将sqlserver中的图片打成zip包

//打包。。

public static void  zipTest(){

//获取图片集合，这里用ThPhoto实体保存图片信息

List<TbPhoto> list = d.returnAllPhoto();

System.out.println(list.size() );
try {
FileOutputStream f = new FileOutputStream("d:\\图片.zip");
ZipOutputStream out = new ZipOutputStream(new DataOutputStream(f));
int i = 0;
for (TbPhoto photo : list) {
// System.out.println("开始压缩图片。。。");
//photo.getContent就是从数据库中读出来就是图片字节数组。byte[]
ByteArrayInputStream inStream = new ByteArrayInputStream(photo
.getContent());
DataInputStream in = new DataInputStream(inStream);
out.putNextEntry(new ZipEntry(i + "."
+ getTypeByStream(photo.getContent())));
int c;
while ((c = in.read()) != -1)
out.write(c);
in.close();
i++;
}
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}


/**
* 将此字节数组的头4位截取，然后转成16进制字符串
* @param src
* @return
*/
public static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length < 4) {
return null;
}
for (int i = 0; i < 4; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}


/**
* 获取图片类型
* @param b
* @return
*/
public static String getTypeByStream(byte[] b) {
String type = bytesToHexString(b).toUpperCase();
if (type.contains("FFD8FF")) {
return "jpg";
} else if (type.contains("89504E47")) {
return "png";
} else if (type.contains("47494638")) {
return "gif";
} else if (type.contains("49492A00")) {
return "tif";
} else if (type.contains("424D")) {
return "bmp";
}
return type;

}