replace single char \ to double char \\ in path

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I am browsing a file on a jsp page and sending this file address to second jsp page, on second jsp page i am receiving this file path as a string the code is given below.

HTML

<%
String st=request.getParameter("mptest");
String rst=  request.getRealPath(st); 

\\here in rst i am geting a path as c:\vishal\ragh.xls and i wish to replace \ with \\ . Hence i used replace method for it the way given below

rst = rst.replace("\","\\"); 

\\but netbeans id showing an error that "illigal scape character" . Is there any other way so that
i could do my job.Please anyone help me.
    
%>

Posted 15-Aug-13 19:42pm

Member 9654958

Updated 15-Aug-13 22:10pm

Maciej Los

v2

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Abhinav S · Answer 1 · 2013-08-15T22:32:00

Solution 1

Try
rst = rst.replace("\\","\\\\");

This[^] may help you.

[edit]four \es in the replacement string.[/edit]

Posted 15-Aug-13 22:32pm

Abhinav S

Updated 15-Aug-13 22:50pm

v2

Comments

Maciej Los 16-Aug-13 6:16am

Short and to the point!
+5!

Abhinav S 16-Aug-13 22:04pm

Thank you.

Member 9654958 · Answer 2 · 2013-08-16T19:51:00

it doesn't solve my problem...... when i used it , it remove the error but didn't give desired output my copmlete code is given below

XML

<%@page import="org.apache.poi.ss.usermodel.Cell"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<%@page import="java.util.regex.Matcher"%>
<%@page import="java.util.*"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFSheet"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFWorkbook"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFRow"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFCell"%>
<form  action="tab.jsp" method="get" enctype="multipart/form-data>
            <div align="left">
                <input type="file" name="F1" > <br>
                <input type="submit" name="send">

<table border="1">
<% String rst=null;
    try
    {
  String st=request.getParameter("mptest");
  String o= Matcher.quoteReplacement("'\'");
   rst=  request.getRealPath(st);
  rst = rst.replace("\\","\\\\");
    out.println(rst);}
    catch(Exception e)
   {e.printStackTrace();}

    int i=0;
    String  value1="";
    double value2=0;
    if(rst != null && !rst.equals(""))
    {
    try
    {
    FileInputStream fs =new FileInputStream(rst);
    HSSFWorkbook wb = new HSSFWorkbook(fs);
    for(int k = 0; k < wb.getNumberOfSheets(); k++)
    {
    int j=i+1;
    HSSFSheet sheet = wb.getSheetAt(k);
    int rows  = sheet.getPhysicalNumberOfRows();
    for(int r = 0; r < rows; r++)
    {
    HSSFRow row   = sheet.getRow(r);
    %>
    <tr>
    <%

    int cells = row.getPhysicalNumberOfCells();
    for(int ce = 0; ce < cells; ce++)
    {

    HSSFCell cell1  = row.getCell(ce);
    switch(cell1.getCellType())
    {
        case Cell.CELL_TYPE_STRING:
     value1 = cell1.getStringCellValue();
   %>
   <td><%=value1%></td>
   <%
   break;
    case Cell.CELL_TYPE_NUMERIC:
     value2 = cell1.getNumericCellValue();
   %>
   <td><%=value2%></td>
   <%
  break;
    }

    %>

    <%
    }
    %>
    </tr>
    <%
        i++;
    }
        }
    }
    catch(Exception e){
    System.out.println(e);
    }
    }
    %>
    </table>
</form>