17-6.java

实例丰富经典

package select;
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;
public class SelectCity extends HttpServlet 
{ 
  public SelectCity()
  {
    super();
  }
  public void destroy()
  {
    super.destroy(); 
  }
  //响应Get请求函数
  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 ("hn".equals(state))
	{
      sb.append("<city>changsha</city><city>xiangtan</city><city>zhuzhou</city>");
    } else if("gd".equals(state)){
      sb.append("<city>guangzhou</city><city>shaoguan</city><city>zhanjiang</city>");
    }
    sb.append("</state>");
    PrintWriter out=response.getWriter();
    out.write(sb.toString());
    out.close();
  }
}