1 前言
注册登录可以说是平时开发中最常见的东西了,但是一般进入到公司之后,像这样的功能早就开发完了,除非是新的项目。这两天就碰巧遇到了这样一个需求,完成pc端的注册登录功能。
实现这样的需求有很多种方式:像
1)HandlerInterceptor+WebMvcConfigurer+ThreadLocal
2)Filter过滤器
3)安全框架Shiro(轻量级框架)
4)安全框架Spring Securety(重量级框架)
而我采用的是第一种 Spring HandlerInterceptor+WebMvcConfigurer+ThreadLocal技术来实现。
2 具体类
2.1HandlerInterceptor
HandlerInterceptor是springMVC中为拦截器提供的接口,类似于Servlet开发中的过滤器Filter,用于处理器进行预处理和后处理,需要重写三个方法。
preHandle:
调用时间:controller方法处理之前
执行顺序: 链式Intercepter情况下,Intercepter按照声明顺序一个接一个执行
若返回false,则中断执行,注意:不会进入afterCompletion
postHandle:
调用前提:preHandle返回true
调用时间:Controller方法处理完之后,DispatcherServlet进行视图渲染之前,也就是说在这个方法中可以对ModelAndView进行操作
执行顺序:链式Interceptor情况下,Intercepter按照声明顺序执行
备注:postHandle虽然是post开头,但是post请求,get请求都能处理
afterCompletion:
调用前提:preHandle返回true
调用时间:DispatcherServlet进行视图的渲染之后
多用于清理资源
2.2WebMvcConfigurer
WebMvcConfigurer配置类其实是Spring
内部的一种配置方式,采用JavaBean
的形式来代替传统的xml
配置文件形式进行针对框架个性化定制,可以自定义一些Handler,Interceptor,ViewResolver,MessageConverter。基于java-based方式的spring mvc配置,需要创建一个配置类并实现WebMvcConfigurer
接口;
在Spring Boot 1.5版本都是靠重写WebMvcConfigurerAdapter的方法来添加自定义拦截器,消息转换器等。SpringBoot 2.0 后,该类被标记为@Deprecated(弃用)。官方推荐直接实现WebMvcConfigurer或者直接继承WebMvcConfigurationSupport,方式一实现WebMvcConfigurer接口(推荐),方式二继承WebMvcConfigurationSupport类
3 代码实践
1)编写拦截器HeadTokenInterceptor使其继承HandlerInterceptor
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package com.liubujun.config; import com.liubujun.moudle.UserToken; import com.liubujun.util.SecurityContextUtil; import lombok.extern.slf4j.Slf4j; import org.springframework.http.HttpStatus; import org.springframework.stereotype.Component; import org.springframework.util.StringUtils; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.xml.ws.handler.Handler; import java.io.IOException; /** * @Author: liubujun * @Date: 2022/5/21 16:12 */ @Component @Slf4j public class HeadTokenInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String authorization = request.getHeader( "Authorization" ); if (authorization == null ) { unauthorized(response); return false ; } //这里一般都会解析出userToken的值,这里为了方便就直接new了 UserToken userToken = new UserToken(); SecurityContextUtil.addUser(userToken); return false ; } @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 { SecurityContextUtil.removeUser(); } private void unauthorized(HttpServletResponse response) { response.setStatus(HttpStatus.UNAUTHORIZED.value()); try { response.getWriter().append(HttpStatus.UNAUTHORIZED.getReasonPhrase()); } catch (IOException e) { log.error( "HttpServletResponse writer error.msg" ,HttpStatus.UNAUTHORIZED.getReasonPhrase()); log.error(e.getMessage(),e); } } } |
2)编写MyWebMvcConfigurer使其继承WebMvcConfigurationSupport
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package com.liubujun.config; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; import java.util.ArrayList; /** * @Author: liubujun * @Date: 2022/5/21 16:40 */ @Configuration public class MyWebMvcConfigurer extends WebMvcConfigurationSupport { @Autowired private HeadTokenInterceptor headTokenInterceptor; /** * 类似于白名单,在这边添加的请求不会走拦截器 * @param registry */ @Override public void addInterceptors(InterceptorRegistry registry) { ArrayList<String> pattres = new ArrayList<>(); pattres.add( "/login/login" ); registry.addInterceptor(headTokenInterceptor).excludePathPatterns(pattres).addPathPatterns( "/**" ); super .addInterceptors(registry); } /** * 添加静态资源 * @param registry */ @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler( "xxx.html" ) .addResourceLocations( "classpath:/META-INF/resources" ); super .addResourceHandlers(registry); } } |
3)编写ThreadLocal类存放用户信息
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package com.liubujun.util; import com.liubujun.moudle.UserToken; import org.springframework.core.NamedThreadLocal; /** * @Author: liubujun * @Date: 2022/5/23 9:41 */ public class SecurityContextUtil { private static ThreadLocal<UserToken> threadLocal = new NamedThreadLocal<>( "user" ); public static void addUser(UserToken user){ threadLocal.set(user); } public static UserToken getUser(){ return threadLocal.get(); } public static void removeUser(){ threadLocal.remove(); } public static String getPhoneNumber(){ return threadLocal.get().getPhoneNumber(); } public static Integer getId(){ return threadLocal.get().getId(); } public static String getUserText(){ return threadLocal.get().getUserText(); } } |
4)编写测试controller
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@RestController @RequestMapping (value = "/login" ,produces = { "application/json;charset=UTF-8" }) public class Login { @PostMapping ( "/login" ) public String login(){ return "登录请求不需要拦截" ; } @PostMapping ( "/other" ) public String other(){ return "其他的请求需要拦截" ; } } |
5)测试
测试login接口,(不传token直接放行)
测试其他接口,不传token被拦截到
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原文链接:https://blog.csdn.net/qq_50652600/article/details/124872456