如何在Spring Boot中设置过滤器链？

  • Z时代
  • 2024-01-10
  • 分类：问答

我遇到过spring-boot，打算为传入的请求添加过滤器链。

这是应用程序：

package example.hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        ApplicationContext ctx = SpringApplication.run(Application.class, args);
    }
}

这是控制器：

package example.hello;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.concurrent.atomic.AtomicLong;
@RestController
public class GreetingController {
    private static final String template = "Hello, %s!";
    private final AtomicLong counter = new AtomicLong();
    @RequestMapping("/greeting")
    public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
        return new Greeting(counter.incrementAndGet(),
                String.format(template, name));
    }
}

这是过滤器配置：

package example.hello;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class WebConfig {
    @Bean
    public FilterRegistrationBean greetingFilterRegistrationBean() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setName("greeting");
        GreetingFilter greetingFilter = new GreetingFilter();
        registrationBean.setFilter(greetingFilter);
        registrationBean.setOrder(1);
        return registrationBean;
    }
    @Bean
    public FilterRegistrationBean helloFilterRegistrationBean() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setName("hello");
        HelloFilter helloFilter = new HelloFilter();
        registrationBean.setFilter(helloFilter);
        registrationBean.setOrder(2);
        return registrationBean;
    }
}

这是HelloFilter和Greeting过滤器：

package example.hello;
import javax.servlet.*;
import java.io.IOException;
public class HelloFilter 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("HelloFilter!");
    }
    @Override
    public void destroy() {
    }
}
package example.hello;
import javax.servlet.*;
import java.io.IOException;
public class GreetingFilter 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("Greetings from filter!");
    }
    @Override
    public void destroy() {
    }
}

当我启动应用程序并运行时curl localhost:8080/greeting，仅收到“来自过滤器的问候”，并且HelloFilter不会被调用。

此外，没有任何回应Greeting Controller。似乎GreetingFilter阻止了该程序。

那么如何在Spring Boot中设置过滤器链。上面的代码中有任何错误吗？

回答：

在GreetingFilter中添加以下代码行

filterChain.doFilter(servletRequest, servletResponse);

以上是 如何在Spring Boot中设置过滤器链？ 的全部内容， 来源链接： utcz.com/qa/419206.html

回到顶部