图片与Base64数据转换存储

来源：互联网发布：网络彩票停售编辑：程序博客网时间：2024/04/30 08:27

public static void main(String[] args) {        // 测试从Base64编码转换为图片文件        String strImg = "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";        GenerateImage(strImg, "D:\\aaaa.jpg");        // 测试从图片文件转换为Base64编码        System.out.println(GetImageStr("d:\\monkey_24.png"));    }    public static String GetImageStr(String imgFilePath) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理        byte[] data = null;        // 读取图片字节数组        try {            InputStream in = new FileInputStream(imgFilePath);            data = new byte[in.available()];            in.read(data);            in.close();        } catch (IOException e) {            e.printStackTrace();        }        // 对字节数组Base64编码        Encoder encoder = Base64.getEncoder();        return encoder.encodeToString(data);// 返回Base64编码过的字节数组字符串    }    public static boolean GenerateImage(String imgStr, String imgFilePath) {// 对字节数组字符串进行Base64解码并生成图片        if (imgStr == null) // 图像数据为空            return false;        Decoder decoder = Base64.getDecoder();        try {            // Base64解码            byte[] bytes = decoder.decode(imgStr);            for (int i = 0; i < bytes.length; ++i) {                if (bytes[i] < 0) {// 调整异常数据                    bytes[i] += 256;                }            }            // 生成jpeg图片            File file = new File(imgFilePath);            if (!file.exists()) {                file.createNewFile();            }            OutputStream out = new FileOutputStream(file);            out.write(bytes);            out.flush();            out.close();            return true;        } catch (Exception e) {            return false;        }    }

内联图片即使把图片文件编码成base64，优点是可以减少http的请求，缺点是不能跨域缓存，用html5的file api里的 readAsDataURL函数这是一个把文件转化成base64编码

w3c的文档 http://www.w3.org/TR/FileAPI/

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>简单的html5 File测试 for pic2base64</title><style></style><script>window.onload = function(){　　var input = document.getElementById("demo_input");　　var result= document.getElementById("result");　　var img_area = document.getElementById("img_area");　　if ( typeof(FileReader) === 'undefined' ){　　　　result.innerHTML = "抱歉，你的浏览器不支持 FileReader，请使用现代浏览器操作！";　　　　input.setAttribute( 'disabled','disabled' );　　} else {　　　　input.addEventListener( 'change',readFile,false );　　}}function readFile(){　　var file = this.files[0];　　//这里我们判断下类型如果不是图片就返回 去掉就可以上传任意文件　　if(!/image\/\w+/.test(file.type)){　　　　alert("请确保文件为图像类型");　　　　return false;　　}　　var reader = new FileReader();　　reader.readAsDataURL(file);　　reader.onload = function(e){　　　　result.innerHTML = '<img src="'+this.result+'" alt=""/>';　　　　img_area.innerHTML = '<div class="sitetip">图片img标签展示：</div><img src="'+this.result+'" alt=""/>';　　}}</script></head><body>　　<input type="file" value="sdgsdg" id="demo_input" />　　<textarea id="result" rows=30 cols=300></textarea>　　<p id="img_area"></p></body></html>

转自： http://www.cnblogs.com/fenglie/articles/4997588.html

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