移动后端云平台Bmob介绍

BmobFile对象 ，然后通过该对象的getFileUrl（）方法获得下载链接，最后通过链接下载。下面是一个实现了添加数据、查询数据、文件上传、文件下载、推送功能的例子：

package com.example.bombexample;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONObject;

import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;

import cn.bmob.push.BmobPush;
import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobInstallation;
import cn.bmob.v3.BmobPushManager;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.datatype.BmobFile;
import cn.bmob.v3.listener.FindListener;
import cn.bmob.v3.listener.GetCallback;
import cn.bmob.v3.listener.GetListener;
import cn.bmob.v3.listener.SaveListener;
import cn.bmob.v3.listener.UploadFileListener;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

	private List<User> users=new ArrayList<User>();
	private HttpUtils httpUtils=null;
	BmobFile bmobFile =null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		Bmob.initialize(this, "3b728750d1755e56dd680fa76c4a8386");
		
		  // 使用推送服务时的初始化操作
	    BmobInstallation.getCurrentInstallation(this).save();
	    // 启动推送服务
	    BmobPush.startWork(this, "3b728750d1755e56dd680fa76c4a8386");
	    httpUtils=new HttpUtils();
		
	}
	
	// 向服务期添加数据
	public void add(View view)
	{ 
		
		for(int i=0;i<10;i++)
		{
			User user=new User();
			user.setName("gaigai"+i);
			user.setPassword("hlb"+i);
			users.add(user);
		}
		
		for(final User user:users)
		{
			
			user.save(this, new SaveListener() {
				
				@Override
				public void onSuccess() {
					
					Toast.makeText(MainActivity.this, "添加数据成功"+user.getObjectId(), Toast.LENGTH_SHORT).show();
				}
				
				@Override
				public void onFailure(int arg0, String arg1) {
					
					Toast.makeText(MainActivity.this, "添加数据失败", Toast.LENGTH_SHORT).show();
					
				}
			});
		}
		
	}
	
	// 查询服务器数据
	public void query(View view)
	{
		BmobQuery<User> query=new BmobQuery<User>(); 
		query.getObject(this,"f69efc2ca8",new GetListener<User>() {
			
			@Override
			public void onSuccess(User arg0) {
				
				Toast.makeText(MainActivity.this,
						arg0.getName()+" "+arg0.getPassword(), Toast.LENGTH_SHORT).show();
				
			}
			
			@Override
			public void onFailure(int arg0, String arg1) {
				
			}
		});
	}
	
	// 查询服务器所有数据
	public void queryAll(View view)
	{
		BmobQuery<User> query=new BmobQuery<User>();
		query.findObjects(this, new FindListener<User>() {
			
			@Override
			public void onSuccess(List<User> arg0) {
				
				Toast.makeText(MainActivity.this, arg0.size()+"", Toast.LENGTH_SHORT).show();
			}
			
			@Override
			public void onError(int arg0, String arg1) {
				// TODO Auto-generated method stub
				
			}
		});
		
	}
	
	
	// 推送功能
	public void data_push(View view)
	{
		BmobPushManager bmobPush = new BmobPushManager(this);
		bmobPush.pushMessageAll("哈哈哈哈.");
		
	}
	
	
	// 文件上传
	public void upload(View v) throws IOException
	{
		InputStream in=getAssets().open("byx.jpg");
		File file=new File(Environment.getExternalStorageDirectory()+"/byx.jpg");
		if(!file.exists())
		{
			file.createNewFile();
		}
		
		FileOutputStream out=new FileOutputStream(file);
		int len=0;
		byte []buffer=new byte[1024];
		
		while((len=in.read(buffer))!=-1)
		{
			out.write(buffer, 0, len);
		}
		
		out.close();
		in.close();
		bmobFile = new BmobFile(file);
		bmobFile.upload(this, new UploadFileListener() {
			
			@Override
			public void onSuccess() {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, bmobFile.getFileUrl(MainActivity.this)+"", Toast.LENGTH_SHORT).show();
				Log.i("Url", bmobFile.getFileUrl(MainActivity.this));
			}
			
			@Override
			public void onFailure(int arg0, String arg1) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "上传文件失败", Toast.LENGTH_SHORT).show();
			}
		});
		
	}
	
	
	// 文件下载
	
	public void download(View v)
	{
		BmobQuery<Test> query=new BmobQuery<Test>();
		query.getObject(this, "nt7rAAAG", new GetListener<Test>() {
			
			@Override
			public void onSuccess(Test arg0) {
				
				arg0.getThumbnail().getFileUrl(MainActivity.this);
				Log.i("url",arg0.getThumbnail().getFileUrl(MainActivity.this));
				downloadPic(arg0.getThumbnail().getFileUrl(MainActivity.this),arg0.getThumbnail().getFilename());
			}
			
			@Override
			public void onFailure(int arg0, String arg1) {
				// TODO Auto-generated method stub
				
			}
		});
		
	}
	
	
	public void downloadPic(String url,String filename)
	{
		httpUtils.download(url, Environment.getExternalStorageDirectory()+"/"+filename, new RequestCallBack<File>() {
			
			@Override
			public void onSuccess(ResponseInfo<File> responseInfo) {
				Log.i("download","文件存储路径"+responseInfo.result.getPath());
			}
			
			@Override
			public void onFailure(HttpException error, String msg) {
				// TODO Auto-generated method stub
				
			}
		});
	}
}