将图片转成base64字符串并在JSP页面显示的Java代码

*本事例主要讲了如下几点:

* 1:将图片转换为BASE64加密字符串. * 2:将图片流转换为BASE64加密字符串. * 3:将BASE64加密字符串转换为图片.

* 4:在jsp文件中以引用的方式和BASE64加密字符串方式展示图片.

首先看工具类:

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import javax.imageio.ImageIO;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

/**

* @author IluckySi

* @since 20150122

*/

public class ImageUtil {

private static BASE64Encoder encoder = new sun.misc.BASE64Encoder();

private static BASE64Decoder decoder = new sun.misc.BASE64Decoder();

/**

* 将图片转换为BASE64加密字符串.

* @param imagePath 图片路径.

* @param format 图片格式.

* @return

*/

public String convertImageToByte(String imagePath, String format) {

File file = new File(imagePath);

BufferedImage bi = null;

ByteArrayOutputStream baos = null;

String result = null;

try {

bi = ImageIO.read(file);

baos = new ByteArrayOutputStream();

ImageIO.write(bi, format == null ? \: format, baos);

byte[] bytes = baos.toByteArray();

result = encoder.encodeBuffer(bytes).trim();

System.out.println(\将图片转换为BASE64加密字符串成功！\

} catch (IOException e) {

System.out.println(\将图片转换为 BASE64加密字符串失败: \+ e);

} finally {

try {

if(baos != null) {

baos.close();

baos = null;

}

} catch (Exception e) {

System.out.println(\关闭文件流发生异常: \+ e);