selectcityservlet.java

对刚接触AJAX的同学很有学习价值

package ajax;
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;

/**
* @author Administrator
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class SelectCityServlet extends HttpServlet{


public SelectCityServlet() {
  super();
}

public void destroy() {
  super.destroy(); 
}

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
  response.setContentType("text/xml");
  response.setHeader("Cache-Control", "no-cache");
  String state = request.getParameter("state");
  StringBuffer sb=new StringBuffer("<state>");
  if("zj".equals(state)){
     sb.append<("<city>hangzhou/city><city>huzhou</city>");
  }else if("zs".equals(state)){
    sb.append("<city>nanjing</city><city>yangzhou</city><city>suzhou</city>");
 }
sb.append("</state>");
PrintWriter out=response.getWriter();
out.write(sb.toString());
out.close();
}
}