文件复制路径问题，请问问题出在哪儿了？

public class CopyFileDemo {
public static void main(String[] args) throws Exception {
FileReader fr = new FileReader("e:/dji.txt");
FileWriter fw = new FileWriter("e:/djicopy.txt");
int ch;
while((ch=fr.read())!=-1) {
fw.write(ch);
}
fw.close();
fr.close();
}
}

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文件放在e盘根目录了，想做个文件复制的demo，每次都提醒是
Exception in thread "main" java.io.FileNotFoundException: e:\dji.txt (系统找不到指定的文件。)

文件路径换成\\