下载 

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;

@Controller
public class DownFile {
    @RequestMapping("/download")
    public void downFile(String fileName, HttpServletResponse res, HttpServletRequest req) throws IOException {
//        设置响应头
        res.setHeader("Content-Disposition","attachment;filename=bbb.txt");
//        获取流对象
        ServletOutputStream os = res.getOutputStream();
//        获取文件所在文件夹路径文件路径
        String path = req.getSession().getServletContext().getRealPath("files");
//        获取File对象，文件路径 和文件名
        File file = new File(path, fileName);
//        通过apache工具将文件转换为字节数据
        byte[] bytes = FileUtils.readFileToByteArray(file);
//        写出
        os.write(bytes);
        os.flush();
        os.close();
    }
}
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.19.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.kie.modules</groupId>
            <artifactId>org-apache-commons-fileupload</artifactId>
            <version>6.5.0.Final</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
    </dependencies>
@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<a href="download?fileName=a.txt">下载</a>
</body>
</html>

 

posted @ 2018-10-18 19:19  凤凰山小旋风  阅读(116)  评论(0)    收藏  举报