import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; @WebServlet("/HighLight") public class HighLight extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType( "text/html; charset=UTF-8"); PrintWriter out = response.getWriter(); out.println("

");
    // 適当な Java のソースファイル
    // （例えば HighLight.java のコピー）
    // を WEB アプリのルートフォルダに Tekito.txt 
    // という名前で置いておくこと
    File f = new File(getServletContext()
                      .getRealPath("/Tekito.txt"));
    String word = request.getQueryString();
    InputStreamReader fr = new InputStreamReader
            (new FileInputStream(f), "UTF-8");
    BufferedReader in = new BufferedReader(fr);

    while(true) {
      String line = in.readLine();
      if (line == null) break;
      line = line.replace("&", "&");
      line = line.replace("<", "<");
      line = line.replace(">", ">");

      if (word != null && word.length() != 0) {
        line = line.replace(word, 
          "" + word + "");
      } 
      out.println(line);
    }
    out.println("

"); out.close(); in.close(); } }