当我写String file = "c:\plan.xml";    的时候提示如下报错

Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )

但是当我写成String file = "c:/plan.xml";

也有报错，到底是这个路径有问题还是其他问题呢？？

代码如下

package xmTest;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.OutputStreamWriter;

import java.io.Writer;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.io.SAXReader;

public class Hrxml {

public void write(){

String file = "c:/plan.xml";

SAXReader reader = new SAXReader();

try {

Document d = reader.read(file);

Element root = d.getRootElement();

Element e = root.addComment("course");

Element name = e.addElement("course-name");

name.setText("语文");

e.addElement("class-hour").setText("45");

e.addElement("exam-form").setText("考试");

Writer w = new OutputStreamWriter(new FileOutputStream(file),"UTF-8");

d.write(w);

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

        Hrxml h = new Hrxml();

        h.write();

}

}