一個可以將圖片轉成base64編碼的工具類/**

*?Copyright?(c)?2011-2017,?瑪雅牛?(myaniu?AT?gmail?dot?com).

*

*?Licensed?under?the?Apache?License,?Version?2.0?(the?"License");

*?you?may?not?use?this?file?except?in?compliance?with?the?License.

*?You?may?obtain?a?copy?of?the?License?at

*

*??????http://www.apache.org/licenses/LICENSE-2.0

*

*?Unless?required?by?applicable?law?or?agreed?to?in?writing,?software

*?distributed?under?the?License?is?distributed?on?an?"AS?IS"?BASIS,

*?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND,?either?express?or?implied.

*?See?the?License?for?the?specific?language?governing?permissions?and

*?limitations?under?the?License.

*/

package?com.jfinal.kit;

import?java.awt.image.BufferedImage;

import?java.io.ByteArrayOutputStream;

import?java.io.File;

import?java.io.IOException;

import?javax.imageio.ImageIO;

public?class?ImageKit?{

private?ImageKit()?{

}

/**

*?生成形如data:image/jpeg;base64,iVBORw0KGgoA……的字符串，將圖片文件Data?URI化

*

*?@param?imageFilePath?圖片文件路徑

*?@return?形如data:image/jpeg;base64,iVBORw0KGgoA……的字符串

*?@throws?IOException

*/

public?static?String?encodeDataUri(String?imageFilePath)?throws?IOException{

return?encodeDataUri(new?File(imageFilePath));

}

/**

*?生成形如data:image/jpeg;base64,iVBORw0KGgoA……的字符串，將圖片文件Data?URI化

*

*?@param?imageFile?圖片文件對象

*?@return?形如data:image/jpeg;base64,iVBORw0KGgoA……的字符串

*?@throws?IOException

*/

public?static?String?encodeDataUri(File?imageFile)?throws?IOException{

String?type?=?FileKit.getFileExtension(imageFile).toLowerCase();

if("jpg".equals(type))?{

type?=?"jpeg";

}

return?"data:image/"+type+";base64,"?+?encodeBase64(imageFile);

}

/**

*?將文件編碼成base64格式

*

*?@param?imageFilePath?圖片文件路徑

*?@return?base64編碼格式的字符串

*?@throws?IOException

*/

public?static?String?encodeBase64(String?imageFilePath)?throws?IOException{

return?encodeBase64(new?File(imageFilePath));

}

/**

*?將文件編碼成base64格式

*

*?@param?imageFile?圖片文件對象

*?@return?base64編碼格式的字符串

*?@throws?IOException

*/

public?static?String?encodeBase64(File?imageFile)?throws?IOException{

BufferedImage?bi?=?ImageIO.read(imageFile);

String?type?=?FileKit.getFileExtension(imageFile).toLowerCase();

ByteArrayOutputStream?baos?=?new?ByteArrayOutputStream();

ImageIO.write(bi,type,?baos);

return?Base64Kit.encode(baos.toByteArray());

}

}

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