SpringBoot登录判断过程代码实例

这篇文章主要介绍了SpringBoot登录判断代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

<!--  html登录代码  -->

<div class="box">
     <div class="title">登录</div>
     <div class="input">
       <label for="name">用户名</label>
       <input type="text" name="name" id="name">
       <span class="spin"></span>
     </div>
     <div class="input">
       <label for="pass">密码</label>
       <input type="password" name="pass" id="pass">
       <span class="spin"></span>
     </div>
     <div class="button login">
       <button>
         <span>登录</span>
         <i class="fa fa-check"></i>
       </button>
     </div>
     <a href="javascript:" rel="external nofollow" class="pass-forgot">忘记密码？</a>
   </div>

<!-- javasript 登录代码 -->
$(".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<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 * 判断是否登录过
   return JsonMsg.success();
 }

//自定义 *
//如果未登录则跳回登录页

public class SysInterceptor extends HandlerInterceptorAdapter {
 /**
  * 进入 * 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 * ：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 * 添加到springboot中

@Configuration
public 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/**");
 }
}

来源：https://www.cnblogs.com/gaofei200/p/12095971.html