Merge pull request giantray#32 from andyfeng101/master

怎么样将堆栈追踪信息转换为字符串类型

Author: giantray

contents/how-can-i-convert-a-stack-trace-to-a-string.md

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+#怎么样将堆栈追踪信息转换为字符串类型
+##问题
+将`Throwable.getStackTrace()`的结果转换为一个字符串来来描述堆栈信息的最简单的方法是什么
+
+
+###最佳答案
+可以用下面的方法将异常堆栈信息转换为字符串类型。该类在Apache commons-lang-2.2.jar中可以找到：
+[`org.apache.commons.lang.exception.ExceptionUtils.getStackTrace(Throwable)`](org.apache.commons.lang.exception.ExceptionUtils.getStackTrace\(Throwable\))
+
+###答案二
+用 [`Throwable.printStackTrace(PrintWriter pw)`](https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html#printStackTrace-java.io.PrintWriter-)将对堆栈信息发送到一个输出中：
+````java
+StringWriter sw = new StringWriter();
+PrintWriter pw = new PrintWriter(sw);
+t.printStackTrace(pw);
+sw.toString(); // stack trace as a string
+````
+
+###答案三
+````java
+StringWriter sw = new StringWriter();
+e.printStackTrace(new PrintWriter(sw));
+String exceptionAsString = sw.toString();
+````
+
+###答案四
+````java
+public String stackTraceToString(Throwable e) {
+    StringBuilder sb = new StringBuilder();
+    for (StackTraceElement element : e.getStackTrace()) {
+        sb.append(element.toString());
+        sb.append("\n");
+    }
+    return sb.toString();
+}
+````
+
+stackoverflow链接：
+http://stackoverflow.com/questions/1149703/how-can-i-convert-a-stack-trace-to-a-string