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我想實現可以將錯誤消息寫入日誌文件的OSGI bundle。我在代碼中存在一些我無法解決的錯誤。我評論了Netbeans給我錯誤的代碼。Java - 執行日誌代碼的錯誤
公共類LoggingSystemImpl實現LoggingSystem {Netbeans中
private final static Calendar calendar = Calendar.getInstance();
private final static String user = System.getenv("USERNAME").toLowerCase();
private final static String sMonth = calendar.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.ENGLISH);
private final static int y = calendar.get(Calendar.YEAR);
// the name of the log file
//private final String logName = sysDrive + "\\fttb_web - " + sMonth.toLowerCase() + ", " + y + ".log";
private final String logName = "logger - " + sMonth.toLowerCase() + ", " + y + ".log";
private static boolean closed;
private static Log log = null;
private static BufferedWriter bw = null;
private static FileOutputStream fos = null;
private static OutputStreamWriter osw = null;
public LoggingSystemImpl() {
}
public String LoggingSystemUtilization() throws FileNotFoundException{
return "ok";
}
private String Log() throws IOException
{
fos = new FileOutputStream(logName, true);
// set encoding to cyrillic (if available)
if (Charset.isSupported("windows-1251"))
{
osw = new OutputStreamWriter(fos, Charset.forName("windows-1251"));
}
else { osw = new OutputStreamWriter(fos); }
bw = new BufferedWriter(osw, 2048); // 2Mb buffer
return"ok";
}
// intro header for log session
public static synchronized Log getInstance() throws IOException
{
boolean exc = false;
try
{
if (log == null || closed)
{
log = new Log() {};
錯誤消息：不是抽象和sun.rmi.runtime.Log
不覆蓋抽象方法getPrintStream（） closed = false;
log.writeln("logged in.");
錯誤message：找不到符號 symbol：方法writeln（java.lang.String） location：sun.rmi.runtime.Log類型的變量日誌
log.nl();
錯誤消息：找不到符號 代碼：NL法（） 位置：類型的變量數sun.rmi.runtime.Log
}
}
catch(IOException x) { exc = true; throw x; }
catch(Exception x) { exc = true; x.printStackTrace(); }
finally
{
if (exc)
{
try
{
if (fos != null) { fos.close(); fos = null; }
if (osw != null) { osw.close(); fos = null; }
if (bw != null) { bw.close(); bw = null; }
}
catch(Exception x) { x.printStackTrace(); }
}
}
return log;
}
public synchronized void nl()
{
try { bw.newLine(); }
catch(IOException x) {x.printStackTrace();}
}
public synchronized void nl(int count)
{
try
{
for (int i = 0; i < count; i++) bw.newLine();
}
catch(IOException x) {x.printStackTrace();}
}
public synchronized void writeln(String s)
{
try { bw.write(getTime() + ": " + s); bw.newLine(); }
catch(IOException x) {x.printStackTrace();}
}
public synchronized void write(String s)
{
try { bw.write(s); }
catch (IOException x) {x.printStackTrace();}
}
public synchronized void close()
{
try
{
if (bw != null)
{
writeln("logged out.");
nl();
bw.flush();
bw.close();
closed = true;
fos = null;
osw = null;
bw = null;
}
}
catch(IOException x) { x.printStackTrace(); }
}
public synchronized boolean isClosed() { return closed; }
public synchronized void writeException(Exception x)
{
writeln("");
write("\t" + x.toString()); nl();
StackTraceElement[] ste = x.getStackTrace();
int j = 0;
for (int i = 0; i < ste.length; i++)
{
if (i < 15) { write("\t\tat " + ste[i].toString()); nl(); }
else { j++; }
}
if (j > 0) { write("\t\t... " + j + " more"); nl(); }
nl(2);
}
private String getTime()
{
Calendar c = Calendar.getInstance();
int month = c.get(Calendar.MONTH) + 1;
int d = c.get(Calendar.DAY_OF_MONTH);
int h = c.get(Calendar.HOUR_OF_DAY);
int m = c.get(Calendar.MINUTE);
int s = c.get(Calendar.SECOND);
int y = c.get(Calendar.YEAR);
String dd = d < 10 ? "0"+d : ""+d;
String hh = h < 10 ? "0"+h : ""+h;
String mm = m < 10 ? "0"+m : ""+m;
String ss = s < 10 ? "0"+s : ""+s;
String sm = month < 10 ? "0"+month : ""+month;
return user + " [" + y + "." + sm + "." + dd + " " + hh + ":" + mm + ":" + ss + "]";
}
}