springboot实现文件批量下载(打包下载)

2024-6-5 23:30| 发布者: zhaojun917| 查看: 388| 评论: 0

摘要: 1.引入maven坐标dependency groupIdorg.apache.commons/groupId artifactIdcommons-compress/artifactId version1.21/version/dependencydependency groupIdorg.apache.tomcat.embed/groupId artifactIdtomcat-embed ...

1.引入maven坐标

<groupId>org.apache.commons</groupId>

<artifactId>commons-compress</artifactId>

</dependency>

<groupId>org.apache.tomcat.embed</groupId>

<artifactId>tomcat-embed-core</artifactId>

</dependency>

2. 编写工具类

package com.ruoyi.common.utils.file;

import com.ruoyi.common.vo.BatchDownloadFileVo;

import org.apache.tomcat.util.http.fileupload.IOUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Component;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletResponse;

import java.io.*;

import java.util.List;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

/**

* 文件批量下载(将多选的文件打成zip压缩包)

*

* @author colin

*/

@Component

public class CommonsCompressUtil {

private static final Logger log = LoggerFactory.getLogger(CommonsCompressUtil.class);

public static void batchDownload(HttpServletResponse response, List<BatchDownloadFileVo> paths, String targetFileName) throws Exception {

if (paths.size() > 0) {

// 创建临时路径,存放压缩文件

ServletOutputStream outputStream = response.getOutputStream();

response.setHeader("Content-Disposition", "attachment;filename=" + targetFileName);

ZipOutputStream zipOut = null;

// 压缩输出流,包装流,将临时文件输出流包装成压缩流,将所有文件输出到这里,打成zip包

try {

zipOut = new ZipOutputStream(outputStream);

// 循环调用压缩文件方法,将一个一个需要下载的文件打入压缩文件包

log.info("开始压缩!");

for (BatchDownloadFileVo batchDownloadFileVo : paths) {

// 该方法在下面定义

fileToZip(batchDownloadFileVo.getFilePath(), zipOut, batchDownloadFileVo.getChineseFileName());

}

log.info("压缩已完成!");

} finally {

// 压缩完成后,关闭压缩流

if (zipOut != null) {

zipOut.close();

}

outputStream.close();

}

public static void fileToZip(String filePath, ZipOutputStream zipOut, String chineseFileName) throws IOException {

FileInputStream fileInput = new FileInputStream(filePath);

// 缓冲

byte[] bufferArea = new byte[1024 * 10];

BufferedInputStream bufferStream = new BufferedInputStream(fileInput, 1024 * 10);

// 将当前文件作为一个zip实体写入压缩流,fileName代表压缩文件中的文件名称

zipOut.putNextEntry(new ZipEntry(chineseFileName));

int length = 0;

// 最常规IO操作,不必紧张

while ((length = bufferStream.read(bufferArea, 0, 1024 * 10)) != -1) {

zipOut.write(bufferArea, 0, length);

}

//关闭流

fileInput.close();

// 需要注意的是缓冲流必须要关闭流,否则输出无效

bufferStream.close();

// 压缩流不必关闭,使用完后再关

}

3. controller调用示例

4. vo对象

public class BatchDownloadFileVo {

private String chineseFileName;

private String filePath;

public String getChineseFileName() {

return chineseFileName;

}

public void setChineseFileName(String chineseFileName) {

this.chineseFileName = chineseFileName;

}

public String getFilePath() {

return filePath;

}

public void setFilePath(String filePath) {

this.filePath = filePath;

}

5. 前端调用示例（thymeleaf）

/**

* 批量下载

*/

function batchDownloads() {

table.set();

var rows = $.common.isEmpty(table.options.uniqueId) ? $.table.selectFirstColumns() : $.table.selectColumns(table.options.uniqueId);

if (rows.length === 0) {

$.modal.alertWarning("请至少选择一条记录");

return;

}

if (rows.length >= 10) {

$.modal.alertWarning("最多选择10条记录");

return;

}

var url = prefix1 + rows.join();

window.open(url)

}

6.结束

一次简单的记录！

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