//1 使用Scanner类解析文件。
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.*;
public class Main {
public static void main(String[] args) throws FileNotFoundException {
// TODO Auto-generated method stub
System.setIn(new FileInputStream("e://test.txt"));
Scanner reader = new Scanner(System.in);
while(reader.hasNext())
{
String line = reader.nextLine();
System.out.println(line);
}
}
}
//2 利用对象输入/输出流进行文件的读写。
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.*;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
Student s1 = new Student("1001", "abv", 12);
Student s2 = new Student("1001", "aqe", 14);
Student[] stuarray = new Student[] {s1, s2};
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream("e://test.txt"));
ObjectInputStream is = new ObjectInputStream(new FileInputStream("e://test.txt"));
os.writeObject(stuarray);
Object ro = is.readObject();
Student[] stu = (Student[])ro;
for(Student s:stu)
{
System.out.println(s);
}
}
}
class Student implements Serializable {
private static final long serialVersionUID = 1L;
String id, name;
int age;
public Student(String id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
//3 用打开文本对话框选取文件,读写文件内容。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.*;
import javax.swing.JFileChooser;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
JFileChooser ch = new JFileChooser();
/*ch.showOpenDialog(null);
ch.showSaveDialog(null);*/
BufferedReader br;
BufferedWriter bw;
StringBuffer buffer = new StringBuffer();
int result = ch.showOpenDialog(null);
if(result == JFileChooser.APPROVE_OPTION)
{
File file = ch.getSelectedFile();
br = new BufferedReader(new FileReader(file));
String line;
while((line = br.readLine())!=null)
{
buffer.append(line);
}
System.out.println(buffer);
br.close();
}
result = ch.showSaveDialog(null);
if(result == JFileChooser.APPROVE_OPTION)
{
File file = ch.getSelectedFile();
bw = new BufferedWriter(new FileWriter(file));
bw.write(buffer.toString());
bw.flush();
bw.close();
}
}
}
//4 读取网络资源,写出代码至文件。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.net.URL;
import java.util.*;
import javax.swing.JFileChooser;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
URL url = new URL("http://www.sdut.edu.cn");
InputStream is = url.openStream();
OutputStream os = new FileOutputStream("sdut.html");
byte[] bytes = new byte[100];
int len;
while ((len = is.read(bytes)) != -1) {
os.write(bytes, 0, len);
}
is.close();
os.close();
}
}
//5 利用各种输入输出流进行读写文件,分析其读写效率。
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.Writer;
import java.net.URL;
import java.util.*;
import javax.swing.JFileChooser;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
InputStream is=new FileInputStream("d:\\test1.txt");
OutputStream os=new FileOutputStream("d:\\test2.txt");
long l1=System.currentTimeMillis();
byte[] bytes=new byte[10];
int len;
while((len=is.read(bytes))!=-1)
{
os.write(bytes,0,len);
System.out.println(new String(bytes,0,len));
}
is.close();
os.close();
long l2=System.currentTimeMillis();
System.out.println(l2-l1); //FileInputStream,FileOutputStream
BufferedInputStream bis=new BufferedInputStream(new FileInputStream("e:\\test1.txt"));
BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("e:\\test2.txt"));
l1=System.currentTimeMillis();
while((len=bis.read(bytes))!=-1)
{
bos.write(bytes,0,len);
System.out.println(new String(bytes,0,len));
}
bis.close();
bos.close();
l2=System.currentTimeMillis();
System.out.println(l2-l1); //BufferedInputStream,BufferedOutputStream
DataInputStream dis=new DataInputStream(new FileInputStream("e:\\test1.txt"));
DataOutputStream dos=new DataOutputStream(new FileOutputStream("e:\\test2.txt"));
l1=System.currentTimeMillis();
while((len=dis.read(bytes))!=-1)
{
dos.write(bytes,0,len);
System.out.println(new String(bytes,0,len));
}
dis.close();
dos.close();
l2=System.currentTimeMillis();
System.out.println(l2-l1); //DataInputStream,DataOutputStream
Reader ir=new FileReader("e:\\test1.txt");
Writer wr=new FileWriter("e:\\test2.txt");
l1=System.currentTimeMillis();
char[] chars=new char[10];
while((len=ir.read(chars))!=-1)
{
wr.write(chars,0,len);
String str=new String(chars,0,len);
System.out.println(str);
}
ir.close();
wr.close();
l2=System.currentTimeMillis();
System.out.println(l2-l1); //FileReader,FileWriter
Reader br=new BufferedReader(new FileReader("e:\\test1.txt"));
Writer bw=new BufferedWriter(new FileWriter("e:\\test2.txt"));
l1=System.currentTimeMillis();
while((len=br.read(chars))!=-1)
{
bw.write(chars,0,len);
String str=new String(chars,0,len);
System.out.println(str);
}
ir.close();
wr.close();
l2=System.currentTimeMillis();
System.out.println(l2-l1); //BufferedReader,BufferedWriter
}
}
//6 利用DataInputStream和DataOutputStream读写文件。
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.Writer;
import java.net.URL;
import java.util.*;
import javax.swing.JFileChooser;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
OutputStream os = new FileOutputStream("e:/test.txt");
InputStream in = new FileInputStream("e:/test.txt");
DataOutputStream du = new DataOutputStream(os);
DataInputStream di = new DataInputStream(in);
//du.writeByte(’1’);
for(int i = 1; i<=100; i++)
{
du.writeInt(i);
}
char a = 'A';
for(int i = 1; i <= 26; i++)
{
du.writeChar(a);
a++;
}
char b = 'a';
for(int i = 1; i <= 26; i++)
{
du.writeChar(b);
b++;
}
for(int i = 1; i <=100; i++)
{
int j = di.readInt();
System.out.println(j);
}
for(int i = 1; i <= 52; i++)
{
char j = di.readChar();
System.out.println(j);
}
di.close();
du.close();
os.close();
in.close();
}
}
//7 利用File类进行文件及文件夹名称的显示。
import java.io.File;
import java.io.FilenameFilter;
public class test2 {
public static void main(String[] args) {
File f = new File("d:\\test");
file_open(f);
System.out.println("============================");
String[] lfn = f.list(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
// TODO Auto-generated method stub
if(name.endsWith(".txt"))
{
return true;
}
return false;
}
});
for(String fff:lfn)
{
System.out.println(fff);
}
}
public static void file_open(File f)
{
if(f!=null)
{
File[] lf = f.listFiles();
if(lf!=null)
{
for(File fff:lf)
{
if(fff.isDirectory())
{
System.out.println("Directory:"+fff);
file_open(fff);
}
else
{
System.out.println("File:"+fff);
}
}
}
}
}
}
//8 使用File类创建一个多层目录d:\java\ch10\src。
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.Writer;
import java.net.URL;
import java.util.*;
import javax.swing.JFileChooser;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
File file = new File("d:\\java\\ch10\\src");
if (!file.exists()) {
file.mkdirs();
} else {
file.delete();
}
}
}
//9 使用File类列出某一个目录下创建日期晚于2017-08-10的文件。
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.Writer;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.swing.JFileChooser;
public class Main {
public static void main(String[] args) throws IOException, ClassNotFoundException {
// TODO Auto-generated method stub
Scanner reader = new Scanner(System.in);
String str = reader.nextLine();
String ss = "2017-08-10 00:00:00";
File file = new File(str);
File[] list = file.listFiles();
for (int i = 0; i < list.length; i++) {
long st = list[i].lastModified();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String sd = sdf.format(new Date(Long.parseLong(String.valueOf(st))));
if (ss.compareTo(sd) <= 0) {
System.out.println(list[i] + sd);
}
}
}
}
file_java
最新推荐文章于 2020-11-22 08:49:02 发布