springboot 下载文件, 通过IO流的方式

一 springboot 接口

    /**下载模版
     * @param response
     * @throws Exception
     */
    @RequestMapping(value="/downExcel")
    public void downExcel(HttpServletResponse response)throws Exception{
        FileDownload.fileDownload(response, PathUtil.getProjectpath() + Const.FILEPATHFILE + "Users.xls", "Users.xls");
    }

 

二 工具类

package org.fh.util;

import java.io.BufferedOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletResponse;

/**
 * 说明：下载文件
 * 作者：FH
 * 官网：www.fhadmin.org
 */
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.toByteArray2(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();
	    response.flushBuffer();
	} 

}