将图像保存到 Google App Engine/Java 时出错

发布于 2024-08-10 17:42:50 字数 1431 浏览 5 评论 0原文

我正在尝试在 GAE/J 中创建以下 JDO 实体（我正在使用 Gilead ）。

package test.domains;

import java.io.Serializable;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import net.sf.gilead.pojo.java5.LightEntity;

import com.google.appengine.api.datastore.Blob;
import com.google.appengine.api.datastore.Key;


@PersistenceCapable(identityType=IdentityType.APPLICATION, detachable="true")
public class Banner extends LightEntity implements Serializable
{
 private static final long serialVersionUID = 1058354709157710766L;

 // Fields
 @PrimaryKey
 @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
 private Key id;

 @Persistent
 private String name;

 @Persistent
 private String sizeX;

 @Persistent
 private String sizeY;

 @Persistent
 private String description;

 @Persistent
 private Blob img;

 // Getters and Setters
}

并遇到以下问题：

[错误]第 40 行：没有源代码可用于类型 com.google.appengine.api.datastore.Blob；你是否忘记继承一个必需的模块？

什么会导致这个问题？代码在没有 Blob 对象的情况下编译良好。顺便说一句，我尝试遵循这个示例。

原文

I'm trying to make following JDO entity in GAE/J (I'm using Gilead).

package test.domains;

import java.io.Serializable;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import net.sf.gilead.pojo.java5.LightEntity;

import com.google.appengine.api.datastore.Blob;
import com.google.appengine.api.datastore.Key;


@PersistenceCapable(identityType=IdentityType.APPLICATION, detachable="true")
public class Banner extends LightEntity implements Serializable
{
 private static final long serialVersionUID = 1058354709157710766L;

 // Fields
 @PrimaryKey
 @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
 private Key id;

 @Persistent
 private String name;

 @Persistent
 private String sizeX;

 @Persistent
 private String sizeY;

 @Persistent
 private String description;

 @Persistent
 private Blob img;

 // Getters and Setters
}

And encountering following problem: