java异步写日志到文件中

直接上代码了，一共3个类。

 

 

 

package com.tydic.ESUtil;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.InputStream;import java.io.PrintWriter;import java.util.Properties;public class LogWriter {//  日志的配置文件public static final String LOG_CONFIGFILE_NAME = "log.properties";//  日志文件名在配置文件中的标签public static final String LOGFILE_TAG_NAME = "logfile";//默认的日志文件的路径和文件名称private final String DEFAULT_LOG_FILE_NAME = "./logtext.log";//该类的唯一的实例private static LogWriter logWriter;//  文件输出流private PrintWriter writer;  //  日志文件名private String logFileName; /** * 默认构造函数 */private LogWriter() throws LogException{this.init();}private LogWriter(String fileName) throws LogException{this.logFileName = fileName;this.init();}/** * 获取LogWriter的唯一实例。 * @return * @throws LogException */public synchronized static LogWriter getLogWriter()throws LogException{if (logWriter == null){logWriter = new LogWriter();}return logWriter;}public synchronized static LogWriter getLogWriter(String logFileName)throws LogException{if (logWriter == null){logWriter = new LogWriter(logFileName);}return logWriter;}/** * 往日志文件中写一条日志信息 * 为了防止多线程同时操作(写)日志文件，造成文件”死锁”。使用synchronized关键字 * @param logMsg日志消息 */public synchronized void log(String logMsg) {this.writer.println(new java.util.Date() + ": " + logMsg);}/** * 往日志文件中写一条异常信息 * 使用synchronized关键字。 * @param ex待写入的异常 */public synchronized void log(Exception ex) {writer.println(new java.util.Date() + ": ");ex.printStackTrace(writer);}/** * 初始化LogWriter * @throws LogException */private void init() throws LogException{//如果用户没有在参数中指定日志文件名，则从配置文件中获取。if (this.logFileName == null){this.logFileName = this.getLogFileNameFromConfigFile();//如果配置文件不存在或者也没有指定日志文件名，则用默认的日志文件名。if (this.logFileName == null){this.logFileName = DEFAULT_LOG_FILE_NAME;}}File logFile = new File(this.logFileName);try {//其中的FileWriter()中的第二个参数的含义是:是否在文件中追加内容//  PrintWriter()中的第二个参数的含义是：自动将数据flush到文件中writer = new PrintWriter(new FileWriter(logFile, true), true);System.out.println("日志文件的位置：" + logFile.getAbsolutePath());} catch (IOException ex) {String errmsg = "无法打开日志文件:" + logFile.getAbsolutePath();//  System.out.println(errmsg);throw new LogException(errmsg, ex);}}/** * 从配置文件中取日志文件名 * @return */private String getLogFileNameFromConfigFile() { try { Properties pro = new Properties(); //在类的当前位置,查找属性配置文件log.properties InputStream fin = getClass().getResourceAsStream(LOG_CONFIGFILE_NAME); if (fin != null){pro.load(fin);//载入配置文件fin.close(); return pro.getProperty(LOGFILE_TAG_NAME);} else {System.err.println("无法打开属性配置文件: log.properties" ); }}catch (IOException ex) { System.err.println("无法打开属性配置文件: log.properties" ); }return null;}//关闭LogWriterpublic void close() {logWriter = null;if (writer != null){writer.close();}}public static void main(String[] args) {LogWriter logger = null;try {String fileName = "d:/temp/logger.log";logger = LogWriter.getLogWriter(fileName);//logger.log("First log!");//logger.log("第二个日志信息");//logger.log("Third log");//logger.log("第四个日志信息");   String content="tableaA|device_number|13701010";   StringBuffer sb=new StringBuffer();   for(int i=0;i<1000000;i++){   sb.append(content).append(i).append(";\n");   }   content=sb.toString();   long startTime=System.currentTimeMillis();   logger.log(content);long endTime=System.currentTimeMillis();System.out.println("总消耗时间："+(endTime-startTime));logger.close();//ReadFromFile.readFileByLines(fileName);} catch (LogException e) {e.printStackTrace();}}}

 

 

package com.tydic.ESUtil;public class AychWriter extends Thread {private String content;public AychWriter(String content){this.content=content;}@Overridepublic void run(){System.out.println("开始执行run()");LogWriter logger = null;String fileName = "d:/temp/logger.log";   long startTime=System.currentTimeMillis();try {logger = LogWriter.getLogWriter(fileName);logger.log(this.content);} catch (LogException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}long endTime=System.currentTimeMillis();System.out.println("总消耗时间："+(endTime-startTime));}}

 

测试类：

package com.tydic.ESUtil;import java.io.FileWriter;import java.io.IOException;import org.junit.Test;public class test_test {/** * 同步向指定文件尾部写入字符串 */public  void testAppendMethodB(String fileName,String content) throws IOException{try {//打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件FileWriter writer = new FileWriter(fileName, true);writer.write(content);writer.close();} catch (IOException e) {e.printStackTrace();}}/** *调用上面同步写方法  */@Testpublic void testWriteTOFile() throws IOException{String fileName = "d:\\test.txt";   String content="tableaA|device_number|13701010";   StringBuffer sb=new StringBuffer();   for(int i=0;i<100000;i++){   sb.append(content).append(i).append(";\n");   }   content=sb.toString();   long startTime=System.currentTimeMillis();   testAppendMethodB(fileName,content);long endTime=System.currentTimeMillis();System.out.println("总消耗时间："+(endTime-startTime));}/** * 异步调用写方法 * @throws IOException * @throws InterruptedException */@Testpublic void testAsyncWriteTOFile() throws IOException, InterruptedException{String fileName = "d:\\test.txt";   String content="tableaA|device_number|13701010";   StringBuffer sb=new StringBuffer();   for(int i=0;i<100000;i++){   sb.append(content).append(i).append(";\n");   }   content=sb.toString();   System.out.println("start write...");   new AychWriter(content).start();   System.out.println("write over...");   Thread.sleep(30000); //重要，如果主线程挂了，调用线程也停止了   System.out.println("main Thread over");}}