Why ServletRequest and ServletResponse default data encoding is ISO8859-1?

why ServletRequest and ServletResponse default data encoding is ISO8859-1 not System default file.encoding?
So if my servlet contents Chinese charactors it can't write once runs any system with different encoding types.
for example:
import java.io.*;
import java.util.*;
import javax.servlet.http.*;
import javax.servlet.*;
public class HelloServlet extends HttpServlet {
  public void doGet (
     HttpServletRequest     req,
     HttpServletResponse     res
    ) throws ServletException, IOException
    res.setContentType("text/html");
    String hello = "Hello world 世界你好";
    PrintWriter pw = res.getWriter();
    pw.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">");
    pw.println("<head>");
    pw.println("<title>" + hello + "</title>");   
    pw.println("</head>");   
    pw.println();
    pw.println("<body>");
    pw.println();
    pw.println("<h1>" + hello +"</h1>");
    pw.println("</body>");
    pw.close();
  public HelloServlet() {}

A server parses parameters using the common ISO 8859-1 charset. When a browser uses another charset, it is supposed to send the encoding information in the Content-Type header of the request, but almost no browsers do.
In the Servlet 2.2 API (e.g Tomcat 3.x), the methods that parse parameter input always assume that it's sent as ISO 8859-1. So they create a String containing the correct bytes but incorrect charset.
In that case, you can use the com.oreilly.servlet.ParameterParser class and its setCharacterEncoding method :
http://www.servlets.com/cos/index.html
However,in Servlet 2.3 (e.g Tomcat 4), a new method on the HttpServletRequest object was added in order to be able to specify the request's parameters charset encoding:
  // Set the charset as Shift_JIS
  req.setCharacterEncoding("Shift_JIS");
  // Read a parameter using that charset
  String name = req.getParameter("name");The setCharacterEncoding call may throw java.io.UnsupportedEncodingException if the encoding is not supported.

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