jsonencoder.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 88 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package com.sun.jersey.impl.json.writer;

import java.util.Formatter;

/**
 *
 * @author japod
 */
public class JsonEncoder {

    public static String encode(String text) {
        if ((null == text) || (text.length() == 0)) {
            return text;
        }
        Formatter formatter = new java.util.Formatter();
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < text.length(); i++) {
            char c = text.charAt(i);
            switch (c) {
                case '"':
                    result.append("\\\"");
                    break;
                case '\\':
                    result.append("\\\\");
                    break;
                case '\b':
                    result.append("\\b");
                    break;
                case '\f':
                    result.append("\\f");
                    break;
                case '\n':
                    result.append("\\n");
                    break;
                case '\r':
                    result.append("\\r");
                    break;
                case '\t':
                    result.append("\\t");
                    break;
                default:
                    if (c < ' ') { // TODO: what about c > 255 ???
                        result.append(formatter.format("\\u%04X", (int)c));
                    } else {
                        result.append(c);
                    }
            }
        }
        return result.toString();
    }
}