Spring - 在jsp文件上显示图像 [英] Spring - display image on jsp file

问题描述

我的模型商店图像用文件名（作为String）和数据（作为字节数组）描述。我使用Hibernate，这是我的模型：

my model store image described with file name (as String) and data (as byte array). I use Hibernate and here's my model:

@Entity
public class Image {

    private Long id;
    private String name;
    private byte[] data;

    @Id
    @GeneratedValue
    @Column(name = "IMAGE_ID")
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Column(nullable = false, length = 100)
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Lob
    @Column(nullable = false)
    public byte[] getData() {
        return data;
    }

    public void setData(byte[] data) {
        this.data = data;
    }
}

但我想在网上显示我存储的图像网站如：

But I want to display my stored image, on web site like:

<img src="${image.data}" alt="car_image"/>

我怎么能这样做？

我应该编写服务器请求图像吗？

Should I write controller that serve requests for images?

任何代码示例？

UPDATE

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.tiles2.TilesView" />
</bean>

<bean id="tilesConfigurer"
    class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
    <property name="definitions">
        <list>
            <value>/WEB-INF/configs/tiles.xml</value>
        </list>
    </property>
</bean>

推荐答案

你不能这样做。您的图片必须通过普通网址以某种方式曝光。在Spring MVC中创建一个控制器，在特定的URL下返回一个图像（原始数据）：

You cannot do it like this. Your image must be exposed somehow via normal URL. In Spring MVC create a controller that returns an image (raw data) under particular URL:

@RequestMapping(value = "/imageController/{imageId}")
@ResponseBody
public byte[] helloWorld(@PathVariable long imageId)  {
  Image image = //obtain Image instance by id somehow from DAO/Hibernate
  return image.getData();
}

现在在JSP页面中使用。这就是HTTP / HTML的工作原理：

Now useit in your JSP page. This is how HTTP/HTML work:

<img src="/yourApp/imageController/42.png" alt="car_image"/>

在3.1之前的Spring MVC中，您可能需要在控制器端进行更多编码。但原则是一样的。

In Spring MVC before 3.1 you might need to do a little bit more coding on controller side. But the principle is the same.

这篇关于Spring - 在jsp文件上显示图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！