java创建和读取文件

 

package io;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;

public class IOHandle {

 public static void main(String[] args) {
  String path = "d:/新建文件夹/中国.txt";
  String content = "中国/t北京/t天安门";
  createFileTwo(path, content);
  readFileOne(path);
 }

 /**
  * 创建文件并向文件中写入内容
  *
  * @param path
  * @param content
  * @return
  */
 public static boolean createFileOne(String path, String content) {
  try {
   File file = new File(path);
   if (file.isDirectory()) {
    if (!file.exists()) {
     file.mkdirs();
    }
   } else {
    String p = file.getParent();
    File mkdir = new File(p);
    mkdir.mkdirs();
    file.createNewFile();
   }
   FileOutputStream out = new FileOutputStream(path, false);
   out.write(content.getBytes("utf-8"));
   out.flush();
   out.close();
  } catch (FileNotFoundException e) {
   return false;
  } catch (IOException e) {
   return false;
  }
  return true;
 }

 /**
  *
  * @param path
  * @param Str
  * @return
  */
 public static boolean createFileTwo(String path, String Str) {
  File file = new File(path);
  try {
   if (file.isDirectory()) {
    if (!file.exists()) {
     file.mkdirs();
    }
   } else {
    String p = file.getParent();
    File mkdir = new File(p);
    mkdir.mkdirs();
    file.createNewFile();
   }
   FileWriter writer = new FileWriter(file,true);
   BufferedWriter bwriter = new BufferedWriter(writer);
   bwriter.write(Str);
   bwriter.flush();
   bwriter.close();
  } catch (IOException e) {
   return false;
  }
  return true;
 }

 /**
  * 读取文件内容
  *
  * @param path
  */
 public static void readFileOne(String path) {
  File file = new File(path);
  if (file.exists()) {
   try {
    FileInputStream in = new FileInputStream(file);
    byte buffer[] = new byte[1024];
    int c;
    while ((c = in.read(buffer)) != -1) {
     String ss = new String(buffer,0,c);
     System.out.println(ss);
    }
    in.close();
   } catch (FileNotFoundException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } else {
   System.out.println("文件不存在");
  }
 }

 public static void copyFile(String src, String dest) {
  try {
   FileInputStream in = new FileInputStream(src);
   File file = new File(dest);
   if (!file.exists()) {
    file.createNewFile();
   }
   FileOutputStream out = new FileOutputStream(file);
   int c;
   byte buffer[] = new byte[1024];
   while ((c = in.read(buffer)) != -1) {
    for (int i = 0; i < c; i++) {
     out.write(buffer[i]);
    }
   }
   in.close();
   out.close();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 /**
  * 删除特定目录下所有文件夹和文件
  *
  * @param path
  */
 public static void delDir(String path) {
  File file = new File(path);
  File files[] = file.listFiles();
  for (int i = 0; i < files.length; i++) {
   File f = files[i];
   if (f.isDirectory()) {
    delDir(f.getAbsolutePath());
   } else {
    f.delete();
   }
  }
 }

 /**
  * 输出特定目录下所有文件夹和文件名
  *
  * @param path
  */
 public static void selectDir(String path) {
  File file = new File(path);
  File files[] = file.listFiles();
  for (int i = 0; i < files.length; i++) {
   if (files[i].isDirectory()) {
    System.out.println(files[i].getParent());
    selectDir(files[i].getAbsolutePath());
   } else {
    System.out.println(files[i].getName());
   }
  }
 }

}