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Using these new tags, we can rewrite the register a new member page (Listing 9-5), as shown in Listing 9-19. Listing 9-19. The Register a New Member Page Using the New Spring-Provided Tags < xml version="1.0" encoding="ISO-8859-1" > <%@ taglib prefix= form uri= http://www.springframework.org/tags/form %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib prefix= form uri= http://www.springframework.org/tags/form %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Register a New Member</title> </head> <body> <h1>Register a New Member</h1> <form:form commandName= member > <table> <tbody> <tr> <td>Sex:</td> <td> <form:select path= sex > <form:option value= FEMALE /> <form:option value= MALE /> </form:select> </td> </tr>
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CHAPTER 9 VIEW TECHNOLOGIES
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<tr> <td>First Name:</td> <td> <form:input path name.first /> </td> </tr> <tr> <td>Last Name:</td> <td> <form:input path= name.last /> </td> </tr> <tr> <td>Age:</td> <td> <form:input path= age /> </td> </tr> <tr> <td>Line 1:</td> <td> <form:input path= address.line1 /> </td> </tr> <tr> <td>Line 2:</td> <td> <form:input path= address.line2 /> </td> </tr> <tr> <td>City:</td> <td> <form:input path= address.city /> </td> </tr> <tr> <td>State:</td> <td> <form:input path= address.state /> </td> </tr> <tr> <td>Zip:</td> <td> <form:input path= address.zip /> </td> </tr> <tr> <td/> <td><input type="submit" value="Register" /></td> </tr> </tbody> </table> </form> </body> </html>
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As you can see in Listing 9-19, using these new Spring-provided form tags greatly reduces the length of your forms. More important, your forms are easier to read and maintain. Also note that the <form:select> tag will determine the currently selected value when reshowing the form in case of validation errors. Another advantage of using Spring form tags is that they provide you with a convenient mechanism to display validation errors. You can use the <form:errors> tag to display validation errors in your page. Listing 9-20 shows validation error messages for the firstName field of a member. Listing 9-20. Sample Use of the errors Tag <tr> <td>First Name:</td> <td> <form:input path="name.first"/> <form:errors path= name.first /> </td> </tr> The path you specify for the <form:errors> tag defines which errors are displayed for your form field. Besides showing field-specific errors by specifying their complete name, you can also use wildcards to show any arbitrary number of errors. For instance, you could display all errors by specifying path="*". To see all validation errors for the name.first and name.last properties, use path="name.*". Another useful feature is that you can specify several attributes on the form tags, including cssClass and cssStyle, to customize the appearance. In relation to the previously mentioned errors tag, you can specify an attribute on most form tags by the name of cssErrorClass, which indicates the CSS class to set on the generated widget in case there are validation errors for the specific field. Spring will handle this transparently for you.
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This chapter introduced Spring s support for different view technologies and provided you with some guidelines for choosing the right technology to fit your needs. You may start using any one of these technologies for your web applications, or even better, combine them to provide your users with the most sophisticated views on the data within your web application. The, next and final, chapter discusses the importance of testing, explaining the difference between unit and integration testing. We will show you how to verify that the applications you create actually work as intended. Testing is a major aspect of modern-day software development; therefore, the next chapter is definitely a must-read.
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Testing
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uring the course of this book, you have seen how Spring helps you build robust Java applications. This chapter covers testing your applications. We start by discussing two important testing concepts, unit testing and integration testing (also called functional testing), explaining the difference between them. We also talk about test-driven development as a way to develop your software. Then we introduce JUnit and EasyMock, two frameworks that are the de facto standard when it comes to testing Java applications. We will show you how to use the power of both frameworks to extensively test your application. Of course, this chapter would not fit in this book if it did not expand on some of the testing features provided by Spring. You will learn how to test your Spring configuration files and the configuration of the objects created by the Spring container. Using the information in this chapter, you will be able to test the configuration of your web applications.
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