javax.servlet.ServletRequest.getAttribute()方法的使用及代码示例

本文整理了Java中javax.servlet.ServletRequest.getAttribute()方法的一些代码示例，展示了ServletRequest.getAttribute()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ServletRequest.getAttribute()方法的具体详情如下：
包路径：javax.servlet.ServletRequest
类名称：ServletRequest
方法名：getAttribute

ServletRequest.getAttribute介绍

[英]Returns the value of the named attribute as an Object, or null if no attribute of the given name exists.

Attributes can be set two ways. The servlet container may set attributes to make available custom information about a request. For example, for requests made using HTTPS, the attribute javax.servlet.request.X509Certificate can be used to retrieve information on the certificate of the client. Attributes can also be set programatically using ServletRequest#setAttribute. This allows information to be embedded into a request before a RequestDispatcher call.

Attribute names should follow the same conventions as package names. This specification reserves names matching java.*, javax.*, and sun.*.
[中]以Object或null的形式返回命名属性的值（如果不存在给定名称的属性）。
属性可以通过两种方式设置。servlet容器可以设置属性，以提供有关请求的自定义信息。例如，对于使用HTTPS发出的请求，属性javax.servlet.request.X509Certificate可用于检索有关客户端证书的信息。还可以使用ServletRequest#setAttribute通过编程设置属性。这允许在RequestDispatcher调用之前将信息嵌入到请求中。
属性名称应遵循与包名称相同的约定。此规范保留与java.*、javax.*和sun.*匹配的名称。

代码示例

代码示例来源：origin: spring-projects/spring-framework

/**
* Expose the specified request attribute if not already present.
* @param request current servlet request
* @param name the name of the attribute
* @param value the suggested value of the attribute
*/
private static void exposeRequestAttributeIfNotPresent(ServletRequest request, String name, Object value) {
if (request.getAttribute(name) == null) {
request.setAttribute(name, value);
}
}

代码示例来源：origin: org.springframework/spring-web

/**
* Expose the specified request attribute if not already present.
* @param request current servlet request
* @param name the name of the attribute
* @param value the suggested value of the attribute
*/
private static void exposeRequestAttributeIfNotPresent(ServletRequest request, String name, Object value) {
if (request.getAttribute(name) == null) {
request.setAttribute(name, value);
}
}

代码示例来源：origin: spring-projects/spring-framework

/**
* Obtain the {@link WebAsyncManager} for the current request, or if not
* found, create and associate it with the request.
*/
public static WebAsyncManager getAsyncManager(ServletRequest servletRequest) {
WebAsyncManager asyncManager = null;
Object asyncManagerAttr = servletRequest.getAttribute(WEB_ASYNC_MANAGER_ATTRIBUTE);
if (asyncManagerAttr instanceof WebAsyncManager) {
asyncManager = (WebAsyncManager) asyncManagerAttr;
}
if (asyncManager == null) {
asyncManager = new WebAsyncManager();
servletRequest.setAttribute(WEB_ASYNC_MANAGER_ATTRIBUTE, asyncManager);
}
return asyncManager;
}

代码示例来源：origin: org.springframework/spring-web

/**
* Obtain the {@link WebAsyncManager} for the current request, or if not
* found, create and associate it with the request.
*/
public static WebAsyncManager getAsyncManager(ServletRequest servletRequest) {
WebAsyncManager asyncManager = null;
Object asyncManagerAttr = servletRequest.getAttribute(WEB_ASYNC_MANAGER_ATTRIBUTE);
if (asyncManagerAttr instanceof WebAsyncManager) {
asyncManager = (WebAsyncManager) asyncManagerAttr;
}
if (asyncManager == null) {
asyncManager = new WebAsyncManager();
servletRequest.setAttribute(WEB_ASYNC_MANAGER_ATTRIBUTE, asyncManager);
}
return asyncManager;
}

代码示例来源：origin: jersey/jersey

@Override
public void forward(final ServletRequest request, final ServletResponse response) throws ServletException, IOException {
final Object oldIt = request.getAttribute(MODEL_ATTRIBUTE_NAME);
final Object oldResolvingClass = request.getAttribute(RESOLVING_CLASS_ATTRIBUTE_NAME);
request.setAttribute(RESOLVING_CLASS_ATTRIBUTE_NAME, viewable.getResolvingClass());
request.setAttribute(OLD_MODEL_ATTRIBUTE_NAME, viewable.getModel());
request.setAttribute(MODEL_ATTRIBUTE_NAME, viewable.getModel());
request.setAttribute(BASE_PATH_ATTRIBUTE_NAME, basePath);
request.setAttribute(REQUEST_ATTRIBUTE_NAME, request);
request.setAttribute(RESPONSE_ATTRIBUTE_NAME, response);
dispatcher.forward(request, response);
request.setAttribute(RESOLVING_CLASS_ATTRIBUTE_NAME, oldResolvingClass);
request.setAttribute(MODEL_ATTRIBUTE_NAME, oldIt);
}

代码示例来源：origin: jenkinsci/jenkins

/**
* Get a crumb value based on user specific information in the request.
* @param request
*/
public String getCrumb(ServletRequest request) {
String crumb = null;
if (request != null) {
crumb = (String) request.getAttribute(CRUMB_ATTRIBUTE);
}
if (crumb == null) {
crumb = issueCrumb(request, getDescriptor().getCrumbSalt());
if (request != null) {
if ((crumb != null) && crumb.length()>0) {
request.setAttribute(CRUMB_ATTRIBUTE, crumb);
} else {
request.removeAttribute(CRUMB_ATTRIBUTE);
}
}
}
return crumb;
}

代码示例来源：origin: spring-projects/spring-framework

boolean hasAlreadyFilteredAttribute = request.getAttribute(alreadyFilteredAttributeName) != null;
request.setAttribute(alreadyFilteredAttributeName, Boolean.TRUE);
try {
doFilterInternal(httpRequest, httpResponse, filterChain);

代码示例来源：origin: apache/incubator-druid

if (request.getAttribute(AuthConfig.DRUID_AUTHENTICATION_RESULT) != null) {
filterChain.doFilter(request, response);
return;
request.setAttribute(
AuthConfig.DRUID_AUTHENTICATION_RESULT,
new AuthenticationResult(clientPrincipal, authorizerName, name, null)

代码示例来源：origin: spring-projects/spring-session

HttpServletResponse httpRespOnse= (HttpServletResponse) response;
boolean hasAlreadyFilteredAttribute = request
.getAttribute(this.alreadyFilteredAttributeName) != null;
request.setAttribute(this.alreadyFilteredAttributeName, Boolean.TRUE);
try {
doFilterInternal(httpRequest, httpResponse, filterChain);

代码示例来源：origin: geoserver/geoserver

(AuthenticationCachingFilter) GeoServerCompositeFilter.this,
(HttpServletRequest) request);
if (cacheKey != null) request.setAttribute(CACHE_KEY_ATTRIBUTE, cacheKey);
Authentication postAuthentication =
SecurityContextHolder.getContext().getAuthentication();
String cacheKey = (String) request.getAttribute(CACHE_KEY_ATTRIBUTE);
if (postAuthentication != null && cacheKey != null) {
Integer idleSecs = (Integer) request.getAttribute(CACHE_KEY_IDLE_SECS);
Integer liveSecs = (Integer) request.getAttribute(CACHE_KEY_LIVE_SECS);
request.setAttribute(CACHE_KEY_ATTRIBUTE, null);
request.setAttribute(CACHE_KEY_IDLE_SECS, null);
request.setAttribute(CACHE_KEY_LIVE_SECS, null);

代码示例来源：origin: org.springframework/spring-web

boolean hasAlreadyFilteredAttribute = request.getAttribute(alreadyFilteredAttributeName) != null;
request.setAttribute(alreadyFilteredAttributeName, Boolean.TRUE);
try {
doFilterInternal(httpRequest, httpResponse, filterChain);

代码示例来源：origin: cloudfoundry/uaa

}catch (Exception x) {
logger.error("Uncaught Exception:", x);
if (req.getAttribute("javax.servlet.error.exception") == null) {
req.setAttribute("javax.servlet.error.exception", x);

代码示例来源：origin: apache/shiro

throws ServletException, IOException {
String alreadyFilteredAttributeName = getAlreadyFilteredAttributeName();
if ( request.getAttribute(alreadyFilteredAttributeName) != null ) {
log.trace("Filter '{}' already executed. Proceeding without invoking this filter.", getName());
filterChain.doFilter(request, response);
request.setAttribute(alreadyFilteredAttributeName, Boolean.TRUE);

代码示例来源：origin: openzipkin/brave

TraceContext cOntext= (TraceContext) request.getAttribute(TraceContext.class.getName());
if (context != null) {
request.setAttribute(SpanCustomizer.class.getName(), span.customizer());
request.setAttribute(TraceContext.class.getName(), span.context());

代码示例来源：origin: nutzam/nutz

Integer mark = (Integer) req.getAttribute(markKey);
if (mark != null) {
req.setAttribute(markKey, mark+1);
} else {
req.setAttribute(markKey, 0);
req.removeAttribute(markKey);
} else {
req.setAttribute(markKey, mark - 1);

代码示例来源：origin: haraldk/TwelveMonkeys

/**
* If request is filtered, returns true, otherwise marks request as filtered
* and returns false.
* A return value of false, indicates that the filter has not yet run.
* A return value of true, indicates that the filter has run for this
* request, and processing should not continue.
*


* Note that the method will mark the request as filtered on first
* invocation.
*


* @see #ATTRIB_RUN_ONCE_EXT
* @see #ATTRIB_RUN_ONCE_VALUE
*
* @param pRequest the servlet request
* @return {@code true} if the request is already filtered, otherwise
* {@code false}.
*/
private boolean isRunOnce(final ServletRequest pRequest) {
// If request already filtered, return true (skip)
if (pRequest.getAttribute(attribRunOnce) == ATTRIB_RUN_ONCE_VALUE) {
return true;
}
// Set attribute and return false (continue)
pRequest.setAttribute(attribRunOnce, ATTRIB_RUN_ONCE_VALUE);
return false;
}

代码示例来源：origin: org.apache.logging.log4j/log4j-web

@Override
public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
throws IOException, ServletException {
if (request.getAttribute(ALREADY_FILTERED_ATTRIBUTE) != null) {
chain.doFilter(request, response);
} else {
request.setAttribute(ALREADY_FILTERED_ATTRIBUTE, Boolean.TRUE);
try {
this.initializer.setLoggerContext();
chain.doFilter(request, response);
} finally {
this.initializer.clearLoggerContext();
}
}
}

代码示例来源：origin: awslabs/aws-serverless-java-container

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
Object apiGwCOntext= servletRequest.getAttribute(RequestReader.API_GATEWAY_CONTEXT_PROPERTY);
if (apiGwCOntext== null) {
log.warn("API Gateway context is null");
filterChain.doFilter(servletRequest, servletResponse);
}
if (!AwsProxyRequestContext.class.isAssignableFrom(apiGwContext.getClass())) {
log.warn("API Gateway context object is not of valid type");
filterChain.doFilter(servletRequest, servletResponse);
}
AwsProxyRequestContext ctx = (AwsProxyRequestContext)apiGwContext;
if (ctx.getIdentity() == null) {
log.warn("Identity context is null");
filterChain.doFilter(servletRequest, servletResponse);
}
String cognitoIdentityId = ctx.getIdentity().getCognitoIdentityId();
if (cognitoIdentityId == null || "".equals(cognitoIdentityId.trim())) {
log.warn("Cognito identity id in request is null");
}
servletRequest.setAttribute(COGNITO_IDENTITY_ATTRIBUTE, cognitoIdentityId);
filterChain.doFilter(servletRequest, servletResponse);
}

代码示例来源：origin: awslabs/aws-serverless-java-container

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
Object apiGwCOntext= servletRequest.getAttribute(RequestReader.API_GATEWAY_CONTEXT_PROPERTY);
if (apiGwCOntext== null) {
log.warn("API Gateway context is null");
filterChain.doFilter(servletRequest, servletResponse);
}
if (!AwsProxyRequestContext.class.isAssignableFrom(apiGwContext.getClass())) {
log.warn("API Gateway context object is not of valid type");
filterChain.doFilter(servletRequest, servletResponse);
}
AwsProxyRequestContext ctx = (AwsProxyRequestContext)apiGwContext;
if (ctx.getIdentity() == null) {
log.warn("Identity context is null");
filterChain.doFilter(servletRequest, servletResponse);
}
String cognitoIdentityId = ctx.getIdentity().getCognitoIdentityId();
if (cognitoIdentityId == null || "".equals(cognitoIdentityId.trim())) {
log.warn("Cognito identity id in request is null");
}
servletRequest.setAttribute(COGNITO_IDENTITY_ATTRIBUTE, cognitoIdentityId);
filterChain.doFilter(servletRequest, servletResponse);
}

代码示例来源：origin: awslabs/aws-serverless-java-container

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
Object apiGwCOntext= servletRequest.getAttribute(RequestReader.API_GATEWAY_CONTEXT_PROPERTY);
if (apiGwCOntext== null) {
log.warn("API Gateway context is null");
filterChain.doFilter(servletRequest, servletResponse);
}
if (!AwsProxyRequestContext.class.isAssignableFrom(apiGwContext.getClass())) {
log.warn("API Gateway context object is not of valid type");
filterChain.doFilter(servletRequest, servletResponse);
}
AwsProxyRequestContext ctx = (AwsProxyRequestContext)apiGwContext;
if (ctx.getIdentity() == null) {
log.warn("Identity context is null");
filterChain.doFilter(servletRequest, servletResponse);
}
String cognitoIdentityId = ctx.getIdentity().getCognitoIdentityId();
if (cognitoIdentityId == null || "".equals(cognitoIdentityId.trim())) {
log.warn("Cognito identity id in request is null");
}
servletRequest.setAttribute(COGNITO_IDENTITY_ATTRIBUTE, cognitoIdentityId);
filterChain.doFilter(servletRequest, servletResponse);
}