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("http://img.558idc.com/uploadfile/");
    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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