Question

我已在亚马逊war上传了我的ec2-instance文件和数据库。并试图在jsp页面上显示来自tomcat7 webapps的图像。我在图片/webapps/images/中设置路径src以动态显示图片。

当我点击上传图片时。在路径中上传的图像保存在数据库中。我从数据库中获取了图像路径。图像没有显示出来。

请帮我解决这个问题.....

修改

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            if(!ServletFileUpload.isMultipartContent(request)){
        throw new ServletException("Content type is not multipart/form-data");
    }
    List<UploadBean> list = new ArrayList<UploadBean>();

    int  count=0;
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    try {
        @SuppressWarnings("unchecked")
        List<FileItem> fileItemsList = uploader.parseRequest(request);
        Iterator<FileItem> fileItemsIterator = fileItemsList.iterator();
        while(fileItemsIterator.hasNext()){
            FileItem fileItem = fileItemsIterator.next();
            System.out.println("FieldName="+fileItem.getFieldName());
            System.out.println("FileName="+fileItem.getName());
            System.out.println("ContentType="+fileItem.getContentType());
            System.out.println("Size in bytes="+fileItem.getSize());
            File file = new File(request.getServletContext().getAttribute("FILES_DIR")+File.separator+fileItem.getName());
            System.out.println("Absolute Path at server="+file.getAbsolutePath());
           fileItem.write(file);
           SelectImageClass select = new SelectImageClass();
           insertTempExp(fileItem.getName());
           list= select.getUploadedImage();
           request.setAttribute("serv", list);
           request.getRequestDispatcher("/test.jsp").forward(
           request, response);
        }
    } catch (FileUploadException e) {
        out.write("Exception in uploading file.");
    } catch (Exception e) {
        e.printStackTrace();
    }

}

Answer 1

显示您的jsp和java文件，以查找您用于访问图像的路径服务器

只需使用它来上传路径

    String rootPath=request.getSession().getServletContext().getRealPath("/");
    String relativePath="images";  //folder name to save images
    File file = new File(rootPath + File.separator + relativePath);
    if(!file.exists()){ file.mkdirs();}

    ctx.setAttribute("FILES_DIR_FILE", file);
    ctx.setAttribute("FILES_DIR", rootPath + File.separator + relativePath);

并使用jsp显示图像 <image src="images/image_name">

Answer 2

public class FileLocationContextListener implements ServletContextListener {

    public void contextInitialized(ServletContextEvent servletContextEvent) {
        String rootPath = System.getProperty("catalina.home");
        ServletContext ctx = servletContextEvent.getServletContext();
        String relativePath = ctx.getInitParameter("/webapps/CovetloFiles.dir");

        File file = new File(rootPath + File.separator + relativePath);
        if(!file.exists()){ file.mkdirs();}
        if(!file1.exists()){ file1.mkdirs();}

        System.out.println("File Directory created to be used for storing files");
        ctx.setAttribute("FILES_DIR_FILE", file);
        ctx.setAttribute("FILES_DIR", rootPath + File.separator + relativePath);
    }

<%
ArrayList<UploadBean> list = (ArrayList<UploadBean>) request.getAttribute("serv"); 
if(list!=null) {
  for(UploadBean upload : list) {
    strGet = upload.getUploadImage();   
%>
<img class="img-responsive" src="/CovetloFiles/<%=upload.getUploadImage()%>" name="imgUrl" alt="prod1">

Answer 3

上面使用servlet上下文我设置了上传图像的路径

下面我创建了java类，其中我从数据库中获取图像名称，只在上面路径上传的图像存储在数据库中的名称

我使用过：request.setAttribute（“serv”，list）; list包含数据库表中的所有名称

Answer 4

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            if(!ServletFileUpload.isMultipartContent(request)){
        throw new ServletException("Content type is not multipart/form-data");
    }
             List<UploadBean> list = new ArrayList<UploadBean>();
            //HttpSession session = request.getSession(true);
     int  count=0;
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    try {
        @SuppressWarnings("unchecked")
        List<FileItem> fileItemsList = uploader.parseRequest(request);
        Iterator<FileItem> fileItemsIterator = fileItemsList.iterator();
        while(fileItemsIterator.hasNext()){
            FileItem fileItem = fileItemsIterator.next();
            System.out.println("FieldName="+fileItem.getFieldName());
            System.out.println("FileName="+fileItem.getName());
            System.out.println("ContentType="+fileItem.getContentType());
            System.out.println("Size in bytes="+fileItem.getSize());


            File file = new File(request.getServletContext().getAttribute("FILES_DIR")+File.separator+fileItem.getName());
            System.out.println("Absolute Path at server="+file.getAbsolutePath());
           // out.write("<a href=\"UploadServlet?fileName="+fileItem.getName()+"\">Download <img src=/CovetloFiles/"+fileItem.getName()+"  width=100px height=100px></a>");

            fileItem.write(file);
            SelectImageClass select = new SelectImageClass();
           insertTempExp(fileItem.getName());
           list= select.getUploadedImage();
           request.setAttribute("serv", list);
       request.getRequestDispatcher("/test.jsp").forward(
            request, response); 

        }
    } catch (FileUploadException e) {
        out.write("Exception in uploading file.");
    } catch (Exception e) {
        e.printStackTrace();
    }

}

无法使用Amazon ec2-instance显示来自tomcat7 webapps的上传图像

4 个答案: