浏览器,下载指定路径的文件

通过浏览器下载指定路径的Execl文件

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

 @Override
    public ResultData down(Integer id, HttpServletResponse response) {
        DownExeclTask downExeclTask = downExeclMapper.getById(id);
        if(downExeclTask == null){
            ResultData.fail("导出任务不存在");
        }
        String url = downExeclTask.getUrl();
        String fileName= downExeclTask.getFileName();
        try {
            response.reset();// 清空输出流
            fileName= new String( fileName.getBytes( "gb2312" ), "ISO8859-1");
            response.setHeader("Content-disposition", "attachment; filename=" + fileName);// 设定输出文件头
            response.setContentType("application/msexcel");// 定义输出类型
            File file = new File(url);
            FileInputStream in = new FileInputStream(file);
            ServletOutputStream out = response.getOutputStream();
            int b;
            while ((b = in.read()) != -1){
                out.write(b);
            }
            in.close();
            out.close();
            out.flush();
        } catch (IOException e) {
            logger.error("异常信息{}", e);
        }
        return ResultData.ok();
    }