java实现文件下载功能代码详解编程语言

  
import java.io.BufferedOutputStream; 
import java.io.OutputStream; 
import java.net.URLEncoder; 
  
import javax.servlet.http.HttpServletResponse; 
  
  
/** 
 *  java实现文件下载功能代码 
 *  创建时间：2014年12月23日 
 * @version 
 */ 
public class FileDownload { 
  
    /** 
     * @param response 
     * @param filePath      //文件完整路径(包括文件名和扩展名) 
     * @param fileName      //下载后看到的文件名 
     * @return  文件名 
     */ 
    public static void fileDownload(final HttpServletResponse response, String filePath, String fileName) throws Exception{  
               
            byte[] data = FileUtil.toByteArray3(filePath);  
            fileName = URLEncoder.encode(fileName, "UTF-8");  
            response.reset();  
            response.setHeader("Content-Disposition", "attachment; filename=/"" + fileName + "/"");  
            response.addHeader("Content-Length", "" + data.length);  
            response.setContentType("application/octet-stream;charset=UTF-8");  
            OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());  
            outputStream.write(data);  
            outputStream.flush();  
            outputStream.close();  
              
        } 
  
}