java 文件流的处理 文件打包成zip
1、下载文件到本地
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public void download(HttpServletResponse response){
String filePath ="";//文件路径
String fileName ="";//文件名称
// 读到流中
InputStream inStream = new FileInputStream(filePath);
// 设置输出的格式
response.reset();
response.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
IOUtils.copy(inStream, response.getOutputStream());
}
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2、java后端下载
方式一：
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new URL(fileUrl + item.getcBhFileserver()).openStream()
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方法二：
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public Boolean addFile(String url, String id, String fileName) {
RequestCallback requestCallBack = new RequestCallback() {
@Override
public void doWithRequest(ClientHttpRequest request) throws IOException {
request.getHeaders().add("accept", MediaType.APPLICATION_OCTET_STREAM_VALUE);
}
};
ResponseExtractor<Boolean> responseExtractor = new ResponseExtractor<Boolean>() {
@Override
public Boolean extractData(ClientHttpResponse response) throws IOException {
if (response.getStatusCode() == HttpStatus.OK) {
//得到文件流
InputStream input = response.getBody();
return true;
}
return false;
}
};
return restTemplate.execute(url, HttpMethod.GET, requestCallBack, responseExtractor, id);
}
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3、文件打包成zip
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public void zipFilesAll() throws Exception {
String zipPath = "";//zip包路径
String zipFileName = "";//zip包名称
File zipFile = new File(zipFileName .toString());
// 创建 FileOutputStream 对象
FileOutputStream fileOutputStream = null;
// 创建 ZipOutputStream
ZipOutputStream zipOutputStream = null;
try {
//创建文件夹
zipFile = new File(zipPath );
FileUtils.forceMkdir(zipFile);
//创建文件
zipFile = new File(zipFileName .toString());
if (!zipFile.exists()) {
zipFile.createNewFile();
}
// 实例化 FileOutputStream 对象
fileOutputStream = new FileOutputStream(zipFileName.toString());
// 实例化 ZipOutputStream 对象
zipOutputStream = new ZipOutputStream(fileOutputStream);
// 创建 ZipEntry 对象
ZipEntry zipEntry = null;
for (CL cl: ClList) {
// 实例化 ZipEntry 对象，源文件数组中的当前文件
zipEntry = new ZipEntry(tCltjjl.getcClmc() + ".zip");
zipOutputStream.putNextEntry(zipEntry);
IOUtils.copy(new FileInputStream(cl.getcPath(), zipOutputStream);
}
} catch (Exception e) {
}finally{
//记得删除文件
}
}
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后台多文件打包成zip返回流 前台提供按钮一键下载
项目pom文件添加二维码操作，和文件打包的maven支持：
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<!--二维码相关 start-->
<dependency>
<groupId>net.glxn.qrgen</groupId>
<artifactId>javase</artifactId>
<version>2.0</version>
</dependency>
<!--二维码相关 end-->
<!--文件打包相关 start-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-compress</artifactId>
<version>1.12</version>
</dependency>
<!--文件打包相关 end-->
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前台代码：
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<button type="button" onclick="downloadzip()">下载</button>
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js（我用了thymeleaf模板）代码：
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<script th:inline="javascript">
function downloadzip(){
var storeType = $("#storeType").val();
if(storeType ==""){
bootAlertError("请选择门店！");
return;
}
var url = [[@{/downLoadProductQrCode/getStreamZip}]];
//模拟form表单 返回打包流
var form = $('<form method= "POST" action="'+ url +'" enctyped="multipart/form-data">'+
'<input name= "agencyId" type= "hidden" value="'+storeType+'" />'
+'</form>');
form. appendTo('body'). submit(). remove();
}
</script>
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后台代码：
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/**
* @Author Ni Klaus
* @Description //TODO 门店总代生成打包产品二维码zip
* @Date 上午 10:38 2019/8/20 0020
* @Param [params,response]
* @return void
**/
@RequestMapping({"getStreamZip"})
@ResponseBody
public void findList(@RequestParam Map params,HttpServletResponse response) throws Exception {
String agencyId = (String) params.get("agencyId");
AgencyAccount agencyAccount = agencyAccountService.getAccountByAgencyId(agencyId);
//这里设置打包后的zip文件名
String downloadName = agencyAccount.getName()+".zip";
try{
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition", "attachment;fileName=" + new String(downloadName.getBytes(),"ISO8859-1"));
}catch(UnsupportedEncodingException e){
log.error("----------下载文件名编码时出现错误------"+e.getMessage());
}
OutputStream outputStream = response.getOutputStream();
ZipArchiveOutputStream zous = new ZipArchiveOutputStream(outputStream);
zous.setUseZip64(Zip64Mode.AsNeeded);
zous.setEncoding("utf-8");
try{
//我这里是通过不同产品类型生成不同产品的二维码图片流
//具体你想生成什么类型的多个文件打包，只需要循环创建ArchiveEntry 然后zous.putArchiveEntry(entry)就可以了
StoreProductType[] storeProductTypes = StoreProductType.values();
for (StoreProductType storeProductType : storeProductTypes) {
String url = "http://m.xxx.cn/goods/pay/xxx.html?productid="+storeProductType.getProductId()
+ "&agencycode="+ agencyId +"&channelid=def&appfrom=sqjk&isstore=1";
//打包文件里的每个文件的名字
String imgName = storeProductType.getDescription()+".png";
ByteArrayOutputStream out = QRCode.from(url).to(ImageType.PNG).withSize(300,300).stream();
byte[] bytes = out.toByteArray();
ArchiveEntry entry = new ZipArchiveEntry(imgName);
zous.putArchiveEntry(entry);
zous.write(bytes);
zous.closeArchiveEntry();
if (out != null) {
out.close();
}
}
}catch (Exception e){
e.printStackTrace();
log.error("---------------门店总代生成二维码打包流出错----------------"+e.getMessage());
}finally{
if(outputStream != null){
outputStream.close();
}
if(zous != null){
zous.close();
}
}
}
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最后效果:
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/jiehanshi/p/11533465.html