很简单的几个java&ajax的小demo

package accp; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.util.Random; public class ajaxServlet extends HttpServlet { private static final String CONTENT_TYPE = "text/xml; charset=gb2312"; public void init() throws ServletException { } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); response.setHeader("Cache-Control", "no-cache"); response.setHeader("Pragma", "no-cache"); response.setDateHeader("Expires", 0); PrintWriter out = response.getWriter(); String action = request.getParameter("action"); if (("send").equals(action)) { Random random = new Random(); String AA = Integer.toString(Math.abs(random.nextInt())); String BB = Integer.toString(Math.abs(random.nextInt())); String CC = Integer.toString(Math.abs(random.nextInt())); String DD = Integer.toString(Math.abs(random.nextInt())); StringBuffer sb = new StringBuffer(); sb.append(AA); sb.append("@@@"); sb.append(BB); sb.append("@@@"); sb.append(CC); sb.append("@@@"); sb.append(DD); out.write(sb.toString()); out.close(); } } }