将Throwable.getStackTrace()的结果转换为描述堆栈跟踪的字符串最简单的方法是什么?
当前回答
老问题,但我想补充一个特殊情况,即您不想打印所有堆栈,通过删除一些您实际上不感兴趣的部分,排除某些类或包。
使用SelectivePrintWriter代替PrintWriter:
// This filters out this package and up.
String packageNameToFilter = "org.springframework";
StringWriter sw = new StringWriter();
PrintWriter pw = new SelectivePrintWriter(sw, packageNameToFilter);
e.printStackTrace(pw);
String sStackTrace = sw.toString();
System.out.println(sStackTrace);
其中SelectivePrintWriter类由以下给出:
public class SelectivePrintWriter extends PrintWriter {
private boolean on = true;
private static final String AT = "\tat";
private String internal;
public SelectivePrintWriter(Writer out, String packageOrClassName) {
super(out);
internal = "\tat " + packageOrClassName;
}
public void println(Object obj) {
if (obj instanceof String) {
String txt = (String) obj;
if (!txt.startsWith(AT)) on = true;
else if (txt.startsWith(internal)) on = false;
if (on) super.println(txt);
} else {
super.println(obj);
}
}
}
请注意,这个类可能很容易被Regex、contains或其他条件过滤掉。还要注意,这取决于可丢弃的实现细节(不太可能改变,但仍然如此)。
其他回答
public static String getStackTrace(Throwable t) {
StringWriter sw = new StringWriter();
t.printStackTrace(new PrintWriter(sw));
return sw.toString();
}
如果你是为Android开发的,一个更简单的方法是使用这个:
import android.util.Log;
String stackTrace = Log.getStackTraceString(exception);
格式与getStacktrace相同,例如。
09-24 16:09:07.042:I/System.out(4844):java.lang.NullPointerException09-24 16:09:07.042:I/System.out(4844):在com.temp.ttscancel.MainActivity.onCreate(MainActivity.java:43)09-24 16:09:07.042:I/System.out(4844):在android.app.Activity.performCreate(Activity.java:5248)09-24 16:09:07.043:I/System.out(4844):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)09-24 16:09:07.043:I/System.out(4844):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)09-24 16:09:07.043:I/System.out(4844):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)09-24 16:09:07.043:I/System.out(4844):在android.app.ActivityThread.access$800(ActivityThread.java:139)09-24 16:09:07.043:I/System.out(4844):在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)09-24 16:09:07.043:I/System.out(4844):在android.os.Handler.dispatchMessage(Handler.java:102)09-24 16:09:07.043:I/System.out(4844):在android.os.Looper.lop(Looper.java:136)09-24 16:09:07.044:I/System.out(4844):在android.app.ActivityThread.main(ActivityThread.java:5097)09-24 16:09:07.044:I/System.out(4844):在java.lang.reflect.Method.invokeNative(本机方法)09-24 16:09:07.044:I/System.out(4844):在java.lang.reflect.Method.invoke(Method.java:515)09-24 16:09:07.044:I/System.out(4844):在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)09-24 16:09:07.044:I/System.out(4844):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
番石榴的丢弃类
如果您有实际的Throwables实例,GoogleGuava提供Throwables.getStackTraceAsString()。
例子:
String s = Throwables.getStackTraceAsString ( myException ) ;
没有java.io.*,它可以这样做。
String trace = e.toString() + "\n";
for (StackTraceElement e1 : e.getStackTrace()) {
trace += "\t at " + e1.toString() + "\n";
}
然后跟踪变量保存堆栈跟踪。输出也包含初始原因,输出与printStackTrace()相同
例如,printStackTrace()产生:
java.io.FileNotFoundException: / (Is a directory)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:270)
at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
at java.io.FileOutputStream.<init>(FileOutputStream.java:101)
at Test.main(Test.java:9)
当打印到stdout时,跟踪字符串保持
java.io.FileNotFoundException: / (Is a directory)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:270)
at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
at java.io.FileOutputStream.<init>(FileOutputStream.java:101)
at Test.main(Test.java:9)
将堆栈跟踪打印到PrintStream,然后将其转换为字符串:
// ...
catch (Exception e)
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
e.printStackTrace(new PrintStream(out));
String str = new String(out.toByteArray());
System.out.println(str);
}
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