将图片转成二进制并生成Base64编码，可以在网页中通过url查看图片

比眉伴天荒 2022-08-02 18:27 137阅读 0赞

data格式的Url最直接的好处是，这些Url原本会引起一个新的网络访问，因为那里是一个网页的地址，现在不会有新的网络访问了，因为现在这里是网页的内容。这样做，会减少服务器的负载，当然同时也增加了当前网页的大小。所以对“小”数据特别有好处。

另外听说这种方式可以将一些敏感的图片放进网页中...挺好玩的.....

一、 在网页中查看图片的方法为：

**\[html\]** [view plain][] [copy][view plain]

1.  **<****body****>**
2.  **<****span****>****<****img**width=100height=100src="data:image/gif;base64,（此处填图片转成base64编码后的编码）"**/>****</****span****>**
3.  **</****body****>**

由于base64编码太占用篇幅因此仅仅用括号说明了一下。

二、用Java将图片编码的代码，与将base64的编码转成图片的Java代码：

**\[java\]** [view plain][] [copy][view plain]

1.  **package** base64; 
2.  **import** java.awt.image.BufferedImage; 
3.  **import** java.io.ByteArrayInputStream; 
4.  **import** java.io.ByteArrayOutputStream; 
5.  **import** java.io.File; 
6.  **import** java.io.IOException; 
7.  **import** javax.imageio.ImageIO; 
8.  **import** sun.misc.BASE64Decoder; 
9.  **import** sun.misc.BASE64Encoder; 
10. 
11. **public****class** TestImageBinary \{ 
12. **static** BASE64Encoder encoder = **new** sun.misc.BASE64Encoder(); 
13. **static** BASE64Decoder decoder = **new** sun.misc.BASE64Decoder(); 
14. 
15. **public****static****void** main(String\[\] args) \{ 
16.  System.out.println(getImageBinary()); //将图片转成base64编码 
17.  base64StringToImage(getImageBinary()); //将base64的编码转成图片 
18.  \} 
19. 
20. **static** String getImageBinary()\{ 
21.  File f = **new** File("d://1.jpg"); 
22.  BufferedImage bi; 
23. **try** \{ 
24.  bi = ImageIO.read(f); 
25.  ByteArrayOutputStream baos = **new** ByteArrayOutputStream(); 
26.  ImageIO.write(bi, "jpg", baos); 
27. **byte**\[\] bytes = baos.toByteArray(); 
28. 
29. **return** encoder.encodeBuffer(bytes).trim(); 
30.  \} **catch** (IOException e) \{ 
31.  e.printStackTrace(); 
32.  \} 
33. **return****null**; 
34.  \} 
35. 
36. **static****void** base64StringToImage(String base64String)\{ 
37. **try** \{ 
38. **byte**\[\] bytes1 = decoder.decodeBuffer(base64String); 
39.  ByteArrayInputStream bais = **new** ByteArrayInputStream(bytes1); 
40.  BufferedImage bi1 =ImageIO.read(bais); 
41.  File w2 = **new** File("d://2.png");//可以是jpg,png,gif格式 
42.  ImageIO.write(bi1, "jpg", w2);//不管输出什么格式图片，此处不需改动 
43.  \} **catch** (IOException e) \{ 
44.  e.printStackTrace(); 
45.  \} 
46.  \} 
47. 
48. \}

此Java代码sun.misc.BASE64Decoder这个包导入不进去的话，请将eclipse的Java运行环境修改成不是eclipse自带的jdk，我本来导入不进去，换成本地1.7的jdk就OK了。

一下提供一个编码后图片的url:

**\[html\]** [view plain][] [copy][view plain]

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转自： [http://blog.csdn.net/caoyuan10036/article/details/7045190][http_blog.csdn.net_caoyuan10036_article_details_7045190]

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