MyServlet.java Source code

Introduction

Here is the source code for MyServlet.java

Source

import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class MyServlet extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        try {
            res.setContentType("text/plain; charset=UTF-8");
            PrintWriter out = res.getWriter();

            String charset = req.getParameter("charset");

            String text = req.getParameter("text");

            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(new StringBufferInputStream(text), charset));
            text = reader.readLine();

            out.println("Received charset: " + charset);
            out.println("Received text: " + text);
            out.println("Received text (escaped): " + toUnicodeEscapeString(text));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        doGet(req, res);
    }

    private static String toUnicodeEscapeString(String str) {
        // Modeled after the code in java.util.Properties.save()
        StringBuffer buf = new StringBuffer();
        int len = str.length();
        char ch;
        for (int i = 0; i < len; i++) {
            ch = str.charAt(i);
            switch (ch) {
            case '\\':
                buf.append("\\\\");
                break;
            case '\t':
                buf.append("\\t");
                break;
            case '\n':
                buf.append("\\n");
                break;
            case '\r':
                buf.append("\\r");
                break;

            default:
                if (ch >= ' ' && ch <= 127) {
                    buf.append(ch);
                } else {
                    buf.append('\\');
                    buf.append('u');
                    buf.append(toHex((ch >> 12) & 0xF));
                    buf.append(toHex((ch >> 8) & 0xF));
                    buf.append(toHex((ch >> 4) & 0xF));
                    buf.append(toHex((ch >> 0) & 0xF));
                }
            }
        }
        return buf.toString();
    }

    private static char toHex(int nibble) {
        return hexDigit[(nibble & 0xF)];
    }

    private static char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
            'f' };
}