如何在Google App Engine (JAVA)中读取文件

Question

我必须授权我的服务器到Firebase以获得Firebase SDK。但不幸的是，我无法读取credentials.json文件。我已经将service.json文件放到了WEB-INF文件夹中。

我已经将其添加到我的appengine-web.xml文件中：

<resource-files>
    <include path="/service.json"/>
</resource-files>

我试着用下面的代码来读取文件：

FirebaseOptions options = new FirebaseOptions.Builder().setServiceAccount(ServletServletContext.class.getResourceAsStream("/WEB-INF/service.json"))

但当我尝试读取该文件时，我得到了一个NullPointerException。

这是我的整个班级：

@Api(
  name = "myApi",
version = "v1",
namespace = @ApiNamespace(
ownerDomain = "backend",
ownerName = "backend",
packagePath=""
  )
)
public class MyEndpoint {

private static final Logger log = Logger.getLogger(MyEndpoint.class.getName());
private String uid;

@ApiMethod(name = "signup")
public MyBean signup(@Named("token")String token)
{
    uid = "empty";
    uid = "init";

    log.info(new File(getClass().getResource("/WEB-INF/service.json").toString()).exists()+"");

    FirebaseOptions options = new FirebaseOptions.Builder()
                .setServiceAccount(getClass().getResourceAsStream("/WEB-INF/service.json"))
                .setDatabaseUrl("url")
                .build();

    FirebaseApp.initializeApp(options);
    uid = "initialized";

    log.severe("initialized");
    FirebaseAuth.getInstance().verifyIdToken(token)
            .addOnSuccessListener(new OnSuccessListener<FirebaseToken>() {

                    @Override
                    public void onSuccess(FirebaseToken decodedToken) {uid = decodedToken.getUid();
                    }
            });

    MyBean b = new MyBean();
    if(!uid.equals(""))
        b.setData(uid);
    // else
    // b.setData("failed");

    return b;
}

}

提前感谢您的帮助。

Answer 1

您可以使用

this.getClass().getResourceAsStream("/WEB-INF/service.json");