SpringBoot登錄判斷

<!--    html登錄代碼    -->

        <div class="box">
            <div class="title">登錄</div>
            <div class="input">
                <label for="name">用戶名</label>
                <input type="text" name="name" id="name">
                <span class="spin"></span>
            </div>
            <div class="input">
                <label for="pass">密碼</label>
                <input type="password" name="pass" id="pass">
                <span class="spin"></span>
            </div>
            <div class="button login">
                <button>
                    <span>登錄</span>
                    <i class="fa fa-check"></i>
                </button>
            </div>
            <a href="javascript:" class="pass-forgot">忘記密碼？</a>
        </div>

<!-- javasript 登錄代碼 -->
$(".button").click(function(e) {
      $("button", this).addClass('active');
      if ($(".button").hasClass("login")){
         $.ajax({
            url:"/cch/dologin",
            type:"POST",
            data:{
               name:$("#name").serialize(),
               pass:$("#pass").serialize(),
            },
            success:function (result) {
               if(result.code==100){
                  window.location.href="/cch/main";
               }else {
                  alert(result.extendInfo.login_error);
               }
            }
         })
      }
   })

//JsonMsg工具類
public class JsonMsg {
    private int code;
    private String msg;
    private Map<String,Object> extendInfo = new HashMap<String, Object>();

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Map<String, Object> getExtendInfo() {
        return extendInfo;
    }

    public void setExtendInfo(Map<String, Object> extendInfo) {
        this.extendInfo = extendInfo;
    }

    public static JsonMsg success(){
        JsonMsg res = new JsonMsg();
        res.setCode(100);
        res.setMsg("操作成功");
        return res;
    }

    public static JsonMsg fail(){
        JsonMsg res = new JsonMsg();
        res.setCode(200);
        res.setMsg("操作失敗");
        return res;
    }

    public JsonMsg addInfo(String key,Object object){
        this.extendInfo.put(key,object);
        return this;
    }
}

/**
* controller
* 判斷用戶名和密碼是否正確
*/
　　@RequestMapping(value = "/cch/dologin",method = RequestMethod.POST)
    @ResponseBody
    public JsonMsg dologin(HttpServletRequest request){
        String username = request.getParameter("name");
        String password = request.getParameter("pass");
        System.out.println(username+" "+password);
        if (!"name=admin".equals(username) || !"pass=123".equals(password)){
            return JsonMsg.fail().addInfo("login_error","用戶名或密碼錯誤");
        }
        request.getSession().setAttribute("islogin","true");//如果正確，則在seesion里添加判斷屬性，可供攔截器判斷是否登錄過
        return JsonMsg.success();
    }

//自定義攔截器
//如果未登錄則跳回登錄頁

public class SysInterceptor extends HandlerInterceptorAdapter {
    /**
     * 進入攔截器后首先進入的方法
     * 返回false則不再繼續執行
     * 返回true則繼續執行
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("我是攔截器：我進來了");
        HttpSession session = request.getSession();
        String islogin = (String)session.getAttribute("islogin");
        if(islogin==null){
            System.out.println("用戶沒有登錄");
            response.sendRedirect("/cch/login");
            return false;
        }
        System.out.println("用戶已登錄");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

//把攔截器添加到springboot中

@Configuration
public class SessionConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
//攔截有 "/cch" 前綴的路徑，除了 "/cch/login","/cch/dologin"
        registry.addInterceptor(new SysInterceptor()).excludePathPatterns("/cch/login","/cch/dologin").addPathPatterns("/cch/**");
    }
}