Java 如何将堆栈跟踪打印到页面？

如何将异常堆栈跟踪打印到网页

import com.opensymphony.xwork2.ActionSupport;
import java.util.Arrays;

public class ExceptionAction extends ActionSupport 
{

 public String execute() 
 {      
    //
    String errMsg = Arrays.toString(Thread.currentThread().getStackTrace());

    this.addActionError(
                    "Unexcepted error has occurred. \n"
                    +errMsg
                    + "\nPlease try again or report this error to    administrator or support team. \n ");

    return "error";
 }

 /**
 * 
 */
 private static final long serialVersionUID = -3754090784536811052L;
}

但我得到了一个无用的味精使用上述代码，味精是这样的：

    [java.lang.Thread.getStackTrace(Thread.java:1479),    com.monitoring.action.ExceptionAction.execute(ExceptionAction.java:11), sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method), sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39), 

看

---

另请参见

这里是将堆栈跟踪打印到页面的代码

 package test;    
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {

        PrintWriter out = response.getWriter();
        try {
            "test".charAt(20);
        } catch (RuntimeException e) {
            out.println("Stack Trace:<br/>");
            e.printStackTrace(out);
            out.println("<br/><br/>Stack Trace (for web display):</br>");
            out.println(displayErrorForWeb(e));
        }
    }

    public String displayErrorForWeb(Throwable t) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        t.printStackTrace(pw);
        String stackTrace = sw.toString();
        return stackTrace.replace(System.getProperty("line.separator"), "<br/>\n");
    }

}

封装测试；
导入java.io.IOException；
导入java.io.PrintWriter；
导入java.io.StringWriter；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
公共类TestServlet扩展了HttpServlet{
私有静态最终长serialVersionUID=1L；
受保护的void doGet（HttpServletRequest请求、HttpServletResponse响应）引发IOException{
PrintWriter out=response.getWriter（）；
试一试{
“测试”，查拉特（20）；
}捕获（运行时异常e）{
out.println（“堆栈跟踪：
”）；
e、 打印跟踪（输出）；
out.println（“

堆栈跟踪（用于web显示）：
”；
out.println（displayErrorForWeb（e））；
}
}
Web的公共字符串显示错误（Throwable t）{
StringWriter sw=新的StringWriter（）；
PrintWriter pw=新的PrintWriter（sw）；
t、 printStackTrace（pw）；
String stackTrace=sw.toString（）；
返回stackTrace.replace（System.getProperty（“line.separator”），“
\n”）；
}
}

---

来源：

你指的是网页，还是我的工作网页？或者在网页上？尝试在发生异常的地方抛出异常，所有跟踪都应该在网页上，但我认为这对解决您的问题没有帮助。通常，您不希望在网页上打印堆栈跟踪。它可以揭示很多信息，并帮助人们在未经您同意的情况下访问您的服务器：）这里有许多选项：包括Guava和commons lang的实用方法

 package test;    
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {

        PrintWriter out = response.getWriter();
        try {
            "test".charAt(20);
        } catch (RuntimeException e) {
            out.println("Stack Trace:<br/>");
            e.printStackTrace(out);
            out.println("<br/><br/>Stack Trace (for web display):</br>");
            out.println(displayErrorForWeb(e));
        }
    }

    public String displayErrorForWeb(Throwable t) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        t.printStackTrace(pw);
        String stackTrace = sw.toString();
        return stackTrace.replace(System.getProperty("line.separator"), "<br/>\n");
    }

}