本教程次要具体解说Guice的一些AOP形式,通过该简略教程让咱们能够疾速应用Guice进行AOP开发,后续咱们会更深刻解说更多Guice中的AOP.
根底环境
| 技术 | 版本 |
|---|---|
| Java | 1.8+ |
| Guice | 4.2.3 |
初始化我的项目
- 初始化我的项目
mvn archetype:generate -DgroupId=io.edurt.lc.guice -DartifactId=guice-aop-senior -DarchetypeArtifactId=maven-archetype-quickstart -Dversion=1.0.0 -DinteractiveMode=false- 批改pom.xml减少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-senior</artifactId> <name>Learning Center for Guice AOP(Senior)</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
首先咱们定义服务Service，这个服务有一个简略的办法println.
- 在
src/main/java目录下新建io.edurt.lc.guice.GuiceAopSeniorService类文件,在文件输出以下内容
package io.edurt.lc.guice;import com.google.inject.ImplementedBy;import org.aopalliance.intercept.MethodInvocation;@ImplementedBy(value = GuiceAopSeniorServiceImpl.class)public interface GuiceAopSeniorService{ void before(MethodInvocation invocation);}- 在
src/main/java目录下新建io.edurt.lc.guice.GuiceAopSeniorServiceImpl类文件,在文件输出以下内容
package io.edurt.lc.guice;import org.aopalliance.intercept.MethodInvocation;public class GuiceAopSeniorServiceImpl implements GuiceAopSeniorService{ @Override public void before(MethodInvocation invocation) { System.out.println(String.format("Before method [%s]", invocation.getMethod().getName())); }}AOP注入依赖
Guice容许在关联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.GuiceAopInjectionMethodInterceptor类文件,在文件输出以下内容
package io.edurt.lc.guice;import com.google.inject.Inject;import org.aopalliance.intercept.MethodInterceptor;import org.aopalliance.intercept.MethodInvocation;public class GuiceAopInjectionMethodInterceptor implements MethodInterceptor{ @Inject private GuiceAopSeniorService service; @Override public Object invoke(MethodInvocation invocation) throws Throwable { service.before(invocation); Object response; try { response = invocation.proceed(); } finally { System.out.println(String.format("After [%s]", invocation.getMethod().getName())); } return response; }}- 在
src/main/java目录下新建io.edurt.lc.guice.PrintlnService类文件,在文件输出以下内容
package io.edurt.lc.guice;import com.google.inject.ImplementedBy;@ImplementedBy(value = PrintlnServiceImpl.class)public interface PrintlnService{ void println(String input);}- 在
src/main/java目录下新建io.edurt.lc.guice.PrintlnServiceImpl类文件,在文件输出以下内容
package io.edurt.lc.guice;import com.google.inject.name.Named;public class PrintlnServiceImpl implements PrintlnService{ @Override @Named(value = "println") public void println(String input) { System.out.println(input); }}PrintlnService和PrintlnServiceImpl用于测试新的服务产出.
- 接下来在
src/test/java目录创立io.edurt.lc.guice.TestGuiceAopSenior类文件进行定义的服务进行测试,增加以下代码
package io.edurt.lc.guice;import com.google.inject.Guice;import com.google.inject.Inject;import com.google.inject.Injector;import com.google.inject.matcher.Matchers;import com.google.inject.name.Names;import org.junit.Test;public class TestGuiceAopSenior{ @Inject private PrintlnService printlnService; @Test public void test() { Injector injector = Guice.createInjector(binder -> { GuiceAopInjectionMethodInterceptor injectionMethodInterceptor = new GuiceAopInjectionMethodInterceptor(); binder.requestInjection(injectionMethodInterceptor); binder.bindInterceptor(Matchers.any(), Matchers.annotatedWith(Names.named("println")), injectionMethodInterceptor); }); TestGuiceAopSenior application = injector.getInstance(TestGuiceAopSenior.class); application.printlnService.println("Hello Guice AOP"); }}咱们运行程序输入
Before method [println]Hello Guice AOPAfter [println]须要留神的是:binder.requestInjection(injectionMethodInterceptor);该段代码用于注入自定义的AOP服务binder.bindInterceptor(Matchers.any(), Matchers.annotatedWith(Names.named("println")), injectionMethodInterceptor);这里的第二个参数不能应用Matchers.any()否则会呈现死循环,因为容器会一直的进行aop操作
源码地址
GitHub