/**
* 文件处理工具类
*/
public class FileUtils {
public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";
/**
* 输出指定文件的byte数组
*
* @param filePath 文件路径
* @param os 输出流
* @return
*/
public static void writeBytes(String filePath, OutputStream os) throws IOException {
FileInputStream fis = null;
try {
File file = new File(filePath);
if (!file.exists()) {
throw new FileNotFoundException(filePath);
}
fis = new FileInputStream(file);
byte[] b = new byte[1024];
int length;
while ((length = fis.read(b)) > 0) {
os.write(b, 0, length);
}
} catch (IOException e) {
throw e;
} finally {
IOUtils.close(os);
IOUtils.close(fis);
}
}
/**
* 读文件
* @param jsonPath 文件所在路径
* @return
*/
public static String readJson(String jsonPath){
String jsonStr = "";
try {
File file = new File(jsonPath);
FileReader fileReader = new FileReader(file);
// Reader reader = new InputStreamReader(new FileInputStream(file),"Utf-8");
Reader reader = new InputStreamReader(new FileInputStream(file));
int ch = 0;
StringBuffer sb = new StringBuffer();
while ((ch = reader.read()) != -1) {
sb.append((char) ch);
}
fileReader.close();
reader.close();
jsonStr = sb.toString();
return jsonStr;
} catch (Exception e) {
return null;
}
}
/**
* 写数据到文件中
*
* @param data 数据
* @return 目标文件
* @throws IOException IO异常
*/
public static String writeImportBytes(byte[] data) throws IOException
{
return writeBytes(data, RuoYiConfig.getImportPath());
}
/**
* 写数据到文件中
*
* @param data 数据
* @param uploadDir 目标文件
* @return 目标文件
* @throws IOException IO异常
*/
public static String writeBytes(byte[] data, String uploadDir) throws IOException
{
FileOutputStream fos = null;
String pathName = "";
try
{
String extension = getFileExtendName(data);
pathName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
File file = FileUploadUtils.getAbsoluteFile(uploadDir, pathName);
fos = new FileOutputStream(file);
fos.write(data);
}
finally
{
IOUtils.close(fos);
}
return FileUploadUtils.getPathFileName(uploadDir, pathName);
}
/**
* 写文件
* @param path json文件路径
* @param str json数据
* @return
* @throws IOException
*/
public static void writeJson(String path,String str) throws IOException {
FileWriter fw = new FileWriter(path);
PrintWriter out = new PrintWriter(fw);
out.write(str);
out.println();
fw.close();
out.close();
}
/**
* 删除文件
*
* @param filePath 文件
* @return
*/
public static boolean deleteFile(String filePath) {
boolean flag = false;
File file = new File(filePath);
// 路径为文件且不为空则进行删除
if (file.isFile() && file.exists()) {
file.delete();
flag = true;
}
return flag;
}
/**
* 文件名称验证
*
* @param filename 文件名称
* @return true 正常 false 非法
*/
public static boolean isValidFilename(String filename) {
return filename.matches(FILENAME_PATTERN);
}
/**
* 检查文件是否可下载
*
* @param resource 需要下载的文件
* @return true 正常 false 非法
*/
public static boolean checkAllowDownload(String resource) {
// 禁止目录上跳级别
if (StringUtils.contains(resource, "..")) {
return false;
}
// 检查允许下载的文件规则
if (ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource))) {
return true;
}
// 不在允许下载的文件规则
return false;
}
/**
* 下载文件名重新编码
*
* @param request 请求对象
* @param fileName 文件名
* @return 编码后的文件名
*/
public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException {
final String agent = request.getHeader("USER-AGENT");
String filename = fileName;
if (agent.contains("MSIE")) {
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
filename = new String(fileName.getBytes(), "ISO8859-1");
} else if (agent.contains("Chrome")) {
// google浏览器
filename = URLEncoder.encode(filename, "utf-8");
} else {
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
return filename;
}
/**
* 下载文件名重新编码
*
* @param response 响应对象
* @param realFileName 真实文件名
* @return
*/
public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException {
String percentEncodedFileName = percentEncode(realFileName);
StringBuilder contentDispositionValue = new StringBuilder();
contentDispositionValue.append("attachment; filename=")
.append(percentEncodedFileName)
.append(";")
.append("filename*=")
.append("utf-8''")
.append(percentEncodedFileName);
response.setHeader("Content-disposition", contentDispositionValue.toString());
}
/**
* 百分号编码工具方法
*
* @param s 需要百分号编码的字符串
* @return 百分号编码后的字符串
*/
public static String percentEncode(String s) throws UnsupportedEncodingException {
String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
return encode.replaceAll("\\+", "%20");
}
/**
* 获取图像后缀
*
* @param photoByte 图像数据
* @return 后缀名
*/
public static String getFileExtendName(byte[] photoByte)
{
String strFileExtendName = "jpg";
if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56)
&& ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97))
{
strFileExtendName = "gif";
}
else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70))
{
strFileExtendName = "jpg";
}
else if ((photoByte[0] == 66) && (photoByte[1] == 77))
{
strFileExtendName = "bmp";
}
else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71))
{
strFileExtendName = "png";
}
return strFileExtendName;
}
}
