Answers:
URL的不匹配部分作为名为的请求属性公开HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE
:
@RequestMapping("/{id}/**")
public void foo(@PathVariable("id") int id, HttpServletRequest request) {
String restOfTheUrl = (String) request.getAttribute(
HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
...
}
restOfTheUrl
将是整个路径,而不仅仅是**
刚发现与我的问题相对应的问题。使用HandlerMapping常量,我可以为此目的编写一个小型实用程序:
/**
* Extract path from a controller mapping. /controllerUrl/** => return matched **
* @param request incoming request.
* @return extracted path
*/
public static String extractPathFromPattern(final HttpServletRequest request){
String path = (String) request.getAttribute(
HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
String bestMatchPattern = (String ) request.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE);
AntPathMatcher apm = new AntPathMatcher();
String finalPath = apm.extractPathWithinPattern(bestMatchPattern, path);
return finalPath;
}
这已经有一段时间了,但是发布了。可能对某人有用。
@RequestMapping( "/{id}/**" )
public void foo( @PathVariable String id, HttpServletRequest request ) {
String urlTail = new AntPathMatcher()
.extractPathWithinPattern( "/{id}/**", request.getRequestURI() );
}
在Fabien Kruba已经非常好的答案的基础上,我认为,可以将**
URL 的一部分作为注释通过控制器方法作为参数提供给控制器方法,这与@RequestParam
和相似@PathVariable
,而不是始终使用实用程序方法,那将是很好的明确要求HttpServletRequest
。因此,这是一个如何实现的示例。希望有人发现它有用。
创建注释以及参数解析器:
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface WildcardParam {
class Resolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter methodParameter) {
return methodParameter.getParameterAnnotation(WildcardParam.class) != null;
}
@Override
public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {
HttpServletRequest request = nativeWebRequest.getNativeRequest(HttpServletRequest.class);
return request == null ? null : new AntPathMatcher().extractPathWithinPattern(
(String) request.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE),
(String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE));
}
}
}
注册方法参数解析器:
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
resolvers.add(new WildcardParam.Resolver());
}
}
在控制器处理程序方法中使用注释可以轻松访问**
URL 的一部分:
@RestController
public class SomeController {
@GetMapping("/**")
public void someHandlerMethod(@WildcardParam String wildcardParam) {
// use wildcardParam here...
}
}
您需要使用内置的pathMatcher
:
@RequestMapping("/{id}/**")
public void test(HttpServletRequest request, @PathVariable long id) throws Exception {
ResourceUrlProvider urlProvider = (ResourceUrlProvider) request
.getAttribute(ResourceUrlProvider.class.getCanonicalName());
String restOfUrl = urlProvider.getPathMatcher().extractPathWithinPattern(
String.valueOf(request.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE)),
String.valueOf(request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE)));
我已经使用Tuckey URLRewriteFilter来处理包含'/'字符的路径元素,因为我认为Spring 3 MVC还不支持它们。
您将此过滤器放到您的应用中,并提供一个XML配置文件。在该文件中,您提供了重写规则,可用于将包含'/'字符的路径元素转换为Spring MVC使用@RequestParam可以正确处理的请求参数。
WEB-INF / web.xml:
<filter>
<filter-name>UrlRewriteFilter</filter-name>
<filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
</filter>
<!-- map to /* -->
WEB-INF / urlrewrite.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE urlrewrite
PUBLIC "-//tuckey.org//DTD UrlRewrite 3.0//EN"
"http://tuckey.org/res/dtds/urlrewrite3.0.dtd">
<urlrewrite>
<rule>
<from>^/(.*)/(.*)$</from>
<to last="true">/$1?restOfTheUrl=$2</to>
</urlrewrite>
控制器方式:
@RequestMapping("/{id}")
public void handler(@PathVariable("id") int id, @RequestParam("restOfTheUrl") String pathToFile) {
...
}
是的,restOfTheUrl
它不会只返回所需的值,而是可以通过UriTemplate
匹配来获取值。
我已经解决了问题,所以这里是该问题的有效解决方案:
@RequestMapping("/{id}/**")
public void foo(@PathVariable("id") int id, HttpServletRequest request) {
String restOfTheUrl = (String) request.getAttribute(
HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
/*We can use UriTemplate to map the restOfTheUrl*/
UriTemplate template = new UriTemplate("/{id}/{value}");
boolean isTemplateMatched = template.matches(restOfTheUrl);
if(isTemplateMatched) {
Map<String, String> matchTemplate = new HashMap<String, String>();
matchTemplate = template.match(restOfTheUrl);
String value = matchTemplate.get("value");
/*variable `value` will contain the required detail.*/
}
}
这是我的方法。您可以看到我如何将请求的URI转换为文件系统路径(此SO问题所针对的内容)。奖励:还有如何响应文件。
@RequestMapping(value = "/file/{userId}/**", method = RequestMethod.GET)
public void serveFile(@PathVariable("userId") long userId, HttpServletRequest request, HttpServletResponse response) {
assert request != null;
assert response != null;
// requestURL: http://192.168.1.3:8080/file/54/documents/tutorial.pdf
// requestURI: /file/54/documents/tutorial.pdf
// servletPath: /file/54/documents/tutorial.pdf
// logger.debug("requestURL: " + request.getRequestURL());
// logger.debug("requestURI: " + request.getRequestURI());
// logger.debug("servletPath: " + request.getServletPath());
String requestURI = request.getRequestURI();
String relativePath = requestURI.replaceFirst("^/file/", "");
Path path = Paths.get("/user_files").resolve(relativePath);
try {
InputStream is = new FileInputStream(path.toFile());
org.apache.commons.io.IOUtils.copy(is, response.getOutputStream());
response.flushBuffer();
} catch (IOException ex) {
logger.error("Error writing file to output stream. Path: '" + path + "', requestURI: '" + requestURI + "'");
throw new RuntimeException("IOError writing file to output stream");
}
}
private final static String MAPPING = "/foo/*";
@RequestMapping(value = MAPPING, method = RequestMethod.GET)
public @ResponseBody void foo(HttpServletRequest request, HttpServletResponse response) {
final String mapping = getMapping("foo").replace("*", "");
final String path = (String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
final String restOfPath = url.replace(mapping, "");
System.out.println(restOfPath);
}
private String getMapping(String methodName) {
Method methods[] = this.getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
if (methods[i].getName() == methodName) {
String mapping[] = methods[i].getAnnotation(RequestMapping.class).value();
if (mapping.length > 0) {
return mapping[mapping.length - 1];
}
}
}
return null;
}
我有一个类似的问题,我以这种方式解决了:
@RequestMapping(value = "{siteCode}/**/{fileName}.{fileExtension}")
public HttpEntity<byte[]> getResource(@PathVariable String siteCode,
@PathVariable String fileName, @PathVariable String fileExtension,
HttpServletRequest req, HttpServletResponse response ) throws IOException {
String fullPath = req.getPathInfo();
// Calling http://localhost:8080/SiteXX/images/argentine/flag.jpg
// fullPath conentent: /SiteXX/images/argentine/flag.jpg
}
请注意,这req.getPathInfo()
将返回完整的路径(带有{siteCode}
和{fileName}.{fileExtension}
),因此您必须方便地进行处理。