下面列出了org.springframework.http.CacheControl#empty ( ) 实例代码,或者点击链接到github查看源代码,也可以在右侧发表评论。
/**
* Apply the given cache seconds and generate corresponding HTTP headers,
* i.e. allow caching for the given number of seconds in case of a positive
* value, prevent caching if given a 0 value, do nothing else.
* Does not tell the browser to revalidate the resource.
* @param response current HTTP response
* @param cacheSeconds positive number of seconds into the future that the
* response should be cacheable for, 0 to prevent caching
*/
@SuppressWarnings("deprecation")
protected final void applyCacheSeconds(HttpServletResponse response, int cacheSeconds) {
if (this.useExpiresHeader || !this.useCacheControlHeader) {
// Deprecated HTTP 1.0 cache behavior, as in previous Spring versions
if (cacheSeconds > 0) {
cacheForSeconds(response, cacheSeconds);
}
else if (cacheSeconds == 0) {
preventCaching(response);
}
}
else {
CacheControl cControl;
if (cacheSeconds > 0) {
cControl = CacheControl.maxAge(cacheSeconds, TimeUnit.SECONDS);
if (this.alwaysMustRevalidate) {
cControl = cControl.mustRevalidate();
}
}
else if (cacheSeconds == 0) {
cControl = (this.useCacheControlNoStore ? CacheControl.noStore() : CacheControl.noCache());
}
else {
cControl = CacheControl.empty();
}
applyCacheControl(response, cControl);
}
}
/**
* Apply the given cache seconds and generate corresponding HTTP headers,
* i.e. allow caching for the given number of seconds in case of a positive
* value, prevent caching if given a 0 value, do nothing else.
* Does not tell the browser to revalidate the resource.
* @param response current HTTP response
* @param cacheSeconds positive number of seconds into the future that the
* response should be cacheable for, 0 to prevent caching
*/
@SuppressWarnings("deprecation")
protected final void applyCacheSeconds(HttpServletResponse response, int cacheSeconds) {
if (this.useExpiresHeader || !this.useCacheControlHeader) {
// Deprecated HTTP 1.0 cache behavior, as in previous Spring versions
if (cacheSeconds > 0) {
cacheForSeconds(response, cacheSeconds);
}
else if (cacheSeconds == 0) {
preventCaching(response);
}
}
else {
CacheControl cControl;
if (cacheSeconds > 0) {
cControl = CacheControl.maxAge(cacheSeconds, TimeUnit.SECONDS);
if (this.alwaysMustRevalidate) {
cControl = cControl.mustRevalidate();
}
}
else if (cacheSeconds == 0) {
cControl = (this.useCacheControlNoStore ? CacheControl.noStore() : CacheControl.noCache());
}
else {
cControl = CacheControl.empty();
}
applyCacheControl(response, cControl);
}
}
/**
* Apply the given cache seconds and generate corresponding HTTP headers,
* i.e. allow caching for the given number of seconds in case of a positive
* value, prevent caching if given a 0 value, do nothing else.
* Does not tell the browser to revalidate the resource.
* @param response current HTTP response
* @param cacheSeconds positive number of seconds into the future that the
* response should be cacheable for, 0 to prevent caching
*/
@SuppressWarnings("deprecation")
protected final void applyCacheSeconds(HttpServletResponse response, int cacheSeconds) {
if (this.useExpiresHeader || !this.useCacheControlHeader) {
// Deprecated HTTP 1.0 cache behavior, as in previous Spring versions
if (cacheSeconds > 0) {
cacheForSeconds(response, cacheSeconds);
}
else if (cacheSeconds == 0) {
preventCaching(response);
}
}
else {
CacheControl cControl;
if (cacheSeconds > 0) {
cControl = CacheControl.maxAge(cacheSeconds, TimeUnit.SECONDS);
if (this.alwaysMustRevalidate) {
cControl = cControl.mustRevalidate();
}
}
else if (cacheSeconds == 0) {
cControl = (this.useCacheControlNoStore ? CacheControl.noStore() : CacheControl.noCache());
}
else {
cControl = CacheControl.empty();
}
applyCacheControl(response, cControl);
}
}
private CacheControl parseCacheControl(Element element) {
CacheControl cacheControl = CacheControl.empty();
if ("true".equals(element.getAttribute("no-cache"))) {
cacheControl = CacheControl.noCache();
}
else if ("true".equals(element.getAttribute("no-store"))) {
cacheControl = CacheControl.noStore();
}
else if (element.hasAttribute("max-age")) {
cacheControl = CacheControl.maxAge(Long.parseLong(element.getAttribute("max-age")), TimeUnit.SECONDS);
}
if ("true".equals(element.getAttribute("must-revalidate"))) {
cacheControl = cacheControl.mustRevalidate();
}
if ("true".equals(element.getAttribute("no-transform"))) {
cacheControl = cacheControl.noTransform();
}
if ("true".equals(element.getAttribute("cache-public"))) {
cacheControl = cacheControl.cachePublic();
}
if ("true".equals(element.getAttribute("cache-private"))) {
cacheControl = cacheControl.cachePrivate();
}
if ("true".equals(element.getAttribute("proxy-revalidate"))) {
cacheControl = cacheControl.proxyRevalidate();
}
if (element.hasAttribute("s-maxage")) {
cacheControl = cacheControl.sMaxAge(Long.parseLong(element.getAttribute("s-maxage")), TimeUnit.SECONDS);
}
if (element.hasAttribute("stale-while-revalidate")) {
cacheControl = cacheControl.staleWhileRevalidate(
Long.parseLong(element.getAttribute("stale-while-revalidate")), TimeUnit.SECONDS);
}
if (element.hasAttribute("stale-if-error")) {
cacheControl = cacheControl.staleIfError(
Long.parseLong(element.getAttribute("stale-if-error")), TimeUnit.SECONDS);
}
return cacheControl;
}
/**
* Apply the given cache seconds and generate corresponding HTTP headers,
* i.e. allow caching for the given number of seconds in case of a positive
* value, prevent caching if given a 0 value, do nothing else.
* Does not tell the browser to revalidate the resource.
* @param response current HTTP response
* @param cacheSeconds positive number of seconds into the future that the
* response should be cacheable for, 0 to prevent caching
*/
@SuppressWarnings("deprecation")
protected final void applyCacheSeconds(HttpServletResponse response, int cacheSeconds) {
if (this.useExpiresHeader || !this.useCacheControlHeader) {
// Deprecated HTTP 1.0 cache behavior, as in previous Spring versions
if (cacheSeconds > 0) {
cacheForSeconds(response, cacheSeconds);
}
else if (cacheSeconds == 0) {
preventCaching(response);
}
}
else {
CacheControl cControl;
if (cacheSeconds > 0) {
cControl = CacheControl.maxAge(cacheSeconds, TimeUnit.SECONDS);
if (this.alwaysMustRevalidate) {
cControl = cControl.mustRevalidate();
}
}
else if (cacheSeconds == 0) {
cControl = (this.useCacheControlNoStore ? CacheControl.noStore() : CacheControl.noCache());
}
else {
cControl = CacheControl.empty();
}
applyCacheControl(response, cControl);
}
}
private CacheControl parseCacheControl(Element element) {
CacheControl cacheControl = CacheControl.empty();
if ("true".equals(element.getAttribute("no-cache"))) {
cacheControl = CacheControl.noCache();
}
else if ("true".equals(element.getAttribute("no-store"))) {
cacheControl = CacheControl.noStore();
}
else if (element.hasAttribute("max-age")) {
cacheControl = CacheControl.maxAge(Long.parseLong(element.getAttribute("max-age")), TimeUnit.SECONDS);
}
if ("true".equals(element.getAttribute("must-revalidate"))) {
cacheControl = cacheControl.mustRevalidate();
}
if ("true".equals(element.getAttribute("no-transform"))) {
cacheControl = cacheControl.noTransform();
}
if ("true".equals(element.getAttribute("cache-public"))) {
cacheControl = cacheControl.cachePublic();
}
if ("true".equals(element.getAttribute("cache-private"))) {
cacheControl = cacheControl.cachePrivate();
}
if ("true".equals(element.getAttribute("proxy-revalidate"))) {
cacheControl = cacheControl.proxyRevalidate();
}
if (element.hasAttribute("s-maxage")) {
cacheControl = cacheControl.sMaxAge(Long.parseLong(element.getAttribute("s-maxage")), TimeUnit.SECONDS);
}
return cacheControl;
}
public CacheControl toCacheControl() {
if (Boolean.TRUE.equals(this.noStore)) {
return CacheControl.noStore();
}
if (Boolean.TRUE.equals(this.noCache)) {
return CacheControl.noCache();
}
if (this.maxAge != null) {
return CacheControl.maxAge(this.maxAge.getSeconds(), TimeUnit.SECONDS);
}
return CacheControl.empty();
}
private CacheControl parseCacheControl(Element element) {
CacheControl cacheControl;
if ("true".equals(element.getAttribute("no-cache"))) {
cacheControl = CacheControl.noCache();
}
else if ("true".equals(element.getAttribute("no-store"))) {
cacheControl = CacheControl.noStore();
}
else if (element.hasAttribute("max-age")) {
cacheControl = CacheControl.maxAge(Long.parseLong(element.getAttribute("max-age")), TimeUnit.SECONDS);
}
else {
cacheControl = CacheControl.empty();
}
if ("true".equals(element.getAttribute("must-revalidate"))) {
cacheControl = cacheControl.mustRevalidate();
}
if ("true".equals(element.getAttribute("no-transform"))) {
cacheControl = cacheControl.noTransform();
}
if ("true".equals(element.getAttribute("cache-public"))) {
cacheControl = cacheControl.cachePublic();
}
if ("true".equals(element.getAttribute("cache-private"))) {
cacheControl = cacheControl.cachePrivate();
}
if ("true".equals(element.getAttribute("proxy-revalidate"))) {
cacheControl = cacheControl.proxyRevalidate();
}
if (element.hasAttribute("s-maxage")) {
cacheControl = cacheControl.sMaxAge(Long.parseLong(element.getAttribute("s-maxage")), TimeUnit.SECONDS);
}
if (element.hasAttribute("stale-while-revalidate")) {
cacheControl = cacheControl.staleWhileRevalidate(
Long.parseLong(element.getAttribute("stale-while-revalidate")), TimeUnit.SECONDS);
}
if (element.hasAttribute("stale-if-error")) {
cacheControl = cacheControl.staleIfError(
Long.parseLong(element.getAttribute("stale-if-error")), TimeUnit.SECONDS);
}
return cacheControl;
}
private CacheControl parseCacheControl(Element element) {
CacheControl cacheControl;
if ("true".equals(element.getAttribute("no-cache"))) {
cacheControl = CacheControl.noCache();
}
else if ("true".equals(element.getAttribute("no-store"))) {
cacheControl = CacheControl.noStore();
}
else if (element.hasAttribute("max-age")) {
cacheControl = CacheControl.maxAge(Long.parseLong(element.getAttribute("max-age")), TimeUnit.SECONDS);
}
else {
cacheControl = CacheControl.empty();
}
if ("true".equals(element.getAttribute("must-revalidate"))) {
cacheControl = cacheControl.mustRevalidate();
}
if ("true".equals(element.getAttribute("no-transform"))) {
cacheControl = cacheControl.noTransform();
}
if ("true".equals(element.getAttribute("cache-public"))) {
cacheControl = cacheControl.cachePublic();
}
if ("true".equals(element.getAttribute("cache-private"))) {
cacheControl = cacheControl.cachePrivate();
}
if ("true".equals(element.getAttribute("proxy-revalidate"))) {
cacheControl = cacheControl.proxyRevalidate();
}
if (element.hasAttribute("s-maxage")) {
cacheControl = cacheControl.sMaxAge(Long.parseLong(element.getAttribute("s-maxage")), TimeUnit.SECONDS);
}
if (element.hasAttribute("stale-while-revalidate")) {
cacheControl = cacheControl.staleWhileRevalidate(
Long.parseLong(element.getAttribute("stale-while-revalidate")), TimeUnit.SECONDS);
}
if (element.hasAttribute("stale-if-error")) {
cacheControl = cacheControl.staleIfError(
Long.parseLong(element.getAttribute("stale-if-error")), TimeUnit.SECONDS);
}
return cacheControl;
}