Question

如果从doFilter调用，则Spring Cache无法正常工作。

请注意，如果未从doFilter（）调用，则Spring缓存正在工作（例如，如果从休息服务调用）

如何在doFilter（）中启用缓存？（也许在doFilter中不允许缓存？）

@Configuration
@EnableCaching
public class CredentialsInjectionFilter implements javax.servlet.Filter {

    @Bean
    public CacheManager cacheManager() {
        SimpleCacheManager cacheManager = new SimpleCacheManager();
        cacheManager.setCaches(Arrays.asList(
                new ConcurrentMapCache("tenants")               
            ));
        return cacheManager;
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
    throws IOException, ServletException {
        display(5);
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Cacheable("tenants")
    public void display(int number) {
        // if cache working properly, code below will not execute after the first calling
        for(int i=0; i<50; i++) {   
               System.out.println("ramon called" +number);
        }
    }

Answer 1

如何扩展org.springframework.web.filter.GenericFilterBean，并将缓存详细信息移动到单独的服务类中

<强> CacheService

import java.util.Arrays;

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.concurrent.ConcurrentMapCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

    @Component
    public class CacheService{

        @Bean
        public CacheManager cacheManager() {
            SimpleCacheManager cacheManager = new SimpleCacheManager();
            cacheManager.setCaches(Arrays.asList(
                    new ConcurrentMapCache("tenants")               
                ));
            return cacheManager;
        }


        @Cacheable("tenants")
        public void display(int number) {
            // if cache working properly, code below will not execute after the first calling
            for(int i=0; i<50; i++) {   
                   System.out.println("ramon called" +number);
            }
        }
    }

<强> CredentialsInjectionFilter

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.filter.GenericFilterBean;

@Component
public class CredentialsInjectionFilter extends GenericFilterBean {

    @Autowired
    private CacheService cacheService;

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
    throws IOException, ServletException {
        cacheService.display(5);
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

Spring Cache无法在doFilter中运行

1 个答案: