2020年5月21日星期四

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

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.faster <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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