Java 模拟浏览器下载代码,Java代码库,德仔网

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【Java】 Java 模拟浏览器下载
作者: / 发布于2017/9/11/ 461
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class FileUtil {

    private static final Log LOGGER = LogFactory.getLog(FileUtil.class);
    public static final String SEPARATOR = System.getProperties().getProperty("file.separator");
    private FileUtil() {
    }

    public static void download(HttpServletRequest request,HttpServletResponse response,
            String filePath) throws IOException{
        
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        OutputStream fos = null;
        InputStream fis = null;
        File downFiles = new File(filePath);
        if(!downFiles.exists() || !downFiles.isFile()){
            return;
        }
        try {
            String fileName = filePath.substring(filePath.lastIndexOf(SEPARATOR) + 1);
            fis = new FileInputStream(downFiles);
            bis = new BufferedInputStream(fis);
            fos = response.getOutputStream();
            bos = new BufferedOutputStream(fos);
            FileUtil.setFileDownloadHeader(request,response, fileName);
            int byteRead = 0;
            byte[] buffer = new byte[ConstantsUtil.NUMBER_8192];
            while((byteRead=bis.read(buffer,0,ConstantsUtil.NUMBER_8192))!=-1){
                bos.write(buffer,0,byteRead);
            }
             
            bos.flush();
            fis.close();
            bis.close();
            fos.close();
            bos.close();
        } catch (Exception e) {
            LOGGER.info(e);
        }
     
    }
    
    /**
     * 设置让浏览器弹出下载对话框的Header.
     * 根据浏览器的不同设置不同的编码格式  防止中文乱码
     * @param fileName 下载后的文件名.
     */
    public static void setFileDownloadHeader(HttpServletRequest request,HttpServletResponse response,
            String fileName) {
        try {
            //中文文件名支持
            String encodedfileName = null;
            String agent = request.getHeader("USER-AGENT");
            if(null != agent && -1 != agent.indexOf("MSIE")){
                encodedfileName = java.net.URLEncoder.encode(fileName,ConstantsUtil.UTF8);
            }else if(null != agent && -1 != agent.indexOf("Mozilla")){
                encodedfileName = new String (fileName.getBytes(ConstantsUtil.UTF8),"iso-8859-1");
            }else{
                encodedfileName = java.net.URLEncoder.encode(fileName,ConstantsUtil.UTF8);
            }
            response.setHeader("Content-Disposition", "attachment; filename=\"" + encodedfileName + "\"");
        } catch (UnsupportedEncodingException e) {
            LOGGER.info(e);
        }
    }
}
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