import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
public class Debug extends HttpServlet {
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException {
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("");
int len = request.getContentLength();
char[] buf = new char[len];
File f = new File(getServletContext().getRealPath("/Debug.out"));
PrintWriter fout = new PrintWriter(new FileWriter(f));
BufferedReader in = request.getReader();
in.read(buf);
in.close();
fout.print(buf);
fout.close();
out.printf("CONTENT_LENGTHは %dです。%n", len);
out.println("Debug.outに情報を書きこみました。");
out.println("");
out.close();
}
}