本教程主要详细讲解Guice的一些AOP方式,通过该简单教程让我们可以快速使用Guice进行AOP开发,后续我们会更深入讲解更多Guice中的AOP.
基础环境
技术 | 版本 |
---|---|
Java | 1.8+ |
Guice | 4.2.3 |
初始化项目
- 初始化项目
mvn archetype:generate -DgroupId=io.edurt.lc.guice -DartifactId=guice-aop-matcher -DarchetypeArtifactId=maven-archetype-quickstart -Dversion=1.0.0 -DinteractiveMode=false
- 修改pom.xml增加Guice依赖
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>lc-guice</artifactId>
<groupId>io.edurt.lc.guice</groupId>
<version>1.0.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>guice-aop-matcher</artifactId>
<name>Learning Center for Guice AOP(Matcher)</name>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.google.inject</groupId>
<artifactId>guice</artifactId>
<version>4.2.3</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
初始化Service
首先我们定义服务Service,这个服务有一个简单的方法println
.
- 在
src/main/java
目录下新建io.edurt.lc.guice.GuiceAopMatcherService类文件,在文件输入以下内容
package io.edurt.lc.guice;
import com.google.inject.ImplementedBy;
@ImplementedBy(value = GuiceAopMatcherServiceImpl.class)
public interface GuiceAopMatcherService
{
void println(String input);
}
- 在
src/main/java
目录下新建io.edurt.lc.guice.GuiceAopMatcherServiceImpl类文件,在文件输入以下内容
package io.edurt.lc.guice;
public class GuiceAopMatcherServiceImpl
implements GuiceAopMatcherService
{
@Override
public void println(String input)
{
System.out.println("Matcher input : " + input);
}
}
AOP注入依赖
Guice允许在关联AOP之前将AOP的依赖都注入到容器中!
- 在
src/main/java
目录下新建io.edurt.lc.guice.GuiceAopMatcherMethodInterceptor类文件,在文件输入以下内容
package io.edurt.lc.guice;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class GuiceAopMatcherMethodInterceptor
implements MethodInterceptor
{
@Override
public Object invoke(MethodInvocation methodInvocation)
throws Throwable
{
String methodName = methodInvocation.getMethod().getName();
long startTime = System.nanoTime();
System.out.println(String.format("Before Method[%s] start in %s", methodName, startTime));
Object response;
try {
response = methodInvocation.proceed();
}
finally {
long endTime = System.nanoTime();
System.out.println(String.format("After Method[%s] stop %s, Elapsed(nanosecond): %d", methodName, endTime, (endTime - startTime)));
}
return response;
}
}
- 在
src/test/java
目录创建io.edurt.lc.guice.GuiceAopJavaServiceMatcher
类文件进行定义的服务进行测试,添加以下代码
package io.edurt.lc.guice;
import com.google.inject.matcher.Matcher;
public class GuiceAopJavaServiceMatcher
implements Matcher<Class<?>>
{
@Override
public boolean matches(Class<?> aClass)
{
// return aClass == GuiceAopMatcherService.class;
return aClass == GuiceAopMatcherServiceImpl.class;
}
@Override
public Matcher<Class<?>> and(Matcher<? super Class<?>> matcher)
{
return null;
}
@Override
public Matcher<Class<?>> or(Matcher<? super Class<?>> matcher)
{
return null;
}
}
- 接下来在
src/test/java
目录创建io.edurt.lc.guice.TestGuiceAopJavaServiceMatcher
类文件进行定义的服务进行测试,添加以下代码
package io.edurt.lc.guice;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.matcher.Matchers;
import org.junit.Test;
public class TestGuiceAopJavaServiceMatcher
{
@Test
public void test()
{
Injector injector = Guice.createInjector(binder -> binder.bindInterceptor(new GuiceAopJavaServiceMatcher(),
Matchers.any(),
new GuiceAopMatcherMethodInterceptor()));
GuiceAopMatcherService javaServiceMatcher = injector.getInstance(GuiceAopMatcherServiceImpl.class);
javaServiceMatcher.println("Hello Guice!!!");
}
}
我们运行程序输出
Before Method[println] start in 174453945750833
Matcher input : Hello Guice!!!
After Method[println] stop 174453952765375, Elapsed(nanosecond): 7014542
需要注意的是:
return aClass == GuiceAopMatcherService.class;
这里判定的是相对的类,在我们的示例中是return aClass == GuiceAopMatcherServiceImpl.class;
如果要使用父类自动转换的话需要自己解析类的实现即可
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