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

    this.response = new MockHttpServletResponse();
  }


  @Test
  public void retrieveAndUpdateMatchByPath() {
    FlashMap flashMap = new FlashMap();
    flashMap.put("key", "value");
    flashMap.setTargetRequestPath("/path");


    this.flashMapManager.setFlashMaps(flashMap);


    this.request.setRequestURI("/path");
    FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);


    assertEquals(flashMap, inputFlashMap);
  }

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  // SPR-8779


  @Test
  public void retrieveAndUpdateMatchByOriginatingPath() {
    FlashMap flashMap = new FlashMap();
    flashMap.put("key", "value");
    flashMap.setTargetRequestPath("/accounts");


    this.flashMapManager.setFlashMaps(flashMap);


    this.request.setAttribute(WebUtils.FORWARD_REQUEST_URI_ATTRIBUTE, "/accounts");
    this.request.setRequestURI("/mvc/accounts");
    FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);


    assertEquals(flashMap, inputFlashMap);
    assertEquals("Input FlashMap should have been removed", 0, this.flashMapManager.getFlashMaps().size());
  }

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    assertEquals("Input FlashMap should have been removed", 0, this.flashMapManager.getFlashMaps().size());
  }


  @Test
  public void retrieveAndUpdateMatchWithTrailingSlash() {
    FlashMap flashMap = new FlashMap();
    flashMap.put("key", "value");
    flashMap.setTargetRequestPath("/path");


    this.flashMapManager.setFlashMaps(flashMap);


    this.request.setRequestURI("/path/");
    FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);


    assertEquals(flashMap, inputFlashMap);
    assertEquals("Input FlashMap should have been removed", 0, this.flashMapManager.getFlashMaps().size());
  }

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    assertEquals("Input FlashMap should have been removed", 0, this.flashMapManager.getFlashMaps().size());
  }


  @Test
  public void retrieveAndUpdateMatchByParams() {
    FlashMap flashMap = new FlashMap();
    flashMap.put("key", "value");
    flashMap.addTargetRequestParam("number", "one");


    this.flashMapManager.setFlashMaps(flashMap);


    this.request.setParameter("number", (String) null);
    FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);


    assertNull(inputFlashMap);
    assertEquals("FlashMap should not have been removed", 1, this.flashMapManager.getFlashMaps().size());


    this.request.setParameter("number", "two");

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  // SPR-8798


  @Test
  public void retrieveAndUpdateMatchWithMultiValueParam() {
    FlashMap flashMap = new FlashMap();
    flashMap.put("name", "value");
    flashMap.addTargetRequestParam("id", "1");
    flashMap.addTargetRequestParam("id", "2");


    this.flashMapManager.setFlashMaps(flashMap);


    this.request.setParameter("id", "1");
    FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);


    assertNull(inputFlashMap);
    assertEquals("FlashMap should not have been removed", 1, this.flashMapManager.getFlashMaps().size());


    this.request.addParameter("id", "2");

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    assertEquals("Input FlashMap should have been removed", 0, this.flashMapManager.getFlashMaps().size());
  }


  @Test
  public void retrieveAndUpdateSortMultipleMatches() {
    FlashMap emptyFlashMap = new FlashMap();


    FlashMap flashMapOne = new FlashMap();
    flashMapOne.put("key1", "value1");
    flashMapOne.setTargetRequestPath("/one");


    FlashMap flashMapTwo = new FlashMap();
    flashMapTwo.put("key1", "value1");
    flashMapTwo.put("key2", "value2");
    flashMapTwo.setTargetRequestPath("/one/two");


    this.flashMapManager.setFlashMaps(emptyFlashMap, flashMapOne, flashMapTwo);


    this.request.setRequestURI("/one/two");
    FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);


    assertEquals(flashMapTwo, inputFlashMap);
    assertEquals("Input FlashMap should have been removed", 2, this.flashMapManager.getFlashMaps().size());
  }

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  @Test
  public void retrieveAndUpdateRemoveExpired() throws InterruptedException {
    List<FlashMap> flashMaps = new ArrayList<FlashMap>();
    for (int i=0; i < 5; i++) {
      FlashMap expiredFlashMap = new FlashMap();
      expiredFlashMap.startExpirationPeriod(-1);
      flashMaps.add(expiredFlashMap);
    }
    this.flashMapManager.setFlashMaps(flashMaps);
    this.flashMapManager.retrieveAndUpdate(this.request, this.response);

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        0, this.flashMapManager.getFlashMaps().size());
  }


  @Test
  public void saveOutputFlashMapEmpty() throws InterruptedException {
    FlashMap flashMap = new FlashMap();


    this.flashMapManager.saveOutputFlashMap(flashMap, this.request, this.response);
    List<FlashMap> allMaps = this.flashMapManager.getFlashMaps();


    assertNull(allMaps);

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    assertNull(allMaps);
  }


  @Test
  public void saveOutputFlashMap() throws InterruptedException {
    FlashMap flashMap = new FlashMap();
    flashMap.put("name", "value");


    this.flashMapManager.setFlashMapTimeout(-1); // expire immediately so we can check expiration started
    this.flashMapManager.saveOutputFlashMap(flashMap, this.request, this.response);
    List<FlashMap> allMaps = this.flashMapManager.getFlashMaps();


    assertNotNull(allMaps);
    assertSame(flashMap, allMaps.get(0));
    assertTrue(flashMap.isExpired());
  }

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    assertTrue(flashMap.isExpired());
  }


  @Test
  public void saveOutputFlashMapDecodeTargetPath() throws InterruptedException {
    FlashMap flashMap = new FlashMap();
    flashMap.put("key", "value");


    flashMap.setTargetRequestPath("/once%20upon%20a%20time");
    this.flashMapManager.saveOutputFlashMap(flashMap, this.request, this.response);


    assertEquals("/once upon a time", flashMap.getTargetRequestPath());
  }

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