版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/ITw333/article/details/82831271
PropertiesUtil类 --获取某文件的属性值
public class PropertiesUtil {
private static Logger logger = LoggerFactory.getLogger(PropertiesUtil.class);
private static Properties props;
static {
String fileName = "mmall.properties";
props = new Properties();
try {
props.load(new InputStreamReader(PropertiesUtil.class.getClassLoader().getResourceAsStream(fileName),"UTF-8"));
} catch (IOException e) {
logger.error("配置文件读取异常",e);
}
}
public static String getProperty(String key){
String value = props.getProperty(key.trim());
if(StringUtils.isBlank(value)){
return null;
}
return value.trim();
}
public static String getProperty(String key,String defaultValue){
String value = props.getProperty(key.trim());
if(StringUtils.isBlank(value)){
value = defaultValue;
}
return value.trim();
}
}
MD5加密工具类（需要上面的工具类）
public class MD5Util {
private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));
return resultSb.toString();
}
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
/**
* 返回大写MD5
*
* @param origin
* @param charsetname
* @return
*/
private static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString.toUpperCase();
}
public static String MD5EncodeUtf8(String origin) {
origin = origin + PropertiesUtil.getProperty("password.salt", "");
return MD5Encode(origin, "utf-8");
}
private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
}
也可以对文件内容进行加密 在上面类里添加下面方法
调用为 MD5Util MD5Util.getFileMD5("d:\\file\\新建文本文档.txt")
/**
* 获取文件的MD5码
*
* @param absPath
* 文件路径
* @return 文件的MD5码
*/
public final static String getFileMD5(String absPath) {
try {
File file = new File(absPath);
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
FileInputStream fis = new FileInputStream(file);
FileChannel filechannel = fis.getChannel();//通道
MappedByteBuffer mbb = filechannel
.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
mdTemp.update(mbb);
byte[] md = mdTemp.digest();
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
fis.close();
return new String(str);
} catch (Exception e) {
return "";
}
}
FileUtil类 --保存、删除文件 拼接文件名
public class FileUtil {
/**
* 将MultipartFile保存到指定的路径下
*
* @param file Spring的MultipartFile对象
* @param savePath 保存路径
* @return 保存的文件名，当返回NULL时为保存失败。
* @throws IOException
* @throws IllegalStateException
*/
public static String save(MultipartFile file,String savePath) throws IllegalStateException, IOException {
if (file != null && file.getSize() > 0) {
File fileFolder = new File(savePath);
if (!fileFolder.exists()) {
fileFolder.mkdirs();
}
File saveFile = getFile(savePath, file.getOriginalFilename());
file.transferTo(saveFile);
return saveFile.getName();
}
return null;
}
/**
* 删除文件
*
* @param filePath
* 文件路径
* @return 是否删除成功：true-删除成功，false-删除失败
*/
public static boolean delete(String filePath) {
File file = new File(filePath);
if (file.isFile()) {
file.delete();
return true;
}
return false;
}
/**
* 拼接文件
* */
private static File getFile(String savePath, String originalFilename) {
//UUID.randomUUID().toString()生成16位数字
//String fileName =UUID.randomUUID().toString() + "_" + originalFilename;
String fileName = System.currentTimeMillis() + "_" + originalFilename;
File file = new File(savePath + fileName);
if (file.exists()) {
return getFile(savePath, originalFilename);
}
return file;
}
}
DateTime工具类 --String和Date之间的转换
public class DateTimeUtil {
//joda-time
//str->Date
//Date->str
public static final String STANDARD_FORMAT = "yyyy-MM-dd HH:mm:ss";
public static Date strToDate(String dateTimeStr, String formatStr){
DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(formatStr);
DateTime dateTime = dateTimeFormatter.parseDateTime(dateTimeStr);
return dateTime.toDate();
}
public static String dateToStr(Date date,String formatStr){
if(date == null){
return StringUtils.EMPTY;
}
DateTime dateTime = new DateTime(date);
return dateTime.toString(formatStr);
}
public static Date strToDate(String dateTimeStr){
DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(STANDARD_FORMAT);
DateTime dateTime = dateTimeFormatter.parseDateTime(dateTimeStr);
return dateTime.toDate();
}
public static String dateToStr(Date date){
if(date == null){
return StringUtils.EMPTY;
}
DateTime dateTime = new DateTime(date);
return dateTime.toString(STANDARD_FORMAT);
}
/*public static void main(String[] args) {
System.out.println(DateTimeUtil.dateToStr(new Date(),"yyyy-MM-dd HH:mm:ss"));
System.out.println(DateTimeUtil.strToDate("2010-01-01 11:11:11","yyyy-MM-dd HH:mm:ss"));
}*/
}