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:
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<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:
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compile 'com.squareup.okhttp3:okhttp:3.4.1' |
按钮事件:打开相册选取照片 调用startActivityForResult();
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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
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@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
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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:
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<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
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<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!!!
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@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!
总结
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原文链接:https://www.cnblogs.com/miwujun/archive/2020/05/21/12927674.html