springboot 实现文件下载

雨点打透心脏的1/2处 2023-02-18 14:10 17阅读 0赞

记录下java实现页面下载的代码，以便使用。  
实现效果如下图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L05ld19ZYW8_size_16_color_FFFFFF_t_70]

## 直接上代码： ##

*  页面部分

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<h2>下载测试</h2>
    	<a href="/download.do"><button>点击下载</button></a>
    </body>
    </html>

*  java部分

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 javax.servlet.http.HttpServletResponse;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    @Controller
    public class DownLoadController { 
    	@RequestMapping("/download.do")
    	@ResponseBody
    	public HttpServletResponse downLoad(HttpServletResponse response) { 
    		System.out.println("进入下载");
    		String path = "C:/Users/Administrator/Videos/20191206153339_469.mp4";
    		try { 
    			// path是指欲下载的文件的路径。
    			File file = new File(path);
    			// 取得文件名。
    			String filename = file.getName();
    			// 取得文件的后缀名。
    			String suffix = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
    
    			// 以流的形式下载文件。
    			InputStream fis = new BufferedInputStream(new FileInputStream(path));
    			byte[] buffer = new byte[fis.available()];
    			fis.read(buffer);
    			fis.close();
    			// 清空response
    			response.reset();
    			// 设置response的Header
    			response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
    			response.addHeader("Content-Length", "" + file.length());
    			OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
    			response.setContentType("application/octet-stream");
    			toClient.write(buffer);
    			toClient.flush();
    			toClient.close();
    		} catch (IOException ex) { 
    			ex.printStackTrace();
    		}
    		return response;
    	}
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L05ld19ZYW8_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200618100519991.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L05ld19ZYW8=,size_16,color_FFFFFF,t_70