httptag.java

来自「jakarta-taglibs」· Java 代码 · 共 80 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.io;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import javax.servlet.ServletContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.TagSupport;

/** A JSP Custom tag to make a HTTP request and output the response.
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @version $Revision: 1.2 $
  */
public class HttpTag extends URLTag {

    /** HTTP request method */
    private String action = "GET";
    
    public HttpTag() {
    }
    
    // Tag interface
    //-------------------------------------------------------------------------                        
    public void release() {
        super.release();
        action = null;
    }
    
    
    // Properties
    //-------------------------------------------------------------------------                    
    public void setAction(String action) {
        this.action = action;
        setInput( isInputAction( action ) );
    }

    // Implementation methods
    //-------------------------------------------------------------------------                    
    protected void configureConnection( HttpURLConnection connection ) throws IOException {
        super.configureConnection(connection);
        
        HttpURLConnection httpConnection = (HttpURLConnection) connection;
        connection.setRequestMethod( action );
    }

    /** @return true if the given HTTP action should result in some 
      * information being sent as part of the request, such as the POST action
      */
    protected boolean isInputAction(String action) {
        return "POST".equalsIgnoreCase( action ) || "PUT".equalsIgnoreCase( action );
    }
}