* 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:
然后看测试类:
- 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 ? "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);
- }
- }
- }
- }
- 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");
- }
- }
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.
- <!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 src1="test.png"/>
- <img src1="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAFYklEQVR42sVXfUyUdRz/8XKhMZQO
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- AABJRU5ErkJggg=="/>
- </body>
- </html>
来源: http://www.phpxs.com/code/1001659/