Spring Cloud Zuul自定义过滤器实战

谁借莪１个温暖的怀抱￠ 2021-07-24 19:40 429阅读 0赞

**一 代码位置**

[https://github.com/cakin24/spring-cloud-code/tree/master/ch][https_github.com_cakin24_spring-cloud-code_tree_master_ch]8-1

**二 测试**

1 启动eureka-server

2 启动client-a

3 启动zuul-server

4 访问http://localhost:5555/client/mul?a=100&b=200

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

从结果可知：FirstPreFilter、SecondPreFilter、ThirdPreFilter、GroovyFilter、PostFilter过滤器依次生效。

5 访问[http://localhost:5555/client/mul?b=200][http_localhost_5555_client_mul_b_200]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

从结果可知：FirstPreFilter、SecondPreFilter、GroovyFilter、PostFilter过滤器依次生效。

6 访问[http://localhost:5555/client/mul?a=200][http_localhost_5555_client_mul_b_200]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

从结果可知：FirstPreFilter、SecondPreFilter、ThirdPreFilter、GroovyFilter、PostFilter过滤器依次生效。

7 修改GroovyFilter.groovy代码如下

import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.*;
    
    
    import javax.servlet.http.HttpServletRequest
    
    
    import com.netflix.zuul.ZuulFilter
    import com.netflix.zuul.context.RequestContext
    import com.netflix.zuul.exception.ZuulException
    
    
    class GroovyFilter extends ZuulFilter {
    
    
        @Override
        public String filterType() {
            return PRE_TYPE
        }
        
        @Override
        public int filterOrder() {
            return 10
        }
        
        @Override
        public boolean shouldFilter() {
            return true
        }
    
    
        @Override
        public Object run() throws ZuulException {
            HttpServletRequest request = RequestContext.currentContext.request as HttpServletRequest
            Iterator headerIt = request.getHeaderNames().iterator()
            while (headerIt.hasNext()) {
                String name = (String) headerIt.next()
                String value = request.getHeader(name)
                println("header: " + name + ":" + value)
            }
            println("This is Groovy Filter!good Groovy Filter")
            return null
        }
    }

再次访问[http://localhost:5555/client/mul?a=100&b=200][http_localhost_5555_client_mul_b_200]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3][]

从结果可知，修改GroovyFilter后，无须重写编译，过滤器也能生效。

[https_github.com_cakin24_spring-cloud-code_tree_master_ch]: https://github.com/cakin24/spring-cloud-code/tree/master/ch6-1
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/e82fd46c1c8e40bcb514bb20de24bfb1.png
[http_localhost_5555_client_mul_b_200]: http://localhost:5555/client/mul?a=100&b=200
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/720b0e6668d546429ebcd33dd6af90ec.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/0c289056384240178c23bd4825b663f2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3]: /images/20210724/9fe925d9d9244390bec14196dc200b66.png