Java写入文件以及读取文件

import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class TestFileWriterReader {
public static void main(String[] args) throws IOException {
String file="F:/stream.txt";
String charSet="UTF-8";
//写字符转换成字节流
FileOutputStream fileWriter=new FileOutputStream(file);
OutputStreamWriter writer=new OutputStreamWriter(fileWriter, charSet);
try {
writer.write("测试输入字符串1");
} catch (Exception e) {
// TODO: handle exception
}finally{
writer.close();
}
//读取字节转换到字符
FileInputStream fileInputStream=new FileInputStream(file);
InputStreamReader reader=new InputStreamReader(fileInputStream, charSet);
StringBuilder builder=new StringBuilder();
char [] buf=new char[64];
int count=0;
try {
while ((count = reader.read(buf)) != -1) {
builder.append(buf,0,count);
}
} catch (Exception e) {
// TODO: handle exception
}finally{
reader.close();
}
System.out.println(builder.toString());
}
}