如何在弹簧靴中设置过滤链？

Question

我遇到了spring-boot,并打算为传入请求添加一个过滤器链.

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和问候过滤器:

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,仅接收"来自过滤器的问候语",并且HelloFilter不会调用它.

除此之外没有回应Greeting Controller.似乎GreetingFilter阻止了程序.

那么如何在Spring启动时设置过滤器链.上面的代码中是否有任何错误？

Answer 1

在GreetingFilter中添加以下代码行

filterChain.doFilter(servletRequest, servletResponse);

Answer 2

我想进一步澄清 Gangadhar 的建议。您可以尝试添加：

filterChain.doFilter(servletRequest, servletResponse);

在过滤器类的 doFilter 方法中。这将创建过滤器的链接。