();
                    int ss ;
                    while((ss=input.read())!=-1){
                        sb1.append((char)ss);
                    }
                    result = sb1.toString();
                    System.out.println(result);
                }
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
}

上面就是android的代码，下面写出后台servlet的代码，

 //从android端 上传图片
         public void uploadImg(HttpServletRequest request, HttpServletResponse response)
                 throws IOException {
             String userName = request.getParameter("userName");
             System.out.println("从Android获得的UserNAme为："+userName);
             PrintWriter out = response.getWriter();
             // 创建文件项目工厂对象
             DiskFileItemFactory factory = new DiskFileItemFactory();
             // 设置文件上传路径
                需要在webRoot下新建一个名为upload的文件夹，在里面再建个名为photo的文件夹
             String upload = this.getServletContext().getRealPath("upload/photo");

             // 获取系统默认的临时文件保存路径，该路径为Tomcat根目录下的temp文件夹
             String temp = System.getProperty("java.io.tmpdir");
             // 设置缓冲区大小为 5M
             factory.setSizeThreshold(1024 * 1024 * 5);
             // 设置临时文件夹为temp
             factory.setRepository(new File(temp));
             // 用工厂实例化上传组件,ServletFileUpload 用来解析文件上传请求
             ServletFileUpload servletFileUpload = new ServletFileUpload(factory);
             String path = null;
             // 解析结果放在List中
             try {
                 List<FileItem> list = servletFileUpload.parseRequest(request);

                 for (FileItem item : list) {
                     String name = item.getFieldName();
                     InputStream is = item.getInputStream();

                     if (name.contains("content")) {
                         System.out.println(inputStream2String(is));
                     } else if (name.contains("img")) {
                         try {
                             path = upload+"\\"+item.getName();
                             inputStream2File(is, path);
                             TestMethod tm = new TestMethod();
                                int c = tm.insertImages(userName, ReadPhoto(path));
                             System.out.println(c);
                             break;
                         } catch (Exception e) {
                             e.printStackTrace();
                         }
                     }
                 }
                 out.write(path);  //这里我把服务端成功后，返回给客户端的是上传成功后路径
             } catch (FileUploadException e) {
                 e.printStackTrace();
                 System.out.println("failure");
                 out.write("failure");
             }

             out.flush();
             out.close();

         }
         // 流转化成字符串
         public static String inputStream2String(InputStream is) throws IOException {
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             int i = -1;
             while ((i = is.read()) != -1) {
                 baos.write(i);
             }
             return baos.toString();
         }

         // 流转化成文件
         public static void inputStream2File(InputStream is, String savePath) throws Exception {
             System.out.println("文件保存路径为:" + savePath);
             File file = new File(savePath);
             InputStream inputSteam = is;
             BufferedInputStream fis = new BufferedInputStream(inputSteam);
             FileOutputStream fos = new FileOutputStream(file);
             int f;
             while ((f = fis.read()) != -1) {
                 fos.write(f);
             }
             fos.flush();
             fos.close();
             fis.close();
             inputSteam.close();

         }
         public static byte[] ReadPhoto(String path) {
             File file = new File(path);
             FileInputStream fin;
             // 建一个缓冲保存数据
             ByteBuffer nbf = ByteBuffer.allocate((int) file.length());
             byte[] array = new byte[1024];
             int offset = 0, length = 0;
             byte[] content = null;
             try {
                 fin = new FileInputStream(file);
                 while((length = fin.read(array)) > 0){
                     if(length != 1024) nbf.put(array,0,length);
                     else nbf.put(array);
                     offset += length;
                 }
                  fin.close();
                  content = nbf.array();
             } catch (FileNotFoundException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
             return content;
         }

 1
     查询数据库update
     public class TestMethod {
     public int insertImages(String desc,byte[] content) {
         Connection con = DBcon.getConnection();
         PreparedStatement pstmt = null;
         String sql = "update user set image = ? " +
                 "where userName = ? ";
         int affCount = 0;
         try {
             pstmt = con.prepareStatement(sql);
             pstmt.setBytes(1, content);
             pstmt.setString(2, desc);
             affCount = pstmt.executeUpdate();
         } catch (SQLException e1) {
             // TODO Auto-generated catch block
             e1.printStackTrace();
         }
         return affCount;
     }
 }