В этой главе мы напишем реальные приложения AOP, используя Spring AOP Framework. Прежде чем приступить к написанию своего первого примера с использованием среды Spring-WS, необходимо убедиться, что вы правильно настроили среду Spring AOP, как описано в главе « Веб-службы Spring — Настройка среды» .
Теперь перейдем к написанию простого консольного приложения Spring AOP, которое продемонстрирует концепции AOP.
Создать проект
Шаг 1 — Откройте консоль команд, перейдите в каталог C: \ MVN и выполните следующую команду mvn .
C:\MVN>mvn archetype:generate -DgroupId = com.tutorialspoint -DartifactId = Student -DarchetypeArtifactId = maven-archetype-quickstart -DinteractiveMode = false
Maven начнет обработку и создаст полную структуру проекта приложения Java.
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.4:generate (default-cli) > generate-sources @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.4:generate (default-cli) < generate-sources @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.4:generate (default-cli) @ standalone-pom -- - [INFO] Generating project in Batch mode Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/archetypes/ma ven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/archetypes/mav en-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar (5 KB at 1.1 KB/s ec) Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/archetypes/ma ven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.pom Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/archetypes/mav en-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.pom (703 B at 1.2 KB/ sec) [INFO] ------------------------------------------------------------------------- --- [INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-quickstart:1.0 [INFO] ------------------------------------------------------------------------- --- [INFO] Parameter: groupId, Value: com.tutorialspoint [INFO] Parameter: packageName, Value: com.tutorialspoint [INFO] Parameter: package, Value: com.tutorialspoint [INFO] Parameter: artifactId, Value: Student [INFO] Parameter: basedir, Value: C:\MVN [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] project created from Old (1.x) Archetype in dir: C:\MVN\Student [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 01:17 min [INFO] Finished at: 2017-02-19T21:11:14+05:30 [INFO] Final Memory: 15M/114M [INFO] ------------------------------------------------------------------------
Шаг 2 — Перейдите в каталог C: / MVN. Вы увидите созданный проект приложения Java с именем student (как указано в artifactId). Обновите файл POM.xml, включив в него зависимости Spring-AOP. Добавьте файлы MainApp.java, Student.java и Logging.java.
pom.xml
<project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.tutorialspoint</groupId> <artifactId>Student</artifactId> <packaging>jar</packaging> <version>1.0-SNAPSHOT</version> <name>Student</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.1.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.4.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.6.8</version> </dependency> </dependencies> </project> package com.tutorialspoint; public class Logging { /** * This is the method which I would like to execute * before a selected method execution. */ public void beforeAdvice() { System.out.println("Going to setup student profile."); } /** * This is the method which I would like to execute * after a selected method execution. */ public void afterAdvice() { System.out.println("Student profile has been setup."); } /** * This is the method which I would like to execute * when any method returns. */ public void afterReturningAdvice(Object retVal){ System.out.println("Returning:" + retVal.toString() ); } /** * This is the method which I would like to execute * if there is an exception raised. */ public void AfterThrowingAdvice(IllegalArgumentException ex) { System.out.println("There has been an exception: " + ex.toString()); } }
Ниже приводится содержание файла Student.java .
package com.tutorialspoint;
public class Student {
private Integer age;
private String name;
public void setAge(Integer age) {
this.age = age;
}
public Integer getAge() {
System.out.println("Age : " + age );
return age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
System.out.println("Name : " + name );
return name;
}
public void printThrowException(){
System.out.println("Exception raised");
throw new IllegalArgumentException();
}
}
Ниже приводится содержание файла MainApp.java .
package com.tutorialspoint;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
ApplicationContext context =
new ClassPathXmlApplicationContext("Beans.xml");
Student student = (Student) context.getBean("student");
student.getName();
student.getAge();
student.printThrowException();
}
}
Шаг 3 — Добавьте файл конфигурации Beans.xml в папку src> main> resources .
<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop = "http://www.springframework.org/schema/aop"
xsi:schemaLocation = "http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd ">
<aop:config>
<aop:aspect id = "log" ref = "logging">
<aop:PointCut id = "selectAll"
expression = "execution(* com.tutorialspoint.*.*(..))"/>
<aop:before PointCut-ref = "selectAll" method = "beforeAdvice"/>
<aop:after PointCut-ref = "selectAll" method = "afterAdvice"/>
<aop:after-returning PointCut-ref = "selectAll"
returning = "retVal"
method = "afterReturningAdvice"/>
<aop:after-throwing PointCut-ref = "selectAll"
throwing = "ex"
method = "AfterThrowingAdvice"/>
</aop:aspect>
</aop:config>
<!-- Definition for student bean -->
<bean id = "student" class = "com.tutorialspoint.Student">
<property name = "name" value = "Zara" />
<property name = "age" value = "11"/>
</bean>
<!-- Definition for logging aspect -->
<bean id = "logging" class = "com.tutorialspoint.Logging"/>
</beans>
Шаг 4 — Откройте командную консоль, перейдите в каталог C: \ MVN и выполните следующую команду mvn .
C:\MVN>Student> mvn package
Maven начнет обработку и загрузку необходимых библиотек.
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Student 1.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven -jar-plugin/2.4/maven-jar-plugin-2.4.pom Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven- jar-plugin/2.4/maven-jar-plugin-2.4.pom (6 KB at 2.2 KB/sec) Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven -jar-plugin/2.4/maven-jar-plugin-2.4.jar Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven- jar-plugin/2.4/maven-jar-plugin-2.4.jar (34 KB at 31.6 KB/sec) Downloading: https://repo.maven.apache.org/maven2/org/springframework/spring-aop /4.1.0.RELEASE/spring-aop-4.1.0.RELEASE.pom Downloaded: https://repo.maven.apache.org/maven2/org/springframework/spring-aop/ 4.1.0.RELEASE/spring-aop-4.1.0.RELEASE.pom (3 KB at 3.7 KB/sec) Downloading: https://repo.maven.apache.org/maven2/org/springframework/spring-bea ns/4.1.0.RELEASE/spring-beans-4.1.0.RELEASE.pom Downloaded: https://repo.maven.apache.org/maven2/org/springframework/spring-bean s/4.1.0.RELEASE/spring-beans-4.1.0.RELEASE.pom (3 KB at 4.1 KB/sec) Downloading: https://repo.maven.apache.org/maven2/org/springframework/spring-cor e/4.1.0.RELEASE/spring-core-4.1.0.RELEASE.pom Downloaded: https://repo.maven.apache.org/maven2/org/springframework/spring-core /4.1.0.RELEASE/spring-core-4.1.0.RELEASE.pom (3 KB at 4.0 KB/sec) Downloading: https://repo.maven.apache.org/maven2/org/springframework/spring-aop /4.1.0.RELEASE/spring-aop-4.1.0.RELEASE.jar Downloading: https://repo.maven.apache.org/maven2/org/springframework/spring-cor e/4.1.0.RELEASE/spring-core-4.1.0.RELEASE.jar Downloading: https://repo.maven.apache.org/maven2/org/springframework/spring-bea ns/4.1.0.RELEASE/spring-beans-4.1.0.RELEASE.jar Downloaded: https://repo.maven.apache.org/maven2/org/springframework/spring-aop/ 4.1.0.RELEASE/spring-aop-4.1.0.RELEASE.jar (351 KB at 43.9 KB/sec) Downloaded: https://repo.maven.apache.org/maven2/org/springframework/spring-bean s/4.1.0.RELEASE/spring-beans-4.1.0.RELEASE.jar (685 KB at 37.5 KB/sec) Downloaded: https://repo.maven.apache.org/maven2/org/springframework/spring-core /4.1.0.RELEASE/spring-core-4.1.0.RELEASE.jar (982 KB at 47.1 KB/sec) [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Student -- - [WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory C:\MVN\Student\src\main\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Student --- [INFO] Changes detected - recompiling the module! [WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. b uild is platform dependent! [INFO] Compiling 1 source file to C:\MVN\Student\target\classes [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ St udent --- [WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory C:\MVN\Student\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ Student --- [INFO] Changes detected - recompiling the module! [WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. b uild is platform dependent! [INFO] Compiling 1 source file to C:\MVN\Student\target\test-classes [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ Student --- [INFO] Surefire report directory: C:\MVN\Student\target\surefire-reports Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/sure fire-junit3/2.12.4/surefire-junit3-2.12.4.pom Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/suref ire-junit3/2.12.4/surefire-junit3-2.12.4.pom (2 KB at 1.3 KB/sec) Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/sure fire-junit3/2.12.4/surefire-junit3-2.12.4.jar Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/suref ire-junit3/2.12.4/surefire-junit3-2.12.4.jar (26 KB at 27.7 KB/sec) ------------------------------------------------------- T E S T S ------------------------------------------------------- Running com.tutorialspoint.AppTest Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.002 sec Results : Tests run: 1, Failures: 0, Errors: 0, Skipped: 0 [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ Student --- Downloading: https://repo.maven.apache.org/maven2/classworlds/classworlds/1.1-al pha-2/classworlds-1.1-alpha-2.jar Downloaded: https://repo.maven.apache.org/maven2/classworlds/classworlds/1.1-alp ha-2/classworlds-1.1-alpha-2.jar (37 KB at 35.8 KB/sec) [INFO] Building jar: C:\MVN\Student\target\Student-1.0-SNAPSHOT.jar [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 38.441 s [INFO] Finished at: 2017-02-19T21:18:59+05:30 [INFO] Final Memory: 18M/109M [INFO] ------------------------------------------------------------------------
Импортировать проект в Eclipse
Шаг 1 — Откройте Eclipse.
Шаг 2 — Выберите Файл → Импорт → опция.
Шаг 3 — Выберите опцию Maven Projects. Нажмите кнопку «Далее».
Шаг 4 — Выберите местоположение проекта, где проект Student был создан с использованием Maven.
Шаг 5 — Нажмите кнопку Готово.
Запустить проект
Как только вы закончите создание исходного файла и файлов конфигурации, запустите ваше приложение. Щелкните правой кнопкой мыши файл MainApp.java в своем приложении и используйте команду запуска от имени приложения Java . Если с вашим приложением все в порядке, оно напечатает следующее сообщение.