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<>springboot实现用户登录功能
这里也适用于SpringMVC,使用原理是一样的
一,前台页面,使用validate做了一些判断
<script type="text/javascript"> $(function(){ $("#loginForm").validate({ rules:
{ "username": { required: true }, "password":{ required:true } }, messages:{
"username":{ required:"用户名不能为空" }, "password":{ required:"密码不能为空" } },
submitHandler:function(form){ $(form).ajaxSubmit({ dataType:'json', success:
function(data){ if(data.success){ $.messager.confirm("提示信息","登录成功",function(){
window.location.href="/personal"; }) }else{ $.messager.popup(data.msg); } } });
}, //自定义错误样式 errorClass:"text-danger", //未通过验证,进行高亮处理或其他处理； highlight:function(
input){ $(input).closest(".form-group").addClass("has-error"); },
//通过验证,清除高亮效果或其他处理； unhighlight:function(input){ $(input).closest(".form-group")
.removeClass("has-error"); } }); }); </script>
二后台实现
1.controller
/** * 登录控制 */ @RequestMapping("login") @ResponseBody public AjaxResult login(
String username,String password){ AjaxResult result = new AjaxResult();
Logininfo logininfo= service.login(username, password); if(logininfo==null){
result.setMsg("用户名或密码错误"); }else{ UserContext.putCurrebtUser(logininfo); }
return result; }
2.userContext工具类(核心代码在这里)
/** * 保存和获取当前用户的工具类 * Created by lenovo on 2020/1/16. */ public class
UserContext { private static final String CURRENT_USER_IN_SESSION = "logininfo";
/** * 得到session */ private static HttpSession getSession(){
//SpringMVC获取session的方式通过RequestContextHolder return ((ServletRequestAttributes)
RequestContextHolder.currentRequestAttributes()).getRequest().getSession(); }
/** * 设置当前用户到session中 */ public static void putCurrebtUser(Logininfo currentUser
) { getSession().setAttribute(CURRENT_USER_IN_SESSION,currentUser); } /** *
获取当前用户 */ public static Logininfo getCurreentUser() { return (Logininfo)
getSession().getAttribute(CURRENT_USER_IN_SESSION); } }
3.mapper
/** * 用户登录 * @param username 用户名 * @param encode 密码 * @return */ Logininfo
login(@Param("username") String username, @Param("password") String encode);
4.mapper.xml
<select id="login" resultMap="BaseResultMap"> SELECT <include refid=
"base_column"/> FROM logininfo WHERE username=#{username} and password=#{
password} </select>
三:
这里做的就是当登录成功后,把当前用户的信息保存到session中,这个是很重要的,因为做页面跳转是会大量使用到当前用户的信息
使用的是RequestContextHolder
RequestContextHolder顾名思义,持有上下文的Request容器.
具体实现如下:
//两个方法在没有使用JSF的项目中是没有区别的 RequestAttributes requestAttributes =
RequestContextHolder.currentRequestAttributes();
//RequestContextHolder.getRequestAttributes(); //从session里面获取对应的值 String str = (
String) requestAttributes.getAttribute("name",RequestAttributes.SCOPE_SESSION);
HttpServletRequest request= ((ServletRequestAttributes)requestAttributes).
getRequest(); HttpServletResponse response = ((ServletRequestAttributes)
requestAttributes).getResponse();
2.RequestContextHolder这个类,里面有两个ThreadLocal保存当前线程下的request
//得到存储进去的request private static final ThreadLocal<RequestAttributes>
requestAttributesHolder= new NamedThreadLocal<RequestAttributes>("Request
attributes"); //可被子线程继承的request private static final ThreadLocal<
RequestAttributes> inheritableRequestAttributesHolder = new
NamedInheritableThreadLocal<RequestAttributes>("Request context");
3.getRequestAttributes()`方法,相当于直接获取ThreadLocal里面的值,这样就保证了每一次获取到的Request是该请求的request
public static RequestAttributes getRequestAttributes() { RequestAttributes
attributes= requestAttributesHolder.get(); if (attributes == null) { attributes
= inheritableRequestAttributesHolder.get(); } return attributes; }
我这里只是简单的看了一下源码,具体的request和response等是什么时候设置进去的等还没有深入了解.