Java Throwable to String getStackTrace(Throwable throwable)

Description

Gets the stack trace from a Throwable as a String.

License

Apache License

Parameter

Parameter	Description
throwable	the <code>Throwable</code> to be examined

Return

the stack trace as generated by the exception's printStackTrace(PrintWriter) method

Declaration

public static String getStackTrace(Throwable throwable) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2012 Internet2//from  w  w  w.  java2  s. c om
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringWriter;

import java.io.Writer;

public class Main {
    /**
     * The name says it all.
     */
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    /**
     * <p>Gets the stack trace from a Throwable as a String.</p>
     *
     * @param throwable  the <code>Throwable</code> to be examined
     * @return the stack trace as generated by the exception's
     *  <code>printStackTrace(PrintWriter)</code> method
     */
    public static String getStackTrace(Throwable throwable) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw, true);
        throwable.printStackTrace(pw);
        return sw.getBuffer().toString();
    }

    /**
     * Get the contents of an <code>InputStream</code> as a String.
     * @param input the <code>InputStream</code> to read from
     * @param encoding The name of a supported character encoding. See the
     *   <a href="http://www.iana.org/assignments/character-sets">IANA
     *   Charset Registry</a> for a list of valid encoding types.
     * @return the requested <code>String</code>
     * @throws IOException In case of an I/O problem
     */
    public static String toString(InputStream input, String encoding) throws IOException {
        StringWriter sw = new StringWriter();
        copy(input, sw, encoding);
        return sw.toString();
    }

    /**
     * Copy and convert bytes from an <code>InputStream</code> to chars on a
     * <code>Writer</code>, using the specified encoding.
     * @param input the <code>InputStream</code> to read from
     * @param output the <code>Writer</code> to write to
     * @param encoding The name of a supported character encoding. See the
     * <a href="http://www.iana.org/assignments/character-sets">IANA
     * Charset Registry</a> for a list of valid encoding types.
     * @throws IOException In case of an I/O problem
     */
    public static void copy(InputStream input, Writer output, String encoding) throws IOException {
        InputStreamReader in = new InputStreamReader(input, encoding);
        copy(in, output);
    }

    /**
     * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
     * @param input the <code>Reader</code> to read from
     * @param output the <code>Writer</code> to write to
     * @return the number of characters copied
     * @throws IOException In case of an I/O problem
     */
    public static int copy(Reader input, Writer output) throws IOException {
        char[] buffer = new char[DEFAULT_BUFFER_SIZE];
        int count = 0;
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
    }
}

Related

1. getStackTrace(Throwable t)
2. getStackTrace(Throwable t0)
3. getStackTrace(Throwable tException)
4. getStackTrace(Throwable th)
5. getStackTrace(Throwable throwable)
6. getStackTrace(Throwable throwable)
7. getStackTrace(Throwable throwable)
8. getStackTrace(Throwable throwable)
9. getStackTrace(Throwable thrown)