将需要书写的内容，以追加的方式写到文件中

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public void writeScriptLog(String writeInfo,Boolean isError) {
File folder =new File("目录");
try {
if (!folder.exists()) {
folder.mkdirs();
}
File logFile =new File("目录/文件");
if (!logFile.exists()) {
logFile.createNewFile();
}
FileOutputStream fos = null;
OutputStreamWriter osw =null;
fos = new FileOutputStream(logFile.getPath(), true);  
osw = new OutputStreamWriter(fos);
String data=new SimpleDateFormat("MM/dd HH:mm:ss").format(new Date());
if (!isError) {
osw.write(data+" Info："+writeInfo+ System.getProperty("line.separator"));
}else {
osw.write(data+" Error："+writeInfo+ System.getProperty("line.separator"));
}
osw.close();
} catch (Exception e) {
e.printStackTrace();
}
}