package com.io;import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.LinkedList;/**
* 缓冲读入文件
* @author Administrator
*
*/
public class BufferedInputFile { public static String read(String filename) throws IOException{
//reading input by lines:
BufferedReader in = new BufferedReader(new FileReader(filename));
String s;
StringBuilder sb= new StringBuilder(); while((s=in.readLine())!=null){
sb.append(s+"\n");
}
in.close();
return sb.toString();
} //test1,打开一个文本文件,每次读取一行内容,将每行作为一个string读入,并将该string对象存入linklist中,逆序打印linklist
public static void printLinkList(String fileName) throws IOException{
BufferedReader in = new BufferedReader(new FileReader("C:/Users/Administrator/Desktop/exec.txt"));
String string;
LinkedList<String> list = new LinkedList<String>();
while((string=in.readLine())!=null){
list.add(string);
}
/*for(int i=list.size();i>=0;i--){
System.out.println(list.get(i));
}*/
java.util.ListIterator<String> item = list.listIterator(list.size()); while(item.hasPrevious()){
System.out.println(item.previous());
} while(item.hasNext()){
System.out.println(item.next());
} /**
* 结果:
* 4-->4-->4:4:4:ghdgml11
3-->3-->3:3:3:flypiger
2-->2-->2:2:2:ghdgml11
1-->1-->1:1:1:flypiger
*/ } public static void main(String[] args) throws IOException {
//System.out.println(read("C:/Users/Administrator/Desktop/exec.txt"));
printLinkList("C:/Users/Administrator/Desktop/exec.txt");
}
}
不要问为什么,代码诠释一切
package com.io;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;
/**
* 基本的io
* @author Administrator
*
*/
public class BasicFileOutput { public static String file = "C:/Users/Administrator/Desktop/exec.txt";
public static String file1 = "C:/Users/Administrator/Desktop/exe.txt";
public static void main(String[] args) throws IOException {
//使用BufferedReader缓冲读入流,使用StringReader包装一个BufferedInputFile.read方法读取的字符串文件流
System.out.println(BufferedInputFile.read(file));
BufferedReader in = new BufferedReader(new StringReader(BufferedInputFile.read(file)));
//FileWriter可以写数据的对象,用BufferedWriter缓冲流包装提升性能,再用PrintWriter包装提升格式
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(file1)));
int lineCount = 1;
String string;
while((string=in.readLine())!=null){
out.println(lineCount++ +": "+string);
}
out.flush();
out.close();
in.close();
System.out.println(BufferedInputFile.read(file1));
}
}
package com.io;import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;/**
* 读取二进制文件
* @author Administrator
*
*/
public class BinaryFile { public static byte[] read(File file) throws IOException{
BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(file));
byte[] data = new byte[inputStream.available()]; inputStream.read(data);
inputStream.close(); return data; }
public static byte[] read(String file) throws IOException{
return read(new File(file).getAbsoluteFile());
}
}
package com.io;import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
/**
* 格式化的内存输出
* @author Administrator
*
*/
public class FormattedMemoryInput { public static void main(String[] args) throws IOException {
DataInputStream in= new DataInputStream(new ByteArrayInputStream(BufferedInputFile.read("C:/Users/Administrator/Desktop/exec.txt").getBytes()));
//available用来查询还有多少可供存取的字符
while(in.available()!=0){
System.out.println(in.readByte());
}
}
}
package com.io;import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;/**
* 用GZIP进行压缩,有空总结常用流的包装
* @author Administrator
*
*/
public class GZIPcompress {
/**压缩/解压缩 常用流,可根据实例替换
* ZipOutputStream
* ZipInputStream
* GZipOutputStream
* GZipInputStream
* @param args
* @throws IOException
*/ public static void main(String[] args) throws IOException {
if(args.length==0){
System.out.println(
"Usage: \nGZIPcompress file\n"+
"\tUsers GZIP compression to compress "+
"the file to test.gz"
);
BufferedReader in = new BufferedReader(new FileReader("C:/Users/Administrator/Desktop/exec.txt"));
//后缀名可以是.gz .gzip.zip
BufferedOutputStream out= new BufferedOutputStream(new GZIPOutputStream(new FileOutputStream("C:/Users/Administrator/Desktop/test.gz")));
System.out.println("Writing file*********************************"); int c;
while((c=in.read())!=-1){
out.write(c);
}
out.close();
in.close();
System.out.println("reading file*********************************"); BufferedReader in2 = new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream("C:/Users/Administrator/Desktop/test.gz"))));
String string;
while((string=in2.readLine())!=null){
System.out.println(string);
}
}
}
}
package com.io;import java.io.IOException;
import java.io.StringReader;/**
* 从内存中读取,没什么好说的
* @author Administrator
*
*/
public class MemoryInput { public static void main(String[] args) throws IOException {
StringReader in = new StringReader(BufferedInputFile.read("C:/Users/Administrator/Desktop/exec.txt"));
//SringReader读取的int类型的,所以要转换成char打印
int c;
while((c=in.read())!=-1){
System.out.println((char)c);
}
}
}
