Java实现对文本中的英文字母进行大小写转换

package org.kimiwok.test;


import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.Reader;
import java.io.Writer;


public class CapShift {
public static void main(String[] args) throws Exception{
toUpper("E:/ab.txt");
toLower("E:/BA.txt");
}
public static void toLower(String file) throws Exception{


Reader myReader = new FileReader(file);
Reader myBufferedReader = new BufferedReader(myReader);

CharArrayWriter  tempStream = new CharArrayWriter();  
int i = -1;
do {
tempStream.write(i);
i = myBufferedReader.read();
if(i >= 65 && i <= 90){
i += 32;
}
}while(i != -1);
myBufferedReader.close();
Writer myWriter = new FileWriter(file);
tempStream.writeTo(myWriter);
tempStream.flush();
tempStream.close();
myWriter.close();

}
public static void toUpper(String file) throws Exception{


Reader myReader = new FileReader(file);
Reader myBufferedReader = new BufferedReader(myReader);

CharArrayWriter  tempStream = new CharArrayWriter();  
int i = -1;
do {
tempStream.write(i);
i = myBufferedReader.read();
if(i >= 97 && i <= 122){
i -= 32;
}
}while(i != -1);
myBufferedReader.close();
Writer myWriter = new FileWriter(file);
tempStream.writeTo(myWriter);
tempStream.close();
myWriter.close();

}
}

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