用Thymeleaf显示Base64String图像

Question

我将jpg图像存储在数据库中(作为字节数组).我想避免在显示在网页上之前删除文件系统.

单元测试表明数据库存储和检索工作没有损坏.可以从数据库中提取Fies并将其转换回jpg文件

图像已转换为bytearray并使用以下代码存储在数据库中:

public static byte[] getImageAsBytes(BufferedImage buffer) throws IOException
{
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(buffer, "jpg", baos);
    baos.flush();
    byte[] imageInByte = baos.toByteArray();
    baos.close();
    return imageInByte;

}

我有一个ViewWrapperMediaImage类,它包含从数据库中检索的字节数组.该类还有一个将bytearray转换为base64 String的方法.

package jake.prototype2.controller.viewwrapper;

import org.apache.commons.codec.binary.Base64;

import jake.prototype2.model.assessment.MediaImage;
import jake.prototype2.model.assessment.TestStructureException;
import jake.prototype2.model.structure.InterfacePersistenceBean;

public class ViewWrapperMediaImageCreate extends ViewWrapperTestContentElementCreate
{

private byte[] image;

protected String mediaFileName;

private static final long serialVersionUID = 4181515305837289526L;

public ViewWrapperMediaImageCreate(InterfacePersistenceBean persistenceBean) throws TestStructureException
{
    ....
    }
}

public byte[] getImage()
{
    return image;
}

public String generateBase64Image()
{
    return Base64.encodeBase64URLSafeString(this.getImage());
}

public void setImage(byte[] image)
{
    this.image = image;
}

public String getMediaFileName()
{
    return mediaFileName;
}

public void setMediaFileName(String mediaFileName)
{
    this.mediaFileName = mediaFileName;
}
}

我的Thymeleaf磁贴然后调用转换方法generateBase64Image():

<img  th:src="@{'data:image/jpeg;base64,'+${vwNewTestContentElement.generateBase64Image()}}" />

它不起作用.

生成的html源代码如下:

<IMG SRC ="数据:图像/ JPEG; BASE64,_9j_4AAQSkZJRgABAgAAAQABAAD_2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL_2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL_wAARCADhASwDASIAAhEBAxEB_8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL_8QAtRAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4-Tl5ufo6erx8vP09fb3 -....

任何提示都将深受赞赏

Answer 1

好吧,事实证明这很容易,我在问2分钟后解决了问题,但我敢打赌其他人会有同样的问题.

答案是不要使用URLSafe

它适用于 encodeBase64String()