Java 如何在spring boot中设置过滤链？
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How to set up filter chain in spring boot?
提问by chenatu
I have come across spring-boot and intend to add a filter chain for incoming request.
我遇到了 spring-boot 并打算为传入的请求添加一个过滤器链。
Here is the Application:
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);
}
}
Here is the Controller:
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));
}
}
Here is the Filter Config:
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;
}
}
Here is the HelloFilter and Greeting Filter:
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() {
}
}
When I start the application and run curl localhost:8080/greeting, Only "Greetings from filter" is received and the HelloFilteris not invoked.
当我启动应用程序并运行时curl localhost:8080/greeting，只收到“来自过滤器的问候”并且HelloFilter没有调用。
Besides there is no response from Greeting Controller. It seems that the GreetingFilterblocks the procedure.
此外没有任何回应Greeting Controller。似乎GreetingFilter阻止了程序。
So how to set the filter chain in Spring boot. Are there any bugs in the code above?
那么如何在Spring boot中设置过滤链。上面的代码是否有任何错误？
采纳答案by Gangadhar
Adding following line of code in GreetingFilter works
在 GreetingFilter 中添加以下代码行有效
filterChain.doFilter(servletRequest, servletResponse);
回答by Ankit Basarkar
I would just like to clarify a little more on what Gangadhar suggested. You can try adding :
我只想进一步澄清 Gangadhar 的建议。您可以尝试添加：
filterChain.doFilter(servletRequest, servletResponse);
filterChain.doFilter(servletRequest, servletResponse);
in doFilter method of your filter classes.This will create chaining of the filters.
在过滤器类的 doFilter 方法中。这将创建过滤器的链接。
