blocks|key|1504953|text|我已经到了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1504954|+SimpleFormatter+fmt+=+new+SimpleFormatter();
+StreamHandler+sh+=+new+StreamHandler(System.out,+fmt);
+logger.addHandler(sh);|code-block|syntax|javascript|1504955|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've arrived at

<pre><code> SimpleFormatter fmt = new SimpleFormatter();
 StreamHandler sh = new StreamHandler(System.out, fmt);
 logger.addHandler(sh);
</code></pre>

blocks|key|1720163|text|嗯，我只是被咬了几次脚，试图完成这一壮举。在用谷歌搜索之前，我设法想出了下面的技巧。很难看，但它似乎能完成工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1720164|public+class+StdoutConsoleHandler+extends+ConsoleHandler+{
++protected+void+setOutputStream(OutputStream+out)+throws+SecurityException+{
++++super.setOutputStream(System.out);+//+kitten+killed+here+:-(
++}
}|code-block|syntax|javascript|1720165|注意:从构造函数调用setOutputStream()很诱人，但它确实(正如Jon+Skeet已经指出的那样)关闭了System.err。疯狂的技能！|1720166|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Hmm I just got bit in the foot a few times, trying to accomplish this feat. Before googling my way here I managed to conjure the following hack. Ugly, but it seems to get the job done.

<pre><code>public class StdoutConsoleHandler extends ConsoleHandler {
 protected void setOutputStream(OutputStream out) throws SecurityException {
 super.setOutputStream(System.out); // kitten killed here :-(
 }
}
</code></pre>

Watch out: Calling setOutputStream() from the constructor is tempting, but it does (as Jon Skeet already pointed out) close System.err. Mad skills!

blocks|key|1719842|text|我想出了一个办法。首先删除默认的控制台处理程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1719843|setUseParentHandlers(假)；|1719844|然后在构造函数中创建ConsoleHandler的子类：|1719845|setOutputStream(System.out)；|1719846|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I figured out one way. First remove the default console handler:

setUseParentHandlers(false);

Then subclass ConsoleHandler and in the constructor:

setOutputStream(System.out);

blocks|key|1504883|text|Handler+consoleHandler+=+new+Handler(){
+++++++++@Override
++++++++++++public+void+publish(LogRecord+record)
++++++++++++{
++++++++++++++++if+(getFormatter()+==+null)
++++++++++++++++{
++++++++++++++++++++setFormatter(new+SimpleFormatter());
++++++++++++++++}

++++++++++++++++try+{
++++++++++++++++++++String+message+=+getFormatter().format(record);
++++++++++++++++++++if+(record.getLevel().intValue()+>=+Level.WARNING.intValue())
++++++++++++++++++++{
++++++++++++++++++++++++System.err.write(message.getBytes());+++++++++++++++++++++++
++++++++++++++++++++}
++++++++++++++++++++else
++++++++++++++++++++{
++++++++++++++++++++++++System.out.write(message.getBytes());
++++++++++++++++++++}
++++++++++++++++}+catch+(Exception+exception)+{
++++++++++++++++++++reportError(null,+exception,+ErrorManager.FORMAT_FAILURE);
++++++++++++++++}

++++++++++++}

++++++++++++@Override
++++++++++++public+void+close()+throws+SecurityException+{}
++++++++++++@Override
++++++++++++public+void+flush(){}
++++++++};|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1504884|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Handler consoleHandler = new Handler(){
 @Override
 public void publish(LogRecord record)
 {
 if (getFormatter() == null)
 {
 setFormatter(new SimpleFormatter());
 }

 try {
 String message = getFormatter().format(record);
 if (record.getLevel().intValue() &gt;= Level.WARNING.intValue())
 {
 System.err.write(message.getBytes()); 
 }
 else
 {
 System.out.write(message.getBytes());
 }
 } catch (Exception exception) {
 reportError(null, exception, ErrorManager.FORMAT_FAILURE);
 }

 }

 @Override
 public void close() throws SecurityException {}
 @Override
 public void flush(){}
 };
</code></pre>

blocks|key|1505109|text|我也遇到过类似的问题。我想要将信息和以下内容记录到System.out中，并将警告和以上内容记录到System.err中。下面是我实现的解决方案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1505110|public+class+DualConsoleHandler+extends+StreamHandler+{

++++private+final+ConsoleHandler+stderrHandler+=+new+ConsoleHandler();

++++public+DualConsoleHandler()+{
++++++++super(System.out,+new+SimpleFormatter());
++++}

++++@Override
++++public+void+publish(LogRecord+record)+{
++++++++if+(record.getLevel().intValue()+<=+Level.INFO.intValue())+{
++++++++++++super.publish(record);
++++++++++++super.flush();
++++++++}+else+{
++++++++++++stderrHandler.publish(record);
++++++++++++stderrHandler.flush();
++++++++}
++++}
}|code-block|syntax|javascript|1505111|当然，例如，您可以通过分解对Level.INFO的硬编码引用来使其更加灵活。但这对我来说工作得很好，可以获得一些基本的双流日志。(顺便说一句，关于避免关闭System.err的ConsoleHandler子类化的技巧非常有用。)|1505112|entityMap^0|P|A|1D|A|0|0|E|A|25|A|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

I had a similar problem. I wanted to log INFO and below to <code>System.out</code>, and WARNING and above to <code>System.err</code>. Here is the solution I implemented:

<pre><code>public class DualConsoleHandler extends StreamHandler {

 private final ConsoleHandler stderrHandler = new ConsoleHandler();

 public DualConsoleHandler() {
 super(System.out, new SimpleFormatter());
 }

 @Override
 public void publish(LogRecord record) {
 if (record.getLevel().intValue() &lt;= Level.INFO.intValue()) {
 super.publish(record);
 super.flush();
 } else {
 stderrHandler.publish(record);
 stderrHandler.flush();
 }
 }
}
</code></pre>

Of course, you could make it more flexible by factoring out the hard-coded reference to <code>Level.INFO</code>, for example. But this worked well for me to get some basic dual-stream logging. (BTW, the tips about not subclassing ConsoleHandler to avoid closing the <code>System.err</code> were very useful.)

blocks|key|1504578|text|看一看ConsoleHandler的文档和源代码-我相信你可以很容易地编写一个只使用System.err而不是System.out的版本。(老实说，很遗憾ConsoleHandler不允许这样配置。)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1504579|然后，只需配置日志记录系统，以正常方式使用新的StdoutHandler+(或您称之为它的任何东西)。|1504580|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/util/logging/ConsoleHandler.html^0|3|E|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Have a look at the docs and source for <a href="http://java.sun.com/javase/6/docs/api/java/util/logging/ConsoleHandler.html" rel="nofollow noreferrer">ConsoleHandler</a> - I'm sure you could easily write a version which just uses System.err instead of System.out. (It's a shame that ConsoleHandler doesn't allow this to be configured, to be honest.)

Then it's just a case of configuring the logging system to use your new StdoutHandler (or whatever you call it) in the normal way.

blocks|key|1719761|text|如果使用Java日志记录，则可以更改默认处理程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1719762|例如，对于文件:Logger.getLogger+fh+=新的文件名(FileHandler)；Logger.getLogger(LOGGER_NAME).addHandler(fh)；|1719763|如果你想输出到一个流，你可以使用StreamHandler，我认为你可以用你喜欢的任何输出流来配置它，包括系统流。|1719764|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

If you use Java logging, you can change the default handler:

For example, for files:
 Handler fh = new FileHandler(FILENAME);
 Logger.getLogger(LOGGER_NAME).addHandler(fh);

If you want to output to a stream you can use StreamHandler, I think you can configure it with any output stream that you woud like, including the system stream.

blocks|key|1720282|text|ConsoleHandler将在构造期间捕获System.err的快照。一种选择是将全局错误流与全局输出流交换，然后创建ConsoleHandler。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1720283|ConsoleHandler+h+=+null;
final+PrintStream+err+=+System.err;
System.setErr(System.out);
try+{
++++h+=+new+ConsoleHandler();+//Snapshot+of+System.err
}+finally+{
++++System.setErr(err);
}|code-block|syntax|javascript|1720284|这假设代码具有修改错误流的权限，并且没有其他正在运行的代码正在访问错误流。简而言之，这是一种选择，但还有更安全的替代方案。|1720285|entityMap^0|M|A|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

The ConsoleHandler will grab a snapshot of <code>System.err</code> during construction. One option would be to swap the global error stream with the global out stream and then create the ConsoleHandler.

<pre><code>ConsoleHandler h = null;
final PrintStream err = System.err;
System.setErr(System.out);
try {
 h = new ConsoleHandler(); //Snapshot of System.err
} finally {
 System.setErr(err);
}
</code></pre>

This assumes that the code has permission to modify error stream and that no other running code is accessing the error stream. In short, this is an option but there are safer alternatives.

blocks|key|1505226|text|当我们创建一个新的ConsoleHandler对象时，默认的输出流是"system.err“。遗憾的是，Java没有为ConsoleHandler类提供任何公共方法来设置输出流。因此它只能在创建对象时设置。As+ConsoleHandler类扩展了StreamHandler，它有一个受保护的方法"setOutputStream“来显式设置输出流。要为ConsoleHandler设置输出流，只需在创建对象的新调用时覆盖此方法即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1505227|ConsoleHandler+consoleHandler+=+new+ConsoleHandler+(){
++++++++++++@Override
++++++++++++protected+synchronized+void+setOutputStream(OutputStream+out)+throws+SecurityException+{
++++++++++++++++super.setOutputStream(System.out);
++++++++++++}
++++++++};|code-block|syntax|javascript|1505228|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When we create a new ConsoleHandler object, default output stream is "system.err". Sadly Java doesn't provide any public method for ConsoleHandler class to set output stream. So it can be set only at the time of object creation. As ConsoleHandler class extends StreamHandler, which has a protected method "setOutputStream" to set output stream explicitly. To set output Stream for ConsoleHandler just override this method at the time of new call for object creation. 

<pre><code>ConsoleHandler consoleHandler = new ConsoleHandler (){
 @Override
 protected synchronized void setOutputStream(OutputStream out) throws SecurityException {
 super.setOutputStream(System.out);
 }
 };
</code></pre>

blocks|key|1719921|text|如果您设置了setUseParentHandlers(False)，则只有类设置了它。应用程序中的其他类仍然会将其传递给stderr。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1719922|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you set setUseParentHandlers(false); only THAT class has it set. Other classes in the app will still pass it thru to stderr.

blocks|key|1719997|text|只需在构造函数调用StreamHandler+(System.out，)中扩展Super。这将避免关闭System.err+-谢谢|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1719998|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Simply extend StreamHandler &amp; in the constructor call Super(System.out,). This will avoid closing System.err - Thanks

I'm using the standard <code>ConsoleHandler</code> from <code>java.util.logging</code> and by default the console output is directed to the error stream (i.e. <code>System.err</code>).

How do I change the console output to the output stream (i.e. <code>System.out</code>)?

How do I change java logging console output from std err to std out?

我使用的是来自java.util.logging的标准ConsoleHandler，默认情况下，控制台输出被定向到错误流(即System.err)。如何将控制台输出更改为输出流(即System.out)？

问如何将java日志控制台输出从std err更改为std out？
EN

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问如何将java日志控制台输出从std err更改为std out？EN

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问如何将java日志控制台输出从std err更改为std out？
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