Question

我正在尝试在本地驱动器的jsp上显示图像。我在imp中将img src设置为src = "../../../ImageServlet"，但我得到了一个

java.lang.IllegalStateException 
    at org.apache.jasper.runtime.ServletResponseWrapperInclude.getOutputStream(ServletResponseWrapperInclude.java:63) 
    at DisplayImageServlet.doPost(ImageServlet.java:95)
    at DisplayImageServlet.doGet(ImageServlet.java:34)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

异常。

我的Servlet代码是：

protected void doPost(HttpServletRequest request,HttpServletResponse response)    throws   ServletException, IOException {
String applicationNumber = (String)session.getAttribute("APPLICATIONNUMBER");
File file = new File("C:/photos/"+applicationNumber+".jpg");

        response.setContentType(getServletContext().getMimeType(file.getName()));
        response.setHeader("Content-Length", String.valueOf(file.length()));
        response.setHeader("Content-Disposition", "inline; filename=\"" + file.getName() + "\"");

        BufferedInputStream input = null;
        BufferedOutputStream output = null;

        try {
            input = new BufferedInputStream(new FileInputStream(file));
            output = new BufferedOutputStream(response.getOutputStream());

            byte[] buffer = new byte[10240];
            int length;
            while ((length = input.read(buffer)) > 0) {
                output.write(buffer, 0, length);
            }
        } finally {
            if (output != null) try { output.close(); } catch (IOException logOrIgnore) {}
            if (input != null) try { input.close(); } catch (IOException logOrIgnore) {}
        }
    }
    catch(Exception ex){
        ex.printStackTrace();
    }
}

和我的jsp img标签就像 -

<div>
                <div>
                  <label>Photo </label>
                  <div>
                    <div style="width:194px;height:162px;"><img src="../../../ImageServlet" id="Image" style="width:100px;height:100px;" /></div>
                    <div style="margin-left:115px; margin-top:10px;">
                      <input  name="filename" type="file" id="filename"/>
                    </div>
                  </div>
                </div>

请帮帮我，还是有其他方法可以做同样的事。感谢。

Answer 1

@ user3035077尝试以下代码..

try {
      HttpSession session=request.getSession();
      String applicationNumber = (String)session.getAttribute("APPREFNUMBER");
      File file = new File("C:/photos/"+applicationNumber+".jpg");
      if (file.exists()) {
         BufferedInputStream in = new BufferedInputStream(
                                new FileInputStream(file));

         // Get image contents.
        byte[] bytes = new byte[in.available()];
        in.read(bytes);
        in.close();
         // Write image contents to response.
        response.getOutputStream().write(bytes);
          }
} catch (IOException e) {
        e.printStackTrace();
    }

如果这有帮助，请告诉我......

在输出上获取java.lang.IllegalStateException = new BufferedOutputStream（response.getOutputStream（））

1 个答案: