com.p6spy.engine.spy.appender.FileLogger Maven / Gradle / Ivy
/**
* P6Spy
*
* Copyright (C) 2002 - 2017 P6Spy
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.p6spy.engine.spy.appender;
import com.p6spy.engine.spy.P6SpyOptions;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
/**
* Appender which writes log messages to a file. This is the default appended for P6Spy.
*/
public class FileLogger extends StdoutLogger {
private String fileName = null;
private PrintStream printStream = null;
private void init() {
if (fileName == null) {
throw new IllegalStateException("setLogfile() must be called before init()");
}
try {
// 防止目录不存在报错！
// add by SUNHAO 2017-12-26
if (!new File(fileName).getParentFile().exists()) {
new File((fileName)).getParentFile().mkdirs();
}
printStream = new PrintStream(new FileOutputStream(fileName, P6SpyOptions.getActiveInstance().getAppend()));
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
@Override
protected PrintStream getStream() {
// Lazy init to allow for the appender to be changed at Runtime without creating an empty log file (assuming
// that no log message has been written yet)
if (printStream == null) {
synchronized (this) {
if (printStream == null) {
init();
}
}
}
return printStream;
}
public void setLogfile(String fileName) {
this.fileName = fileName;
}
}