版权声明：[ws - 兮的博客] - 空间专属，未经声明不得私自转载 https://blog.csdn.net/qq_41463655/article/details/83987985
适用于springboot，ssm框架等
// ============文件删除===============
@RequestMapping(value = "/deleteFile", method = RequestMethod.GET)
@ResponseBody
public void deleteFile(Long fileId) {
File fileVal = fileService.selectId(fileId);
fileService.deleteId(fileId); //删除数据库
java.io.File file = new java.io.File(fileVal.getUrl());
boolean exis = file.exists(); // 判断目录或文件是否存在
boolean isex = file.isFile(); // 判断是否为文件
file.delete(); //删除文件
}
上传文件方法，适用于多，单文件上传
// ============controller方法===============
@RequestMapping(value = "/fileUpdateImg", method = RequestMethod.POST)
@ResponseBody
public String handleFileUpload1(HttpServletRequest request) throws IOException {
List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file"); //接收到的文件
String filePath = "file/img/"; //上传路径
List<Map<String, String>> list = utlisFile.handleFileUpload(files, filePath); //文件上传
return "yes";
}
// ============工具类( utlisFile ) 方法===============
/* *
* @Description //TODO 文件上传
* @Date 2018/10/8/008/
* @Param [files, filepath]
* @return java.util.List<java.util.Map<java.lang.String,java.lang.String>>
**/
public static List<Map<String, String>> handleFileUpload(List<MultipartFile> files, String filepath) throws IOException {
List<Map<String, String>> listfile = new ArrayList();
MultipartFile file = null;
BufferedOutputStream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
if (!file.isEmpty()) {
try {
//上传路径
String uploadFilePath = file.getOriginalFilename();
String uploadFileName = uploadFilePath.substring(uploadFilePath.lastIndexOf('\\') + 1,uploadFilePath.indexOf('.'));
String uploadFileSuffix = uploadFilePath.substring(uploadFilePath.indexOf('.') + 1, uploadFilePath.length());
//获取跟目录
File path = new File(ResourceUtils.getURL("classpath:").getPath());
if (!path.exists()) path = new File("");
File upload = new File(path.getAbsolutePath(), filepath);
if (!upload.exists()) upload.mkdirs();
System.out.println(upload);
String datess = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
String pathfile = upload + "\\" + uploadFileName + datess + "." + uploadFileSuffix;
System.out.println(pathfile);
stream = new BufferedOutputStream(new FileOutputStream(new File(pathfile)));
stream = new BufferedOutputStream(new FileOutputStream(new File(pathfile)));
byte[] bytes = file.getBytes();
stream.write(bytes, 0, bytes.length);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (stream != null) {
stream.close();
}
}
}
}
return listfile;
}
文件下载，自行传文件路径，工具类 utlisFile 方法
/**
* @return
* @Description //TODO 文件下载
* @Date 2018/10/8/008/
* @Param
**/
public static void excelxiazan(HttpServletResponse res, String fileName) throws
UnsupportedEncodingException {
//要下载的文件路径（前台传id）
//String fileName = excelService.selectbyId(eid);
//文件命名(获得完整路径最后的 \\ 后的内容)
int fileXs = fileName.lastIndexOf("\\");
//下载文件名，去掉时时间戳
String fileXsl = fileName.substring(fileXs + 1, fileName.length() - 18);
//String fileXsl = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
//信息头: 会告诉浏览器这个文件的名字和类型（必须设置）
res.setHeader("content-type", "application/octet-stream");
res.setContentType("application/octet-stream");
//Content-Disposition : 指定的类型是文件的扩展名(也就是下载文件的名字)
//下载名乱码解决 --> java.net.URLEncoder.encode(fileXsl, "UTF-8")
res.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileXsl + ".xls", "UTF-8"));
byte[] buff = new byte[1024];
BufferedInputStream bis = null;
OutputStream os = null;
try {
os = res.getOutputStream();
bis = new BufferedInputStream(new FileInputStream(new File(fileName)));
int i = bis.read(buff);
while (i != -1) {
os.write(buff, 0, buff.length);
os.flush();
i = bis.read(buff);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
多文件压缩下载
//========================== TODO （方法）多文件下载ZIP包 ========================
/* *
* 需要 filePaths 下载路径集
* zipNamex 压缩包名+ .zip
* res HttpServletResponse
**/
public void exceDownload(List<String> filePaths, HttpServletResponse res, String zipNamex) throws
IOException {
String zipName = zipNamex; //压缩包名字
res.setContentType("text/html; charset=UTF-8"); //设置编码字符
res.setContentType("application/octet-stream"); //设置内容类型为下载类型
OutputStream out = res.getOutputStream(); //创建页面返回方式为输出流，会自动弹出下载框
File path = new File(ResourceUtils.getURL("classpath:").getPath()); //项目跟目录
if (!path.exists()) path = new File("");
File upload = new File(path.getAbsolutePath(), "static/images/uploaZip"); //压缩包根目录
if (!upload.exists()) upload.mkdirs();
String zipFilePath = upload + File.separator + zipName; //拼接目录
//创建zip文件输出流 == 压缩文件========================================================
File zip = new File(zipFilePath);
if (!zip.exists()) {
zip.createNewFile();
}
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zip));
//打压缩包
this.zipFile(String.valueOf(upload), zipName, zipFilePath, filePaths, zos);
zos.close(); //设置下载的压缩文件名称
res.setHeader("Content-disposition", "attachment;filename=" + java.net.URLEncoder.encode(zipName, "UTF-8"));
//创建zip文件输出流==========================================================
//将打包后的文件写到客户端，输出的方法同上，使用缓冲流输出
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(zipFilePath));
byte[] buff = new byte[bis.available()];
bis.read(buff);
bis.close();
out.write(buff);//输出数据文件
out.flush();//释放缓存
out.close();//关闭输出流
}
/**
* //TODO 压缩文件
*
* @param zipBasePath 临时压缩文件基础路径
* @param zipName 临时压缩文件名称
* @param zipFilePath 临时压缩文件完整路径
* @param filePaths 需要压缩的文件路径集合
* @throws IOException
*/
public static String zipFile(String zipBasePath, String zipName, String
zipFilePath, List<String> filePaths, ZipOutputStream zos) throws IOException {
//循环读取文件路径集合，获取每一个文件的路径
for (String filePath : filePaths) {
File inputFile = new File(filePath); //根据文件路径创建文件
if (inputFile.exists()) { //判断文件是否存在
if (inputFile.isFile()) { //判断是否属于文件，还是文件夹
//创建输入流读取文件
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(inputFile));
//将文件写入zip内，即将文件进行打包
zos.putNextEntry(new ZipEntry(inputFile.getName()));
//写入文件的方法，同上
int size = 0;
byte[] buffer = new byte[1024]; //设置读取数据缓存大小
while ((size = bis.read(buffer)) > 0) {
zos.write(buffer, 0, size);
}
//关闭输入输出流
zos.closeEntry();
bis.close();
} else { //如果是文件夹，则使用穷举的方法获取文件，写入zip
try {
File[] files = inputFile.listFiles();
List<String> filePathsTem = new ArrayList<String>();
for (File fileTem : files) {
filePathsTem.add(fileTem.toString());
}
return zipFile(zipBasePath, zipName, zipFilePath, filePathsTem, zos);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return null;
}
单文件上传
/*========================== 单文件上传 =============================== */
@ResponseBody
@RequestMapping(value = "/testUploadFile", method = RequestMethod.POST)
public String testUploadFile(HttpServletRequest req,
MultipartHttpServletRequest multiReq) {
// 获取上传文件的路径
String uploadFilePath = multiReq.getFile("file").getOriginalFilename();
System.out.println("uploadFlePath:" + uploadFilePath);
// 截取上传文件的文件名
String uploadFileName = uploadFilePath.substring(
uploadFilePath.lastIndexOf('\\') + 1, uploadFilePath.indexOf('.'));
System.out.println("multiReq.getFile()" + uploadFileName);
// 截取上传文件的后缀
String uploadFileSuffix = uploadFilePath.substring(
uploadFilePath.indexOf('.') + 1, uploadFilePath.length());
System.out.println("uploadFileSuffix:" + uploadFileSuffix);
FileOutputStream fos = null;
FileInputStream fis = null;
try {
fis = (FileInputStream) multiReq.getFile("file").getInputStream();
//获取跟目录
File path = new File(ResourceUtils.getURL("classpath:").getPath());
if (!path.exists()) path = new File("");
System.out.println("path:" + path.getAbsolutePath());
//如果上传目录为/static/images/upload/，则可以如下获取：
File upload = new File(path.getAbsolutePath(), "static/images/upload/");
if (!upload.exists()) upload.mkdirs();
System.out.println("upload url:" + upload.getAbsolutePath());
//在开发测试模式时，得到的地址为：{项目跟目录}/target/static/images/upload/
//在打包成jar正式发布时，得到的地址为：{发布jar包目录}/static/images/upload/
fos = new FileOutputStream(upload + "/" + uploadFileName + "." + uploadFileSuffix);
byte[] temp = new byte[1024];
int i = fis.read(temp);
while (i != -1) {
fos.write(temp, 0, temp.length);
fos.flush();
i = fis.read(temp);
}
return "上传成功";
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fis != null) {
fis.close();
}
if (fos != null) {
fos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return "上传失败";
}