日志框架实现实时修改，实时生效，具体框架思路（2）

本文详细介绍了如何使用工具类实现根据日志管理表创建log4j.properties配置文件的功能，包括关键路径解析、配置项生成以及文件写入流程。

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上次的文章中提到了：编写工具类，工具类中实现，根据日志管理表，创建log4j.properties配置文件。

工具类的具体实现如下：

package com.work.log.service.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;

import org.apache.log4j.Logger;

import com.work.log.bean.LogConfigBean;

public class BuildLog4jPropertiesFile {

private Logger LOG = Logger.getLogger(BuildLog4jPropertiesFile.class);
private static String WEB_INF_PATH = BuildLog4jPropertiesFile.class.getResource("/").getPath();
private static String LOG4J_BACK_PROP = "log4j_back.properties";
private static final String ENTER_CODE = "\r\n";
private static String LOG4J_PROPERTIES_NAME = "log4j.properties";
private static String LOG_PATH = WEB_INF_PATH+"../../../../logs/";
private static final String LAYOUT_PATTERN_VALUE = "%-d{yyyyMMdd HH:mm:ss} [%l] - [ %p ] %m%n";
private static final String LOG4J_APPEND_KEY_PREFIX = "log4j.appender.";

private static final String FILE_KEY_PREFIX = ".File";

private static final String DATE_PATTERN_KEY = ".DatePattern";

private static final String DATE_PATTERN_VALUE = "'.'yyyyMMdd";

private static final String MAX_FILE_SIZE_KEY_PREFIX = ".MaxFileSize";

private static final String MAX_BACKUP_INDEX = ".MaxBackupIndex";

private static final String LAYOUT_KEY_PREFIX = ".layout";

private static final String LAYOUT_VALUE = "org.apache.log4j.PatternLayout";

private static final String LAYOUT_PATTERN_KEY = ".layout.ConversionPattern";
private static final String LOG4J_KEY_PREFIX = "log4j.logger.";

private static final String FILE_APPEND_VALUE = "org.apache.log4j.DailyRollingFileAppender";

private static final String COMMA = ",";