java获取客户端请求中cookie中的sessionId,销毁session重新建立sessionId

asfx站长

2020.10.31 13:31:47 阅读 759

```
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Controller
public class HomeController {
    private HttpSession httpSession=null;
    private String sessionId=null;
    private Cookie cookie=null;
    @RequestMapping("/")
    public String home(){
        return "login";
    }
    @RequestMapping("/login")
    public String login(HttpServletRequest request, HttpServletResponse response,String name,String pwd){

if(request.getCookies() ==null){
            System.out.println("No Cookies");
            System.out.println("Creating Cookie");
            httpSession=request.getSession(true);
            sessionId=httpSession.getId();
            cookie=new Cookie("u_id",sessionId);
           response.addCookie(cookie);
        }else{
            for (Cookie c:request.getCookies()){
                if(c.getName().equals("u_id")){
                    System.out.println("uid="+c.getName());
                    if(c.getValue().equals(sessionId)){

cookie.setValue(null);
                        cookie.setMaxAge(0);
                        cookie.setPath("/");
                        /*销毁session*/
                        request.getSession().invalidate();
                       sessionId= request.getSession(true).getId();
                        cookie=new Cookie("u_id",sessionId);
                        System.out.println("New sessionId"+sessionId);
                        response.addCookie(cookie);
                    }
                }
            }
        }

return "";
    }
}
```