Java 如何在JSP中显示数据库中的图像?
我在显示数据库中的图像时遇到一些问题 物品类别Java 如何在JSP中显示数据库中的图像?,java,spring,jsp,spring-mvc,spring-data-jpa,Java,Spring,Jsp,Spring Mvc,Spring Data Jpa,我在显示数据库中的图像时遇到一些问题 物品类别 @Entity @Table(name = "cmr_article", indexes = { @Index(columnList = "name", unique = true) }) public class Article { public static final int NAME_MAX = 50; public static final int DESCRIPTION_MAX = 100; public static fina
@Entity
@Table(name = "cmr_article", indexes = { @Index(columnList = "name", unique = true) })
public class Article {
public static final int NAME_MAX = 50;
public static final int DESCRIPTION_MAX = 100;
public static final int FULL_MAX = 500;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
@Column(nullable = false, length = NAME_MAX)
private String name;
@Column(nullable = false, length = DESCRIPTION_MAX)
private String description;
@Lob
@Column(nullable = false, length = FULL_MAX)
private String full;
@Column(nullable = false)
private String date;
@Column(nullable = false)
private byte[] data;
@ManyToOne
private User user;
除此之外:
@Transactional(propagation=Propagation.REQUIRED, readOnly=false)
public void articleSave2(long userId, ArticleForm articleForm) {
User user = userRepository.findOne(userId);
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm");
Date date = new Date();
Article article = new Article();
article.setName(articleForm.getName());
article.setDescription(articleForm.getDescription());
article.setDate(dateFormat.format(date));
article.setFull(articleForm.getFull());
article.setData(articleForm.getData());
article.setUser(user);
articleRepository.save(article);
}
jps文件:
<img src='<c:out value="${article.data}"></c:out>' />
”/>
问题是JSP文件中的图像没有显示,它显示代码:
[B@6acdfc86
。在MYSQL中,我看到我保存了图像。如何更改代码以在我的jsp中查看图像?使用原始字节数组和jsp EL无法完成您要做的事情。您需要将图像嵌入为,或者需要将图像保存到磁盘的某个位置,并在src
属性中提供一个URL来访问它。使用原始字节数组和JSP EL无法完成您想要完成的任务。您需要将图像嵌入为,或者需要将图像保存到磁盘的某个位置,并在src
属性中提供一个URL来访问它