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新建项目：springboot-file，打开pom.xml文件加入相关依赖
<dependencies>
<!--web-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--thymeleaf模板引擎-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>配置application.properties，内容如下：
#单个数据的大小
spring.servlet.multipart.max-file-size = 100Mb
#总数据的大小
spring.servlet.multipart.max-request-size=100Mb注：如果不配置单个数据大小，springboot默认的上传文件的大小为1MB，大于这个值就会报错。
编写文件配置类：FileConfig.java
public class FileConfig {
//对应的上传目录
public static final String UPLOAD_PATH = "D:/img/";
//允许上传的图片格式
public static final String[] UPLOAD_IMAGE_TYPES = {"jpg","ico","gif","png"};
//允许上传的文件格式
public static final String[] UPLOAD_FILE_TYPES ={"doc","docx","xls","xlsx","txt"};
//保存文件
public static final long FILE_MAX_SIZE = 3L * 1024 * 1024;
}编写控制器：FileController.java
@Controller
public class FileController {
@GetMapping("/index")
public String index() {
return "index";
}
/**
* 单文件上传
* @param file
* @return
*/
@PostMapping("/upload")
@ResponseBody
public String fileUpload(@RequestParam("fileName") MultipartFile file) {
//判断文件是否为空
if (file.isEmpty()) {
return "空文件";
}
if (file.getSize() > FileConfig.FILE_MAX_SIZE) {
return "文件超过指定大小";
}
//获取文件名
String fileName = file.getOriginalFilename();
//获取文件后缀
String type =fileName.indexOf(".") != -1 ? fileName.split("[.]")[1] : null;
//文件格式判断
if (!Arrays.asList(FileConfig.UPLOAD_IMAGE_TYPES).contains(type.toLowerCase())
&& !Arrays.asList(FileConfig.UPLOAD_FILE_TYPES).contains(type.toLowerCase())) {
return "图片类型不对";
}
//加入当前时间重命名文件，尽量避免文件名称重复
String path = FileConfig.UPLOAD_PATH + new SimpleDateFormat("yyyyMMddHHmmss").
format(new Date()) + "_" + fileName;
File file1 = new File(path);
//判断文件是否已经存在
if (file1.exists()) {
return "文件已存在";
}
//判断文件父目录是否存在
if (!file1.getParentFile().exists()) {
file1.getParentFile().mkdir();
}
try {
//保存文件
file.transferTo(file1);
} catch (IOException e) {
return "上传文件失败";
}
return path;
}
/**
* 多文件上传
* @param request
* @return
*/
@PostMapping("/uploads")
@ResponseBody
public Map<String, String> fileUploads(HttpServletRequest request){
Map<String,String> map=new HashMap<String,String>();
//fileNames为页面的文件控件的name
List<MultipartFile> files =((MultipartHttpServletRequest)request).getFiles("fileNames");
for (MultipartFile file:files) {
//获取文件名
String fileName = file.getOriginalFilename();
if (!file.isEmpty()) {
if (file.getSize() > FileConfig.FILE_MAX_SIZE) {
map.put(fileName,"文件超过指定大小");
continue;
}
//获取文件后缀
String type =fileName.indexOf(".") != -1 ? fileName.split("[.]")[1] : null;
//文件格式判断
if (!Arrays.asList(FileConfig.UPLOAD_IMAGE_TYPES).contains(type.toLowerCase())
&& !Arrays.asList(FileConfig.UPLOAD_FILE_TYPES).contains(type.toLowerCase())) {
map.put(fileName,"图片类型不对");
continue;
}
//加入当前时间重命名文件，尽量避免文件名称重复
String path = FileConfig.UPLOAD_PATH + new SimpleDateFormat("yyyyMMddHHmmss").
format(new Date()) + "_" + fileName;
File file1 = new File(path);
//判断文件是否已经存在
if (file1.exists()) {
map.put(fileName,"文件已存在");
continue;
}
//判断文件父目录是否存在
if (!file1.getParentFile().exists()) {
file1.getParentFile().mkdir();
}
try {
//保存文件
file.transferTo(file1);
} catch (IOException e) {
map.put(fileName,"上传文件失败");
}
} else {
map.put(fileName,"空文件");
}
}
return map;
}
/**
* 文件下载
* @param request
* @param response
* @return
*/
@GetMapping("/download")
@ResponseBody
public String downloadFile(HttpServletRequest request, HttpServletResponse response) {
// 生成的文件名
String fileName = "a.jpg";
if (fileName != null) {
//设置文件路径
File file = new File(FileConfig.UPLOAD_PATH+fileName);
//File file = new File(realPath , fileName);
if (file.exists()) {
// 设置强制下载不打开
response.setContentType("application/force-download");
// 设置文件名
response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);
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 (IOException e) {
e.printStackTrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
return "下载失败";
}
}在/resouces/templates/下编写页面文件：index.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>$Title$</title>
</head>
<body>
<p>-----------------------------------单文件上传-----------------------------------</p>
<form action="upload" method="post" enctype="multipart/form-data">
<p>选择文件: <input type="file" name="fileName"/></p>
<p><input type="submit" value="提交"/></p>
</form>
<p>-----------------------------------多文件上传-----------------------------------</p>
<form action="uploads" method="post" enctype="multipart/form-data">
<p>选择文件1: <input type="file" name="fileNames"/></p>
<p>选择文件2: <input type="file" name="fileNames"/></p>
<p><input type="submit" value="提交"/></p>
</form>
<p>-----------------------------------文件下载-----------------------------------</p>
<a href="/download">文件下载</a>
</body>
</html>**注：**1.html文件中要使用thymeleaf语法，得加入<html xmlns:th="http://www.thymeleaf.org">
2. thymeleaf默认得模板配置文件位置在/resouces/templates/下，所以我们使用默认得，application.properties配置文件中就不用管啦
3. 多文件上传中我返回一个map，如果map中有键值对数据，键代表文件名称，值代表提示的信息。
测试访问：ip:端口/index，文件上传下载到此结束！
最后，封装了一个文件工具类，用的上得可以瞅瞅哦！
public class FileUtils {
public static String fileToBase64(File file) {
String base64 = null;
InputStream in = null;
try {
in = new FileInputStream(file);
byte[] bytes = new byte[(int) file.length()];
in.read(bytes);
base64 = Base64.getEncoder().encodeToString(bytes);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return base64;
}
public static File base64ToFile(String base64) {
File file = null;
BufferedOutputStream bos = null;
FileOutputStream fos = null;
try {
byte[] bytes = Base64.getDecoder().decode(base64);
file = new File(formatDate() + "base64ToFile.png");
fos = new FileOutputStream(file);
bos = new BufferedOutputStream(fos);
bos.write(bytes);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bos != null) {
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return file;
}
//删除文件
public static boolean deleteFile(String fileName) {
File file = new File(fileName);
if (file.exists() && file.isFile()) {
file.delete();
return true;
}
return false;
}
//清空文件夹
public static boolean deleteDir(String path) {
File file = new File(path);
//判断是否待删除目录是否存在
if (!file.exists()) {
System.err.println("The dir are not exists!");
return false;
}
//取得当前目录下所有文件和文件夹
String[] content = file.list();
for (String name : content) {
File temp = new File(path, name);
//判断是否是目录
if (temp.isDirectory()) {
//递归调用，删除目录里的内容
deleteDir(temp.getAbsolutePath());
//删除空目录
temp.delete();
} else {
//直接删除文件
if (!temp.delete()) {
System.err.println("Failed to delete " + name);
}
}
}
return true;
}
public static String formatDate() {
return new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
}
public static void main(String[] args) {
// System.out.println(deleteFile("G:/test/test.txt"));
// File file = new File("D:/img/a.jpg");
// String fileToBase64 = fileToBase64(file);
// System.out.println(fileToBase64);
//
// File file1 = base64ToFile(fileToBase64);
// System.out.println(file1.getName());
}
}版权说明 : 本文为转载文章, 版权归原作者所有 版权申明
原文链接 : https://blog.csdn.net/xu12387/article/details/88692408
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