转自:
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
