ServletResponse的刷新头和禁止浏览器缓存头的使用

         使用jsp+servlet时，有些代码期待写在servlet中，而在jsp程序中尽量写页面代码，像在注册的时候，注册成功时要显示信息的时候，这些代码可以在jsp中通过Java代码显示，也可以在servlet中显示，可是使用servlet到jsp页面的跳转语句时，就不会显示servlet页面的内容啦，这时我们可以借助Response中的刷新头，使页面停留一些时间，然后调转到jsp页面，这样servlet中的内容也可以显示啦，看一下代码：

package com.you.servlet;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 com.you.bean.UserBean;import com.you.domain.Domain;public class RegisteServlet extends HttpServlet {private String name;private String word;private String sex;private String birth;private String email;private String address;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=UTF-8");request.setCharacterEncoding("UTF-8");UserBean userBean = new UserBean();userBean.setUsername(request.getParameter("username"));userBean.setPassword(request.getParameter("userpassword"));userBean.setSex(request.getParameter("sex"));String year = request.getParameter("year");String month = request.getParameter("month");String day = request.getParameter("day");userBean.setBirth(year + "年" + month + "月" + day + "日");userBean.setEmail(request.getParameter("email"));userBean.setAddress(request.getParameter("address"));        request.getSession().setAttribute("user", userBean);        name = userBean.getUsername();        word = userBean.getPassword();        sex = userBean.getSex();        birth = userBean.getBirth();        email = userBean.getEmail();        address = userBean.getAddress();        Domain myDo = new Domain();myDo.insert(name, word, sex, birth, email, address); PrintWriter out = response.getWriter();        out.print(name+"<br/>");        out.print(word+"<br/>");        out.print(sex+"<br/>");        out.print(birth+"<br/>");        out.print(email+"<br/>");        out.print(address);        response.setHeader("refresh", "5;URL=http://localhost:8080/Login_5/register.jsp");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

       浏览器实现缓存的话，这样不能实现信息的及时更新，可以通过禁止浏览器缓存头。看一下代码：

package com.you.servlet;import java.io.IOException;public class CacheTestServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");response.setDateHeader("Expires", 0);response.setHeader("Cache-Control", "no-cache");response.setHeader("Prama", "no-cache");PrintWriter out = response.getWriter();out.println("本次响应的随机数为：" + Math.random());out.println("<form action='NotServlet'" + "method='post'"+"第一个参数：<input type='text' name='p1'><br/>" + "第二个参数：<textarea name='p2'></textarea><br/>" +"<input type='submit' value='提交'>" +"</form>");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

上面的三句都是禁止浏览器缓存的头，因为担心有些浏览器不识别，所以三种类型的都写上，这样就都会实现啦。