Java对文件路径进行Base64加密，防止盗链下载、右击图片完整例子。

业务场景是：对页面图片或者文件的src加密，即打开F12不可获取到图片地址。

具体实现：后台获取文件的真实地址，对地址进行Base64加密，页面采用指定格式回显即可。

• Base64加密工具类

import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;
import java.io.*;

public class Base64ToImg {

        public static String getImgStr(String imgFile){
            //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
            InputStream in = null;
            byte[] data = null;
            //读取图片字节数组
            try
            {
                in = new FileInputStream(imgFile);
                data = new byte[in.available()];
                in.read(data);
                in.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return new String(Base64.encodeBase64(data));
        }

}

• 后台接口

/**
 * 查找文件表加密地址
 */
@RequestMapping(value = "/selectFileToBase", method = RequestMethod.POST,produces = "application/json;charset=utf-8")
@ResponseBody
public ResulVO selectFileToBase(HttpServletRequest request) {
	try {
		String loanId = request.getParameter("loanId")==null?"":request.getParameter("loanId").trim();
		String loanConfigId = request.getParameter("loanConfigId")==null?"":request.getParameter("loanConfigId").trim();

		//查询条件
		Criteria criteria = new Criteria();
		criteria.clear();
		//条件
		if(StringUtils.isNotBlank(loanId)){
			criteria.put("loanId",loanId);
		}
		if(StringUtils.isNotBlank(loanConfigId)){
			criteria.put("loanConfigId",loanConfigId);
		}
		List<TFileConfig> fileConfigList = fileConfigService.selectByCondition(criteria);
		if (fileConfigList != null && fileConfigList.size() > 0){
			for (TFileConfig tFileConfig : fileConfigList){
				String imgUrl = tFileConfig.getRealPath();
				if(StringUtils.isBlank(imgUrl)){
					return ResulVOUtils.error(9999,"查询无数据");
				}
				//调用工具类加密
				String imgbase = Base64ToImg.getImgStr(imgUrl);
				tFileConfig.setBasePath(imgbase);
			}
		}
		if (fileConfigList != null && fileConfigList.size() > 0){
			return ResulVOUtils.success(fileConfigList);
		}else{
			return ResulVOUtils.error(9999,"查询无数据");
		}
	} catch (Exception e) {
		logger.error("FileConfigController.java-selectFileToBase-Exception: ", e);
		return ResulVOUtils.error(1009, "查询异常请重试！");
	}
}

页面方法 

//回显图片方法
function setImageInfo(str2){
	str2 ='#'+str2;
	var url = pcs.common.path + '/admin/fileConfig/selectFileToBase?loanId='+$("#loanId").val() + "&loanConfigId=" + $('#loanConfigId').val();
	$.post(url,{},function(data){
		if(data.code == 1){
			var list = data.rs;
			if(list != null && list != '' && list != undefined){
				for(var i = 0; i<list.length; i++){
					var obj = list[i];
					if( obj.filePath != null){
						var filePath =  obj.filePath;
						var fileConfigId = obj.fileConfigId;
						var pid = "c" +fileConfigId;
						
						//加密后的文件地址
						var basePath = obj.basePath;
						
						var content = '';
						var index = filePath.lastIndexOf("\.");
						content = filePath.substring(index,filePath.length);
						if(content == '.doc' || content == '.docx'){
							$(str2).append(' <div id="'+pid+'" style="display: inline-block;"><img oncontextmenu="return false;" src="../../ui/img/word.jpg" alt="" class="layui-upload-img"  style="width: 150px;height: 100px;margin-right: 10px">' +
								' </div>')
						}else if(content == '.txt'){ 
							$(str2).append(' <div id="'+pid+'" style="display: inline-block;"><img oncontextmenu="return false;" src="../../ui/img/txt.jpg" alt="" class="layui-upload-img"  style="width: 150px;height: 100px;margin-right: 10px">' +
								' </div>')
						}else if(content == '.pdf'){ 
							$(str2).append(' <div id="'+pid+'" style="display: inline-block;"><img oncontextmenu="return false;" src="../../ui/img/pdf.jpg" alt="" class="layui-upload-img"  style="width: 150px;height: 100px;margin-right: 10px">' +
								' </div>')
						}else if(content == '.xls' || content == '.xlsx' ){ 
							$(str2).append(' <div id="'+pid+'" style="display: inline-block;"><img oncontextmenu="return false;" src="../../ui/img/excel.jpg" alt="" class="layui-upload-img"  style="width: 150px;height: 100px;margin-right: 10px">' +
								' </div>')
						}else if(content == '.zip' || content == '.rar' ){
							$(str2).append(' <div id="'+pid+'" style="display: inline-block;"><img oncontextmenu="return false;" src="../../ui/img/zip.jpg" alt="" class="layui-upload-img"  style="width: 150px;height: 100px;margin-right: 10px">' +
								'</div>')
						}else{
							$(str2).append(' <div id="'+pid+'" style="display: inline-block;"><img oncontextmenu="return false;" src="data:image/jpg;base64,'+basePath+'" alt="" class="layui-upload-img"  style="width: 150px;height: 100px;margin-right: 10px">' +
								' </div>')
						}
					}
				}
			}
		}else{
			return;
		}
	},'json');
}

• 页面文件回显的格式（采用Base64指定格式回显），οncοntextmenu="return false;"这个属性设置禁止右击图片，也起到一定的安全的作用。

<img oncontextmenu="return false;" src="data:image/jpg;base64,'+basePath+'" alt="" class="layui-upload-img">

最后达到加密的效果，如图所示：