GraphicImage和StreamedContent顯示數據庫中的動態圖像我正在嘗試顯示圖像字節，這些字節保存在數據庫中，作為StreamedContent在<p:graphicImage>詳情如下：<p:graphicImage value="#{item.imageF}" width="50" id="grpImage" height="80"/>private StreamedContent content; // getter and setterpublic StreamedContent getImageF() {
if (student.getImage() != null) {
InputStream is = new ByteArrayInputStream(student.getImage());
System.out.println("Byte :"+student.getImage());
content = new DefaultStreamedContent(is, "", student.getStuID());
System.out.println("ddd ------------------------------- " + content);
return content;
}
return content;}這將返回一個空白圖像。這是如何造成的，我如何解決呢？標準輸出如下：INFO: Byte :[B@a2fb48
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@b0887bINFO: Byte :[B@a2fb48
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@1d06a92INFO: Byte :[B@d52f0b
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@39a60INFO: Byte :[B@d52f0b
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@8c3daaINFO: Byte :[B@124728a
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@1dbe05bINFO: Byte :[B@124728a
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@66a266INFO: Byte :[B@a2fb48
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@1293976INFO: Byte :[B@a2fb48
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@17b7399INFO: Byte :[B@d52f0b
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@1e245a5INFO: Byte :[B@d52f0b
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@4a7153INFO: Byte :[B@124728a
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@1561bfdINFO: Byte :[B@124728a
GraphicImage和StreamedContent顯示數據庫中的動態圖像
慕無忌1623718
2019-06-05 10:39:21
