Escape JSON special characters in string by adding backslash (\) before - Java JSON

Java examples for JSON:JSON String

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Description

Escape JSON special characters in string by adding backslash (\) before

Demo Code

/*//from   ww  w .j a va2 s .c  o m
 * Copyright (c) 2008, ClearForest Ltd.
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 * 
 *       -    Redistributions of source code must retain the above 
 *          copyright notice, this list of conditions and the 
 *          following disclaimer.
 * 
 *       -    Redistributions in binary form must reproduce the above 
 *          copyright notice, this list of conditions and the 
 *          following disclaimer in the documentation and/or other 
 *          materials provided with the distribution. 
 * 
 *       -    Neither the name of ClearForest Ltd. nor the names of 
 *          its contributors may be used to endorse or promote 
 *          products derived from this software without specific prior 
 *          written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
//package com.java2s;

public class Main {
    /**
     * Escape JSON special characters in string by adding
     * backslash (\) before
     * @param str - string to escape
     * @return JSON-escaped string
     */
    public static String escapeForJSON(String str) {

        StringBuilder ret = new StringBuilder();
        int idx = 0;

        if (str == null) {
            return null;
        }

        while (idx < str.length()) {
            switch (str.charAt(idx)) {
            case '"':
                ret.append("\\\"");
                break;

            case '\\':
                ret.append("\\\\");
                break;

            case '/':
                ret.append("\\/");
                break;

            case '\b':
                ret.append("\\b");
                break;

            case '\f':
                ret.append("\\f");
                break;

            case '\n':
                ret.append("\\n");
                break;

            case '\r':
                ret.append("\\r");
                break;

            case '\t':
                ret.append("\\t");
                break;

            default:
                ret.append(str.charAt(idx));
                break;

            }

            idx++;
        }

        return ret.toString();
    }
}

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