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, 0, 0);        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, 1);        startActivityForResult(camera, 1);    }    /*      * 调用图库      * */    public void phonePhoto(){        Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);        startActivityForResult(intent,2);    }    @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==1){            startPicZoom(Uri.fromFile(new File(capturPath)));        }        //相册返回结果，调用系统裁剪        else if (requestCode==2){            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==3){            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  2         public void uploadImg(HttpServletRequest request, HttpServletResponse response)  3                 throws IOException {  4             String userName = request.getParameter("userName");  5             System.out.println("从Android获得的UserNAme为："+userName);  6             PrintWriter out = response.getWriter();  7             // 创建文件项目工厂对象  8             DiskFileItemFactory factory = new DiskFileItemFactory();  9             // 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 10             String upload = this.getServletContext().getRealPath("upload/photo"); 11              12             // 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 13             String temp = System.getProperty("java.io.tmpdir"); 14             // 设置缓冲区大小为 5M 15             factory.setSizeThreshold(1024 * 1024 * 5); 16             // 设置临时文件夹为temp 17             factory.setRepository(new File(temp)); 18             // 用工厂实例化上传组件,ServletFileUpload 用来解析文件上传请求 19             ServletFileUpload servletFileUpload = new ServletFileUpload(factory); 20             String path = null; 21             // 解析结果放在List中 22             try { 23                 List<FileItem> list = servletFileUpload.parseRequest(request); 24  25                 for (FileItem item : list) { 26                     String name = item.getFieldName(); 27                     InputStream is = item.getInputStream(); 28  29                     if (name.contains("content")) { 30                         System.out.println(inputStream2String(is)); 31                     } else if (name.contains("img")) { 32                         try { 33                             path = upload+"\\"+item.getName(); 34                             inputStream2File(is, path); 35                             TestMethod tm = new TestMethod();                                int c = tm.insertImages(userName, ReadPhoto(path)); 42                             System.out.println(c); 43                             break; 44                         } catch (Exception e) { 45                             e.printStackTrace(); 46                         } 47                     } 48                 } 49                 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 50             } catch (FileUploadException e) { 51                 e.printStackTrace(); 52                 System.out.println("failure"); 53                 out.write("failure"); 54             } 55  56             out.flush(); 57             out.close(); 58              59              60              61              62         } 63         // 流转化成字符串 64         public static String inputStream2String(InputStream is) throws IOException { 65             ByteArrayOutputStream baos = new ByteArrayOutputStream(); 66             int i = -1; 67             while ((i = is.read()) != -1) { 68                 baos.write(i); 69             } 70             return baos.toString(); 71         } 72  73         // 流转化成文件 74         public static void inputStream2File(InputStream is, String savePath) throws Exception { 75             System.out.println("文件保存路径为:" + savePath); 76             File file = new File(savePath); 77             InputStream inputSteam = is; 78             BufferedInputStream fis = new BufferedInputStream(inputSteam); 79             FileOutputStream fos = new FileOutputStream(file); 80             int f; 81             while ((f = fis.read()) != -1) { 82                 fos.write(f); 83             } 84             fos.flush(); 85             fos.close(); 86             fis.close(); 87             inputSteam.close(); 88  89         } 90         public static byte[] ReadPhoto(String path) { 91             File file = new File(path); 92             FileInputStream fin; 93             // 建一个缓冲保存数据 94             ByteBuffer nbf = ByteBuffer.allocate((int) file.length()); 95             byte[] array = new byte[1024]; 96             int offset = 0, length = 0; 97             byte[] content = null; 98             try { 99                 fin = new FileInputStream(file);100                 while((length = fin.read(array)) > 0){101                     if(length != 1024) nbf.put(array,0,length);102                     else nbf.put(array);103                     offset += length;104                 }105                  fin.close();106                  content = nbf.array();107             } catch (FileNotFoundException e) {108                 // TODO Auto-generated catch block109                 e.printStackTrace();110             } catch (IOException e) {111                 // TODO Auto-generated catch block112                 e.printStackTrace();113             }114             return content;115         }

 1     查询数据库update     public class TestMethod { 2     public int insertImages(String desc,byte[] content) { 3         Connection con = DBcon.getConnection(); 4         PreparedStatement pstmt = null; 5         String sql = "update user set image = ? " + 6                 "where userName = ? "; 7         int affCount = 0; 8         try { 9             pstmt = con.prepareStatement(sql);10             pstmt.setBytes(1, content);11             pstmt.setString(2, desc);12             affCount = pstmt.executeUpdate();13         } catch (SQLException e1) {14             // TODO Auto-generated catch block15             e1.printStackTrace();16         }17         return affCount;18     }19 }