includetag.java

来自「jakarta-taglibs」· Java 代码 · 共 84 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.utility.basic;

import java.net.URL;
import java.net.HttpURLConnection;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

/**
  * This tag will put the contents of
  * the specified url.
  *
  * Author Mandar Raje.
  */

public class IncludeTag extends BodyTagSupport {

    private String url;

    public String getUrl() {
	return url;
    }

    public void setUrl(String val) {
	this.url = val;
    }

    public int doStartTag() {
	return EVAL_BODY_TAG;
    }

    public int doEndTag() throws JspException {
	try {
	    getDataFromURL(bodyContent);
	    bodyContent.writeOut(bodyContent.getEnclosingWriter());
	} catch (Exception ex) {
	    throw new JspException(ex.getMessage());
	}
	return SKIP_BODY;
    }

    public void getDataFromURL(BodyContent bodyContent) throws JspException {
	try {
	    
	    if(getUrl() == null)
		throw new JspException("URL incorrectly specified");
	    
	    URL includeURL = new URL(getUrl());
	    HttpURLConnection connection = (HttpURLConnection) includeURL.openConnection();
	    connection.connect();
	    
	    BufferedReader in = new BufferedReader(new InputStreamReader
						   (connection.getInputStream()));
            String line = null;
            while ((line = in.readLine()) != null ) {
		bodyContent.write(line);
	    }
	    
	} catch (Exception ex) {
	    throw new JspException(ex.getMessage());
	}
    }
}