Examples of org.springframework.web.bind.WebDataBinder

org.springframework.web.bind.WebDataBinder
Special {@link DataBinder} for data binding from web request parametersto JavaBean objects. Designed for web environments, but not dependent on the Servlet API; serves as base class for more specific DataBinder variants, such as {@link org.springframework.web.bind.ServletRequestDataBinder}.
Includes support for field markers which address a common problem with HTML checkboxes and select options: detecting that a field was part of the form, but did not generate a request parameter because it was empty. A field marker allows to detect that state and reset the corresponding bean property accordingly. Default values, for parameters that are otherwise not present, can specify a value for the field other then empty. @author Juergen Hoeller @author Scott Andrews @since 1.2 @see #registerCustomEditor @see #setAllowedFields @see #setRequiredFields @see #setFieldMarkerPrefix @see #setFieldDefaultPrefix @see ServletRequestDataBinder

  public void createBinderTypeConversion() throws Exception {
    webRequest.getNativeRequest(MockHttpServletRequest.class).setParameter("requestParam", "22");
    argumentResolvers.addResolver(new RequestParamMethodArgumentResolver(null, false));


    WebDataBinderFactory factory = createBinderFactory("initBinderTypeConversion", WebDataBinder.class, int.class);
    WebDataBinder dataBinder = factory.createBinder(webRequest, null, "foo");


    assertNotNull(dataBinder.getDisallowedFields());
    assertEquals("requestParam-22", dataBinder.getDisallowedFields()[0]);
  }

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  // SPR-10578


  @Test
  public void missingRequestParamEmptyValueConvertedToNull() throws Exception {


    WebDataBinder binder = new WebRequestDataBinder(null);
    binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));


    WebDataBinderFactory binderFactory = mock(WebDataBinderFactory.class);
    given(binderFactory.createBinder(webRequest, null, "stringNotAnnot")).willReturn(binder);


    this.request.addParameter("stringNotAnnot", "");

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  }


  @Test
  public void missingRequestParamEmptyValueNotRequired() throws Exception {


    WebDataBinder binder = new WebRequestDataBinder(null);
    binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));


    WebDataBinderFactory binderFactory = mock(WebDataBinderFactory.class);
    given(binderFactory.createBinder(webRequest, null, "name")).willReturn(binder);


    this.request.addParameter("name", "");

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    @Override
    public WebDataBinder createBinder(NativeWebRequest webRequest, Object target, String objectName) {
      LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
      validator.afterPropertiesSet();
      WebDataBinder dataBinder = new WebDataBinder(target, objectName);
      dataBinder.setValidator(validator);
      return dataBinder;
    }

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  private final class ValidatingBinderFactory implements WebDataBinderFactory {
    @Override
    public WebDataBinder createBinder(NativeWebRequest webRequest, Object target, String objectName) throws Exception {
      LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
      validator.afterPropertiesSet();
      WebDataBinder dataBinder = new WebDataBinder(target, objectName);
      dataBinder.setValidator(validator);
      return dataBinder;
    }

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    uriTemplateVars.put("name", "nameValue");
    uriTemplateVars.put("age", "25");
    request.setAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, uriTemplateVars);


    TestBean target = new TestBean();
    WebDataBinder binder = new ExtendedServletRequestDataBinder(target, "");
    ((ServletRequestDataBinder) binder).bind(request);


    assertEquals("nameValue", target.getName());
    assertEquals(25, target.getAge());
  }

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    uriTemplateVars.put("name", "nameValue");
    uriTemplateVars.put("age", "25");
    request.setAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, uriTemplateVars);


    TestBean target = new TestBean();
    WebDataBinder binder = new ExtendedServletRequestDataBinder(target, "");
    ((ServletRequestDataBinder) binder).bind(request);


    assertEquals("nameValue", target.getName());
    assertEquals(35, target.getAge());
  }

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  }


  @Test
  public void noUriTemplateVars() throws Exception {
    TestBean target = new TestBean();
    WebDataBinder binder = new ExtendedServletRequestDataBinder(target, "");
    ((ServletRequestDataBinder) binder).bind(request);


    assertEquals(null, target.getName());
    assertEquals(0, target.getAge());
  }

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  private final class ValidatingBinderFactory implements WebDataBinderFactory {
    @Override
    public WebDataBinder createBinder(NativeWebRequest webRequest, Object target, String objectName) throws Exception {
      LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
      validator.afterPropertiesSet();
      WebDataBinder dataBinder = new WebDataBinder(target, objectName);
      dataBinder.setValidator(validator);
      return dataBinder;
    }

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  private void getAttributeFromModel(String expectedAttributeName, MethodParameter param) throws Exception {
    Object target = new TestBean();
    mavContainer.addAttribute(expectedAttributeName, target);


    WebDataBinder dataBinder = new WebRequestDataBinder(target);
    WebDataBinderFactory factory = mock(WebDataBinderFactory.class);
    given(factory.createBinder(webRequest, target, expectedAttributeName)).willReturn(dataBinder);


    processor.resolveArgument(param, mavContainer, webRequest, factory);
    verify(factory).createBinder(webRequest, target, expectedAttributeName);

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