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c# create barcode free Setter Injection in Font
Setter Injection Create Quick Response Code In None Using Barcode encoder for Font Control to generate, create QR-Code image in Font applications. www.OnBarcode.comPrint QR Code ISO/IEC18004 In None Using Barcode maker for Font Control to generate, create QR Code image in Font applications. www.OnBarcode.comThe <property> elements in Listing 2-5 specify the setter injections on bean properties. These properties are defined in the JavaBean specifications and are typically used to read and assign class member variables. The method names and types in the getter and setter methods must match. The property names in the XML file refer to this name, although the first letter of the property name must be lowercase. For example, the setFullName() method becomes fullName, the setRanking() method becomes ranking, and so on. To set a property with the Spring container, you need at least a setter method, as shown in Listing 2-6. Listing 2-6. Write-Only JavaBean Properties Have Only Setter Methods package com.apress.springbook.chapter02; public class Player { private String fullName; private int ranking; public void setFullName(String fullName) { this.fullName = fullName; } public void setRanking(int ranking) { this.ranking = ranking; } } You can optionally add a getter method to make the property readable, as shown in Listing 2-7, but this is not required by the container. Listing 2-7. Adding a Getter Method to Make the JavaBean Property Readable package com.apress.springbook.chapter02; public class Player { private String fullName; private int ranking; public void setFullName(String fullName) { this.fullName = fullName; } Printing Code 128 Code Set C In None Using Barcode creation for Font Control to generate, create Code 128 image in Font applications. www.OnBarcode.comEAN / UCC - 13 Printer In None Using Barcode drawer for Font Control to generate, create EAN / UCC - 13 image in Font applications. www.OnBarcode.comCHAPTER 2 THE CORE CONTAINER
Encoding GS1 - 12 In None Using Barcode drawer for Font Control to generate, create UPC A image in Font applications. www.OnBarcode.comPDF 417 Creation In None Using Barcode maker for Font Control to generate, create PDF417 image in Font applications. www.OnBarcode.compublic void setRanking(int ranking) { this.ranking = ranking; } public String getFullName() { return this.fullName; } public int getRanking() { return this.ranking; } } Setter injection can inject values and other beans, as shown in Listing 2-8. Listing 2-8. Injecting Values and Other Beans via Setter Methods < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="Kim" class="com.apress.springbook.chapter02.Player"> <property name="fullName" value="Kim Clijsters"/> <property name="ranking" value="1"/> </bean> <bean id="Justine" class="com.apress.springbook.chapter02.Player"> <property name="fullName" ref="Henin-Hardenne"/> <property name="ranking" value="5"/> </bean> <bean id="Henin-Hardenne" class="java.lang.String"> <constructor-arg value="Justine Henin-Hardenne"/> </bean> </beans> The value attribute injects a literal value from the XML file, and the ref attribute injects another bean. This example creates a java.lang.String bean, indicating that the container can instantiate any class. Barcode Creation In None Using Barcode drawer for Font Control to generate, create Barcode image in Font applications. www.OnBarcode.comPainting USD-3 In None Using Barcode creation for Font Control to generate, create Code 93 Full ASCII image in Font applications. www.OnBarcode.comConstructor Injection
QR Code ISO/IEC18004 Generator In None Using Barcode maker for Font Control to generate, create QR Code 2d barcode image in Font applications. www.OnBarcode.comQR Encoder In None Using Barcode printer for Software Control to generate, create QR Code image in Software applications. www.OnBarcode.comWe ll rewrite the Player class to use constructor injection, as shown in Listing 2-9. Listing 2-9. The Player Class, Which Takes Its Internal State via the Constructor package com.apress.springbook.chapter02; public class Player { private String fullName; private int ranking; public Player(String fullName, int ranking) { if (fullName == null || fullName.length() == 0) { throw new IllegalArgumentException("Full name is required!"); } this.fullName = fullName; Painting PDF-417 2d Barcode In Java Using Barcode generation for Eclipse BIRT Control to generate, create PDF417 image in BIRT reports applications. www.OnBarcode.comEncode DataMatrix In None Using Barcode generator for Microsoft Word Control to generate, create ECC200 image in Microsoft Word applications. www.OnBarcode.comCHAPTER 2 THE CORE CONTAINER
Encode Linear In .NET Framework Using Barcode generation for ASP.NET Control to generate, create Linear Barcode image in ASP.NET applications. www.OnBarcode.comCode 39 Extended Decoder In Visual Basic .NET Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications. www.OnBarcode.comthis.ranking = ranking; } public String getFullName() { return this.fullName; } public int getRanking() { return this.ranking; } } By refactoring the Player class, we ve introduced one significant change by making the full name required. Checking the state of the object is the most important reason that developers create constructors in their classes. Listing 2-10 shows how the container is instructed to call the constructor. Listing 2-10. Instructing the Container to Call the Player Constructor < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="Kim" class="com.apress.springbook.chapter02.Player"> <constructor-arg value="Kim Clijsters"/> <constructor-arg value="1"/> </bean> <bean id="Justine" class="com.apress.springbook.chapter02.Player"> <constructor-arg ref="Henin-Hardenne"/> <constructor-arg value="5"/> </bean> <bean id="Henin-Hardenne" class="java.lang.String"> <constructor-arg value="Justine Henin-Hardenne"/> </bean> </beans> The container must choose which constructor it will invoke based on the information in the bean definition. For the configuration in Listing 2-10, the behavior is predictable since the Player class defines only one constructor. Listing 2-11 shows an example that includes two constructors. Data Matrix ECC200 Scanner In Java Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comReading EAN-13 In Java Using Barcode reader for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.com Note
ANSI/AIM Code 39 Scanner In Java Using Barcode reader for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comPDF-417 2d Barcode Scanner In Java Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comIn Java, the names of constructor arguments cannot be retrieved from compiled classes by the Reflection API. Other tools, like the open source ASM framework, can retrieve constructor argument names by looking at debug information in the compiled bytecode. However, at the time of this writing, the container does not take the name of arguments into account when invoking constructors. Code39 Generation In Java Using Barcode drawer for Java Control to generate, create Code 39 Extended image in Java applications. www.OnBarcode.comPaint Barcode In None Using Barcode creator for Online Control to generate, create Barcode image in Online applications. www.OnBarcode.comListing 2-11. The ConstructorTestBean Class, Which Has Two Constructors package com.apress.springbook.chapter02; public class ConstructorTestBean { private boolean constructor1Used = false; private boolean constructor2Used = false;
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