setcontenttypetag.java

来自「jakarta-taglibs」· Java 代码 · 共 74 行

/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * 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.
 */

package org.apache.taglibs.response;

import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

/**
 * JSP Tag <b>setContentType</b>, used to set the content type for an
 * HTTP Response.
 * <p>
 * The content type is set to the content of the body of the <b>setContentType</b> tag.
 * <p>
 * JSP Tag Lib Descriptor
 * <p><pre>
 * &lt;name&gt;setContentType&lt;/name&gt;
 * &lt;tagclass&gt;org.apache.taglibs.response.SetContentTypeTag&lt;/tagclass&gt;
 * &lt;bodycontent&gt;JSP&lt;/bodycontent&gt;
 * &lt;info&gt;Sets the content type of the response being sent to the client.&lt;/info&gt;
 * </pre>
 *
 * @author Glenn Nielsen
 */

public class SetContentTypeTag extends BodyTagSupport
{

    /**
     * Method called at start of tag, just returns EVAL_BODY_TAG
     *
     * @return EVAL_BODY_TAG
     */
    public final int doStartTag() throws JspException
    {
	return EVAL_BODY_TAG;
    }

    /**
     * Read the body of the setContentType tag to obtain the content type.
     *
     * @return SKIP_BODY
     */
    public final int doAfterBody() throws JspException
    {
        // Use the body of the tag as content type
        BodyContent body = getBodyContent();
        String s = body.getString().trim();
        // Clear the body since we only used it as input for the
        // content type
        body.clearBody();

	pageContext.getResponse().setContentType(s);
        return SKIP_BODY;
    }

}