日志管理框架：Log4j工具封装类

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：

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,E
log4j.rootLogger = debug,stdout,debug,info,error

### 输出信息到控制抬 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.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.RollingFileAppender
log4j.appender.debug.File = E://logs/debug.log
log4j.appender.debug.Append = true
log4j.appender.debug.Threshold = DEBUG 
log4j.appender.debug.layout = org.apache.log4j.PatternLayout
log4j.appender.debug.MaxFileSize=10KB
log4j.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.RollingFileAppender
log4j.appender.info.File = E://logs/info.log
log4j.appender.info.Append = true
log4j.appender.info.Threshold = INFO 
log4j.appender.info.layout = org.apache.log4j.PatternLayout
log4j.appender.info.MaxFileSize=10KB
log4j.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.RollingFileAppender
log4j.appender.error.File =E://logs/error.log 
log4j.appender.error.Append = true
log4j.appender.error.Threshold = ERROR 
log4j.appender.error.layout = org.apache.log4j.PatternLayout
log4j.appender.error.MaxFileSize=10KB
log4j.appender.error.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n