日志管理框架：Log4j工具封装类

来源：互联网发布：spring 获取端口号编辑：程序博客网时间：2024/05/16 12:48

做这个例子的初衷就是，把任何一个对象丢进框架中的对应的输出日志的方法中，都能输出这个对象所对应的toString重写方法，来输出对象的包含的数据，现在能实现:字符串，数组，List,Map集合的输出：

项目结构如下：

这里写图片描述

主工具类代码Log4jUtil.java

package com.log4j.util;import java.lang.reflect.Array;/** * 记录日志的类 主要输出字符串 *  * @author Administrator *  */public class Log4jUtil {    private static Log4jUtil log4jUtil;    private Logger logger;    public Log4jUtil(String configPath) {        PropertyConfigurator.configure(configPath);        // this.logger = Logger.getRootLogger();        this.logger = Logger.getLogger(Log4jUtil.class);    }    public static Log4jUtil getLog4jUtil() {        if (log4jUtil == null) {            log4jUtil = new Log4jUtil("config/log4j.properties");        }        return log4jUtil;    }    public static void debug(String str) {        log4jUtil.logger.debug(str);    }    public static void info(String str) {        log4jUtil.logger.info(str);    }    public static void warn(String str) {        log4jUtil.logger.warn(str);    }    public static void error(String str) {        log4jUtil.logger.error(str);    }    public static void fatal(String str) {        log4jUtil.logger.fatal(str);    }    public static void main(String[] args) {        // 测试字符串        // testString();        // 测试数组        // Object[] array = new Object[] { "测试array", "测试array1", "测试array2" };        // testArray(array);        // 测试List集合        // //List放的是字符串        // List<String> list = new ArrayList<String>();        // list.add("测试list1");        // list.add("测试list2");        // list.add("测试list3");        // //List放的是对象。        // List<Student> list = new ArrayList<Student>();        // for (int i = 0; i < 3; i++) {        // Student s = new Student();        // s.setId(i);        // s.setName("name"+i);        // list.add(s);        // }        // testList(list);        //测试map集合        Map<Teacher, Student> map = new HashMap<Teacher, Student>();        for (int i = 0; i < 3; i++) {            Teacher t = new Teacher();            t.setId(i);            t.setName("teacher"+i);            Student s = new Student();            s.setId(i);            s.setName("student"+i);            map.put(t, s);        }        testMap(map);    }    public static void testString() {        Log4jUtil log4jUtil = Log4jUtil.getLog4jUtil();        String debug = "debug信息";        String warn = "warn信息";        String info = "info信息";        String error = "error信息";        String fatal = "fatal信息";        log4jUtil.debug(debug);        log4jUtil.warn(warn);        log4jUtil.info(info);        log4jUtil.error(error);        log4jUtil.fatal(fatal);    }    public static void testArray(Object[] array) {        Log4jUtil log4jUtil = Log4jUtil.getLog4jUtil();        int length = array.length;        for (int i = 0; i < length; i++) {            // System.out.println("第"+i+"号元素的值："+Array.get(array, i));            log4jUtil.debug("第" + i + "号元素的值：" + Array.get(array, i));        }    }    public static <T> void testList(List<T> list) {        Log4jUtil log4jUtil = Log4jUtil.getLog4jUtil();        if (list == null) {            log4jUtil.error("list=null");        } else if (list.size() == 0) {            log4jUtil.info("list.size()为0");        } else {            StringBuffer sb = new StringBuffer();            String s = new String("list中数据个数：" + list.size());            sb.append("\r\n" + s + "\r\nstart:----------------------\r\n");            for (T t : list) {                sb.append(t.toString() + "\r\n");// 这里List包含的类要有自定义的toString方法            }            sb.append("end----------------------\r\n");            log4jUtil.debug(sb.toString());        }    }    public static <V, K> void testMap(Map<K, V> map) {        // Map<Student, Student> mapTemp = new HashMap<Student, Student>();        Log4jUtil log4jUtil = Log4jUtil.getLog4jUtil();        if (map == null) {            log4jUtil.error("map=null");        } else if (map.size() == 0) {            log4jUtil.info("map.size()为0");        } else {            StringBuffer sb = new StringBuffer();            String s = new String("map中数据个数：" + map.size());            sb.append("\r\n" + s + "\r\nstart:----------------------\r\n");            for (K k : map.keySet()) {                sb.append("key[" + k.toString() + "]所对应的value:["                        + map.get(k).toString() + "]\r\n");// 这里List包含的类要有自定义的toString方法            }            sb.append("end----------------------\r\n");            log4jUtil.debug(sb.toString());        }    }    public static void test2() {        PropertyConfigurator.configure("config/log4j.properties");        // Logger logger = Logger.getLogger(Log4jTest1.class);        Logger logger = Logger.getRootLogger();        // for (int i = 0; i < 1000; i++) {        logger.debug("debug");        logger.info("info");        logger.error("error");        // }    }}

实体类Teacher.java

package com.log4j.model;public class Teacher {    private int id;    private String name;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    @Override    public String toString() {        return "Teacher [id=" + id + ", name=" + name + "]";    }}

实体类student.java

package com.log4j.model;public class Student {    private int id;    private String name;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    @Override    public String toString() {        return "Student [id=" + id + ", name=" + name + "]";    }}

log4j的配置文件

### 设置####log4j.rootLogger = debug,stdout,I,Elog4j.rootLogger = debug,stdout,debug,info,error### 输出信息到控制抬 ###log4j.appender.stdout = org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target = System.outlog4j.appender.stdout.layout = org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n### 输出INFO 级别以上的日志到=E://logs/debug.log ###log4j.appender.debug=org.apache.log4j.RollingFileAppenderlog4j.appender.debug.File = E://logs/debug.loglog4j.appender.debug.Append = truelog4j.appender.debug.Threshold = DEBUG log4j.appender.debug.layout = org.apache.log4j.PatternLayoutlog4j.appender.debug.MaxFileSize=10KBlog4j.appender.debug.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n### 输出INFO 级别以上的日志到=E://logs/info.log ###log4j.appender.info=org.apache.log4j.RollingFileAppenderlog4j.appender.info.File = E://logs/info.loglog4j.appender.info.Append = truelog4j.appender.info.Threshold = INFO log4j.appender.info.layout = org.apache.log4j.PatternLayoutlog4j.appender.info.MaxFileSize=10KBlog4j.appender.info.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n### 输出ERROR 级别以上的日志到=E://logs/error.log ###log4j.appender.error = org.apache.log4j.RollingFileAppenderlog4j.appender.error.File =E://logs/error.log log4j.appender.error.Append = truelog4j.appender.error.Threshold = ERROR log4j.appender.error.layout = org.apache.log4j.PatternLayoutlog4j.appender.error.MaxFileSize=10KBlog4j.appender.error.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

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