Java内容重新整理删除过期的东西

2026-02-06 03:54:22 +08:00 · 2025-09-14 03:49:42 -04:00
parent 9b8524ff80
commit 885b795e45
413 changed files with 643 additions and 1340 deletions
--- a/Java/JavaDemo/codedemo/aspectj/BusinessServiceInterceptor.java
+++ b/Java/JavaDemo/codedemo/aspectj/BusinessServiceInterceptor.java
@@ -0,0 +1,122 @@
+package cn.aofeng.demo.aspectj;
+
+import org.apache.commons.lang.ArrayUtils;
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.After;
+import org.aspectj.lang.annotation.AfterReturning;
+import org.aspectj.lang.annotation.AfterThrowing;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 拦截器。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+@Aspect
+public class BusinessServiceInterceptor {
+
+    private static Logger _logger = LoggerFactory.getLogger(BusinessServiceInterceptor.class);
+    
+    private char _style = '-';
+    
+    /**
+     * <pre>
+     * Before通知不能修改方法传入的参数。
+     * </pre>
+     */
+    @Before("execution(public * cn.aofeng.demo.aspectj.BusinessService.add(..))")
+    public void beforeAdd(JoinPoint joinPoint) {
+        _logger.info( String.format("拦截到方法：%s, 传入参数：%s", 
+                joinPoint.getSignature().getName(), 
+                ArrayUtils.toString(joinPoint.getArgs()) ) );
+        BusinessService.printLine(_style);
+    }
+
+    /**
+     * <pre>
+     * After通知不能修改方法的返回值。
+     * 如果被拦截的方法抛出异常，拦截代码仍然正常执行。
+     * </pre>
+     */
+    @After("execution(public * cn.aofeng.demo.aspectj.BusinessService.join(..))")
+    public void beforeAddSupportMultiArgs(JoinPoint joinPoint) {
+        _logger.info("Signature.name："+joinPoint.getSignature().getName());
+        _logger.info("Args：" + ArrayUtils.toString(joinPoint.getArgs()));
+        _logger.info("Target：" + ArrayUtils.toString(joinPoint.getTarget()));
+        _logger.info("This：" + ArrayUtils.toString(joinPoint.getThis()));
+        _logger.info("Kind：" + ArrayUtils.toString(joinPoint.getKind()));
+        _logger.info("SourceLocation：" + ArrayUtils.toString(joinPoint.getSourceLocation()));
+        
+        // 试图修改传入的参数
+        joinPoint.getArgs()[0] = "100";
+        
+        BusinessService.printLine(_style);
+    }
+    
+    /**
+     * <pre>
+     * AfterReturning通知不能修改方法的返回值。
+     * 如果被拦截的方法抛出异常，拦截代码不再执行。
+     * </pre>
+     */
+    @AfterReturning(pointcut="execution(public * cn.aofeng.demo.aspectj.BusinessService.join(..))", returning="result")
+    public void afterReturnAdd(JoinPoint joinPoint, Object result) {
+        _logger.info( String.format("拦截到方法：%s, 传入参数：%s, 执行结果：%s", 
+                joinPoint.getSignature().getName(), 
+                ArrayUtils.toString(joinPoint.getArgs()), 
+                result) );
+        
+        // 试图修改返回值
+        result = "hello, changed";
+        
+        BusinessService.printLine(_style);
+    }
+    
+    /**
+     * <pre>
+     * 只在被拦截的方法抛出异常时才执行。
+     * </pre>
+     */
+    @AfterThrowing(pointcut="execution(public * cn.aofeng.demo.aspectj.BusinessService.join(..))", throwing="ex")
+    public void afterThrowingAdd(JoinPoint joinPoint, Exception ex) {
+        _logger.info( String.format("拦截到方法：%s, 传入参数：%s", 
+                joinPoint.getSignature().getName(), 
+                ArrayUtils.toString(joinPoint.getArgs()) ) );
+        if (null != ex) {
+            _logger.info("拦截到异常：", ex);
+        }
+        
+        BusinessService.printLine(_style);
+    }
+
+    /**
+     * <pre>
+     * {@link ProceedingJoinPoint}只能在Around通知中使用。
+     * Around通知可以修改被拦截方法的传入参数和返回值。
+     * </pre>
+     */
+    @Around("execution(public * cn.aofeng.demo.aspectj.BusinessService.addPrefix(..))")
+    public Object afterAround(ProceedingJoinPoint joinPoint) throws Throwable {
+        _logger.info( String.format("拦截到方法：%s, 传入参数：%s", 
+                joinPoint.getSignature().getName(), 
+                ArrayUtils.toString(joinPoint.getArgs()) ) );
+        
+        Object result = null;
+        try {
+            result = joinPoint.proceed();
+            _logger.info("执行结果：" + result);
+        } catch (Throwable e) {
+            throw e;
+        } finally {
+            BusinessService.printLine(_style);
+        }
+        
+        return result;
+    }
+
+}