代码：

		// 设置响应头response.setCharacterEncoding("UTF-8");//设置响应的字符编码为UTF-8response.setContentType("application/octet-stream");//设置响应的内容类型为二进制流，通常用于文件下载。response.setHeader("Content-Disposition", "attachment; filename=test.zip");//设置响应头中的Content-Disposition字段，告诉浏览器将响应内容作为附件处理，并指定下载文件的名称为test.zip。//创建xml文件1Document document = DocumentHelper.createDocument();Element root = document.addElement("root");Element test = root.addElement("test");test.addAttribute("name","淫龙公子");test.addAttribute("age","38");test.addAttribute("jjMaxLength","6cm");Element test1 = root.addElement("test");test1.addAttribute("name","yi龙公子");test1.addAttribute("age","66");test1.addAttribute("jjMaxLength","7cm");Element test2 = root.addElement("test");test2.addAttribute("name","王有");test2.addAttribute("age","77");test2.addAttribute("jjMaxLength","1cm");//创建xml文件2Document document1 = DocumentHelper.createDocument();Element root1 = document1.addElement("root");Element test11 = root1.addElement("test");test11.addAttribute("name","淫龙公子");test11.addAttribute("age","38");test11.addAttribute("jjMaxLength","6cm");Element test12 = root1.addElement("test");test12.addAttribute("name","yi龙公子");test12.addAttribute("age","66");test12.addAttribute("jjMaxLength","7cm");Element test13 = root1.addElement("test");test13.addAttribute("name","王有");test13.addAttribute("age","77");test13.addAttribute("jjMaxLength","1cm");//创建xml文件3Document document2 = DocumentHelper.createDocument();Element root2 = document2.addElement("root");Element test21 = root2.addElement("test");test21.addAttribute("name","淫龙公子");test21.addAttribute("age","38");test21.addAttribute("jjMaxLength","6cm");Element test22 = root2.addElement("test");test22.addAttribute("name","yi龙公子");test22.addAttribute("age","66");test22.addAttribute("jjMaxLength","7cm");Element test23 = root2.addElement("test");test23.addAttribute("name","王有");test23.addAttribute("age","77");test23.addAttribute("jjMaxLength","1cm");// 将XML转成字符串，后面能用工具类将字符串转成流String asXML = document.asXML();String asXML1 = document1.asXML();String asXML2 = document2.asXML();ZipOutputStream out = null;try {out = new ZipOutputStream(response.getOutputStream());//writeToZip：将xml流写到zip输出流中writeToZip(out,asXML,"test1.xml");writeToZip(out,asXML1,"test2.xml");writeToZip(out,asXML2,"test3.xml");out.flush();out.close();} catch (Exception e) {e.printStackTrace();}finally {if (out != null){try {out.close();} catch (IOException e) {e.printStackTrace();}}}

writeToZip方法：

private void writeToZip(ZipOutputStream out,String xmlContent,String fileName) throws IOException {int len =0;byte[] buffer = new byte[1024];InputStream is = IOUtils.toInputStream(xmlContent, "utf-8");out.putNextEntry(new ZipEntry(fileName));while ((len = is.read(buffer)) >0){out.write(buffer,0,len);}out.closeEntry();is.close();}

注意：前后端分离项目中如果前端有响应拦截器，我们需要再做处理，例如vue项目的下载方法：

// 通用下载方法
export function download(url, params, filename, config) {downloadLoadingInstance = Loading.service({ text: "正在下载数据，请稍候", spinner: "el-icon-loading", background: "rgba(0, 0, 0, 0.7)", })return service.post(url, params, {transformRequest: [(params) => { return tansParams(params) }],headers: { 'Content-Type': 'application/x-www-form-urlencoded' },responseType: 'blob',...config}).then(async (data) => {const isBlob = blobValidate(data);if (isBlob) {const blob = new Blob([data])saveAs(blob, filename)} else {const resText = await data.text();const rspObj = JSON.parse(resText);const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode['default']Message.error(errMsg);}downloadLoadingInstance.close();}).catch((r) => {console.error(r)Message.error('下载文件出现错误，请联系管理员！')downloadLoadingInstance.close();})
}

附加（导出xml文件）：

//导出xml文件// 设置响应头response.setCharacterEncoding("UTF-8");response.setContentType("application/octet-stream");response.setHeader("Content-Disposition", "attachment; filename=test.xml");//创建xml文件Document document = DocumentHelper.createDocument();Element root = document.addElement("root");Element test = root.addElement("test");test.addAttribute("name","淫龙公子");test.addAttribute("age","38");test.addAttribute("jjMaxLength","6cm");Element test1 = root.addElement("test");test1.addAttribute("name","yi龙公子");test1.addAttribute("age","66");test1.addAttribute("jjMaxLength","7cm");Element test2 = root.addElement("test");test2.addAttribute("name","王有");test2.addAttribute("age","77");test2.addAttribute("jjMaxLength","1cm");try {OutputStream outputStream = response.getOutputStream();OutputFormat format = OutputFormat.createPrettyPrint();XMLWriter writer = new XMLWriter(outputStream, format);writer.write(document);writer.close();outputStream.flush();outputStream.close();} catch (FileNotFoundException | UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}

用到的jar包：

<!-- xml包 --><dependency><groupId>dom4j</groupId><artifactId>dom4j</artifactId><version>1.1</version></dependency>