tds/src/main/java/thredds/server/reify/DownloadController.java
static protected String escapeString(String s)
    {
        StringBuilder buf = new StringBuilder();
        for(int i = 0; i < s.length(); i++) {
            int c = s.charAt(i);
            switch (c) {
            case '"':
                buf.append("\\\"");
                break;
            case '\\':
                buf.append("\\\\");
                break;
            case '\n':
                buf.append('\n');
                break;
            case '\r':
                buf.append('\r');
                break;
            case '\t':
                buf.append('\r');
                break;
            case '\f':
                buf.append('\f');
                break;
            default:
                if(c < ' ')
                    buf.append(String.format("\\x%02x", (c & 0xff)));
                else
                    buf.append((char) c);
                break;
            }
        }
        return buf.toString();
    }
static protected String escapeString(String s)
    {
        StringBuilder buf = new StringBuilder();
        for(int i = 0; i < s.length(); i++) {
            int c = s.charAt(i);
            switch (c) {
            case '"':
                buf.append("\\\"");
                break;
            case '\\':
                buf.append("\\\\");
                break;
            case '\n':
                buf.append('\n');
                break;
            case '\r':
                buf.append('\r');
                break;
            case '\t':
                buf.append('\r');
                break;
            case '\f':
                buf.append('\f');
                break;
            default:
                if(c < ' ')
                    buf.append(String.format("\\x%02x", (c & 0xff)));
                else
                    buf.append((char) c);
                break;
            }
        }
        return buf.toString();
    }
Given a typical string, insert backslashes
before '"' and '\\' characters and control characters.