<!--  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:" rel="external nofollow" 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" rel="external nofollow" ;
        }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(xù)執(zhí)行
   * 返回true則繼續(xù)執(zhí)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/**");
  }
}