java （字符流、转换流）

短命女 2022-08-17 13:28 171阅读 0赞

import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.File;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.FileReader;  
import java.io.IOException;  
import java.io.InputStreamReader;  
import java.io.LineNumberReader;  
import java.io.OutputStreamWriter;  
import java.util.ArrayList;  
import java.util.List;  
  
  
  
  
//1、（字符流、转换流）完成下面功能：  
//事先在准备好一个test.txt的文本文件，该文件具有多行。  
//如：  
//test.txt  
//床前明月光  
//疑是地上霜  
//举头望明月  
//低头思故乡  
//利用字节流+转换流读入这个文件，然后按照行的顺序，  
//写到test2.txt文件中，例如：  
//test2.txt  
//低头思故乡  
//举头望明月  
//疑是地上霜  
//床前明月光  
public class Test1   
\{  
public static void main(String\[\] args) throws IOException   
\{  
write1();  //从控制台输入；  
write2();  
  
\}  
    private static void write1() throws IOException  
    \{  
    File file = new File("d:\\\\a\\\\text.txt");  
if(!file.exists())  
\{  
file.createNewFile();  
\}  
//将字节流转换为字符流；  
BufferedReader is = new BufferedReader(new InputStreamReader(System.in));  
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));  
String line = null;  
System.out.println("input：");  
while((line = is.readLine()) != null)  
\{  
if(line.equals("over"))  
break;  
bw.write(line);  
bw.newLine();  
bw.flush();  
\}  
is.close();  
bw.close();  
    \}  
      
    private static void write2() throws IOException  
    \{  
    File file = new File("d:\\\\a\\\\text.txt");  
    File file2 = new File("d:\\\\a\\\\text2.txt");  
if(!file2.exists())  
\{  
file2.createNewFile();  
\}  
LineNumberReader lnr = new LineNumberReader(new FileReader(file));  
BufferedWriter bw2 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file2)));  
StringBuffer sb = new StringBuffer();  
String line = null;  
while((line = lnr.readLine()) != null)  
\{  
sb.append(line).append("？");  
\}  
  
String\[\] str = new String\[lnr.getLineNumber()\];  
sb.deleteCharAt(sb.lastIndexOf("？"));  
str = sb.toString().split("？");   
for(int i=lnr.getLineNumber()-1; i>=0; i--)  
\{  
bw2.write(str\[i\]);  
bw2.newLine();  
bw2.flush();  
\}  
lnr.close();  
bw2.close();  
    \}  
\}