56 lines
2.1 KiB
Java
56 lines
2.1 KiB
Java
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package com.baeldung.cache;
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import org.springframework.http.CacheControl;
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import org.springframework.http.ResponseEntity;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import org.springframework.web.context.request.WebRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.util.concurrent.TimeUnit;
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@Controller
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public class CacheControlController {
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@RequestMapping(value = "/hello/{name}", method = RequestMethod.GET)
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public ResponseEntity<String> helloWorld(@PathVariable String name) {
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CacheControl cacheControl = CacheControl.maxAge(60, TimeUnit.SECONDS)
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.noTransform()
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.mustRevalidate();
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return ResponseEntity.ok()
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.cacheControl(cacheControl)
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.body("Hello " + name);
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}
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@RequestMapping(value = "/home/{name}", method = RequestMethod.GET)
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public String home(@PathVariable String name, final HttpServletResponse response) {
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response.addHeader("Cache-Control", "max-age=60, must-revalidate, no-transform");
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return "home";
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}
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@RequestMapping(value = "/cache/{name}", method = RequestMethod.GET)
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public ResponseEntity<String> intercept(@PathVariable String name) {
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return ResponseEntity.ok().body("Hello " + name);
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}
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@RequestMapping(value = "/validate/{name}", method = RequestMethod.GET)
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public ResponseEntity<String> validate(@PathVariable String name, WebRequest request) {
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ZoneId zoneId = ZoneId.of("GMT");
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long lastModifiedTimestamp = LocalDateTime.of(2020, 02, 4, 19, 57, 45)
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.atZone(zoneId).toInstant().toEpochMilli();
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if (request.checkNotModified(lastModifiedTimestamp)) {
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return ResponseEntity.status(304).build();
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}
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return ResponseEntity.ok().body("Hello " + name);
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}
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}
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