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如何在Servlet中得到传过来的中文字

change 2002-04-17 02:33:01

我有一个页面，里面有个form,post到一个servlet.
form中有一个text input.
我想在text中输入中文，并在Servlet中把它回显到页面中。
但是现在我从servlet的 request.getParameter(xxx)中得到的 String是乱码。
这是怎么回事？
<HTML>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<BODY>
<FORM Action="http://localhost:8100/servlet/MyServlet" method=post>
<input type="text" name="val" value="aaab">
<input type="submit" name="submit" value="submit">
</FORM>
</BODY>

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

public class MyServlet extends HttpServlet {
public MyServlet() {
}

public void init(ServletConfig config) throws ServletException {

}
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException
{
String parm = req.getParameter("val");
System.err.println(parm);

res.setContentType("text/html");
res.setHeader("Cache-Control", "no-cache");
res.setHeader("Pragma","no-cache");
res.setDateHeader("Expires", 0);

OutputStream output = res.getOutputStream();

PrintWriter writer = new PrintWriter(new OutputStreamWriter(output,"UTF8"));
writer.println("<HTML><Head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=gb2312\"></Head><Body>");
writer.println(parm);
writer.println("</Body></HTML>");
writer.flush();

}

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

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