在获取图片路径时报错，图片存在，路径也是对的，不知道为什么会报错

W/System.err: java.io.FileNotFoundException: D:/test/test1.png
W/System.err: at com.zbr.baidudemo.utils.FileUtil.readFileByBytes(FileUtil.java:43)
at com.zbr.baidudemo.MainActivity.start(MainActivity.java:54)
at com.zbr.baidudemo.MainActivity.init(MainActivity.java:42)
at com.zbr.baidudemo.MainActivity.onCreate(MainActivity.java:27)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)