java读写删指定目录txt文件.doc

packagecom.zmw.framework.common.util;
importjava.io.BufferedReader;
importjava.io.BufferedWriter;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.FileWriter;
importjava.io.IOException;
importjava.io.InputStreamReader;
importorg.apache.log4j.Logger;
publicclassAccessTokenTxt{
Stringaccess_token="";
publicvoidwriteFile(Stringkey)throwsIOException
{
this.access_token=key;
try
{
StringrootPath=System.getProperty("user.dir");//系统指定根目录/mnt/hljproject/tomcat/bin/demo.txt
StringfilePath=null;
if(rootPath.endsWith("/")){
filePath=rootPath+"demo.txt";
}else{
filePath=rootPath+"/demo.txt";
}
Filedir=newFile(filePath);
FileWriterfw=newFileWriter(dir);
BufferedWriterbw=newBufferedWriter(fw);
bw.write(access_token.trim());
bw.flush();
Logger.getLogger("wxpay").info("写入缓存,缓存地址["+filePath+"]-Access_token["+access_token+"]");

}catch(Exceptionex){
Logger.getLogger("wxpay").info("写入缓存异常");
}
}
publicStringreaderFile()throwsIOException
{
Stringaccess_token="";
StringfilePath=System.getProperty("user.dir")+"/demo.txt";
FileInputStreamfis=null;
try
{
fis=newFileInputStream(filePath);
InputStreamReaderreader=newInputStreamReader(fis,"UTF-8");
BufferedReaderbr=newBufferedReader(reader);
Stringinfo="";
while((info=br.readLine())!=null){
access_token=info;
}
br.close();
fis.close();
Logger.getLogger("wxpay").info("读取缓存,缓存地址["+filePath+"]-Access_token["+access_token+"]");
returnaccess_token;
}catch(Exceptionex){
Logger.getLogger("wxpay").info("读取缓存异常");
returnnull;
}
}
publicvoidclearFileContent()throwsIOException
{
StringfilePath=System.getProperty("user.dir")+"/demo.txt";
try
{
FileOutputStreamout=newFileOutputStream(filePath,false);
out.write(newString("").getBytes());
out.close();
}catch(Exceptionex){
Logger.getLogger("wxpay").info("清空缓存异常");
}
}

}