📄 messageservlet.java~33~
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package chat;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class MessageServlet extends HttpServlet {
public MessageServlet() {
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
}
}
private static final String CONTENT_TYPE = "text/html; charset=GBK";
//Initialize global variables
public void init() throws ServletException {
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(CONTENT_TYPE);
response.setCharacterEncoding("GBK");
request.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
String strMsg = null;
strMsg = request.getParameter("message");
try {
if (strMsg.equals("") || (strMsg == null)) {
displayHtml(out);
} else {
ServletContext app = getServletContext();
StringBuffer objMsg = (StringBuffer) app.getAttribute("objMessage");
if (objMsg == null) {
objMsg = new StringBuffer("");
}
String UserName = request.getParameter("name");
objMsg.append("<b>" + UserName + "说：</b>" + strMsg + "<br>");
app.setAttribute("objMessage", objMsg);
displayHtml(out);
}
} catch (NullPointerException ee) {
displayHtml(out);
}
out.close();
}
public void displayHtml(PrintWriter out) {
out.println("<html>");
out.println("<head><title>Message</title></head>");
out.println("<body onload = 'javascript:frm.message.focus();'>");
out.println("<form method = post name = 'frm'>");
out.println("<input type = 'text' name = 'message' size = '40' >");
out.println("<input type = submit value = '发送'>");
out.println("</form></body></html>");
}
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
}
//Clean up resources
public void destroy() {
}
private void jbInit() throws Exception {
}
}
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