springboot如何实现文件下载呢？

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springboot如何实现文件下载呢？

下文笔者讲述SpringBoot实现文件下载的方法分享，如下所示:

文件存储在服务器指定位置

import java.io.*;import java.net.URLEncoder;import java.util.*;import com.alibaba.excel.ExcelWriter;import com.alibaba.excel.metadata.Sheet;import com.alibaba.excel.support.ExcelTypeEnum;import org.springframework.Http.MediaType;import org.springframework.WEB.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.httpservletResponse;@RestControllerpublic class Controller {     @GetMapping(value = "/downloadFile", consumes = MediaType.ALL_VALUE)    void downloadFile(final HttpServletResponse response)            throws Exception {         // 获取文件        File file = new File("D:\java265.txt");        //文件名        String fileName = file.getName();         // 清空缓冲区，状态码和响应头(headers)        response.reset();        // 设置ContentType，响应内容为二进制数据流，编码为utf-8，此处设定的编码是文件内容的编码        response.setContentType("application/octet-stream;charset=utf-8");        // 以（Content-Disposition: attachment; filename="filename.jpg"）格式设定默认文件名，设定utf编码，此处的编码是文件名的编码，使能正确显示中文文件名        response.setHeader("Content-Disposition", "attachment;fileName="+ fileName +";filename*=utf-8''"+URLEncoder.encode(fileName,"utf-8"));         // 实现文件下载        byte[] buffer = new byte[1024];        FileInputStream fis = null;        BufferedInputStream bis = null;        try {            fis = new FileInputStream(file);            bis = new BufferedInputStream(fis);            // 获取字节流            OutputStream os = response.getOutputStream();            int i = bis.read(buffer);            while (i != -1) {                os.write(buffer, 0, i);                i = bis.read(buffer);            }            System.out.println("Download successfully!");        }        catch (Exception e) {            System.out.println("Download failed!");        }        finally {            if (bis != null) {                try {                    bis.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if (fis != null) {                try {                    fis.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}

创建文件数据并下载

import java.io.*;import java.net.URLEncoder;import java.util.*;import java.util.List; import com.alibaba.excel.EasyExcel;import com.alibaba.excel.ExcelWriter; import com.alibaba.excel.support.ExcelTypeEnum;import com.alibaba.excel.write.metadata.WriteSheet;import org.springframework.http.MediaType;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletResponse;@RestControllerpublic class Controller {     @GetMapping(value = "/downloadExcel", consumes = MediaType.ALL_VALUE)    void downloadExcel(final HttpServletResponse response)            throws Exception {        String name = "测试." + ExcelTypeEnum.XLSX;        // 清空缓冲区，状态码和响应头(headers)        response.reset();        // 设置ContentType，响应内容为文本数据，编码为utf-8，此处设定的编码是文件内容的编码        response.setContentType("text/plain;charset=utf-8");        // 以（Content-Disposition: attachment; filename="filename.jpg"）格式设定默认文件名，设定utf编码，此处的编码是文件名的编码，使能正确显示中文文件名        response.setHeader("Content-Disposition", "attachment;fileName=" + name + ";filename*=utf-8''" + URLEncoder.encode(name, "utf-8"));         // 响应输出流        OutputStream out = response.getOutputStream();        // 建立excel        ExcelWriter excelWriter = EasyExcel.write(out).build();        // 建立sheet        WriteSheet writeSheet = EasyExcel.writerSheet("sheet1").build();        // 指定sheet并写数据        excelWriter.write(getListString(), writeSheet);        // 不要忘记        excelWriter.finish();        out.flush();    }     // 生成excel内容    List> getListString() {        List> result = new LinkedList<>();        List data1 = new LinkedList<>();        data1.add("1");data1.add("maomao");data1.add("java265");        result.add(data1);        List data2 = new LinkedList<>();        data1.add("2");data1.add("maomao-2");data1.add("java265-3");        result.add(data2);        List data3 = new LinkedList<>();        data1.add("3");data1.add("maomao-3");data1.add("java265-4");        result.add(data3);        return result;    }}

来源地址：https://blog.csdn.net/qq_25073223/article/details/127917013