Base64工具類（JAVA&JS）

JAVA:

package util;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
 
import org.apache.commons.lang.StringUtils;
 
import com.alibaba.druid.util.Base64;
 
/**
 * @description base64工具類
 * @author 
 * 
 */
public class Base64Util {
     /**
         * @desctiption base64轉圖片 (默認存放Tomcat中upload_files下,默認格式png)
         * @param strBase64(base64),path(相對路徑存儲路徑),filename(文件名,默認為時間戳)
         * @author 
         */
      public static  boolean  base64ToPic(String strBase64,String path,String filename){
             if(StringUtils.isEmpty(strBase64)){
                   System.out.println("Base64為空");
                   return false; 
               }
             Date date = new Date();
              long datetime =  date.getTime();
              String catalina_base=System.getProperty("catalina.base");
              //上傳文件保存位置
              path =catalina_base+"/upload_files/"+path;
              File f = new File(path);
              if(!f.exists()){
                f.mkdirs();
              }
             Base64 base = new Base64();
 
             byte[] b = base.base64ToByteArray(strBase64);
             for(int i=0;i<b.length;++i){
                 if(b[i]<0){
                     b[i]+=256;
                 }
             }
             String imgFilePath = path+"/"+datetime+".png";
             if(StringUtils.isNotEmpty(filename)){
                    imgFilePath = path+"/"+filename;
             }
             try {
                OutputStream out = new FileOutputStream(imgFilePath);
                out.write(b);
                out.flush();
                out.close();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                System.out.println("Base64轉圖片失敗");
                return false;
            }
           
        
            
           return true;
     }
       
      /**
     * @desctiption 圖片轉base64
     * @param picPath (文件路徑)
     * @author 
     */
      public  static  String picToBase64(String picPath){
        
          File f = new File(picPath);
          if(!f.isDirectory()){
              System.out.println("此文件路徑無效！");
              return null;
          }
        
        InputStream in = null;
        byte[] data = null;
        try {
            in = new FileInputStream(picPath);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Base64 base = new Base64();
        String base64 = base.byteArrayToBase64(data);
        return base64;
      }
}

 

 

JS：

<script type="text/javascript">
        function test() {
            var url = "1.png";//這是站內的一張圖片資源，采用的相對路徑
            convertImgToBase64(url, function (base64Img) {
                //轉化后的base64
                document.write(base64Img);
            });
        }

        //實現將項目的圖片轉化成base64
        function convertImgToBase64(url, callback, outputFormat) {
            var canvas = document.createElement('CANVAS'),
                ctx = canvas.getContext('2d'),
                img = new Image;
            img.crossOrigin = 'Anonymous';
            img.onload = function () {
                canvas.height = img.height;
                canvas.width = img.width;
                ctx.drawImage(img, 0, 0);
                var dataURL = canvas.toDataURL(outputFormat || 'image/png');
                callback.call(this, dataURL);
                canvas = null;
            };
            img.src = url;
        }
    </script>