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/*****************************************************************
* File name: PicsModel.java
* Create date: 2003-11-18
* Copyright: Copyright (c) 2003 by HEKAI
* @Version: 1.0
* Modify History
* Author Date Description
* hekai 2003-11-18 Create the PicsModel.java
*****************************************************************/
//请用你的相应包名进行替换
package bmptest;
import java.io.Serializable;
public class PicsModel implements Serializable
{
private String picsExtendName = null;
private int picsWidth = 0;
private int picsHeight = 0;
private String picsColor = null;
private String picsSize = null;
public PicsModel()
{
}
public String getpicsExtendName()
{
return picsExtendName;
}
public void setpicsExtendName(String picsExtendName)
{
this.picsExtendName = picsExtendName;
}
public int getpicsWidth()
{
return picsWidth;
}
public void setpicsWidth(int picsWidth)
{
this.picsWidth = picsWidth;
}
public int getpicsHeight()
{
return picsHeight;
}
public void setpicsHeight(int picsHeight)
{
this.picsHeight = picsHeight;
}
public String getpicsColor()
{
return picsColor;
}
public void setpicsColor(String picsColor)
{
this.picsColor = picsColor;
}
public String getpicsSize()
{
return picsSize;
}
public void setpicsSize(String picsSize)
{
this.picsSize = picsSize;
}
}
readpic.java代码：
/*****************************************************************
* File name: readpic.java
* Create date: 2003-11-18
* Copyright: Copyright (c) 2003 by HEKAI
* @Version: 1.0
* Modify History
* Author Date Description
* hekai 2003-11-18 Create the readpic.java
*****************************************************************/
//请用你的相应包名进行替换
package bmptest;
import java.io.*;
public class readpic
{
public static void main(String[] args)
{
PicsModel model = getFileAttributes("E:/hekai/hk0001.jpg");
// "E:\\hekai\\hk0001.jpg" 也是可以的
System.out.println("picextendname is:"+model.getpicsExtendName());
System.out.println("picwidth is:"+model.getpicsWidth());
System.out.println("picheight is:"+model.getpicsHeight());
System.out.println("piccolor:"+model.getpicsColor());
System.out.println("picsize:"+model.getpicsSize());
}
private static PicsModel getFileAttributes(String picpath)
{
PicsModel model = null;
String picextendname;
picextendname = null;
byte[] content = null;
try
{
content = readFromFile(picpath);
int k;
k = content.length;
//不想处理的话，请直接获取其字节数
Integer kk;
kk = null;
String picsize;
picsize = null;
if (k >= 1024)
{
//bigger than fact pic file sizes
k = k / 1024 + 1;
kk = new Integer(k);
picsize = kk.toString() + "K";
}
else if (k > 0)
{
kk = new Integer(k);
picsize = kk.toString();
}
model = new PicsModel();
model.setpicsSize(picsize);
}
catch( IOException e )
{
content = new byte[0];
e.printStackTrace();
}
picextendname = getFileExtendName(content);
int picwidth,picheight,color;
String piccolor;
picwidth = 0;
picheight = 0;
color = 0;
piccolor = null;
if (picextendname.equals("GIF"))
{
//picwidth position
picwidth = getFileAttribute(content,7,2,picextendname);
//picheight position
picheight = getFileAttribute(content,9,2,picextendname);
//piccolor position
color = getFileAttribute(content,10,1,picextendname);
color = color % 8 + 1;
piccolor = getPicColor(color);
}
if (picextendname.equals("JPG"))
{
//考虑了两种情况
picwidth = getFileAttribute(content,166,2,picextendname);
picheight = getFileAttribute(content,164,2,picextendname);
color = getFileAttribute(content,167,1,picextendname);
color = color * 8;
if ((picwidth == 0 )||(picheight == 0)||(Color > 3))
{
picwidth = getFileAttribute(content,197,2,picextendname);
picheight = getFileAttribute(content,195,2,picextendname);
color = getFileAttribute(content,198,1,picextendname);
color = color * 8;
}
piccolor = getPicColor(color);
}
if (picextendname.equals("BMP"))
{
picwidth = getFileAttribute(content,19,2,picextendname);
picheight = getFileAttribute(content,23,2,picextendname);
color = getFileAttribute(content,28,1,picextendname);
piccolor = getPicColor(color);
}
if (picextendname.equals("PNG"))
{
picwidth = getFileAttribute(content,19,2,picextendname);
picheight = getFileAttribute(content,23,2,picextendname);
// usually is "16M"??
piccolor = "16M";
}
model.setpicsExtendName(picextendname);
model.setpicsWidth(picwidth);
model.setpicsHeight(picheight);
model.setpicsColor(piccolor);
return model;
}
private static byte[] readFromFile(String fileName) throws IOException
{
PicsModel model = null;
FileInputStream fin = new FileInputStream(fileName);
byte [] buf = new byte[fin.available()];
fin.read(buf);
fin.close();
return buf;
}
private static String getFileExtendName(byte[] byte1)
{
String strFileExtendName;
strFileExtendName = null;
//header bytes contains GIF87a or GIF89a?
if ((byte1[0] == 71)&&(byte1[1] == 73)&&(byte1[2] == 70)&&(byte1[3] == 56)&&((byte1[4] == 55)||(byte1[4] == 57))&&(byte1[5] == 97))
{
strFileExtendName = "GIF";
}
//header bytes contains JFIF?
if ((byte1[6] == 74)&&(byte1[7] == 70)&&(byte1[8] == 73)&&(byte1[9] == 70))
{
strFileExtendName = "JPG";
}
//header bytes contains BM?
if ((byte1[0] == 66)&&(byte1[1] == 77))
{
strFileExtendName = "BMP";
}
//header bytes contains PNG?
if ((byte1[1] == 80)&&(byte1[2] == 78)&&(byte1[3] == 71))
{
strFileExtendName = "PNG";
}
return strFileExtendName;
}
private static int getFileAttribute(byte[] byte2,int n,int m,String fileextendname)
{
int j,FileAttributeValue;
j = 0;
FileAttributeValue = 0;
String str,str1;
str = "";
str1 = "";
//如果其大于127，则反之出现少于0，需要进行＋256运算
for (int k = 0; k < m; k ++)
{
if (byte2[n-k] < 0)
{
j = byte2[n-k];
j = j + 256;
}
else
{
j = byte2[n-k];
}
str1 = Integer.toHexString(j);
//转化为16进制，不足位补0
if (str1.length() < 2)
{
str1 = "0" + str1;
}
//格式的不同，表达属性的字节也有变化
if(fileextendname.equalsIgnoreCase("JPG")||fileextendname.equalsIgnoreCase("PNG"))
{
str = str1 + str;
}
else
{
str = str + str1;
}
}
FileAttributeValue = HexToDec(str);
return FileAttributeValue;
}
private static int HexToDec(String cadhex)
{
int n, i, j,k,decimal;
String CADHEX1;
n = 0;
i = 0;
j = 0;
k = 0;
decimal = 0;
CADHEX1 = null;
n =cadhex.length();
CADHEX1 = cadhex.trim().toUpperCase();
while(i < n)
{
j = CADHEX1.charAt(i);
if ((j >= 48) && (j < 65))
{
j = j - 48;
}
if (j >= 65)
{
j = j - 55;
}
i = i + 1;
//16幂运算
k = 1;
for (int m = 0; m < (n-i); m ++)
{
k = 16 * k;
}
decimal = j*k + decimal;
}
return decimal;
}
private static String getPicColor(int color)
{
int k;
k = 1;
String piccolor;
piccolor = null;
//2幂运算
for (int m = 0; m < color; m ++)
{
k = 2 * k;
}
Integer kk;
kk = null;
if (k >= 1048576)
{
k = k / 1048576;
kk = new Integer(k);
piccolor = kk.toString() + "M";
}
else if (k >= 1024)
{
k = k / 1024;
kk = new Integer(k);
piccolor = kk.toString() + "K";
}
else if (k > 0)
{
kk = new Integer(k);
piccolor = kk.toString();
}
return piccolor;
}
}
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