A.前言:為了解決安卓端向服務器上傳照片的問題
1.獲得相冊權限,選取照片,取到照片的url
2.使用okhttp訪問服務器并向服務器傳照片
3.配置springmvc檔案決議器
4.搭建服務器,獲取資料保存照片
B.Android添加一個按鈕和一個ImageView,設定它的點擊事件,打開相冊選擇照片,決議得到照片的本機url,并把照片顯示到ImageView里
添加權限:
<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" />
導包:
compile 'com.squareup.okhttp3:okhttp:3.4.1'
按鈕事件:打開相冊選取照片 呼叫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); } }); }
重寫onActivityResult()方法 決議照片獲得url 覆給全域變數,并把照片顯示到imageView,呼叫自定義的uploadImage(),向服務器發送資料
@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();//這是本機的圖片路徑 ContentResolver cr = this.getContentResolver(); try { Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri)); /* 將Bitmap設定到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);//圖片實際路徑 } cursor.close(); this.uploadImage(); } catch (FileNotFoundException e) { Log.e("cwd", e.getMessage(), e); } break; } break; } }
實作uploadImage(),使用okhttp向服務器傳資料
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))//檔案 .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", "上傳失敗"+e.getLocalizedMessage()); } @Override public void onResponse(Call call, Response response) throws IOException { Log.d("cwd","上傳成功"+response.body().string()); } }); } }).start(); }
C.服務器端,配置springmvc檔案決議器,定義照片資料處理的方法
idea導包:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.10.0</version>
</dependency>
在Springmvc的組態檔中組態檔決議器:注意 bean 的id必須為multipartResolver
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="10485760"/> </bean>
定義處理方法: 必須使用RequestParam來系結引數,值為okhttp上傳資料的key值
注意!!!

@RequestMapping(value = "https://www.cnblogs.com/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"; }
這樣就完成了!!!
okhttp用來訪問網路,可以拿資料,也可以向服務器傳資料!
使用springmvc檔案決議器,讓我們不用去注重決議檔案,只需要保存檔案!
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標籤:Android
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