本文主要是介绍使用过滤器做登录，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

设置controller

@RestController
public class TestController {
    @RequestMapping("/login")
    public String login(HttpSession session,String name,String password){
        System.out.println(name);
        System.out.println(password);
        // 这个需要查数据库判断用户名和密码是否正确
        if(Objects.equals(name, "xx") && Objects.equals(password, "xx"))
        {
            // 成功服务器记录sessionid，并设置生存时间，可以自行设置删除策略
            LoginInterceptor.MAP.put(session.getId(),16);
            return "成功";
        }
        return "失败";

    }
    @RequestMapping("/index")
    public String index(){
        return "登录";
    }
    @RequestMapping("/hello")
    public String helloWorld(){
        return "hello world";
    }
    @RequestMapping("/hello02")
    public String helloWorld02(){
        return "hello world 02";
    }
}

设置过滤器

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;

public class LoginFilter implements Filter {
    // 这里我们也可以放在redis
    public static final HashMap<String, Integer> MAP = new HashMap<>();
    //不需要登录就可以访问的路径(比如:注册登录等)
    String[] includeUrls = new String[]{"/login","/index"};
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        if(!isNeedFilter(request.getRequestURI())){
            return;
        }
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        if(MAP.containsKey(((HttpServletRequest) servletRequest).getRequestedSessionId())) {
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
        request.getRequestDispatcher("/index").forward(request,response);
    }

    public boolean isNeedFilter(String uri) {

        for (String includeUrl : includeUrls) {
            if(includeUrl.equals(uri)) {
                return false;
            }
        }

        return true;
    }
}

过滤器配置

import org.springframework.boot.web.servlet.FilterRegistrationBean;
public class FilterConfig {
    public FilterRegistrationBean registFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new LoginFilter());
        registration.addUrlPatterns("/*");
        registration.setName("LogCostFilter");
        registration.setOrder(1);
        return registration;
    }
}

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