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
我希望您正在处理文件上传 .
问题出在以下几行:
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here和here以及here