org.codelabor.system.web.filter.EncodingFilter.java Source code

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Here is the source code for org.codelabor.system.web.filter.EncodingFilter.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.codelabor.system.web.filter;

import java.io.IOException;

import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ? 
 * 
 * @author Shin Sang-jae
 * 
 */
public class EncodingFilter extends BaseFilterImpl {
    /**
     * ? ? UTF-8? .
     */
    protected String encoding = "UTF-8";
    /**
     * 
     */
    private final Logger logger = LoggerFactory.getLogger(EncodingFilter.class);

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.codelabor.system.filters.BaseFilterImpl#init(javax.servlet.FilterConfig
     * )
     */
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        super.init(filterConfig);
        String tempEncoding = filterConfig.getInitParameter("encoding");
        if (!StringUtils.isEmpty(tempEncoding)) {
            encoding = tempEncoding;
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.codelabor.system.filters.BaseFilterImpl#postprocessFilterChain(javax
     * .servlet.ServletRequest, javax.servlet.ServletResponse)
     */
    @Override
    public void postprocessFilterChain(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.codelabor.system.filters.BaseFilterImpl#preprocessFilterChain(javax
     * .servlet.ServletRequest, javax.servlet.ServletResponse)
     */
    @Override
    public void preprocessFilterChain(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        String requestBeforeEncoding = request.getCharacterEncoding();
        String responseBeforeEncoding = response.getCharacterEncoding();

        if (encoding.equalsIgnoreCase(requestBeforeEncoding)) {
            logger.debug("request character encoding: {}", encoding);
        } else {
            request.setCharacterEncoding(encoding);
            String requestAfterEncoding = request.getCharacterEncoding();
            logger.debug("request character encoding: {} -> {}", requestBeforeEncoding, requestAfterEncoding);
        }
        if (encoding.equalsIgnoreCase(responseBeforeEncoding)) {
            logger.debug("response character encoding: {}", encoding);
        } else {
            response.setCharacterEncoding(encoding);
            String responseAfterCharacterEncoding = response.getCharacterEncoding();
            logger.debug("response character encoding: {} -> {}", responseBeforeEncoding,
                    responseAfterCharacterEncoding);
        }
    }
}