无法在 gwt google 数据存储中获取图像数据 - 图像被拉伸

发布于 2024-08-17 01:28:29 字数 1318 浏览 5 评论 0原文

我有一个类，在其中声明了一个序列化类来存储图像数据

@Persistent(序列化=“true”)
私有可下载文件 imageLogoFile；

类的实现

public class DownloadableFile implements Serializable {

public DownloadableFile(byte[] content, String filename, String mimeType) { 极好的（）; this.内容=内容； this.文件名=文件名； this.mimeType = mimeType; } 私有静态最终长serialVersionUID = -8497358622042084708L; 私有字节[]内容；私有字符串文件名；私有字符串 mimeType；公共下载文件（）{ } showlogo

是一个 servlet，它应该从数据存储区获取内容，但它的所有调用都返回 null，而 blob 在 appwrench 中可见。

预期影响图像数据的位置

final Image logoImage = new Image();
logoImage.setUrl("/showlogo");
logoImage.setHeight("100px");
logoImage.setWidth("100px");

编辑：现在正在保存和获取图像数据，但图像被拉伸。我尝试过给出高度/宽度等，

Servlet 代码：

com.sms.DownloadableFile df = w.getImageLogoFile();
if (df != null){
    String filen = df.getFilename();
    response.setHeader("Content-Disposition", "filename="+filen);
    String mime = df.getMimeType();
    response.setContentType(mime);
    byte[] b = df.getContent();
    //Base64.encode(b);
    response.setContentLength(b.length);
    ServletOutputStream out = response.getOutputStream();
    out.write(b);
    // Pipe data here
    out.flush();
    out.close();
}

原文

I have a class in which I have decrlared a serialized class to store image data

@Persistent(serialized = "true")
private DownloadableFile imageLogoFile;

Implementation of the class

public class DownloadableFile implements Serializable {

public DownloadableFile(byte[] content, String filename, String mimeType) {
super();
this.content = content;
this.filename = filename;
this.mimeType = mimeType;
}
private static final long serialVersionUID = -8497358622042084708L;
private byte[] content;
private String filename;
private String mimeType;
public DownloadableFile() {
}
}

showlogo is a servlet that is supposed to fetch content from datastore but all its call are returning null whereas the blob is visible in appwrench.

Place where its expected to fecth the image data

final Image logoImage = new Image();
logoImage.setUrl("/showlogo");
logoImage.setHeight("100px");
logoImage.setWidth("100px");

Edit :
Now the image data is getting saved and fetched but the image is stretched out. I have tried giving height/width etc.,

Servlet code :

com.sms.DownloadableFile df = w.getImageLogoFile();
if (df != null){
    String filen = df.getFilename();
    response.setHeader("Content-Disposition", "filename="+filen);
    String mime = df.getMimeType();
    response.setContentType(mime);
    byte[] b = df.getContent();
    //Base64.encode(b);
    response.setContentLength(b.length);
    ServletOutputStream out = response.getOutputStream();
    out.write(b);
    // Pipe data here
    out.flush();
    out.close();
}

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