获取文件路径相关

String path = this.getClass().getClassLoader().getResource("").getPath();
System.out.println("path="+path); //  path=/D:/java/workspace-idea/kafka-test-demo/target/classes

String path = this.getClass().getClassLoader().getResource("mybatis/test.xml").getPath();
System.out.println("path="+path);  //  path=/D:/java/workspace-idea/kafka-test-demo/target/classes/mybatis/test.xml

@RequestMapping("testdemo")
public String testdemo()throws Exception{
       String path = this.getClass().getClassLoader().getResource("").getPath();
       System.out.println("path="+path);
       File file = new File(path+"mybatis/test.txt");
       if(!file.exists()){
              file.createNewFile();
       }
       FileWriter fw = new FileWriter(file);
       for(int i=0;i<5;i++){
              fw.write("我就是测试一下啦啦啦,num="+i+",\r\n");
              fw.flush();
       }
       System.out.println("写数据成功啦!!!");
       fw.close();

       StringBuilder sb = new StringBuilder();
       BufferedReader reader = new BufferedReader(new FileReader(file));
       String s = null;
       while((s=reader.readLine()) != null){
              sb.append(System.lineSeparator()+s);
       }
       reader.close();
       System.out.println(sb.toString());
       return "ok";

}