//1.创建文件夹   
//import java.io.*;   
File myFolderPath = new File(str1);   
try {   
    if (!myFolderPath.exists()) {   
       myFolderPath.mkdir();   
    }   
}   
catch (Exception e) {   
    System.out.println("新建目录操作出错");   
    e.printStackTrace();   
}    
  
//2.创建文件   
//import java.io.*;   
File myFilePath = new File(str1);   
try {   
    if (!myFilePath.exists()) {   
        myFilePath.createNewFile();   
    }   
    FileWriter resultFile = new FileWriter(myFilePath);   
    PrintWriter myFile = new PrintWriter(resultFile);   
    myFile.println(str2);   
    resultFile.close();   
}   
catch (Exception e) {   
    System.out.println("新建文件操作出错");   
    e.printStackTrace();   
}    
  
//3.删除文件   
//import java.io.*;   
File myDelFile = new File(str1);   
try {   
    myDelFile.delete();   
}   
catch (Exception e) {   
    System.out.println("删除文件操作出错");   
    e.printStackTrace();   
}    
  
//4.删除文件夹   
//import java.io.*;   
File delFolderPath = new File(str1);   
try {   
    delFolderPath.delete(); //删除空文件夹   
}   
catch (Exception e) {   
    System.out.println("删除文件夹操作出错");   
    e.printStackTrace();   
}    
  
//5.删除一个文件下夹所有的文件夹   
//import java.io.*;   
File delfile=new File(str1);   
File[] files=delfile.listFiles();   
for(int i=0;i<files.length;i++){   
    if(files[i].isDirectory()){   
        files[i].delete();   
    }   

文件操作