首页 文章

java.io.FileNotFoundException :(没有这样的文件或目录) - 使用servlet

提问于
浏览
1

我正在使用hibernate和tomcat . 我所做的是创建一个具有文件输入的表单 . 在servlet中我想将该文件转换为byte [] . 但是当我想创建de File时,没有目录:它只保存图像的名称,而不是路径 . 这是错误:

java.io.FileNotFoundException:oldi.png(没有这样的文件或目录)在java.io.FileInputStream.open(本机方法)java.io.FileInputStream . (FileInputStream.java:138)at control.servlets.AddGenericItem . doPost(AddGenericItem.java:46)位于javax.servlet.http.HttpServlet.service(HttpServlet.java:647)的javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.apache.catalina.core .applicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)atg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)at at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:171)org.apache.ca上的org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) talina.valves.AccessLogValve.invoke(AccessLogValve.java:947)org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java: 408)org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:589)org.apache.tomcat.util.net .JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:310)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:615)at at java.lang.Thread.run(Thread.java:724)

HTML:

<tr>
    <td>
        <font class="text_title">Image: </font>
    </td>
    <td>
        <input name="image" type="file">
    </td>
</tr>

<tr>
    <td>
        <input type="submit" value="submit" name="ctl00$MainContent$RegisterUserWizard$CreateUserStepContainer$CreateButton"
               id="ctl00_MainContent_RegisterUserWizard_CreateUserStepContainer_CreateButton"
               style="border-width:0px;">
    </td>
</tr>

Servlet的:

public class AddGenericItem extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse)
            throws ServletException, IOException {

//        HttpSession session = httpServletRequest.getSession();
        DatabaseManager databaseManager = new DatabaseManager();

        String name = httpServletRequest.getParameter("name");
        String description = httpServletRequest.getParameter("description");
        float price = Float.parseFloat(httpServletRequest.getParameter("price"));

        File image = new File(httpServletRequest.getParameter("image"));
        byte[] imageArray = new byte[(int) image.length()];
        try {
            FileInputStream fileInputStream = new FileInputStream(image);
            fileInputStream.read(imageArray);
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        Admin admin = (Admin) httpServletRequest.getSession().getAttribute("user");
        Brand brand = admin.getBrand();

        GenericItem genericItem = new GenericItem(name, description, imageArray, price,brand);

        GenericItemDAO genericItemDAO = databaseManager.getGenericItemDAO();

        genericItemDAO.beginTransaction();
        genericItemDAO.save(genericItem);

        try {
            genericItemDAO.commitTransaction();
        } catch (DatabaseAccessFailException e) {
            e.getStackTrace();
        } finally {
            httpServletResponse.sendRedirect("/adminPages/items.jsp");
        }
    }

    @Override
    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse)
            throws ServletException, IOException {

    }

    @Override
    protected void doDelete(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse)
            throws ServletException, IOException {

    }

}

1 回答

  • 0

    我希望您正在处理文件上传 .

    问题出在以下几行:

    FileInputStream fileInputStream = new FileInputStream(image);
    

    Servlet在服务器上查找文件以读取它,但那时它不会存在 .


    使用Apache提供的Commons Fileupload library,可以轻松地为您的servlet和Web应用程序添加强大,高性能的文件上载功能 .

    查找完整代码herehere以及here

相关问题