服务端获取Cookie报错
访问过aServlet再访问bServlet网页正常，控制台正常，关闭浏览器直接访问bServlet 网页报错，控制台报错。 请问是什么原因呢package web;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/aServlet")
public class AServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie cookie = new Cookie("username", "zs");
response.addCookie(cookie);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
package web;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/bServlet")
public class BServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取Cookie
//1. 获取Cookie数组
Cookie[] cookies = request.getCookies();
//2. 遍历数组
for (Cookie cookie : cookies) {
//3. 获取数据
String name = cookie.getName();
if("username".equals(name)){
String value = cookie.getValue();
System.out.println(name+":"+value);
break;
}
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
bServlet中 获取Cookie方法 在当前浏览器获取不到cookie信息会报错， 500 //3. 获取数据
String name = cookie.getName();
你先判断下cookie != null后再做下面的操作试试
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