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图片文件,图片文件流和BASE64加密字符串之间的转换,以及图片的BASE64加密字符串再jsp上如何显示

2015-01-23 00:33 726 查看
*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:

package com.ilucky.util.image;

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 ? "jpg" : 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);
			}
		}
		return result;
	}
	
	/**
	 * 将图片流转换为BASE64加密字符串.
	 * @param imageInputStream
	 * @param format 图片格式.
	 * @return
	 */
	public String convertImageStreamToByte(InputStream imageInputStream, String format) {
		BufferedImage bi = null;
		ByteArrayOutputStream baos = null;
		String result = null;
		try {
			bi = ImageIO.read(imageInputStream);
			baos = new ByteArrayOutputStream();
			ImageIO.write(bi, format == null ? "jpg" : format, baos);
			byte[] bytes = baos.toByteArray();
			result = encoder.encodeBuffer(bytes).trim();
			System.out.println("将图片流转换为BASE64加密字符串成功！");
		} catch (IOException e) {
			System.out.println("将图片流转换为 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);
			}
		}
		return result;
	}
	
	/**
	 * 将BASE64加密字符串转换为图片.
	 * @param base64String
	 * @param imagePath 图片生成路径.
	 * @param format 图片格式.
	 */
	public void convertByteToImage(String base64String, String imagePath, String format) {
		byte[] bytes = null;
		ByteArrayInputStream bais = null;
		BufferedImage bi = null;
		File file = null;
		try {
			bytes = decoder.decodeBuffer(base64String);
			bais = new ByteArrayInputStream(bytes);
			bi = ImageIO.read(bais);
			file = new File(imagePath);
			ImageIO.write(bi, format == null ? "jpg" : format, file);
			System.out.println("将BASE64加密字符串转换为图片成功！");
		} catch (IOException e) {
			System.out.println("将BASE64加密字符串转换为图片失败: " + e);
		} finally {
			try {
				if(bais != null) {
					bais.close();
					bais = null;
				}
			} catch (Exception e) {
				System.out.println("关闭文件流发生异常: " + e);
			}
		}
	}
}
然后看测试类：

package com.ilucky.util;

import java.io.InputStream;

import com.ilucky.util.image.ImageUtil;

/**
 * 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.
 * @author IluckySi
 * @since 20150122
 */
public class MainTest {

	public static void main(String[] args) {
		ImageUtil imageUtil = new ImageUtil();
		
		String base64String = imageUtil.convertImageToByte("D:\\test.png", "png");
		System.out.println(base64String);
		imageUtil.convertByteToImage(base64String, "D:\\test2.png", "png");
				
		InputStream is = MainTest.class.getResourceAsStream("test.png");
		String base64String2 = imageUtil.convertImageStreamToByte(is, "png");
		System.out.println(base64String2);
		imageUtil.convertByteToImage(base64String2, "D:\\test3.png", "png");
	}
}
最后看jsp文件:

<!DOCTYPE html>
<html>
  <head>
    <title>index.html</title>
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
  	<!-- 
  	data表示取得数据的协定名称,image/png是数据类型名称,base64 是数据的编码方法,
  	逗号后面是image/png文件base64编码后的数据. 
  	data:text/css;base64,base64编码的CSS代码 
	data:text/javascript,Javascript代码 
	data:text/javascript;base64,base64编码的Javascript代码 
	data:image/gif;base64,base64编码的gif图片数据 
	data:image/png;base64,base64编码的png图片数据 
	data:image/jpeg;base64,base64编码的jpeg图片数据 
	data:image/x-icon;base64,base64编码的icon图片数据 
  	 -->
  	<img src="test.png"/>
  	<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAFYklEQVR42sVXfUyUdRz/8XKhMZQO
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  </body>
</html>
部署项目，启动服务器,访问jsp页面,会看到浏览器上有两张一样的图片.
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