springboot拦截器HandlerInterceptor的注入
一、问题描述
项目启动后,拦截器下的注入为null,影响拦截器的逻辑操作。如下图:
二、解决策略
原因: 拦截器加载是在springcontext创建之前完成,详情可以看spring的拦截器加载过程及IOC的关系
解决方案一:使用@Bean在拦截器初始化之前让类加载,重点在于@Bean的拦截器处理及getCheckFilter()的引入
具体如下:
// 拦截器处理
public class CheckFilter implements HandlerInterceptor {
@Autowired
private SystemService systemService;
}
// 配置类处理
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
@Bean
public CheckFilter getCheckFilter(){
return new CheckFilter();
}
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(getCheckFilter()).addPathPatterns("/**").
excludePathPatterns("/admin/auth/**");
super.addInterceptors(registry);
}
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
super.addResourceHandlers(registry);
}
@Override
protected void configureViewResolvers(ViewResolverRegistry registry) {
registry.jsp("/WEB-INF/",".jsp");
super.configureViewResolvers(registry);
}
}
解决方案二:给拦截器增加配置注解如:@Configuration 、@Component 。在配置类中注入,具体如下操作:
// 拦截器处理
@Configuration //或者 @Component
public class CheckFilter implements HandlerInterceptor {
@Autowired
private SystemService systemService;
}
// 配置类处理
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
@Autowired
private CheckFilter checkFilter;
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(checkFilter).addPathPatterns("/**").
excludePathPatterns("/admin/auth/**");
super.addInterceptors(registry);
}
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
super.addResourceHandlers(registry);
}
@Override
protected void configureViewResolvers(ViewResolverRegistry registry) {
registry.jsp("/WEB-INF/",".jsp");
super.configureViewResolvers(registry);
}
}
三、知识总结
1、涉及spring的拦截器加载过程及IOC的管理
2、参考资料//www.jb51.net/article/223241.htm
springboot HandlerInterceptor 拦截器匹配规则写错 导致 拦截器无效
项目中发现拦截器无效,访问接口 /user/xxx/xxx 没有进入到拦截器中
@Configuration
public class WebConfigurer implements WebMvcConfigurer {
@Autowired
private UserInterceptor userInterceptor;
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(userInterceptor).addPathPatterns("/user/*");
}
}
原因是 拦截器的匹配规则弄错了。我希望 userInterceptor拦截器 拦截 /user/下所有路径的接口
正确拦截规则是 /user/**
拦截规则粟子
addPathPatterns("/**")
表示拦截所有的请求,
addPathPatterns("/**")
表示拦截所有的请求,
addPathPatterns("/test/**")
表示拦截/test/ 下的所有路径请求,
addPathPatterns("/test/*")
表示拦截/test/abc,拦截/test/aaa , 不拦截 /test/abc/def
addPathPatterns("/test/**").excludePathPatterns("/test/login", “/test/register”)
表示拦截/test/ 下的所有路径请求,但不拦截 /test/login 和 /test/register
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。