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
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);
}
}
其他回答
没有特殊的注释来表示servlet筛选器。您只需声明一个Filter类型的@Bean(或FilterRegistrationBean)。在Boot自己的EndpointWebMvcAutoConfiguration中有一个例子(为所有响应添加自定义头);
如果你只声明一个过滤器,它将被应用到所有的请求。如果您还添加了一个FilterRegistrationBean,您可以另外指定要应用的单个servlet和url模式。
注意:
从Spring Boot 1.4开始,FilterRegistrationBean不再弃用,而是简单地将包从org.springframework. Boot .context. embedd.filterregistrationbean移动到org.springframework.boot.web.servlet.FilterRegistrationBean
使用Spring注册过滤器大约有四种不同的选项。
首先,我们可以创建一个实现Filter或扩展HttpFilter的Spring bean:
@Component
public class MyFilter extends HttpFilter {
@Override
protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
throws IOException, ServletException {
// Implementation details...
chain.doFilter(request, response);
}
}
其次,我们可以创建一个扩展GenericFilterBean的Spring bean:
@Component
public class MyFilter extends GenericFilterBean {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
throws IOException, ServletException {
//Implementation details...
chain.doFilter(currentRequest, servletResponse);
}
}
我们也可以使用FilterRegistrationBean类:
@Configuration
public class FilterConfiguration {
private final MyFilter myFilter;
@Autowired
public FilterConfiguration(MyFilter myFilter) {
this.myFilter = myFilter;
}
@Bean
public FilterRegistrationBean<MyFilter> myFilterRegistration() {
FilterRegistrationBean<DateLoggingFilter> filterRegistrationBean = new FilterRegistrationBean<>();
filterRegistrationBean.setFilter(myFilter);
filterRegistrationBean.setUrlPatterns(Collections.singletonList("/*"));
filterRegistrationBean.setDispatcherTypes(DispatcherType.REQUEST);
filterRegistrationBean.setOrder(Ordered.LOWEST_PRECEDENCE - 1);
return filterRegistrationBean;
}
}
最后,我们可以使用@ServletComponentScan的@WebFilter注释:
@WebFilter(urlPatterns = "/*", dispatcherTypes = {DispatcherType.REQUEST})
public class MyFilter extends HttpFilter {
@Override
protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
throws IOException, ServletException {
// Implementation details...
chain.doFilter(request, response);
}
}
步骤1:通过实现filter接口创建一个过滤器组件。
@Component
public class PerformanceFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
...
...
}
}
步骤2:使用FilterRegistrationBean将这个过滤器设置为URI模式。
@Configuration
public class FilterConfig {
@Bean
public FilterRegistrationBean<PerformanceFilter> perfFilter() {
FilterRegistrationBean<PerformanceFilter> registration = new FilterRegistrationBean<>();
registration.setFilter(new PerformanceFilter());
registration.addUrlPatterns("/*");
return registration;
}
}
您可以参考此链接以获得完整的应用程序。
更新:2022-05-29:
在Spring Boot 1.5.8中有两种简单的方法可以做到这一点。发布,不需要XML。
第一个方法:
如果你没有任何特定的URL模式,你可以像这样使用@Component(完整的代码和细节在这里https://github.com/surasint/surasint-examples/tree/master/spring-boot-jdbi/3_spring-boot-filter,看看README.txt开始):
@Component
public class ExampleFilter implements Filter {
...
}
第二种方式:
如果你想使用URL模式,你可以像这样使用@WebFilter(完整的代码和细节在这里https://github.com/surasint/surasint-examples/tree/master/spring-boot-jdbi/4_spring-boot-filter-urlpattern,看看README.txt开始):
@WebFilter(urlPatterns = "/api/count")
public class ExampleFilter implements Filter {
...
}
但是你也需要在你的@SpringBootApplication类中添加@ServletComponentScan注释:
@ServletComponentScan
@SpringBootApplication
public class MyApplication extends SpringBootServletInitializer {
...
}
注意@Component是Spring的注释,而@WebFilter不是。@WebFilter是Servlet 3注释。
这两种方法都只需要在pom.xml中有一个基本的Spring Boot依赖项(不需要显式地嵌入Tomcat jasper)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
</parent>
<groupId>com.surasint.example</groupId>
<artifactId>spring-boot-04</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
警告:第一种方法,如果Spring Boot中的Controller返回到JSP文件,请求将通过过滤器两次。
而在第二种方式中,请求将只通过筛选器一次。
我更喜欢第二种方式,因为它更类似于Servlet规范中的默认行为。
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 {}
}