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
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;
}
}
其他回答
Use:
@WebFilter(urlPatterns="/*")
public class XSSFilter implements Filter {
private static final org.apache.log4j.Logger LOGGER = LogManager.getLogger(XSSFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
LOGGER.info("Initiating XSSFilter... ");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpRequestWrapper requestWrapper = new HttpRequestWrapper(req);
chain.doFilter(requestWrapper, response);
}
@Override
public void destroy() {
LOGGER.info("Destroying XSSFilter... ");
}
}
你需要实现Filter,并且它需要用@WebFilter(urlPatterns="/*")进行注释。
在Application或Configuration类中,您需要添加@ServletComponentScan。通过此操作,您的筛选器将被注册。
下面是一个在Spring Boot MVC应用程序中包含自定义过滤器的方法示例。确保在组件扫描中包含该包:
package com.dearheart.gtsc.filters;
import java.io.IOException;
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.http.HttpServletResponse;
import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Component;
@Component
public class XClacksOverhead implements Filter {
public static final String X_CLACKS_OVERHEAD = "X-Clacks-Overhead";
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader(X_CLACKS_OVERHEAD, "GNU Terry Pratchett");
chain.doFilter(req, res);
}
@Override
public void destroy() {}
@Override
public void init(FilterConfig arg0) throws ServletException {}
}
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。
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
}
}
我在这里看到了很多答案,但我没有尝试任何一个。我刚刚创建了如下代码所示的过滤器。
import org.springframework.context.annotation.Configuration;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
@WebFilter(urlPatterns = "/Admin")
@Configuration
public class AdminFilter implements Filter{
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("happened");
}
@Override
public void destroy() {
}
}
我让剩下的Spring Boot应用程序保持原样。