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/**
*
*/
/**
* @author CHN
*文件输入输出
*/
import java.io.*;
import javax.swing.*;
public class test1 {
private BufferedWriter writer=null;
private boolean Flg=false;
public String dir="E:/workspace/TestSpace/";
private void createFile(){
try{
if(!(new File(dir).isDirectory())){
new File(dir).mkdir(); //创建文件
}
new File(dir +"newdata/").mkdir(); //创建文件夹
if(new File(dir +"myfile.txt").exists()){ //如果文件存在就删除文件
deleteFile(new File(dir +"myfile.txt"));
}
File myFile = new File(dir +"myfile.txt"); //声明myFile实例
myFile.createNewFile(); //创建一个新的文件
}catch(Exception e){
System.out.println("can not make directory");
}
}
private void deleteFile(File file){ // 删除文件
file.delete();
}
private void writerFile(String dir,String str){ //写文件
try{
if (writer==null){ //程序启动第一次加载时,创建文件
writer = new BufferedWriter(new FileWriter(new File(dir)));
}
writer.write(str); //向文件里写数据
writer.newLine(); //增加一行
writer.flush(); //释放缓冲区并更新
}catch(Exception e){
e.printStackTrace();
}
}
private void readerFile(String dir){ //读文件
StringBuffer sb = new StringBuffer();
String str=null;
try{
if(new File(dir).isDirectory()){ //文件是否存在,不存在退出程序。
//System.out.println("异常!文件不存在。程序将结束");
JOptionPane.showMessageDialog(null, "异常!文件不存在。程序将结束" );
System.exit(0); //退出程序
}
BufferedReader reader=new BufferedReader(new FileReader(new File(dir)));
while ((str = reader.readLine()) != null) {
sb.append(str);
sb.append("\n");//换行
writerFile("E:/workspace/TestSpace/myfile.txt",sb.toString());
sb.delete(0,sb.length()); // 删除StringBuffer sb中的数据。
}
}catch(Exception e){
e.printStackTrace();
}
}
//public void setFlg(boolean flag){
// this.Flg=flag;
//}
//public boolean isFlg(){
// return Flg;
//}
public static void main(String[] args) {
String dir="E:/workspace/TestSpace/myfile.txt";
String writeDir="E:/workspace/TestSpace/writerfile.txt";
test1 ts=new test1();
ts.createFile();
ts.readerFile(writeDir);
ts.writerFile(dir, "abcdefghijklmnopqrstuvwxyz");
ts.writerFile(dir, "1234567890");
}
}
import java.io.*;
import java.util.*;
public class ReadFile{
public static void main(String[] args){
List<String> list=new ArrayList<String>();
try{
BufferedReader br=new BufferedReader(new FileReader("a.txt"));
String s;
int i=0;
while((s=br.readLine())!=null)
{
list.add(s);
//System.out.println(++i+":"+s);
}
br.close();
}catch(FileNotFoundException e1){
System.err.print("File not found!");
}catch(IOException e2){
System.out.print(e2);
}
Iterator it=list.iterator();
while(it.hasNext()){
System.out.println(it.next());
}
}
}
package org;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class Csdn {
public static void main(String[] args) throws IOException{
BufferedReader bf = null;
try{
bf = new BufferedReader(new FileReader(new File("E:\\test.txt")));
List<String> list = new ArrayList<String>();
String line = null;
while((line=bf.readLine())!=null)
list.add(line);
String[] array = list.toArray(new String[0]);
for(String s:array)
System.out.println(s);
}finally{
if(bf!=null)
bf.close();
}
}
}
package org;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class Csdn {
public static void main(String[] args) throws IOException{
BufferedReader bf = new BufferedReader(new FileReader(new File("E:\\test.txt")));
List<String> list = new ArrayList<String>();
String line = null;
while((line=bf.readLine())!=null)
list.add(line);
String[] array = list.toArray(new String[0]);
for(String s:array)
System.out.println(s);
}
}