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Author: myhhub

src/main/java/com/mayaha/dp/cor/AbstractLogger.java

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+package com.mayaha.dp.cor;
+
+public abstract class AbstractLogger {
+    public static int INFO = 1;
+    public static int DEBUG = 2;
+    public static int ERROR = 3;
+
+    protected int level;
+
+    //责任链中的下一个元素
+    protected AbstractLogger nextLogger;
+
+    public void setNextLogger(AbstractLogger nextLogger){
+        this.nextLogger = nextLogger;
+    }
+
+    public void logMessage(int level, String message){
+        if(this.level <= level){
+            write(message);
+        }
+        if(nextLogger !=null){
+            nextLogger.logMessage(level, message);
+        }
+    }
+
+    abstract protected void write(String message);
+
+}

src/main/java/com/mayaha/dp/cor/ConsoleLogger.java

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+package com.mayaha.dp.cor;
+
+public class ConsoleLogger extends AbstractLogger {
+
+    public ConsoleLogger(int level){
+        this.level = level;
+    }
+
+    @Override
+    protected void write(String message) {
+        System.out.println("Standard Console::Logger: " + message);
+    }
+}

src/main/java/com/mayaha/dp/cor/ErrorLogger.java

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+package com.mayaha.dp.cor;
+
+public class ErrorLogger extends AbstractLogger {
+
+    public ErrorLogger(int level){
+        this.level = level;
+    }
+
+    @Override
+    protected void write(String message) {
+        System.out.println("Error Console::Logger: " + message);
+    }
+}

src/main/java/com/mayaha/dp/cor/FileLogger.java

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+package com.mayaha.dp.cor;
+
+public class FileLogger extends AbstractLogger {
+
+    public FileLogger(int level){
+        this.level = level;
+    }
+
+    @Override
+    protected void write(String message) {
+        System.out.println("File::Logger: " + message);
+    }
+}

src/main/java/com/mayaha/dp/cor/Main.java

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+package com.mayaha.dp.cor;
+
+public class Main {
+
+    private static AbstractLogger getChainOfLoggers(){
+
+        AbstractLogger errorLogger = new ErrorLogger(AbstractLogger.ERROR);
+        AbstractLogger fileLogger = new FileLogger(AbstractLogger.DEBUG);
+        AbstractLogger consoleLogger = new ConsoleLogger(AbstractLogger.INFO);
+
+        errorLogger.setNextLogger(fileLogger);
+        fileLogger.setNextLogger(consoleLogger);
+
+        return errorLogger;
+    }
+
+    public static void main(String[] args) {
+        AbstractLogger loggerChain = getChainOfLoggers();
+
+        loggerChain.logMessage(AbstractLogger.INFO, "This is an information.");
+
+        loggerChain.logMessage(AbstractLogger.DEBUG,"This is a debug level information.");
+
+        loggerChain.logMessage(AbstractLogger.ERROR,"This is an error information.");
+    }
+
+}