Question

jsf <aj4>中outputmedia显示图片的问题

请问下如何在a4j outputmedia中显示一个已经存在bufferedimage
谢谢

Answer 1

<a4j:mediaOutput element="img" mimeType="image/jpeg"
createContent="#{fileUploadBean.paint}"
style="width:100px; height:100px;" cacheable="false">

</a4j:mediaOutput>

public void paint(OutputStream out,Object object)
{
try
{
//必须有网线
URL url = new URL("http://i1.sinaimg.cn/ty/s/2009-06-17/1245182714_oYaPWI.jpg");

URLConnection conn = url.openConnection();

Image image = ImageIO.read(conn.getInputStream());

System.out.println(image);

//InputStream is = new FileInputStream(this.fileAddress("苹果"));

//Image image = ImageIO.read(is);

int width = image.getWidth(null);

int height = image.getHeight(null);

BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

bi.getGraphics().drawImage(image, 0, 0, width, height,null,null);

ImageIO.write((RenderedImage) image, "jpg", out);

}
catch(FileNotFoundException e)
{
e.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}
}