springBoot文件上传下载
- springboot项目，前台页面使用的thymeleaf模板
- 前台页面resource下 templates/fileView.html，其中包含单个上传，下载，批量上传。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<p>单文件上传</p>
<!--action 依据自建项目路径调整-->
<form action="file/upload" method="POST" enctype="multipart/form-data">
文件：<input type="file" name="file"/>
<input type="submit" value="提交"/>
</form>
<hr/>
<p>文件下载</p>
<a href="file/download">下载文件</a>
<hr/>
<p>多文件上传</p>
<form method="POST" enctype="multipart/form-data" action="file/batch">
<p>文件1：<input type="file" name="file"/></p>
<p>文件2：<input type="file" name="file"/></p>
<p><input type="submit" value="上传"/></p>
</form>
</body>
</html>
- ToFileViewController 用来跳转页面
@Controller
public class ToFileViewController {
@RequestMapping("/fileView")
public String index()
{
return "fileView";
}
}
- 本文的重点，FileController，其中包含单个上传，单个下载，批量上传对应的方法。需要注意下载功能写的是对应我电脑里面固定位置的文件，仅供大家来参考。以下是代码
/**
* @Description 包含单个上传，单个下载，批量上传对应的方法。注意下载功能写的是对应我电脑里面固定位置的文件，仅供参考学习
* @Author
* @Version V1.0.0
* @Since 1.0
* @Date 2019-09-26
*/
@Api(value = "file", description = "文件处理案例")
@RestController
@RequestMapping("/file")
@Slf4j
@Validated
public class FileController {
//单个上传
@PostMapping("/upload")
public String upload(@RequestParam("file") MultipartFile file) {
try {
if(file.isEmpty()){
return "文件为空";
}
//获取文件名
String fileName = file.getOriginalFilename();
log.info("上传的文件名为：" + fileName);
//获取文件的后缀名
String suffixName = fileName.substring(fileName.lastIndexOf("."));
log.info("文件的后缀名为：" + suffixName);
//设置文件的存储路径
String filePath = "E:/kaifa/ieda/idea_workspace/logs";
//拼接完整的文件路径
String path = filePath +"/"+fileName;
//构造文件对象
File dest = new File(path); //
//检测是否存在目录（不存在新疆文件，存在直接写入文件）
if(!dest.getParentFile().exists()){
dest.getParentFile().mkdirs(); //新建文件夹
}
//文件写入
file.transferTo(dest);
return "上传成功";
} catch (IOException e) {
e.printStackTrace();
}
return "上传失败";
}
@PostMapping("/batch")
public String handleFileUpload(HttpServletRequest request){
List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
MultipartFile file = null;
BufferedOutputStream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
String filePath = "E:/kaifa/ieda/idea_workspace/logs";
if (!file.isEmpty()) {
try {
byte[] bytes = file.getBytes();
stream = new BufferedOutputStream(
new FileOutputStream(
new File(filePath + "/" + file.getOriginalFilename())));//设置文件路径及名字
stream.write(bytes);
stream.close();
} catch (Exception e) {
stream = null;
return "第 " + i + " 个文件上传失败 ==> "
+ e.getMessage();
}
} else {
return "第 " + i
+ " 个文件上传失败因为文件为空";
}
}
return "上传成功";
}
@GetMapping("download")
public String downloadFile(HttpServletRequest request, HttpServletResponse response){
String fileName = "llfc.jpg"; // 测试文件名
String realPath = "E:/kaifa/ieda/idea_workspace/logs";
if(fileName != null){
//设置文件路径
File file = new File(realPath,fileName);
if(file.exists()){
response.setContentType("application/force-download");// 设置强制下载不打开
response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名
byte[] buffer = new byte[1024];
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
OutputStream os = response.getOutputStream();
int i = bis.read(buffer);
while(i != -1){
os.write(buffer,0,i);
i = bis.read(buffer);
}
return "下载成功";
} catch (Exception e) {
e.printStackTrace();
} finally{
if(bis != null){
try {
bis.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if(fis != null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
return "下载失败";
}
}
转载：https://blog.csdn.net/weixin_43854141/article/details/101627895
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