java 在文件中记录异常日志

import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;public class ExceptionDefaultHandler {private final static String exceptionLogFile = "TextFile/txt/exception.log"; private static boolean hasFile = false;private static void generateLogFile(){File file = new File(exceptionLogFile);if(!file.exists()){try{file.createNewFile();}catch(IOException EX){System.out.println(EX.toString());}}hasFile = true;}public static void handle(Exception ex){if(!hasFile){generateLogFile();}File file = new File(exceptionLogFile);if(file.canWrite()){PrintWriter streamWriter = null;try{streamWriter = new PrintWriter(new FileOutputStream(file, true));streamWriter.write("----------------------------------------------------------------");streamWriter.write(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));streamWriter.write("----------------------------------------------------------------");streamWriter.write(SystemProperties.newInstance().getLineSeparator());ex.printStackTrace(streamWriter);streamWriter.write(SystemProperties.newInstance().getLineSeparator());streamWriter.close();}catch(IOException EX){System.out.println(EX.toString());}finally{streamWriter.close();}}else{System.out.println("异常日志文件没有写权限");}}}