javax.servlet.ServletContext.getNamedDispatcher()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中javax.servlet.ServletContext.getNamedDispatcher()方法的一些代码示例，展示了ServletContext.getNamedDispatcher()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。ServletContext.getNamedDispatcher()方法的具体详情如下：
包路径：javax.servlet.ServletContext
类名称：ServletContext
方法名：getNamedDispatcher

ServletContext.getNamedDispatcher介绍

[英]Returns a RequestDispatcher object that acts as a wrapper for the named servlet.

Servlets (and JSP pages also) may be given names via server administration or via a web application deployment descriptor. A servlet instance can determine its name using ServletConfig#getServletName.

This method returns null if the ServletContext cannot return a RequestDispatcher for any reason.
[中]

代码示例

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

@Override
public void handleRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
  Assert.state(this.servletContext != null, "No ServletContext set");
  RequestDispatcher rd = this.servletContext.getNamedDispatcher(this.defaultServletName);
  if (rd == null) {
    throw new IllegalStateException("A RequestDispatcher could not be located for the default servlet '" +
        this.defaultServletName + "'");
  }
  rd.forward(request, response);
}

代码示例来源：origin: igniterealtime/Openfire

@Override
public RequestDispatcher getNamedDispatcher( String s )
{
  return proxy.getNamedDispatcher( s );
}

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

/**
 * If the {@code defaultServletName} property has not been explicitly set,
 * attempts to locate the default Servlet using the known common
 * container-specific names.
 */
@Override
public void setServletContext(ServletContext servletContext) {
  this.servletContext = servletContext;
  if (!StringUtils.hasText(this.defaultServletName)) {
    if (this.servletContext.getNamedDispatcher(COMMON_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = COMMON_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(GAE_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = GAE_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(RESIN_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = RESIN_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(WEBLOGIC_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = WEBLOGIC_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(WEBSPHERE_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = WEBSPHERE_DEFAULT_SERVLET_NAME;
    }
    else {
      throw new IllegalStateException("Unable to locate the default servlet for serving static content. " +
          "Please set the 'defaultServletName' property explicitly.");
    }
  }
}

代码示例来源：origin: oblac/jodd

/**
 * Include named resource.
 */
public static boolean includeNamed(final ServletContext context, final ServletRequest request, final ServletResponse response, final String page) throws IOException, ServletException {
  RequestDispatcher dispatcher = context.getNamedDispatcher(page);
  if (dispatcher != null) {
    dispatcher.include(request, response);
    return true;
  }
  return false;
}

代码示例来源：origin: oblac/jodd

/**
 * Forward to named resource.
 */
public static boolean forwardNamed(final ServletContext context, final ServletRequest request, final ServletResponse response, final String resource) throws IOException, ServletException {
  RequestDispatcher dispatcher = context.getNamedDispatcher(resource);
  if (dispatcher != null) {
    dispatcher.forward(request, response);
    return true;
  }
  return false;
}

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

@Override
public void handleRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
  Assert.state(this.servletContext != null, "No ServletContext set");
  RequestDispatcher rd = this.servletContext.getNamedDispatcher(this.defaultServletName);
  if (rd == null) {
    throw new IllegalStateException("A RequestDispatcher could not be located for the default servlet '" +
        this.defaultServletName + "'");
  }
  rd.forward(request, response);
}

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

/**
 * If the {@code defaultServletName} property has not been explicitly set,
 * attempts to locate the default Servlet using the known common
 * container-specific names.
 */
@Override
public void setServletContext(ServletContext servletContext) {
  this.servletContext = servletContext;
  if (!StringUtils.hasText(this.defaultServletName)) {
    if (this.servletContext.getNamedDispatcher(COMMON_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = COMMON_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(GAE_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = GAE_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(RESIN_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = RESIN_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(WEBLOGIC_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = WEBLOGIC_DEFAULT_SERVLET_NAME;
    }
    else if (this.servletContext.getNamedDispatcher(WEBSPHERE_DEFAULT_SERVLET_NAME) != null) {
      this.defaultServletName = WEBSPHERE_DEFAULT_SERVLET_NAME;
    }
    else {
      throw new IllegalStateException("Unable to locate the default servlet for serving static content. " +
          "Please set the 'defaultServletName' property explicitly.");
    }
  }
}

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

@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
    throws Exception {
  ServletContext servletContext = getServletContext();
  Assert.state(servletContext != null, "No ServletContext");
  RequestDispatcher rd = servletContext.getNamedDispatcher(this.servletName);
  if (rd == null) {
    throw new ServletException("No servlet with name '" + this.servletName + "' defined in web.xml");
  }
  // If already included, include again, else forward.
  if (useInclude(request, response)) {
    rd.include(request, response);
    if (logger.isTraceEnabled()) {
      logger.trace("Included servlet [" + this.servletName +
          "] in ServletForwardingController '" + this.beanName + "'");
    }
  }
  else {
    rd.forward(request, response);
    if (logger.isTraceEnabled()) {
      logger.trace("Forwarded to servlet [" + this.servletName +
          "] in ServletForwardingController '" + this.beanName + "'");
    }
  }
  return null;
}

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

@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
    throws Exception {
  ServletContext servletContext = getServletContext();
  Assert.state(servletContext != null, "No ServletContext");
  RequestDispatcher rd = servletContext.getNamedDispatcher(this.servletName);
  if (rd == null) {
    throw new ServletException("No servlet with name '" + this.servletName + "' defined in web.xml");
  }
  // If already included, include again, else forward.
  if (useInclude(request, response)) {
    rd.include(request, response);
    if (logger.isTraceEnabled()) {
      logger.trace("Included servlet [" + this.servletName +
          "] in ServletForwardingController '" + this.beanName + "'");
    }
  }
  else {
    rd.forward(request, response);
    if (logger.isTraceEnabled()) {
      logger.trace("Forwarded to servlet [" + this.servletName +
          "] in ServletForwardingController '" + this.beanName + "'");
    }
  }
  return null;
}

代码示例来源：origin: Atmosphere/atmosphere

servlet.service(request, response);
} else {
  RequestDispatcher rd = configImpl.getServletContext().getNamedDispatcher("default");
  if (rd == null) {
    throw new ServletException("No Servlet Found");

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

private void doTestServletForwardingController(ServletForwardingController sfc, boolean include)
    throws Exception {
  HttpServletRequest request = mock(HttpServletRequest.class);
  HttpServletResponse response = mock(HttpServletResponse.class);
  ServletContext context = mock(ServletContext.class);
  RequestDispatcher dispatcher = mock(RequestDispatcher.class);
  given(request.getMethod()).willReturn("GET");
  given(context.getNamedDispatcher("action")).willReturn(dispatcher);
  if (include) {
    given(request.getAttribute(WebUtils.INCLUDE_REQUEST_URI_ATTRIBUTE)).willReturn("somePath");
  }
  else {
    given(request.getAttribute(WebUtils.INCLUDE_REQUEST_URI_ATTRIBUTE)).willReturn(null);
  }
  StaticWebApplicationContext sac = new StaticWebApplicationContext();
  sac.setServletContext(context);
  sfc.setApplicationContext(sac);
  assertNull(sfc.handleRequest(request, response));
  if (include) {
    verify(dispatcher).include(request, response);
  }
  else {
    verify(dispatcher).forward(request, response);
  }
}

代码示例来源：origin: b3log/latke

/**
 * Public construct with specified servlet context.
 *
 * @param servletContext the specified servlet context
 */
public StaticResourceHandler(final ServletContext servletContext) {
  for (final String servletName : OPTION_SERVLET_NAME) {
    requestDispatcher = servletContext.getNamedDispatcher(servletName);
    if (null != requestDispatcher) {
      defaultServletName = servletName;
      break;
    }
  }
  if (null == requestDispatcher) {
    throw new IllegalStateException(
        "Unable to locate the default servlet for serving static content. "
            + "Please report this issue on https://github.com/b3log/latke/issues/new");
  }
  LOGGER.log(Level.DEBUG, "The default servlet for serving static resource is [{0}]", defaultServletName);
}

代码示例来源：origin: opensourceBIM/BIMserver

protected void redirect(HttpServletRequest request, HttpServletResponse response, String pathInfo) throws ServletException {
  String theServletPath = dispatcherServletPath == null ? "/" : dispatcherServletPath;
  ServletContext sc = super.getServletContext();
  RequestDispatcher rd = dispatcherServletName != null ? sc.getNamedDispatcher(dispatcherServletName) : sc.getRequestDispatcher(theServletPath + pathInfo);
  if (rd == null) {
    throw new ServletException("No RequestDispatcher can be created for path " + pathInfo);
  }
  try {
    HttpServletRequestFilter servletRequest = new HttpServletRequestFilter(request, pathInfo, theServletPath);
    rd.forward(servletRequest, response);
  } catch (Throwable ex) {
    throw new ServletException("RequestDispatcher for path " + pathInfo + " has failed");
  }
}

代码示例来源：origin: org.apache.cxf/cxf-rt-transports-http

protected void redirect(HttpServletRequest request, HttpServletResponse response, String pathInfo)
  throws ServletException {
  boolean customServletPath = dispatcherServletPath != null;
  String theServletPath = customServletPath ? dispatcherServletPath : "/";
  ServletContext sc = super.getServletContext();
  RequestDispatcher rd = dispatcherServletName != null
    ? sc.getNamedDispatcher(dispatcherServletName)
    : sc.getRequestDispatcher((theServletPath + pathInfo).replace("//", "/"));
  if (rd == null) {
    String errorMessage = "No RequestDispatcher can be created for path " + pathInfo;
    if (dispatcherServletName != null) {
      errorMessage += ", dispatcher name: " + dispatcherServletName;
    }
    throw new ServletException(errorMessage);
  }
  try {
    for (Map.Entry<String, String> entry : redirectAttributes.entrySet()) {
      request.setAttribute(entry.getKey(), entry.getValue());
    }
    HttpServletRequest servletRequest =
      new HttpServletRequestRedirectFilter(request, pathInfo, theServletPath, customServletPath);
    if (PropertyUtils.isTrue(getServletConfig().getInitParameter(REDIRECT_WITH_INCLUDE_PARAMETER))) {
      rd.include(servletRequest, response);
    } else {
      rd.forward(servletRequest, response);
    }
  } catch (Throwable ex) {
    throw new ServletException("RequestDispatcher for path " + pathInfo + " has failed", ex);
  }
}

代码示例来源：origin: org.apache.felix/org.apache.felix.http.base

@Override
public RequestDispatcher getNamedDispatcher(String name)
{
  return delegatee.getNamedDispatcher(name);
}

代码示例来源：origin: apache/felix

@Override
public RequestDispatcher getNamedDispatcher(String name)
{
  return delegatee.getNamedDispatcher(name);
}

代码示例来源：origin: io.joynr.java.messaging/servlet-common

@Override
  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    try {
      RequestDispatcher requestDispatcher = getServletContext().getNamedDispatcher("default");
      requestDispatcher.forward(req, resp);
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
    }
  }
}

代码示例来源：origin: org.apache.hadoop/hadoop-yarn-common

@Private
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
 RequestDispatcher rd = getServletContext().getNamedDispatcher("default");

 HttpServletRequest wrapped = new HttpServletRequestWrapper(req) {
  public String getServletPath() {
  return "";
  }
 };

 rd.forward(wrapped, resp);
 }

代码示例来源：origin: com.github.jiayuhan-it/hadoop-yarn-common

@Private
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
 RequestDispatcher rd = getServletContext().getNamedDispatcher("default");

 HttpServletRequest wrapped = new HttpServletRequestWrapper(req) {
  public String getServletPath() {
  return "";
  }
 };

 rd.forward(wrapped, resp);
 }

代码示例来源：origin: apache/cxf

protected RequestDispatcher getRequestDispatcher(ServletContext sc, Class<?> clazz, String path) {
  RequestDispatcher rd = dispatcherName != null ? sc.getNamedDispatcher(dispatcherName)
                         : sc.getRequestDispatcher(path);
  if (rd == null) {
    String message =
      new org.apache.cxf.common.i18n.Message("RESOURCE_PATH_NOT_FOUND",
                          BUNDLE, path).toString();
    LOG.severe(message);
    throw ExceptionUtils.toInternalServerErrorException(null, null);
  }
  return rd;
}

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