java - 获取 HTTP 状态 404 - 502.shtml 请求的资源不可用。上传文件时

Question

我在使用我编写的 servlet 时遇到上述错误。 war 文件是在 cPanel 上安装的 Tomcat ver 7.0.39 上设置的。 servlet 在本地机器上编译测试没问题。我了解到有一个问题与 cPanel/PHP 配置有关。我尝试使用 cPanel 配置但没有成功我觉得它与 java 代码无关，但无论如何我都会放置 fileUploadServlet

编辑:我能够上传一个非常小的文件，所以它与文件大小\长处理时间有关

package servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.Part;

import convertor.TextAnalayzer;

import exception.ZoharException;

import beans.ParashaBean;
import beans.UserBean;

import jdbcHandler.JDBCZhoarHandler;

import util.ParashaName;
import util.XmlUrelParaser;

@WebServlet(urlPatterns = { "/upload" }, loadOnStartup = 1)
@MultipartConfig
public class FileUploadServlet extends HttpServlet {

    private static final long serialVersionUID = 8626646959046203428L;
    private JDBCZhoarHandler appHandler = new JDBCZhoarHandler();
    public static final String ERROR_PARAMETER = "error";
    public static final String COMMAND_PARAMETER = "command";
    public static final String USER_ATTRIBUTE = "user";
    public static final String HANDLER_ATTRIBUTE = "handler";

    @Override
    public void init() throws ServletException {
        super.init();
        try {
            getServletConfig().getServletContext().setAttribute("list",
                    appHandler.viewParashot());
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void service(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String command = request.getParameter(COMMAND_PARAMETER);
        String nextPage = "/login.jsp";
        if ("convert".equals(command)) {
            nextPage = this.upload(request, response);
        } else if ("login".equals(command)) {
            nextPage = this.login(request, response);
        } else {
        }// do nothing!!

        this.getServletConfig().getServletContext()
                .getRequestDispatcher(nextPage).forward(request, response);
    }

    private String login(HttpServletRequest request,
            HttpServletResponse response) {
        String name = request.getParameter("userName");
        String password = request.getParameter("password");
        JDBCZhoarHandler handler = new JDBCZhoarHandler();
        try {
            UserBean user = handler.getUser(name, password);
            HttpSession session = request.getSession(true);
            session.setAttribute(HANDLER_ATTRIBUTE, handler);
            session.setAttribute(USER_ATTRIBUTE, user.getId());
            return "/uploadFile.jsp";
        } catch (Exception e) {
            request.setAttribute(ERROR_PARAMETER, e.getMessage());
            return "/login.jsp";
        }

    }

    private String upload(HttpServletRequest request,
            HttpServletResponse response) {

        // view artifacts
        HttpSession session = request.getSession(false);
        ParashaName parashaName = new ParashaName();
        JDBCZhoarHandler handler = (JDBCZhoarHandler) session
                .getAttribute(HANDLER_ATTRIBUTE);
        List<ParashaBean> list = null;
        try {
            list = handler.viewParashot();
        } catch (SQLException e1) {
            request.setAttribute(ERROR_PARAMETER, e1.getMessage());
        }
        session.setAttribute("list", list);

        // Processing file
        if ("convert".equals(request.getParameter("command"))) {

            OutputStream out = null;
            InputStream filecontent = null;

            try {
                // Create path components to save the file
                XmlUrelParaser xml = new XmlUrelParaser();
                SimpleDateFormat format = new SimpleDateFormat(
                        "dd-MM-yy_HH-mm-ss");
                final Part filePart = request.getPart("file");
                if (filePart.getSize() == 0) {
                    throw new ZoharException("you must upload a file first");
                }
                final String fileName = xml.getUR("incomingFilesDir")
                        + session.getAttribute(USER_ATTRIBUTE)
                        + parashaName.convert(Integer.parseInt(request
                                .getParameter("parasha")))
                        + format.format(new Date()) + ".docx";

                out = new FileOutputStream(new File(fileName));
                filecontent = filePart.getInputStream();

                int read = 0;
                final byte[] bytes = new byte[1024];

                while ((read = filecontent.read(bytes)) != -1) {
                    out.write(bytes, 0, read);
                }
                TextAnalayzer ta = new TextAnalayzer();
                Integer ID = (Integer)session.getAttribute("user");
                ta.analayze(fileName,
                        Integer.parseInt(request.getParameter("parasha")),
                        Boolean.parseBoolean(request.getParameter("orginal")),
                        ID);
                request.setAttribute(ERROR_PARAMETER, "Upload complete");
                return "/uploadFile.jsp";
            } catch (Exception e) {
                request.setAttribute(ERROR_PARAMETER, e.getMessage());
            } finally {
                try {
                    if (out != null) {
                        out.close();
                    }
                    if (filecontent != null) {
                        filecontent.close();
                    }
                } catch (IOException e) {
                    request.setAttribute(ERROR_PARAMETER, e.getMessage());
                }
            }
        }
        return "/login.jsp";
    }
} 

Answer 1

这是内存力不足的结果。更好的内存管理代码解决了这个问题。