필터로드 자바의 두 종류

먼저, 첫 번째

1. 코드

@WebFilter(filterName="LoginCheckFilter",urlPatterns="*")
public class LoginCheckFilter implements Filter {
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
	}
	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		System.out.println("filter");
		HttpServletRequest httpRequest = (HttpServletRequest)request;
		HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setCharacterEncoding("UTF-8");    
        httpResponse.setContentType("application/json; charset=utf-8"); 
        httpResponse.setHeader("Access-Control-Allow-Origin", "*");
        httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
        httpResponse.setHeader("Access-Control-Allow-Methods", "*");
        httpResponse.setHeader("Access-Control-Allow-Headers", "Content-Type,Authorization");
        httpResponse.setHeader("Access-Control-Expose-Headers", "*");
		chain.doFilter(httpRequest, httpResponse);
	}
	@Override
	public void destroy() {
		// TODO Auto-generated method stub
	}
}

2.로드 (시작 위 클래스 플러스 코멘트 @ServletComponentScan)

@SpringBootApplication
@ComponentScan(basePackages = {"com.thread.threadtest.*"})
@ServletComponentScan
@EnableAsync
public class ThreadtestApplication {
    public static void main(String[] args) {
        SpringApplication.run(ThreadtestApplication.class, args);
    }
}

3. 시작 후, 백엔드 인터페이스는 갈이 필터에 액세스하고, 우리는 필터 출력에 그 문장을 작성합니다.

둘째, 두 번째 방법

1. 코드

public class LoginCheckFilter2 implements Filter {
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
	}
	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		System.out.println("filter 22222");
		chain.doFilter(request, response);
	}
	@Override
	public void destroy() {
		// TODO Auto-generated method stub
	}
}

2. 구성은 클래스로드

@Configuration
public class FilterConfig {
    @Bean
    public FilterRegistrationBean filterRegistration() {
        FilterRegistrationBean reg = new FilterRegistrationBean();
        reg.setFilter(new LoginCheckFilter2());
        reg.addUrlPatterns("*");
        return reg;
    }
}

동일한 효과를 달성 할 수있는 3 위

의 셋째, 말

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