响应客户端请求（servlet与jsp）

public class getAndPost extends HttpServlet
{
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException , IOException
{
response.setContentType("text/html");
//获取参数
request.getParameter("type");

//获取字符输出流，返回参数值
PrintWriter writer = response.getWriter();
writer.print(ret);
writer.flush();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//doGet调用doPost，实现Get请求
doPost(req, resp);
}
}

<servlet>
<servlet-name>market</servlet-name>
<servlet-class>com.test.MarketService</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>market</servlet-name>
<url-pattern>/market</url-pattern>
</servlet-mapping>

<%
String type = request.getParameter("type");
out.println("type=="+type);
out.println("OK");
%>