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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'
};
}
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Download: ServletUnicodeEscapeString.zip( 1,067 k)