1. GAE - Using CloudStorage
GAE中使用CloudStorage中的資源可以省略一些認證動作，透過FileReadChannel即可快速的取得
存取CloudStorage的方法，飯粒如下：
Step1: 首先，Library的部分需要import下面藍色部分
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.util.logging.Logger;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.appengine.api.files.AppEngineFile;
import com.google.appengine.api.files.FileReadChannel;
import com.google.appengine.api.files.FileService;
import com.google.appengine.api.files.FileServiceFactory;
import com.google.appengine.api.files.FileWriteChannel;
import com.google.appengine.api.files.GSFileOptions.GSFileOptionsBuilder;
import com.google.appengine.api.files.LockException;
最後，透過FileReadChannel讀取指定的CloudStorage檔案
public void readFile(HttpServletRequest req, HttpServletResponse resp)
throws FileNotFoundException, LockException, IOException {
// Get the file service
FileService fileService = FileServiceFactory.getFileService();
boolean lockForRead = false;
String filename = "/gs/mitac­cp300­eu/test.txt";
AppEngineFile readableFile = new AppEngineFile(filename);
FileReadChannel readChannel =
fileService.openReadChannel(readableFile, lockForRead);
// Read the file in whichever way you'd like
BufferedReader reader =
new BufferedReader(Channels.newReader(readChannel, "UTF8"));
String line = "";
int i = 0;
while((line = reader.readLine()) != null){
resp.getWriter().println(i + ": " + line);
i++;
}
readChannel.close();
}

2.
附註：
目前Google著手進行大規模的API Refactory，看起來將會讓所有的API遵循使用RESTful的呼叫方
式，因此API終會實作Credential的認證流程，本範例1.8.9版本以前測試均可以正常執行。