Question

In: Computer Science

I kept getting errors trying to make this code to work, can someone show me what...

I kept getting errors trying to make this code to work, can someone show me what i am doing wrong?

import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.annotation.*;

import java.io.*;

import java.util.*;

import java.nio.file.*;

import java.nio.charset.*;

import java.util.*;

//@WebServlet(name = "Assignment3_1", urlPatterns = { "/ReadFile" })
public class ReadFile extends HttpServlet{
static Charset myCharset = Charset.forName("US-ASCII");

@Override public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{

response.setContentType("text/html");

PrintWriter printer = response.getWriter();
out.println("<html>");

out.println("<head>");

out.println("<title>");

out.println("Assignment 5.1");

out.println("</title>");

out.println("<h1>Is Bitcoin money?</h1>");

out.println("</head>");

out.println("<body>");

out.println("<div>");

writeAndReadFile(printer);

out.println("</div>");

out.println("</body>");

out.println("</html>");

}
private synchronized void writeAndReadFile(PrintWriter out){
try{

Path file = Paths.gets("C:/Temp/servlet1.dat");
List <String> linesReads = null;
// Read every line in the .dat file.

linesRead = Files.readAllLine(file, myCharset);
if(linesRead is null){
for(String line : linesRead){
out.println(line + "<br />\n");

}

catch(IOException e)

{
out.println("ERROR* >> "); out.println(e.toString());
}

}

Expert Solution

/* WRONG STATEMENT IN YOUR CODE WAS */

wrong: PrintWriter printer = response.getWriter();

correct: PrintWriter out = response.getWriter(); // since you use out for println statement

wrong: writeAndReadFile(printer);

correct: writeAndReadFile(out);//PASS OUT

wrong: Path file = Paths.gets("C:/Temp/servlet1.dat");

correct : Path file = Paths.get("C:/Temp/servlet1.dat");//get is method

wrong: linesRead = Files.readAllLine(file, myCharset);

correct: linesReads = Files.readAllLine(file, myCharset); // since you create variable linesReads

if(linesReads == null){
for(String line : linesReads){
out.println(line + "<br />\n");

/* Match your code from Screenshot */

/* OUTPUT */

/* SINCE I HAVE NO FILE SERVER1.DAT */

/* PLEASE UPVOTE */

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