java - Facing: The method readLine() is undefined for the type String -


enter image description herei have java program named p_builder.java.

import java.io.*;     import javax.servlet.*;     import javax.servlet.http.*;     import java.lang.*;     import java.text.*;     import java.util.*;      public class p_builder {            public string pb_reader( string file_location, string pb_cmd)throws ioexception         {              file file=new file(file_location);              processbuilder pb = new processbuilder("cmd","/c",pb_cmd);              pb.directory(file);              process p = pb.start();              bufferedreader reader = new bufferedreader(new inputstreamreader(                     p.getinputstream()));              string readline= reader.tostring();             return readline;             /*string readline=null;             do{             return readline;             }while((readline = reader.readline()) != null);*/         }        } 

now using p_builder.java in a.jsp multiples times since need run process builder multiple times.

i want line wise output of p_builder sent a.jsp can read line wise output using readline() method , print output using a.jsp have omit few lines in output.

a.jsp

<%@ page import="java.io.*"%> <%@ page import="javax.servlet.*"%> <%@ page import="javax.servlet.http.*"%> <%@ page import="java.text.decimalformat"%> <%@ page import="license_dashboard.p_builder" %> string pcm= "lmutil.exe lmstat -a -c 426@stiosp569"; p_builder p1=new p_builder(); string readline1=p1.pb_reader("d:\\singula\\log", pcm);   string readline; int j=0; while ((readline = readline1.readline()) != null) {     if(j==2 || j==3 || j==6)     {     //out.println(readline);     //out.println("<br>");     }     else if(j>9)     {     out.println(readline);     out.println("<br>");     }     else     {     //out.println("<br>");     }     j++;     } 

after facing error:- "the method readline() undefined type string" in a.jspin while loop.

update:- 5:23pm

import java.io.*;         import javax.servlet.*;         import javax.servlet.http.*;         import java.lang.*;         import java.text.*;         import java.util.*;          public class p_builder {                public string pb_reader( string file_location, string pb_cmd)throws ioexception             {                  file file=new file(file_location);                  processbuilder pb = new processbuilder("cmd","/c",pb_cmd);                  pb.directory(file);                  process p = pb.start();                  bufferedreader reader = new bufferedreader(new inputstreamreader(                         p.getinputstream()));                   return reader;                 //string readline= reader.tostring();                 //return readline;                  /*string readline=null;                 do{                 return readline;                 }while((readline = reader.readline()) != null);*/             }           } 

even gives error since needs return string type. how can make return type bufferedreader since want return multiple values read bufferedreader.

after can tell how can catch values in jsp , print them on webpage.

update:- 7:00pm

 public class p_builder {                public string pb_reader( string file_location, string pb_cmd)throws ioexception             {                  file file=new file(file_location);                  processbuilder pb = new processbuilder("cmd","/c",pb_cmd);                  pb.directory(file);                  process p = pb.start();                  bufferedreader reader = new bufferedreader(new inputstreamreader(                         p.getinputstream()));                 stringbuffer result=new stringbuffer();                 string readline;          while((readline = reader.readline()) != null)         {               //this.fin_readline[j]=readline+"\n";             result.append(readline);             result.append("\n");           }             }             return result.tostring();           } 

now a.jsp has been modififed:-

<%      out.println("\n");     try{     p_builder p1=new test_p_builder();     string pcm= "lmutil.exe lmstat -a -c 426@stiosp569";      string res=p1.b_reader("d:\\singula\\log", pcm);      string[] lines = res.tostring().split("\\n");     int j=0;     for(string readline:lines)     {         if(j>3)     {     out.println(readline);     }     j++;     }     }     catch(exception e)     {         out.println(e);     } 

%>

now output not coming aligned. screen print attached.enter image description here

would appreciate resolution output aligned?

output after giving out.println(readline + "
"); in jsp

your pb_reader method needs return bufferedreader not string.

string readline= reader.tostring(); reason decide string representation of reader. don't that.


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