Gateway（二）SpringCloudGateway向后续服务传递自定义header头信息

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我们在gateway服务中，创建一个拦截器；在拦截器中，向后续服务传递自定义header头信息。

拦截器定义如下：

复制代码

@Configuration
public class TestGlobalFilter implements GlobalFilter, Ordered {

@Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

// .....

// 封装需要向后续封装的header对象
        LinkedHashMap<String, String> headerMap = new LinkedHashMap<>();
        headerMap.put("header1", "1");
        headerMap.put("header2", "2");
        headerMap.put("header3", "3");
        chainFilterAndSetHeaders(chain, exchange, headerMap);

// .....
        //调用chain.filter继续向下游执行
        return chain.filter(exchange);

}

/**
     * 顺序,数值越小,优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 1;
    }

/**
     * 设置向后传递的header
     *
     * @param chain
     * @param exchange
     * @param headerMap
     */
    private Mono<Void> chainFilterAndSetHeaders(GatewayFilterChain chain, ServerWebExchange exchange, LinkedHashMap<String, String> headerMap) {
        // 添加header
        Consumer<HttpHeaders> httpHeaders = httpHeader -> {
            for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                // 遍历Map设置header，向后传递
                httpHeader.set(entry.getKey(), entry.getValue());
            }
        };

ServerHttpRequest newRequest = exchange.getRequest().mutate().headers(httpHeaders).build();
        ServerWebExchange build = exchange.mutate().request(newRequest).build();
        //将现在的request 变成 exchange对象
        return chain.filter(build);
    }
}

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@Configuration
public class TestGlobalFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        // .....

        // 封装需要向后续封装的header对象
        LinkedHashMap<String, String> headerMap = new LinkedHashMap<>();
        headerMap.put("header1", "1");
        headerMap.put("header2", "2");
        headerMap.put("header3", "3");
        chainFilterAndSetHeaders(chain, exchange, headerMap);

        // .....
        //调用chain.filter继续向下游执行
        return chain.filter(exchange);

    }

    /**
     * 顺序,数值越小,优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 1;
    }

    /**
     * 设置向后传递的header
     *
     * @param chain
     * @param exchange
     * @param headerMap
     */
    private Mono<Void> chainFilterAndSetHeaders(GatewayFilterChain chain, ServerWebExchange exchange, LinkedHashMap<String, String> headerMap) {
        // 添加header
        Consumer<HttpHeaders> httpHeaders = httpHeader -> {
            for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                // 遍历Map设置header，向后传递
                httpHeader.set(entry.getKey(), entry.getValue());
            }
        };

        ServerHttpRequest newRequest = exchange.getRequest().mutate().headers(httpHeaders).build();
        ServerWebExchange build = exchange.mutate().request(newRequest).build();
        //将现在的request 变成 exchange对象
        return chain.filter(build);
    }
}