这个方法只能在有限的范围内有效。并不是万金油
比如
图片类型判断，音频文件格式判断，视频文件格式判断等这种肯定是2进制且专业性很强的文件类型判断。
- 使用方法
String name= FileUtils.getType("/Users/sirai/Desktop/xz_sale_interface.zip").name();
logger.info("ssss"+name);
*FileUtils
package com.xiaozhi.xcloud.web.vo;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Created with IntelliJ IDEA.
* Package: com.xiaozhi.xcloud.web.vo
* Author: sirai
* Create Time: 17/3/3 下午2:45
* QQ: 785716471
* Description:
*/
public class FileUtils {
/**
* 将文件头转换成16进制字符串
*
* @param
* @return 16进制字符串
*/
private static String bytesToHexString(byte[] src){
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
private static String getFileContent(String filePath) throws IOException {
byte[] b = new byte[28];
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
inputStream.read(b, 0, 28);
} catch (IOException e) {
e.printStackTrace();
throw e;
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
throw e;
}
}
}
return bytesToHexString(b);
}
/**
* 判断文件类型
*
* @param filePath 文件路径
* @return 文件类型
*/
public static FileType getType(String filePath) throws IOException {
String fileHead = getFileContent(filePath);
if (fileHead == null || fileHead.length() == 0) {
return null;
}
fileHead = fileHead.toUpperCase();
FileType[] fileTypes = FileType.values();
for (FileType type : fileTypes) {
if (fileHead.startsWith(type.getValue())) {
return type;
}
}
return null;
}
}
- FileType枚举类型
package com.xiaozhi.xcloud.web.vo;
/**
* Created with IntelliJ IDEA.
* Package: com.xiaozhi.xcloud.web.vo
* Author: sirai
* Create Time: 17/3/3 下午2:17
* QQ: 785716471
* Description:
*/
public enum FileType {
/**
* JEPG.
*/
JPEG("FFD8FF"),
/**
* PNG.
*/
PNG("89504E47"),
/**
* GIF.
*/
GIF("47494638"),
/**
* TIFF.
*/
TIFF("49492A00"),
/**
* Windows Bitmap.
*/
BMP("424D"),
/**
* CAD.
*/
DWG("41433130"),
/**
* Adobe Photoshop.
*/
PSD("38425053"),
/**
* Rich Text Format.
*/
RTF("7B5C727466"),
/**
* XML.
*/
XML("3C3F786D6C"),
/**
* HTML.
*/
HTML("68746D6C3E"),
/**
* Email [thorough only].
*/
EML("44656C69766572792D646174653A"),
/**
* Outlook Express.
*/
DBX("CFAD12FEC5FD746F"),
/**
* Outlook (pst).
*/
PST("2142444E"),
/**
* MS Word/Excel.
*/
XLS_DOC("D0CF11E0"),
/**
* MS Access.
*/
MDB("5374616E64617264204A"),
/**
* WordPerfect.
*/
WPD("FF575043"),
/**
* Postscript.
*/
EPS("252150532D41646F6265"),
/**
* Adobe Acrobat.
*/
PDF("255044462D312E"),
/**
* Quicken.
*/
QDF("AC9EBD8F"),
/**
* Windows Password.
*/
PWL("E3828596"),
/**
* ZIP Archive.
*/
ZIP("504B0304"),
/**
* RAR Archive.
*/
RAR("52617221"),
/**
* Wave.
*/
WAV("57415645"),
/**
* AVI.
*/
AVI("41564920"),
/**
* Real Audio.
*/
RAM("2E7261FD"),
/**
* Real Media.
*/
RM("2E524D46"),
/**
* MPEG (mpg).
*/
MPG("000001BA"),
/**
* Quicktime.
*/
MOV("6D6F6F76"),
/**
* Windows Media.
*/
ASF("3026B2758E66CF11"),
/**
* MIDI.
*/
MID("4D546864");
private String value = "";
/**
* Constructor.
*
* @param type
*/
private FileType(String value) {
this.value = value;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
