e387. logging a method call.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 40 行

The logger provides convenience methods Logger.entering() and Logger.exiting() for logging method calls. This example implements a method that logs the parameters upon entry and the result when returning. 
See also e388 Logging an Exception. 

    package com.mycompany;
    class MyClass {
        public boolean myMethod(int p1, Object p2) {
            // Log entry
            Logger logger = Logger.getLogger("com.mycompany.MyClass");
            if (logger.isLoggable(Level.FINER)) {
                logger.entering(this.getClass().getName(), "myMethod",
                                new Object[]{new Integer(p1), p2});
            }
    
            // Method body
    
            // Log exit
            boolean result = true;
            if (logger.isLoggable(Level.FINER)) {
                logger.exiting(this.getClass().getName(), "myMethod", new Boolean(result));
    
                // Use the following if the method does not return a value
                logger.exiting(this.getClass().getName(), "myMethod");
            }
            return result;
         }
    }

Here is a sample of the output using a simple formatter and the following call: 
    new com.mycompany.MyClass().myMethod(123, "hello");
    
    Jan 10, 2002 7:59:48 PM com.mycompany.MyClass myMethod
    FINER: ENTRY 123 hello
    Jan 10, 2002 7:59:49 PM com.mycompany.MyClass myMethod
    FINER: RETURN true
    Jan 10, 2002 7:59:49 PM com.mycompany.MyClass myMethod
    FINER: RETURN

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