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Listing 6-28. TwoDatesCommand Class public class TwoDatesCommand { private Date firstDate; private Date secondDate; public Date getFirstDate() { return firstDate; } public void setFirstDate(Date firstDate) { this.firstDate = firstDate; } public Date getSecondDate() { return secondDate; } public void setSecondDate(Date secondDate) { this.secondDate = secondDate; } } Listing 6-29 simply shows the XHTML form for both dates. Listing 6-29. TwoDates HTML Form <form> <p> First Date: <input type="text" name="firstDate" /> (YYYY-MM-DD) </p> <p> Second Date: <input type="text" name="secondDate" /> (DD-MM-YYYY) </p> <p><input type="submit" /></p> </form> Listing 6-30. TwoDatesCommand Unit Test protected void setUp() throws Exception { bean = new TwoDatesCommand(); request = new MockHttpServletRequest(); binder = new ServletRequestDataBinder(bean, "bean"); } public void testBind() throws Exception { SimpleDateFormat firstDateFormat = new SimpleDateFormat("yyyy-MM-dd"); Date firstExpected = firstDateFormat.parse("2001-01-01"); SimpleDateFormat secondDateFormat = new SimpleDateFormat("dd-MM-yyyy"); Date secondExpected = secondDateFormat.parse("01-01-2001");
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CustomDateEditor firstDateEditor = new CustomDateEditor(firstDateFormat, true); CustomDateEditor secondDateEditor = new CustomDateEditor(secondDateFormat, true); binder.registerCustomEditor(Date.class, "firstDate", firstDateEditor); binder.registerCustomEditor(Date.class, "secondDate", secondDateEditor); request.addParameter("firstDate", "2001-01-01"); request.addParameter("secondDate", "01-01-2001"); binder.bind(request); assertEquals(firstExpected, bean.getFirstDate()); // true! assertEquals(secondExpected, bean.getSecondDate()); // true! } As you can see in Listing 6-30, when we register the PropertyEditor to the DataBinder, we can also specify which property, or field, the PropertyEditor should apply to. This overrides any PropertyEditor already bound to a class.
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Custom PropertyEditors
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Although Spring provides many useful PropertyEditors, often times you will wish to convert some String value to a specific domain class from your object model. Creating and registering your own PropertyEditors is as simple as registering any PropertyEditor to the DataBinder. For example, consider a typical PhoneNumber class. This class might encapsulate a typical phone number, consisting of an area code and the number. The HTML form might allow a phone number to be entered with a single text input field, as long as it conforms to the standard (xxx) xxx-xxxx format. To begin, let us define a simple PhoneNumber class in Listing 6-31. Listing 6-31. PhoneNumber Class public class PhoneNumber { private String areaCode; private String prefix; private String suffix; public String getAreaCode() { return areaCode; } public void setAreaCode(String areaCode) { this.areaCode = areaCode; } public String getPrefix() { return prefix; } public void setPrefix(String prefix) {
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this.prefix = prefix; } public String getSuffix() { return suffix; } public void setSuffix(String suffix) { this.suffix = suffix; } public String toString() { return "(" + areaCode + ") " + prefix + "-" + suffix; } } We will need a command class to contain a PhoneNumber property so that it may be set by the DataBinder. Of course, Spring MVC doesn t require nesting your domain class inside some command bean. If you wish to create a form with input fields directly mapping to properties of the PhoneNumber, then there is no need for a custom PropertyEditor (because all properties of a PhoneNumber are String in this case). Listing 6-32 illustrates how to convert a single text field into a (relatively) complex domain object, so we will treat the PhoneNumber as a property itself. Listing 6-32. PhoneNumberCommand Bean public class PhoneNumberCommand { private PhoneNumber phoneNumber; public PhoneNumber getPhoneNumber() { return phoneNumber; } public void setPhoneNumber(PhoneNumber phoneNumber) { this.phoneNumber = phoneNumber; }
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} For the real fun of this example, we now create the PhoneNumberPropertyEditor (shown in Listing 6-33) that knows how to convert a string with the format ^(\d{3}) \d{3}-\d{4}$ (as a regular expression) into a PhoneNumber instance. Listing 6-33. PhoneNumberEditor Class public class PhoneNumberEditor extends PropertyEditorSupport { private Pattern pattern = Pattern.compile("^\\((\\d{3})\\) (\\d{3})-(\\d{4})$"); @Override
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public void setAsText(String text) throws IllegalArgumentException { if (! StringUtils.hasText(text)) { throw new IllegalArgumentException("text must not be empty or null"); } Matcher matcher = pattern.matcher(text); if (matcher.matches()) { PhoneNumber phoneNumber = new PhoneNumber(); phoneNumber.setAreaCode(matcher.group(1)); phoneNumber.setPrefix(matcher.group(2)); phoneNumber.setSuffix(matcher.group(3)); setValue(phoneNumber); } else { throw new IllegalArgumentException(text + " does not match pattern " + pattern); } } @Override public String getAsText() { return getValue().toString(); } } The HTML form with a phone number input field would look something like that in Listing 6-34. Listing 6-34. PhoneNumber HTML Form <form> <p> Phone Number: <input type="text" name="phoneNumber" /> (XXX) XXX-XXXX </p> <p><input type="submit" /></p> </form> The following unit test, Listing 6-35, simulates the HTTP request with a value of (222) 333-4444 as the user s phone number. Listing 6-35. PhoneNumberEditor Binding Unit Test protected void setUp() throws Exception { bean = new PhoneNumberCommand(); request = new MockHttpServletRequest(); binder = new ServletRequestDataBinder(bean, "bean");
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