spring boot -- 过滤器

蔚落 2022-06-16 02:27 115阅读 0赞

1.定义一个自己的过滤器，实现Filter接口，使用@WebFilter(filterName = "myFilter", urlPatterns = "/\*")注解来注册命名过滤器，指定过滤地址。

package com.huike.base.servlet;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Qualifier;
    import org.springframework.context.ApplicationContext;
    import org.springframework.web.context.support.WebApplicationContextUtils;
    
    @WebFilter(filterName = "myFilter")
    public class PagesSecurityFilter implements Filter {
    
    	@Qualifier("tokenUserInfoService")
    	@Autowired(required = true)
    	private TokenUserInfoService tokenUserInfoService;
    
    	@Qualifier("publickeyService")
    	@Autowired(required = true)
    	private PublickeyService publickeyService;
    
    	private static Log log = LogFactory.getLog(PagesSecurityFilter.class);
    
    	private static final String X_REQUESTED_WITH = "X-Requested-With";
    
    	public PagesSecurityFilter() {
    
    	}
    
    	@Override
    	public void init(FilterConfig filterConfig) throws ServletException {
    
    	}
    
    	@Override
    	public void destroy() {
    
    	}
    
    	@Override
    	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
    			throws IOException, ServletException {
    
    		HttpServletRequest request = (HttpServletRequest) req;
    		HttpServletResponse response = (HttpServletResponse) resp;
    		// 设置字符集
    		request.setCharacterEncoding("UTF-8");
    	 chain.doFilter(request, response);
    	}
    
    }

spring boot还提供了FilterRegistrationBean来进行filter的配置

package com.huike.base.servlet;
    
    import javax.servlet.Filter;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class StarsFilterConfiguration {
    	/* FilterRegistrationBean 用来配置urlpattern 来确定哪些路径触发filter */
    	private static Log log = LogFactory.getLog(StarsFilterConfiguration.class);
    	@Bean
    	public FilterRegistrationBean someFilterRegistration() {
    		log.info("StarsFilterConfiguration..........");
    		FilterRegistrationBean registration = new FilterRegistrationBean();
    		registration.setFilter(AuthFilter());
    		registration.setEnabled(true); // 设置是否可用 
    		registration.addUrlPatterns("/api/app/rest/*","/api/web/rest/*"); // 需要进行过滤的url
    //		registration.addUrlPatterns("/api/app/rest/*");
    		registration.setOrder(1); // 设置过滤器的顺序，可选
    		return registration;
    	}
    
    	/* 使用annotation tag来取代<bean></bean> */
    	@Bean()
    	public Filter AuthFilter() {
    		return new PagesSecurityFilter();
    	}
    }

3.有一个地方要注意，如果@WebFilter(filterName = "myFilter", urlPatterns = "/\*")中配置的过滤地址优先级大于在FilterRegistrationBean中配置的过滤地址。