Spring Boot中是否有Filter类(用于web应用程序)的注释?也许@Filter ?
我想在我的项目中添加一个自定义过滤器。
Spring Boot参考指南中提到过 FilterRegistrationBean,但我不确定如何使用它。
Spring Boot中是否有Filter类(用于web应用程序)的注释?也许@Filter ?
我想在我的项目中添加一个自定义过滤器。
Spring Boot参考指南中提到过 FilterRegistrationBean,但我不确定如何使用它。
当前回答
你也可以使用@WebFilter来创建一个过滤器。这样就行了。
@Configuration
public class AppInConfig
{
@Bean
@Order(1)
public FilterRegistrationBean aiFilterRegistration()
{
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new TrackingFilter());
registration.addUrlPatterns("/**");
registration.setOrder(1);
return registration;
}
@Bean(name = "TrackingFilter")
public Filter TrackingFilter()
{
return new TrackingFilter();
}
}
其他回答
使用@WebFilter注释,可以这样做:
@WebFilter(urlPatterns = {"/*" })
public class AuthenticationFilter implements Filter{
private static Logger logger = Logger.getLogger(AuthenticationFilter.class);
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
logger.info("checking client id in filter");
HttpServletRequest request = (HttpServletRequest) arg0;
String clientId = request.getHeader("clientId");
if (StringUtils.isNotEmpty(clientId)) {
chain.doFilter(request, response);
} else {
logger.error("client id missing.");
}
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
对于Spring Boot在我所做的任何配置类:
@Bean
public OncePerRequestFilter myFilter() {
return new OncePerRequestFilter() {
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
AuthUser authUser = SecurityUtil.safeGet(); // applied after secutiry filters
...
filterChain.doFilter(request, response);
}
};
}
这就是全部,不需要任何注册。参见什么是OncePerRequestFilter?
你可以在实现javax.servlet.Filter的类上使用@WebFilter javax.servlet.annotation.WebFilter:
@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {
}
然后使用@ServletComponentScan注册。
如果您使用Spring Boot + Spring Security,则可以在安全配置中执行此操作。
在下面的示例中,我在UsernamePasswordAuthenticationFilter之前添加了一个自定义过滤器(请参阅所有默认的Spring安全过滤器及其顺序)。
@EnableWebSecurity
class SecurityConfig extends WebSecurityConfigurerAdapter {
@Autowired FilterDependency filterDependency;
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.addFilterBefore(
new MyFilter(filterDependency),
UsernamePasswordAuthenticationFilter.class);
}
}
还有筛选器类
class MyFilter extends OncePerRequestFilter {
private final FilterDependency filterDependency;
public MyFilter(FilterDependency filterDependency) {
this.filterDependency = filterDependency;
}
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response,
FilterChain filterChain)
throws ServletException, IOException {
// Filter
filterChain.doFilter(request, response);
}
}
下面是我的自定义Filter类的一个例子:
package com.dawson.controller.filter;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.GenericFilterBean;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
public class DawsonApiFilter extends GenericFilterBean {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
if (req.getHeader("x-dawson-nonce") == null || req.getHeader("x-dawson-signature") == null) {
HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.setContentType("application/json");
httpResponse.sendError(HttpServletResponse.SC_BAD_REQUEST, "Required headers not specified in the request");
return;
}
chain.doFilter(request, response);
}
}
我将它添加到Spring Boot配置中,如下所示:
package com.dawson.configuration;
import com.fasterxml.jackson.datatype.hibernate5.Hibernate5Module;
import com.dawson.controller.filter.DawsonApiFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
@SpringBootApplication
public class ApplicationConfiguration {
@Bean
public FilterRegistrationBean dawsonApiFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new DawsonApiFilter());
// In case you want the filter to apply to specific URL patterns only
registration.addUrlPatterns("/dawson/*");
return registration;
}
}