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!
总结
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