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base64 显示图片和pdf,通过base64 编码在页面上显示图片和pdf,实现如下
1、图片
图片
java 代码,将图片转成 base64 字符串
- package com.tmp;
-
- import java.io.ByteArrayOutputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.IOException;
- import java.util.Base64;
-
- public class Demo1 {
-
- public static void main(String[] args) throws IOException {
- File file = new File("C:\\Users\\Administrator\\Desktop\\img\\xiyang.jpg");
-
- FileInputStream inputStream = new FileInputStream(file);
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
-
- byte[] bytes = new byte[1024];
- int len;
- while ((len = inputStream.read(bytes)) != -1) {
- baos.write(bytes, 0, len);
- }
-
- byte[] res = Base64.getEncoder().encode(baos.toByteArray());
- String str = new String(res);
-
- System.out.println(str);
- }
- }

base64 字符串
html 代码
在 img标签中显示 base64编码图片时,src后的 base64字符串添加前缀 data:image/png;base64,
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="UTF-8">
- <title></title>
- </head>
- <body>
- <img src="https://img-blog.csdnimg.cn/2022010700215296007.png" />
- </body>
- </html>
效果如下
2、pdf
pdf 内容
java代码
- package com.tmp;
-
- import java.io.ByteArrayOutputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.IOException;
- import java.util.Base64;
-
- public class Demo1 {
-
- public static void main(String[] args) throws IOException {
- File file = new File("C:\\Users\\Administrator\\Desktop\\article\\纳兰词一首.pdf");
-
- FileInputStream inputStream = new FileInputStream(file);
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
-
- byte[] bytes = new byte[1024];
- int len;
- while ((len = inputStream.read(bytes)) != -1) {
- baos.write(bytes, 0, len);
- }
-
- byte[] res = Base64.getEncoder().encode(baos.toByteArray());
- String str = new String(res);
-
- System.out.println(str);
- }
- }

base64 字符串
html 代码
在 iframe中显示 base64编码pdf 时,src后的 base64字符串添加前缀 data:application/pdf;base64,
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