Examples of org.springframework.web.servlet.FlashMap

org.springframework.web.servlet.FlashMap
A FlashMap provides a way for one request to store attributes intended for use in another. This is most commonly needed when redirecting from one URL to another -- e.g. the Post/Redirect/Get pattern. A FlashMap is saved before the redirect (typically in the session) and is made available after the redirect and removed immediately.
A FlashMap can be set up with a request path and request parameters to help identify the target request. Without this information, a FlashMap is made available to the next request, which may or may not be the intended recipient. On a redirect, the target URL is known and for example {@code org.springframework.web.servlet.view.RedirectView} has theopportunity to automatically update the current FlashMap with target URL information.
Annotated controllers will usually not use this type directly. See {@code org.springframework.web.servlet.mvc.support.RedirectAttributes}for an overview of using flash attributes in annotated controllers. @author Rossen Stoyanchev @since 3.1 @see FlashMapManager


    String targetUrl = createTargetUrl(model, request);


    targetUrl = updateTargetUrl(targetUrl, model, request, response);
    
    FlashMap flashMap = RequestContextUtils.getOutputFlashMap(request);
    if (!CollectionUtils.isEmpty(flashMap)) {
      UriComponents uriComponents = UriComponentsBuilder.fromUriString(targetUrl).build();
      flashMap.setTargetRequestPath(uriComponents.getPath());
      flashMap.addTargetRequestParams(uriComponents.getQueryParams());
    }
    
    sendRedirect(request, response, targetUrl.toString(), this.http10Compatible);
  }

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  public void requestStarted(HttpServletRequest request) {
    if (request.getAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE) != null) {
      return;
    }
    
    FlashMap inputFlashMap = lookupFlashMap(request);
    if (inputFlashMap != null) {
      request.setAttribute(INPUT_FLASH_MAP_ATTRIBUTE, Collections.unmodifiableMap(inputFlashMap));
    }


    FlashMap outputFlashMap = new FlashMap(this.hashCode());
    request.setAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE, outputFlashMap);


    removeExpiredFlashMaps(request);
  }

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    if (!result.isEmpty()) {
      Collections.sort(result);
      if (logger.isDebugEnabled()) {
        logger.debug("Found matching FlashMap(s): " + result);
      }
      FlashMap match = result.remove(0);
      allFlashMaps.remove(match);
      return match;
    }
    return null;
  }

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  /**
   * {@inheritDoc}
   * <p>An HTTP session is never created if the "output" FlashMap is empty.
   */
  public void requestCompleted(HttpServletRequest request) {
    FlashMap flashMap = (FlashMap) request.getAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE);
    if (flashMap == null) {
      throw new IllegalStateException("requestCompleted called but \"output\" FlashMap was never created");
    }
    if (!flashMap.isEmpty() && flashMap.isCreatedBy(this.hashCode())) {
      if (logger.isDebugEnabled()) {
        logger.debug("Saving FlashMap=" + flashMap);
      }
      onSaveFlashMap(flashMap, request);
      retrieveFlashMaps(request, true).add(flashMap);

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      logger.debug("Retrieved FlashMap(s): " + maps);
    }


    List<FlashMap> mapsToRemove = getExpiredFlashMaps(maps);


    FlashMap match = getMatchingFlashMap(maps, request);
    if (match != null) {
      mapsToRemove.add(match);
    }


    if (!mapsToRemove.isEmpty()) {

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      throws IOException {


    String targetUrl = createTargetUrl(model, request);
    targetUrl = updateTargetUrl(targetUrl, model, request, response);
    
    FlashMap flashMap = RequestContextUtils.getOutputFlashMap(request);
    if (!CollectionUtils.isEmpty(flashMap)) {
      UriComponents uriComponents = UriComponentsBuilder.fromUriString(targetUrl).build();
      flashMap.setTargetRequestPath(uriComponents.getPath());
      flashMap.addTargetRequestParams(uriComponents.getQueryParams());
    }


    FlashMapManager flashMapManager = RequestContextUtils.getFlashMapManager(request);
    flashMapManager.saveOutputFlashMap(flashMap, request, response);

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  @Test
  public void flashAttribute() throws Exception {
    this.builder.flashAttr("foo", "bar");
    MockHttpServletRequest request = this.builder.buildRequest(this.servletContext);


    FlashMap flashMap = new SessionFlashMapManager().retrieveAndUpdate(request, null);
    assertNotNull(flashMap);
    assertEquals("bar", flashMap.get("foo"));
  }

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    for (String name : this.sessionAttributes.keySet()) {
      request.getSession().setAttribute(name, this.sessionAttributes.get(name));
    }


    FlashMap flashMap = new FlashMap();
    flashMap.putAll(this.flashAttributes);


    FlashMapManager flashMapManager = getFlashMapManager(request);
    flashMapManager.saveOutputFlashMap(flashMap, request, new MockHttpServletResponse());


    // Apply post-processors at the very end

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  public void attribute_incorrectValue() throws Exception {
    new FlashAttributeResultMatchers().attribute("good", "not good").match(getStubMvcResult());
  }


  private StubMvcResult getStubMvcResult() {
    FlashMap flashMap = new FlashMap();
    flashMap.put("good", "good");
    StubMvcResult mvcResult = new StubMvcResult(null, null, null, null, null, flashMap, null);
    return mvcResult;
  }

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    assertValue("FlashMap", "Type", null);
  }


  @Test
  public void testFlashMap() throws Exception {
    FlashMap flashMap = new FlashMap();
    flashMap.put("attrName", "attrValue");
    this.request.setAttribute(DispatcherServlet.class.getName() + ".OUTPUT_FLASH_MAP", flashMap);


    this.handler.handle(this.mvcResult);


    assertValue("FlashMap", "Attribute", "attrName");

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