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       用户名                      

       密码                      

                 登录                        

$(".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" rel="external nofollow" ;        }else {         alert(result.extendInfo.login_error);        }      }     })   }  })

//JsonMsg工具类public class JsonMsg {  private int code;  private String msg;  private Map extendInfo = new HashMap();  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 getExtendInfo() {    return extendInfo;  }  public void setExtendInfo(Map 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("操作失败");    return res;  }  public JsonMsg addInfo(String key,Object object){    this.extendInfo.put(key,object);    return this;  }}

/*** controller* 判断用户名和密码是否正确*/　　@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","用户名或密码错误");    }    request.getSession().setAttribute("islogin","true");//如果正确，则在seesion里添加判断属性，可供拦截器判断是否登录过    return JsonMsg.success();  }

//自定义拦截器//如果未登录则跳回登录页public class SysInterceptor extends HandlerInterceptorAdapter {  /**   * 进入拦截器后首先进入的方法   * 返回false则不再继续执行   * 返回true则继续执行   */  @Override  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {    System.out.println("我是拦截器：我进来了");    HttpSession session = request.getSession();    String islogin = (String)session.getAttribute("islogin");    if(islogin==null){      System.out.println("用户没有登录");      response.sendRedirect("/cch/login");      return false;    }    System.out.println("用户已登录");    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 {  }}

//把拦截器添加到springboot中@Configurationpublic class SessionConfig implements WebMvcConfigurer {  @Override  public void addInterceptors(InterceptorRegistry registry) {//拦截有 "/cch" 前缀的路径，除了 "/cch/login","/cch/dologin"    registry.addInterceptor(new SysInterceptor()).excludePathPatterns("/cch/login","/cch/dologin").addPathPatterns("/cch/**");  }}