为保存服务器的操作记录以及一些必要的信息记录，建立此工具类。
大分组 2019-11，以下按日生成txt日志。
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Logger {
private static Logger l;
private static final String base_path="D:\\logs\\car_rent";
private static final SimpleDateFormat sdf_year_month = new SimpleDateFormat("yyyy-MM");
private static final SimpleDateFormat sdf_day = new SimpleDateFormat("dd");
public static Logger instance() {
if(l==null) {
synchronized (Logger.class) {
if(l==null) {
l=new Logger();
}
}
}
return l;
}
private Logger() {
File filebase=new File(base_path);
if(!filebase.exists()) {
filebase.mkdir();
}
}
private String today;
private String month_path;
private String current_path;
public void out(String message) {
try {
Date date=new Date();
today=sdf_day.format(date);
month_path = base_path + "\\" + sdf_year_month.format(date);
File file=new File(month_path);
if(!file.exists()) {
file.mkdir();
}
current_path = month_path + "\\" + today+".txt";
file=new File(current_path);
FileOutputStream fos=null;
if(!file.exists()) {
file.createNewFile();
fos = new FileOutputStream(file);
}else {
fos = new FileOutputStream(file, true);
}
OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");
osw.write("["+MySystem.getLogTime()+"] ");
osw.write(message);
osw.write("\r\n"); //换行
try {
if (osw != null) {
osw.close();
}
} catch (IOException e) {
System.err.println(e.getMessage());
}
try {
if (fos != null) {
fos.close();
}
}catch (IOException e) {
System.err.println(e.getMessage());
}
System.out.println("[日志保存成功]["+message+"]");
}catch(Exception e) {
System.err.println("无法输出日志["+message+"]["+e.getMessage()+"]");
}
}
}
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