Question

我有一张excel表。使用它的信息我必须得到一些细节并将它存储在一个mysql表中。

我的代码是：

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@page import="java.io.IOException"%>
<%@page import="java.sql.SQLException"%>
<%@page import="cnn.sem_year_conversion"%>
<%@page import="org.apache.poi.ss.usermodel.Row"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFCell"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFRow"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFSheet"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFWorkbook"%>
<%@page import="org.apache.poi.poifs.filesystem.POIFSFileSystem"%>
<%@page import="java.util.Iterator"%>
<%@page import="java.io.FileInputStream"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.Connection"%>
<%@page import="cnn.cn"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>

 <%  
     try
     {
 Connection con=cn.getcon();  
 PreparedStatement ps=null;  

  String name,f_name,branch="",enroll,status="regular",sem,elligible="";
 int year= 0;
 int flag;
 int count=0;
         con.setAutoCommit(false);
        PreparedStatement pstm = null ;
        FileInputStream input = new FileInputStream("C:/Users/intel/Documents/student_excel.xls");
        POIFSFileSystem fs = new POIFSFileSystem( input ); //creating a new poi reference to the given excel file
        HSSFWorkbook wb = new HSSFWorkbook(fs);
        HSSFSheet sheet = wb.getSheetAt(0);
        Row row;
                 for(int i=1; i<=sheet.getLastRowNum(); i++)
                 { 
                     //points to the starting of excel i.e excel first row
           row = (Row) sheet.getRow(i);  //sheet number
                              if( row.getCell(1)==null) { enroll = "0";}  //suppose excel cell is empty then its set to 0 the variable
                   else enroll = row.getCell(1).toString();   //else copies cell data to name variable

                                  if( row.getCell(2)==null) { name = "0";}  //suppose excel cell is empty then its set to 0 the variable
                   else name = row.getCell(2).toString();   //else copies cell data to name variable

                                      if( row.getCell(3)==null) { f_name = "0";}  //suppose excel cell is empty then its set to 0 the variable
                   else f_name = row.getCell(3).toString();   //else copies cell data to name variable

    if( row.getCell(5)==null) { sem = "0";}  //suppose excel cell is empty then its set to 0 the variable
                   else sem = row.getCell(5).toString();   //else copies cell data to name variable

                switch (sem) {
            case "1":
            case "2":
                year=1;
                break;
            case "3":
            case "4":
                year=2;
                break;
            case "5":
            case "6":
                year=3;
                break;
            case "7":
            case "8":   
                year=4;
                break;
                default:year=0;
        }

      if( row.getCell(6)==null) { elligible="0";}  //suppose excel cell is empty then its set to 0 the variable
                   else elligible = row.getCell(6).toString();   //else copies cell data to elligible variable
if(elligible=="Submitted to RGPV"|| elligible=="Forwarded by RGPV" )
    flag=0;
else
    flag=1;
   if(enroll.contains("AU"))
       branch="au";
   else if(enroll.contains("EC"))
       branch="ec";
   else if(enroll.contains("CS"))
       branch="cs";
   else if(enroll.contains("CE"))
       branch="ce";
   else if(enroll.contains("IT"))
       branch="it";


 String query="insert into student values(?,?,0,3,?,?,?)";  
 ps=con.prepareStatement(query); 
 ps.setString(1, enroll);
 ps.setString(2, name);
 ps.setString(3, branch);
 ps.setInt(4,year);
 ps.setString(5, f_name);
 ps.setString(6, status);


 count=ps.executeUpdate();

                 }


 //For checking data is inserted or not?  

          con.commit();
        pstm.close();
        con.close();
        input.close();
        if(count>0)
        System.out.println("Successful import of excel to mysql table");

        else
          System.out.println("Import Failed.");

    }

     catch(SQLException ex){
       out.println(ex);
    }catch(IOException ioe)`{
       out.println(ioe);
    }


%>

    </body>
</html>

但它产生了以下错误---

HTTP Status 500 - Internal Server Error

type Exception report

messageInternal Server Error

descriptionThe server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: PWC6033: Error in Javac compilation for JSP

PWC6199: Generated servlet error:
source value 1.5 is obsolete and will be removed in a future release

PWC6199: Generated servlet error:
target value 1.5 is obsolete and will be removed in a future release

PWC6199: Generated servlet error:
To suppress warnings about obsolete options, use -Xlint:-options.

PWC6197: An error occurred at line: 32 in the jsp file: /student_info.jsp
PWC6199: Generated servlet error:
strings in switch are not supported in -source 1.5
  (use -source 7 or higher to enable strings in switch)

note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 4.0 logs.
GlassFish Server Open Source Edition 4.0

我在switch case中使用了String，因为在使用int时它给出了异常 -

org.apache.jasper.JasperException: java.lang.NumberFormatException: For input string: "1.0"

如何解决这个问题？

Answer 1

我认为它应该是switch语句的例外，因为A switch使用byte，short，char和int原始数据类型。

尝试在切换之前先将数据转换为整数。

将数据从excel导出到mysql

1 个答案: