• Android :okhttp+Springmvc文件解析器实现android向服务器上传照片


    A.前言:为了解决安卓端向服务器上传照片的问题

      1.获得相册权限,选取照片,取到照片的url

      2.使用okhttp访问服务器并向服务器传照片

      3.配置springmvc文件解析器

      4.搭建服务器,获取数据保存照片

     B.Android添加一个按钮和一个ImageView,设置它的点击事件,打开相册选择照片,解析得到照片的本机url,并把照片显示到ImageView里

        添加权限:

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.SET_WALLPAPER" />

        导包:

    compile 'com.squareup.okhttp3:okhttp:3.4.1'

         按钮事件:打开相册选取照片    调用startActivityForResult();

     protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Button button=(Button)findViewById(R.id.button   );w
            image=(ImageView) findViewById(R.id.image);
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                    startActivityForResult(intent, 100);
                }
            });
        }

         重写onActivityResult()方法  解析照片获得url 覆给全局变量,并把照片显示到imageView。调用自定义的uploadImage(),向服务器发送数据

     @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            switch (requestCode) {
                case 100:
                    switch (resultCode) {
                        case RESULT_OK:
                            Uri uri = data.getData();
                           img_src = uri.getPath();//这是本机的图片路径
                            ContentResolver cr = this.getContentResolver();
                            try {
                                Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                            /* 将Bitmap设定到ImageView */
                                image.setImageBitmap(bitmap);
                                String[] proj = {MediaStore.Images.Media.DATA};
                                CursorLoader loader = new CursorLoader(this, uri, proj, null, null, null);
                                Cursor cursor = loader.loadInBackground();
                                if (cursor != null) {
                                    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                                    cursor.moveToFirst();
                                    img_src = cursor.getString(column_index);//图片实际路径
                                }
    
                                cursor.close();
                                this.uploadImage();
                            } catch (FileNotFoundException e) {
                                Log.e("cwd", e.getMessage(), e);
                            }
    
                            break;
                    }
                    break;
    
            }
        }

          实现uploadImage(),使用okhttp向服务器传数据

     public void uploadImage() {
             Log.d("cwd","uploadImage");
            new  Thread(new Runnable() {
                @Override
                public void run() {
                    File file=new File(img_src);
                    RequestBody requestBody = new MultipartBody.Builder()
                                    .setType(MultipartBody.FORM)
                        .addFormDataPart("jsonfile", file.getName(),
                                RequestBody.create(MediaType.parse("multipart/form-data"), file))//文件
                            .build();
                      Request request = new Request.Builder()
                          .url("http://3i157k1732.qicp.vip/springmvc03/jsonsrc").post(requestBody)
                              .build();
                    OkHttpClient client=new OkHttpClient();
                    client.newCall(request).enqueue(new Callback() {
                        @Override
                        public void onFailure(Call call, IOException e) {
                            Log.d("cwd", "上传失败"+e.getLocalizedMessage());
                        }
    
                        @Override
                        public void onResponse(Call call, Response response) throws IOException {
                            Log.d("cwd","上传成功"+response.body().string());
                        }
                    });
                }
            }).start();
    
        }

    C.服务器端,配置springmvc文件解析器,定义照片数据处理的方法

        idea导包:

    <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.10.0</version>
    </dependency>

        在Springmvc的配置文件中配置文件解析器:注意   bean 的id必须为multipartResolver

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <property name="maxUploadSize" value="10485760"/>
    
        </bean>

         定义处理方法:  必须使用RequestParam来绑定参数,值为okhttp上传数据的key值

            注意!!!

    @RequestMapping(value = "/jsonsrc")
        public String jsonsrc(HttpServletRequest request,@RequestParam("jsonfile") MultipartFile jsonfile) throws IOException {
            System.out.println("jsonsrc");
            String path=request.getSession().getServletContext().getRealPath("/uploads/");
            File file=new File(path);
            if(!file.exists()){
                file.mkdir();
            }
            String filename=jsonfile.getOriginalFilename();
            String uuid= UUID.randomUUID().toString().replace("-","");
            filename=uuid+filename;
            jsonfile.transferTo(new File(path,filename));
            return "succes";
        }

     这样就完成了!!!

    okhttp用来访问网络,可以拿数据,也可以向服务器传数据!

    使用springmvc文件解析器,让我们不用去注重解析文件,只需要保存文件!

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  • 原文地址:https://www.cnblogs.com/miwujun/p/12927674.html
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