怎么获取e.printStackTrace的内容并记录到log4j日志中

怎么获取e.printStackTrace的内容并记录到log4j日志中

源代码如下：已测试成功
import java.io.*;
public class ThrowableTest extends FileNotFoundException {
public static void main(String argv[]) {
try {
FileInputStream f = new FileInputStream("D:\\test.txt");
} catch (FileNotFoundException e) {
try {
PrintWriter p = new PrintWriter(new FileOutputStream("D:\\errors.txt"));
p.println("=== toString() ===");
p.println(e.toString()+"\n");
p.println("=== getLocalizedMessage() ===");
p.println(e.getLocalizedMessage());
p.println("=== getMessage() ===\n");
p.println(e.getMessage());
p.println("=== printStackTrace() ===");
e.printStackTrace(p);
p.flush();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}

不用重写，public void printstacktrace(printwriter s)，java本来有这个方法。 源代码如下：已测试成功 import java.io.*; public class throwabletest extends filenotfoundexception { public static void main(string argv[]) { try { fileinputstream f = new fileinputstream("d:\\test.txt"); } catch (filenotfoundexception e) { try { printwriter p = new printwriter(new fileoutputstream("d:\\errors.txt")); p.println("=== tostring() ==="); p.println(e.tostring()+"\n"); p.println("=== getlocalizedmessage() ==="); p.println(e.getlocalizedmessage()); p.println("=== getmessage() ===\n"); p.println(e.getmessage()); p.println("=== printstacktrace() ==="); e.printstacktrace(p); p.flush(); } catch (ioexception e1) { e1.printstacktrace(); } } } }