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
以下代码允许您使用字符串格式获取整个stackTrace,而无需使用log4J或java.util.Logger等API:
catch (Exception e) {
StackTraceElement[] stack = e.getStackTrace();
String exception = "";
for (StackTraceElement s : stack) {
exception = exception + s.toString() + "\n\t\t";
}
System.out.println(exception);
// then you can send the exception string to a external file.
}
其他回答
使用Java 8流API,您可以执行以下操作:
Stream
.of(throwable.getStackTrace())
.map(StackTraceElement::toString)
.collect(Collectors.joining("\n"));
它将获取堆栈跟踪元素的数组,将它们转换为字符串并连接为多行字符串。
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 ) ;
Kotlin>=1.4
在Throwable上使用内置函数stackTraceToString()。
Kotlin<1.4
扩展Throwable类将提供String属性error.stackTraceString:
val Throwable.stackTraceString: String
get() {
val sw = StringWriter()
val pw = PrintWriter(sw)
this.printStackTrace(pw)
return sw.toString()
}
我不久前写了一些方法,所以我想为什么不花我的两分钱。
/** @param stackTraceElements The elements to convert
* @return The resulting string */
public static final String stackTraceElementsToStr(StackTraceElement[] stackTraceElements) {
return stackTraceElementsToStr(stackTraceElements, "\n");
}
/** @param stackTraceElements The elements to convert
* @param lineSeparator The line separator to use
* @return The resulting string */
public static final String stackTraceElementsToStr(StackTraceElement[] stackTraceElements, String lineSeparator) {
return stackTraceElementsToStr(stackTraceElements, lineSeparator, "");
}
/** @param stackTraceElements The elements to convert
* @param lineSeparator The line separator to use
* @param padding The string to be used at the start of each line
* @return The resulting string */
public static final String stackTraceElementsToStr(StackTraceElement[] stackTraceElements, String lineSeparator, String padding) {
String str = "";
if(stackTraceElements != null) {
for(StackTraceElement stackTrace : stackTraceElements) {
str += padding + (!stackTrace.toString().startsWith("Caused By") ? "\tat " : "") + stackTrace.toString() + lineSeparator;
}
}
return str;
}
/** @param stackTraceElements The elements to convert
* @return The resulting string */
public static final String stackTraceCausedByElementsOnlyToStr(StackTraceElement[] stackTraceElements) {
return stackTraceCausedByElementsOnlyToStr(stackTraceElements, "\n");
}
/** @param stackTraceElements The elements to convert
* @param lineSeparator The line separator to use
* @return The resulting string */
public static final String stackTraceCausedByElementsOnlyToStr(StackTraceElement[] stackTraceElements, String lineSeparator) {
return stackTraceCausedByElementsOnlyToStr(stackTraceElements, lineSeparator, "");
}
/** @param stackTraceElements The elements to convert
* @param lineSeparator The line separator to use
* @param padding The string to be used at the start of each line
* @return The resulting string */
public static final String stackTraceCausedByElementsOnlyToStr(StackTraceElement[] stackTraceElements, String lineSeparator, String padding) {
String str = "";
if(stackTraceElements != null) {
for(StackTraceElement stackTrace : stackTraceElements) {
str += (!stackTrace.toString().startsWith("Caused By") ? "" : padding + stackTrace.toString() + lineSeparator);
}
}
return str;
}
/** @param e The {@link Throwable} to convert
* @return The resulting String */
public static final String throwableToStrNoStackTraces(Throwable e) {
return throwableToStrNoStackTraces(e, "\n");
}
/** @param e The {@link Throwable} to convert
* @param lineSeparator The line separator to use
* @return The resulting String */
public static final String throwableToStrNoStackTraces(Throwable e, String lineSeparator) {
return throwableToStrNoStackTraces(e, lineSeparator, "");
}
/** @param e The {@link Throwable} to convert
* @param lineSeparator The line separator to use
* @param padding The string to be used at the start of each line
* @return The resulting String */
public static final String throwableToStrNoStackTraces(Throwable e, String lineSeparator, String padding) {
if(e == null) {
return "null";
}
String str = e.getClass().getName() + ": ";
if((e.getMessage() != null) && !e.getMessage().isEmpty()) {
str += e.getMessage() + lineSeparator;
} else {
str += lineSeparator;
}
str += padding + stackTraceCausedByElementsOnlyToStr(e.getStackTrace(), lineSeparator, padding);
for(Throwable suppressed : e.getSuppressed()) {
str += padding + throwableToStrNoStackTraces(suppressed, lineSeparator, padding + "\t");
}
Throwable cause = e.getCause();
while(cause != null) {
str += padding + "Caused by:" + lineSeparator + throwableToStrNoStackTraces(e.getCause(), lineSeparator, padding);
cause = cause.getCause();
}
return str;
}
/** @param e The {@link Throwable} to convert
* @return The resulting String */
public static final String throwableToStr(Throwable e) {
return throwableToStr(e, "\n");
}
/** @param e The {@link Throwable} to convert
* @param lineSeparator The line separator to use
* @return The resulting String */
public static final String throwableToStr(Throwable e, String lineSeparator) {
return throwableToStr(e, lineSeparator, "");
}
/** @param e The {@link Throwable} to convert
* @param lineSeparator The line separator to use
* @param padding The string to be used at the start of each line
* @return The resulting String */
public static final String throwableToStr(Throwable e, String lineSeparator, String padding) {
if(e == null) {
return "null";
}
String str = padding + e.getClass().getName() + ": ";
if((e.getMessage() != null) && !e.getMessage().isEmpty()) {
str += e.getMessage() + lineSeparator;
} else {
str += lineSeparator;
}
str += padding + stackTraceElementsToStr(e.getStackTrace(), lineSeparator, padding);
for(Throwable suppressed : e.getSuppressed()) {
str += padding + "Suppressed: " + throwableToStr(suppressed, lineSeparator, padding + "\t");
}
Throwable cause = e.getCause();
while(cause != null) {
str += padding + "Caused by:" + lineSeparator + throwableToStr(e.getCause(), lineSeparator, padding);
cause = cause.getCause();
}
return str;
}
例子:
try(InputStream in = new FileInputStream(file)) {
...
} catch(IOException e) {
String exceptionToString = throwableToStr(e);
someLoggingUtility.println(exceptionToString);
...
}
打印:
java.io.FileNotFoundException: C:\test.txt (The system cannot find the file specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at com.gmail.br45entei.Example.main(Example.java:32)
如果你不想使用外部库,而且你不是为Android开发的,你可以创建这样的“扩展”方法:
public static String getStackTraceString(Throwable e) {
return getStackTraceString(e, "");
}
private static String getStackTraceString(Throwable e, String indent) {
StringBuilder sb = new StringBuilder();
sb.append(e.toString());
sb.append("\n");
StackTraceElement[] stack = e.getStackTrace();
if (stack != null) {
for (StackTraceElement stackTraceElement : stack) {
sb.append(indent);
sb.append("\tat ");
sb.append(stackTraceElement.toString());
sb.append("\n");
}
}
Throwable[] suppressedExceptions = e.getSuppressed();
// Print suppressed exceptions indented one level deeper.
if (suppressedExceptions != null) {
for (Throwable throwable : suppressedExceptions) {
sb.append(indent);
sb.append("\tSuppressed: ");
sb.append(getStackTraceString(throwable, indent + "\t"));
}
}
Throwable cause = e.getCause();
if (cause != null) {
sb.append(indent);
sb.append("Caused by: ");
sb.append(getStackTraceString(cause, indent));
}
return sb.toString();
}
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