Java 实现下载文件工具类

package com.liunian.utils;import lombok.SneakyThrows;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;/*** @ClassName DownloadFileUtils* @Author liuyan 下载文件工具类* @Description* @Date 2023/8/4 0004 11:06* @Version 1.0*/
public class DownloadFileUtils {/*** 下载文件** @param filePath 文件路径* @param response 响应体*/@SneakyThrowspublic static void downloadFile(String filePath, HttpServletResponse response) {File file = new File(filePath);//输入流，读取文件内容FileInputStream fileInputStream = new FileInputStream(file.getPath());//输出流，将文件写回浏览器ServletOutputStream servletOutputStream = response.getOutputStream();//响应格式（图片）response.addHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes()));response.addHeader("Content-Length", String.valueOf(file.length()));response.setContentType("application/octet-stream");int len = 0;byte[] bytes = new byte[1024];while ((len = fileInputStream.read(bytes)) != -1) {servletOutputStream.write(bytes, 0, len);servletOutputStream.flush();}fileInputStream.close();servletOutputStream.close();}
}