download Http URL and get file name - Java Network

Java examples for Network:URL Download

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Description

download Http URL and get file name

Demo Code

/**/*from w ww  . ja  v  a2 s . c  o  m*/
 *  Copyright 2009, 2011 Welocalize, Inc. 
 *  
 *  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 com.java2s;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLDecoder;

public class Main {


    public static File downloadHttp(String downloadURL, String basePath,
            String commonPathURL) throws Exception {
        String urlDecode = URLDecoder.decode(downloadURL, "UTF-8")
                .replaceAll("\\\\", "/");
        urlDecode = urlDecode.replace(" ", "%20");

        URL url = new URL(urlDecode);
        HttpURLConnection hurl = (HttpURLConnection) url.openConnection();
        hurl.connect();
        InputStream is = hurl.getInputStream();

        String realPath = URLDecoder.decode(commonPathURL, "UTF-8")
                .replaceAll("\\\\", "/").replace(" ", "%20");
        realPath = realPath.replace("%20", " ");

        String fullPath = getFileName(realPath, basePath);
        File file = new File(fullPath);
        saveFile(is, file);

        return file;
    }

    private static String getFileName(String url, String basePath)
            throws Exception {
        String[] url1 = url.split("cxedocs");
        String after = url1[1];
        String before = basePath;
        if (before == null) {
            before = new File(".").getAbsolutePath();
        }
        String fileName = before + after;
        return fileName;
    }

    private static void saveFile(InputStream is, File file)
            throws IOException, FileNotFoundException {
        file.getParentFile().mkdirs();
        file.createNewFile();
        FileOutputStream outstream = new FileOutputStream(file);
        int c;
        while ((c = is.read()) != -1) {
            outstream.write(c);
        }
        outstream.close();
        is.close();
        if (file.length() == 0) {
            file.delete();
        }
    }
}

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