Servlet设置客户端缓存的过期时间

package gacl.servlet.study;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name="text",urlPatterns="/test")
public class TestServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /**
         * 设置缓存时间值，数据缓存到客户端，提升性能
         * 这里是将数据的缓存时间设置为1天
         */
	String data = "1234aa";
        response.setDateHeader("expires",System.currentTimeMillis() + 24 * 3600 * 1000);
        response.getOutputStream().write(data.getBytes());
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doGet(request, response);
    }

}