LogUtil.java
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package com.hjx.personalcenter.util;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class LogUtil
{
private static com.hjx.personalcenter.util.LogUtil _lg;
//single
public static com.hjx.personalcenter.util.LogUtil Instance(){
if(_lg == null){
_lg = new com.hjx.personalcenter.util.LogUtil();
}
return _lg;
}
//日志保存的数量 ,默认保存最近10天的日志
public int logSaveNum=10;
/**插入日志*/
public void WriteLog(String msg){
if(LOG_SWITCH){
System.out.println("插入日子的信息：" + msg);
File file = checkLogFileIsExist();
if(file == null)
return;
FileOutputStream fos = null;
try
{
fos = new FileOutputStream(file, true);
fos.write((new Date().toLocaleString() + " " + msg).getBytes("gbk"));
fos.write("\r\n".getBytes("gbk"));
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
finally{
try
{
if(fos != null){
fos.close();
fos = null;
}
}
catch (IOException e)
{
e.printStackTrace();
}
fos = null;
file = null;
}
}
}
/**
* 打印异常堆栈信息
* @param e
* @return
*/
public void WriteStackTrace(Throwable e){
if(e != null){
//StringWriter sw = new StringWriter();
//PrintWriter pw = new PrintWriter(sw);
//e.printStackTrace(pw);
//return sw.toString();
WriteLog(e.getStackTrace().toString());
}
//return "";
}
private LogUtil()
{
CheckLogDele();
}
private void CheckLogDele()
{
//todo 扫描sd卡下面的日志文件，删除超过logSaveNum的日志
}
/**日志保存路径*/
private static final String LOG_SAVE_PATH = "/sdcard/Log/"; //sd卡上的日志文件目录
/**日志开关*/
private static final boolean LOG_SWITCH = true;
/**检查日志文件是否存在*/
private File checkLogFileIsExist(){
//if(!MemorySpaceManager.isSDExist()){ //sd 卡是否存在
// return null;
//}
File file = new File(LOG_SAVE_PATH);
if(!file.exists()){
file.mkdirs();
}
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdf.format(new Date());
file = new File(LOG_SAVE_PATH + dateStr + ".txt");
if(!isLogExist(file)){
try
{
file.createNewFile();
}
catch (IOException e)
{
e.printStackTrace();
}
}
sdf = null;
return file;
}
/**
* 检查当天日志文件是否存在
* @param file
* @return
*/
private boolean isLogExist(File file){
File tempFile = new File(LOG_SAVE_PATH);
File[] files = tempFile.listFiles();
if(files!=null){
for(int i = 0; i < files.length; i++){
if(files[0].getName().trim().equalsIgnoreCase(file.getName())){
return true;
}
}
}
return false;
}
}