LastModified (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.web.servlet.mvc
Interface LastModified

All Known Implementing Classes:: MultiActionController

public interface LastModified

Supports last-modified HTTP requests to facilitate content caching. Same contract as for the Servlet API's getLastModified method.

Delegated to by a HandlerAdapter's getLastModified implementation. By default, any Controller or HttpRequestHandler within Spring's default framework can implement this interface to enable last-modified checking.

Author:: Rod Johnson, Juergen Hoeller
See Also:: HttpServlet.getLastModified(javax.servlet.http.HttpServletRequest), Controller, SimpleControllerHandlerAdapter, HttpRequestHandler, HttpRequestHandlerAdapter

Method Summary

long getLastModified(HttpServletRequest request)
Same contract as for HttpServlet's getLastModified method.

Method Summary
`long`	`getLastModified(HttpServletRequest request)` Same contract as for HttpServlet's `getLastModified` method.

Method Detail

getLastModified

long getLastModified(HttpServletRequest request)

Same contract as for HttpServlet's getLastModified method. Invoked before request processing.

The return value will be sent to the HTTP client as Last-Modified header, and compared with If-Modified-Since headers that the client sends back. The content will only get regenerated if there has been a modification.

Parameters:: request - current HTTP request
Returns:: the time the underlying resource was last modified, or -1 meaning that the content must always be regenerated
See Also:: HandlerAdapter.getLastModified(javax.servlet.http.HttpServletRequest, java.lang.Object), HttpServlet.getLastModified(javax.servlet.http.HttpServletRequest)