基于Ant路径匹配规则AntPathMatcher的注意事项
AntPathMatcher前言
(1)SpringMVC的路径匹配规则是依照Ant的来的,实际上不只是SpringMVC,整个Spring框架的路径解析都是按照Ant的风格来的;
(2)AntPathMatcher不仅可以匹配Spring的@RequestMapping路径,也可以用来匹配各种字符串,包括文件路径等。
基本规则
(1)? 匹配一个字符(除过操作系统默认的文件分隔符)
(2)* 匹配0个或多个字符
(3)**匹配0个或多个目录
(4){spring:[a-z]+} 将正则表达式[a-z]+匹配到的值,赋值给名为 spring 的路径变量.
(PS:必须是完全匹配才行,在SpringMVC中只有完全匹配才会进入controller层的方法)
注意事项
(1)匹配文件路径,需要匹配某目录下及其各级子目录下所有的文件,使用/**/*而非*.*,因为有的文件不一定含有文件后缀;
(2)匹配文件路径,使用AntPathMatcher创建一个对象时,需要注意AntPathMatcher也有有参构造,传递路径分隔符参数pathSeparator,对于文件路径的匹配来说,则需要根据不同的操作系统来传递各自的文件分隔符,以此防止匹配文件路径错误。源码截图如下:
可以看到,AntPathMatcher默认路径分隔符为“/”,而在匹配文件路径时,需要注意Windows下路径分隔符为“\”,Linux下为“/”,写法即为:
AntPathMatcher matcher = new AntPathMatcher(File.separator); AntPathMatcher matcher = new AntPathMatcher(System.getProperty("file.separator"));
(3)最长匹配规则(has more characters),即越精确的模式越会被优先匹配到。例如,URL请求/app/dir/file.jsp,现在存在两个路径匹配模式/**/*.jsp和/app/dir/*.jsp,那么会根据模式/app/dir/*.jsp来匹配。
测试用例
// test exact matching assertTrue(pathMatcher.match("test", "test")); assertTrue(pathMatcher.match("/test", "/test")); assertTrue(pathMatcher.match("http://example.org", "http://example.org")); // SPR-14141 assertFalse(pathMatcher.match("/test.jpg", "test.jpg")); assertFalse(pathMatcher.match("test", "/test")); assertFalse(pathMatcher.match("/test", "test")); // test matching with ?'s assertTrue(pathMatcher.match("t?st", "test")); assertTrue(pathMatcher.match("??st", "test")); assertTrue(pathMatcher.match("tes?", "test")); assertTrue(pathMatcher.match("te??", "test")); assertTrue(pathMatcher.match("?es?", "test")); assertFalse(pathMatcher.match("tes?", "tes")); assertFalse(pathMatcher.match("tes?", "testt")); assertFalse(pathMatcher.match("tes?", "tsst")); // test matching with *'s assertTrue(pathMatcher.match("*", "test")); assertTrue(pathMatcher.match("test*", "test")); assertTrue(pathMatcher.match("test*", "testTest")); assertTrue(pathMatcher.match("test/*", "test/Test")); assertTrue(pathMatcher.match("test/*", "test/t")); assertTrue(pathMatcher.match("test/*", "test/")); assertTrue(pathMatcher.match("*test*", "AnothertestTest")); assertTrue(pathMatcher.match("*test", "Anothertest")); assertTrue(pathMatcher.match("*.*", "test.")); assertTrue(pathMatcher.match("*.*", "test.test")); assertTrue(pathMatcher.match("*.*", "test.test.test")); assertTrue(pathMatcher.match("test*aaa", "testblaaaa")); assertFalse(pathMatcher.match("test*", "tst")); assertFalse(pathMatcher.match("test*", "tsttest")); assertFalse(pathMatcher.match("test*", "test/")); assertFalse(pathMatcher.match("test*", "test/t")); assertFalse(pathMatcher.match("test/*", "test")); assertFalse(pathMatcher.match("*test*", "tsttst")); assertFalse(pathMatcher.match("*test", "tsttst")); assertFalse(pathMatcher.match("*.*", "tsttst")); assertFalse(pathMatcher.match("test*aaa", "test")); assertFalse(pathMatcher.match("test*aaa", "testblaaab")); // test matching with ?'s and /'s assertTrue(pathMatcher.match("/?", "/a")); assertTrue(pathMatcher.match("/?/a", "/a/a")); assertTrue(pathMatcher.match("/a/?", "/a/b")); assertTrue(pathMatcher.match("/??/a", "/aa/a")); assertTrue(pathMatcher.match("/a/??", "/a/bb")); assertTrue(pathMatcher.match("/?", "/a")); // test matching with **'s assertTrue(pathMatcher.match("/**", "/testing/testing")); assertTrue(pathMatcher.match("/*/**", "/testing/testing")); assertTrue(pathMatcher.match("/**/*", "/testing/testing")); assertTrue(pathMatcher.match("/bla/**/bla", "/bla/testing/testing/bla")); assertTrue(pathMatcher.match("/bla/**/bla", "/bla/testing/testing/bla/bla")); assertTrue(pathMatcher.match("/**/test", "/bla/bla/test")); assertTrue(pathMatcher.match("/bla/**/**/bla", "/bla/bla/bla/bla/bla/bla")); assertTrue(pathMatcher.match("/bla*bla/test", "/blaXXXbla/test")); assertTrue(pathMatcher.match("/*bla/test", "/XXXbla/test")); assertFalse(pathMatcher.match("/bla*bla/test", "/blaXXXbl/test")); assertFalse(pathMatcher.match("/*bla/test", "XXXblab/test")); assertFalse(pathMatcher.match("/*bla/test", "XXXbl/test")); assertFalse(pathMatcher.match("/????", "/bala/bla")); assertFalse(pathMatcher.match("/**/*bla", "/bla/bla/bla/bbb")); assertTrue(pathMatcher.match("/*bla*/**/bla/**", "/XXXblaXXXX/testing/testing/bla/testing/testing/")); assertTrue(pathMatcher.match("/*bla*/**/bla/*", "/XXXblaXXXX/testing/testing/bla/testing")); assertTrue(pathMatcher.match("/*bla*/**/bla/**", "/XXXblaXXXX/testing/testing/bla/testing/testing")); assertTrue(pathMatcher.match("/*bla*/**/bla/**", "/XXXblaXXXX/testing/testing/bla/testing/testing.jpg")); assertTrue(pathMatcher.match("*bla*/**/bla/**", "XXXblaXXXX/testing/testing/bla/testing/testing/")); assertTrue(pathMatcher.match("*bla*/**/bla/*", "XXXblaXXXX/testing/testing/bla/testing")); assertTrue(pathMatcher.match("*bla*/**/bla/**", "XXXblaXXXX/testing/testing/bla/testing/testing")); assertFalse(pathMatcher.match("*bla*/**/bla/*", "XXXblaXXXX/testing/testing/bla/testing/testing")); assertFalse(pathMatcher.match("/x/x/**/bla", "/x/x/x/")); assertTrue(pathMatcher.match("/foo/bar/**", "/foo/bar")) ; assertTrue(pathMatcher.match("", "")); assertTrue(pathMatcher.match("/{bla}.*", "/testing.html"));
spring url匹配工具类----AntPathMatcher
在gateway进行授权认证时,有些请求url需要过滤掉,针对带/service/{id}/user-info这种带操作符的请求,需要特殊处理----AntPathMatcher就上场啦
具体使用场景
1.登录授权验证:过滤掉登录请求,一些资源获取请求
2.请求接口日志打印:过滤掉文件上传和下载的一些请求,requestBody里的文件流会被异常修改
具体代码:
请求body的二次写入
@Component public class CachePostBodyFilter implements GlobalFilter, Ordered { private final List<HttpMessageReader<?>> messageReaders; public CachePostBodyFilter() { this.messageReaders = HandlerStrategies.withDefaults().messageReaders(); } @Override public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) { ServerHttpRequest request = exchange.getRequest(); if (FilterUrl.excludeUrls(new FilterUrl(request.getPath().toString(), request.getMethod()))) { return chain.filter(exchange); } if (Objects.equals(request.getMethod(), HttpMethod.POST)) { ServerRequest serverRequest = ServerRequest.create(exchange, messageReaders); Mono<String> modifiedBody = serverRequest.bodyToMono(String.class) .flatMap(body -> { exchange.getAttributes().put(RequestConstants.REQUEST_BODY, body); return Mono.just(body); }); BodyInserter bodyInserter = BodyInserters.fromPublisher(modifiedBody, String.class); HttpHeaders headers = new HttpHeaders(); headers.putAll(exchange.getRequest().getHeaders()); // the new content type will be computed by bodyInserter // and then set in the request decorator headers.remove(HttpHeaders.CONTENT_LENGTH); CachedBodyOutputMessage outputMessage = new CachedBodyOutputMessage(exchange, headers); return bodyInserter.insert(outputMessage, new BodyInserterContext()). then(Mono.defer(() -> { ServerHttpRequest decorator = decorate(exchange, headers, outputMessage); return chain.filter(exchange.mutate().request(decorator).build()); })); } return chain.filter(exchange); } ServerHttpRequestDecorator decorate(ServerWebExchange exchange, HttpHeaders headers, CachedBodyOutputMessage outputMessage) { return new ServerHttpRequestDecorator(exchange.getRequest()) { @Override public HttpHeaders getHeaders() { long contentLength = headers.getContentLength(); HttpHeaders httpHeaders = new HttpHeaders(); httpHeaders.putAll(headers); if (contentLength > 0) { httpHeaders.setContentLength(contentLength); } else { httpHeaders.set(HttpHeaders.TRANSFER_ENCODING, "chunked"); } return httpHeaders; } @Override public Flux<DataBuffer> getBody() { return outputMessage.getBody(); } }; } @Override public int getOrder() { return -8; } }
@Data @NoArgsConstructor @AllArgsConstructor public class FilterUrl { private String url; private HttpMethod method; public static boolean excludeUrls(FilterUrl targetUrl) { List<FilterUrl> excludeUrls = Lists.newArrayList(); excludeUrls.add(new FilterUrl("/api/v1/service/users", HttpMethod.POST)); excludeUrls.add(new FilterUrl("/api/v1/service/terms/{termId}/export", HttpMethod.GET)); AntPathMatcher antPathMatcher = new AntPathMatcher(); return excludeUrls.stream() .anyMatch(url -> antPathMatcher.match(url.getUrl(), targetUrl.getUrl()) && url.getMethod().equals(targetUrl.getMethod())); } }
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。
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