Hibernate在SqlServer中显示图像

最新推荐文章于 2024-04-18 15:57:27 发布

原创最新推荐文章于 2024-04-18 15:57:27 发布 · 101 阅读

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#Hibernate #JSP

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本文介绍了一种通过JSP页面展示数据库中图片的方法，利用Struts2框架的stream结果类型直接将图片数据输出到浏览器。该方案涉及从数据库读取图片数据、设置HTTP响应头以及配置Struts2的Action。

1、jsp部分

 <img src="retrievePhotoAction.action?id=${photo.id}">

2、action部分

	@Autowired(required = true) @Qualifier("productManager")
	private ProductManager productManager;
	
	private Integer id;
	
	private InputStream targetFile;
    public InputStream getTargetFile(){    	
    	return  this.targetFile;
    }
    
    
    public void setId(Integer id) {
		this.id = id;
	}


	@Action(value="retrievePhotoAction",results={
    		@Result(type="stream",name="success",params={
    		"inputName","targetFile","contentDisposition","attachment;filename=fileName",
    		"contentCharSet","UTF-8","bufferSize","4096"})
    	})
    		
	public String execute() throws Exception {
    	this.targetFile = productManager.retrievePhotoToFile(id);
    	return "success";

3、service部分

    	Session session = this.sessionFactory.getCurrentSession();
    	Photo ph = (Photo)session.load(Photo.class, photoId);    	
		Blob image = ph.getImage();
		
		HttpServletResponse response = ServletActionContext.getResponse();
		response.setHeader("contentType", ph.getContentType());
		
		InputStream is=null, result=null;
		try {
			is = image.getBinaryStream();
			ByteArrayOutputStream baos = new ByteArrayOutputStream();		
			byte[] buf = new byte[102400];
			int len;
			
			while((len=is.read(buf))!=-1){
			     baos.write(buf,0,len);
			}
			is.close();
			baos.close();
			byte[] ba = baos.toByteArray();
			
			result = (InputStream) new ByteArrayInputStream(ba);
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return result;