JAVA文件操作之远程采集文件

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;

/**
* 网络文件存取类
*
* @author GamVan by 我容易么我
*/
public class ReadFile {
    public ReadFile() {
    }

    /** 如果远程文件读取失败用此文件替代 */
    public String readerr = "";

    /** 收集运行哪个结果或错误信息 */
    public String message = "";

    /**
     * 根据文件url地址采集并创建到本地
     *
     * @param fileUrl
     *            文件url路径
     * @param filePathAndName
     *            预创建到本地的文件的绝对路径含文件名已经扩展名
     * @return
     * @throws IOException
     *             2006-1-17 4:48:06 made in GamVan
     */
    public boolean createFile(String fileUrl, String filePathAndName)
            throws IOException {
        boolean bea = false;
        java.net.URL urlfile = null;
        HttpURLConnection httpUrl = null;
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        File f = new File(filePathAndName);
        try {
            // 连接指定的网络资源,获取网络输入流
            urlfile = new java.net.URL(fileUrl);
            httpUrl = (HttpURLConnection) urlfile.openConnection();
            httpUrl.connect();
            bis = new BufferedInputStream(httpUrl.getInputStream());
        } catch (Exception e) {
            if (readerr != null && !readerr.equals("")) {
                try {
                    urlfile = new java.net.URL(readerr);
                    httpUrl = (HttpURLConnection) urlfile.openConnection();
                    httpUrl.connect();
                    bis = new BufferedInputStream(httpUrl.getInputStream());
                } catch (Exception e1) {
                    message = e1.toString();
                }
            }
            message = e.toString();
        }
        try {
            bos = new BufferedOutputStream(new FileOutputStream(f));
            ;
            byte[] b = new byte[1024];
            while (bis.read(b) != -1) {
                bos.write(b);
            }
            bea = true;

            message = fileUrl + " 采集成功！文件已存储至：" + filePathAndName;
        } catch (Exception e) {
            bea = false;
            message = e.toString();
        } finally {
            try {
                bos.flush();
                bis.close();
                httpUrl.disconnect();
            } catch (Exception e) {
                message = e.toString();
            }
        }
        return bea;
    }

    public void setReaderr(String readerr) {
        this.readerr = readerr;
    }

    public String getMessage() {
        return this.message;
    }

    /* test */
    public static void main(String args[]) {
        // 远程文件路径
        String s1 = "http://club.gamvan.com/club/GVimgs/mainLogo.gif";
        // 本地存放路径
        String s2 = "E:\\MYJAVA\\1.jpg";
        try {
            ReadFile fo = new ReadFile();

            fo.setReaderr("http://club.gamvan.com/club/GVimgs/mainLogo.gif");
            fo.createFile(s1, s2);
            System.out.println(fo.getMessage());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}