Java IO：构造文件路径

这篇文章介绍两种构造文件路径的方法：
1.检查操作系统类型，然后手工创建路径分隔符（不推荐）
2.使用java File类中的File.separator（最佳实践）

File.separator 会检查你的操作系统，并显示正确的分隔符，例如：
1. Windows下--返回 "\"
2. *nix下--返回"/"

手工创建文件分隔符的例子：

package org.hnrsc.io;

import java.io.File;
import java.io.IOException;

//
public class JavaFileIO {

    public static void main(String[] args){
        try{
            String filename = "test.txt";
            String finalfile = "";
            String workingDir = System.getProperty("user.dir");

            String your_os = System.getProperty("os.name").toLowerCase();
            if(your_os.indexOf("win") >= 0){
                finalfile = workingDir + "\\" + filename;
            }else if(your_os.indexOf("nix")>=0 || your_os.indexOf("nux")>=0){
                finalfile = workingDir + "/" +filename;
            }else{
                finalfile = workingDir + "{other}" + filename;
            }
            System.out.println("Final filepath: " + finalfile);

            File file = new File(finalfile);

            if(file.createNewFile()){
                System.out.println("File is created");
            }else{
                System.out.println("File already exisit.");
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}

使用File.separator的例子：

package org.hnrsc.io;

import java.io.File;
import java.io.IOException;

//
public class JavaFileIO {

    public static void main(String[] args){
        try{
            String filename = "test1.txt";
            String finalfile = "";
            String workingDir = System.getProperty("user.dir");

            //The system-dependent default name-separator character, represented as a string for convenience
            finalfile = workingDir + File.separator + filename;

            System.out.println("Final filepath: " + finalfile);

            File file = new File(finalfile);

            if(file.createNewFile()){
                System.out.println("File is created");
            }else{
                System.out.println("File already exisit.");
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}