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see the <b><a href="/zh/docs/developer/custom-filter">latest version</a></b> (2.6.1).</div></div><div class="docItemContainer_oiyr"><article><span class="badge badge--secondary">Version: 2.5.1</span><div class="tocCollapsible_aw-L tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="markdown"><header><h1 class="h1Heading_dC7a">自定义Filter</h1></header><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_WiXH" id="说明"></a>说明<a class="hash-link" href="#说明" title="Direct link to heading">#</a></h2><ul><li>本文介绍如何对 <code>org.springframework.web.server.WebFliter</code> 进行扩展。</li></ul><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_WiXH" id="跨域支持"></a>跨域支持<a class="hash-link" href="#跨域支持" title="Direct link to heading">#</a></h2><ul><li>新增 <code>org.apache.shenyu.web.filter.CrossFilter</code> 实现 <code>WebFilter</code>。</li></ul><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI java"><pre tabindex="0" class="prism-code language-java codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain"> public class CrossFilter implements WebFilter {</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final String ALLOWED_HEADERS = "x-requested-with, authorization, Content-Type, Authorization, credential, X-XSRF-TOKEN,token,username,client";</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final String ALLOWED_METHODS = "*";</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final String ALLOWED_ORIGIN = "*";</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final String ALLOWED_EXPOSE = "*";</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final String MAX_AGE = "18000";</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> @Override</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> @SuppressWarnings("all")</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> public Mono<Void> filter(final ServerWebExchange exchange, final WebFilterChain chain) {</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> ServerHttpRequest request = exchange.getRequest();</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> if (CorsUtils.isCorsRequest(request)) {</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> ServerHttpResponse response = exchange.getResponse();</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> HttpHeaders headers = response.getHeaders();</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> headers.add("Access-Control-Allow-Origin", ALLOWED_ORIGIN);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> headers.add("Access-Control-Allow-Methods", ALLOWED_METHODS);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> headers.add("Access-Control-Max-Age", MAX_AGE);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> headers.add("Access-Control-Allow-Headers", ALLOWED_HEADERS);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> headers.add("Access-Control-Expose-Headers", ALLOWED_EXPOSE);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> headers.add("Access-Control-Allow-Credentials", "true");</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> if (request.getMethod() == HttpMethod.OPTIONS) {</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> response.setStatusCode(HttpStatus.OK);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> return Mono.empty();</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> return chain.filter(exchange);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><ul><li>将 <code>CrossFilter</code> 注册成为 <code>Spring</code>的<code>bean</code>。</li></ul><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_WiXH" id="网关过滤-springboot健康检查"></a>网关过滤 springboot健康检查<a class="hash-link" href="#网关过滤-springboot健康检查" title="Direct link to heading">#</a></h2><ul><li>注意顺序，使用 <code>@Order</code> 注解</li></ul><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI java"><pre tabindex="0" class="prism-code language-java codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain">@Component</span></span><span class="token-line" style="color:#393A34"><span class="token plain">@Order(-99)</span></span><span class="token-line" style="color:#393A34"><span class="token plain">public final class HealthFilter implements WebFilter {</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final String[] FILTER_TAG = {"/actuator/health", "/health_check"};</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> @Override</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> public Mono<Void> filter(@Nullable final ServerWebExchange exchange, @Nullable final WebFilterChain chain) {</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> ServerHttpRequest request = Objects.requireNonNull(exchange).getRequest();</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> String urlPath = request.getURI().getPath();</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> for (String check : FILTER_TAG) {</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> if (check.equals(urlPath)) {</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> String result = JsonUtils.toJson(new Health.Builder().up().build());</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> DataBuffer dataBuffer = exchange.getResponse().bufferFactory().wrap(result.getBytes());</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> return exchange.getResponse().writeWith(Mono.just(dataBuffer));</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> return Objects.requireNonNull(chain).filter(exchange);</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_WiXH" id="继承-orgapacheshenyuwebfilterabstractwebfilter"></a>继承 <code>org.apache.shenyu.web.filter.AbstractWebFilter</code><a class="hash-link" href="#继承-orgapacheshenyuwebfilterabstractwebfilter" title="Direct link to heading">#</a></h2><ul><li>新增一个类继承<code>AbstractWebFilter</code>，并实现它的两个方法。</li></ul><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI java"><pre tabindex="0" class="prism-code language-java codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain"> /**</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * this is Template Method ,children Implement your own filtering logic.</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> *</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * @param exchange the current server exchange</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * @param chain provides a way to delegate to the next filter</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * @return {@code Mono<Boolean>} result：TRUE (is pass)，and flow next filter；FALSE (is not pass) execute doDenyResponse(ServerWebExchange exchange)</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> */</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> protected abstract Mono<Boolean> doFilter(ServerWebExchange exchange, WebFilterChain chain);</span></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> |
| </span></span><span class="token-line" style="color:#393A34"><span class="token plain"> /**</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * this is Template Method ,children Implement your own And response client.</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> *</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * @param exchange the current server exchange.</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> * @return {@code Mono<Void>} response msg.</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> */</span></span><span class="token-line" style="color:#393A34"><span class="token plain"> protected abstract Mono<Void> doDenyResponse(ServerWebExchange exchange);</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><ul><li><code>doFilter</code> 方法返回 <code>Mono<true></code> 表示通过，反之则不通过，不通过的时候，会调用 <code>doDenyResponse</code>输出相关信息到前端。</li></ul></div><footer class="row docusaurus-mt-lg"><div class="col"><a href="https://github.com/apache/shenyu-website/edit/main/i18n/zh/docusaurus-plugin-content-docs/version-2.5.1/developer/custom-filter.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_mS5F" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>编辑本文档</a></div><div class="col lastUpdated_wj+Z"></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/zh/docs/2.5.1/developer/spi/custom-rate-limiter"><div class="pagination-nav__sublabel">上一篇</div><div class="pagination-nav__label">« 自定义限流策略</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/zh/docs/2.5.1/developer/custom-jwt-covert-algorithm"><div class="pagination-nav__sublabel">下一篇</div><div class="pagination-nav__label">自定义JWT插件转化算法 »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_vrFS thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#说明" class="table-of-contents__link">说明</a></li><li><a href="#跨域支持" class="table-of-contents__link">跨域支持</a></li><li><a href="#网关过滤-springboot健康检查" class="table-of-contents__link">网关过滤 springboot健康检查</a></li><li><a href="#继承-orgapacheshenyuwebfilterabstractwebfilter" class="table-of-contents__link">继承 <code>org.apache.shenyu.web.filter.AbstractWebFilter</code></a></li></ul></div></div></div></div></main></div></div></div> |
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