关于转换流

q348281373 2016-08-15 07:26:32

为什么会输出乱码啊

package trans;



import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;



public class transDemo {

	public static void main(String[] args) throws IOException, FileNotFoundException {

		File file=new File("h:\\IOTest\\test.txt");

		OutputStreamWriter osw=new OutputStreamWriter(new FileOutputStream(file),"utf-8");

		osw.write("哈哈哈");

		

	

		InputStreamReader isr=new InputStreamReader(new FileInputStream(file),"utf-8");

		char[] buf=new char[3];

		int len=isr.read(buf);

		System.out.println(new String(buf));

		isr.close();

		osw.close();

	}

}

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NewMoons 2016-08-15

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输出流应该先关闭，否则输入流拿不到文件操作权。

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
public class transDemo {
    public static void main(String[] args) throws IOException, FileNotFoundException {
        File file=new File("e:\\test.txt");
        OutputStreamWriter osw=new OutputStreamWriter(new FileOutputStream(file),"utf-8");
        osw.write("哈哈哈");
        osw.close();//输出流不关闭，导致输入流拿不到读文件的控制权。
     
        InputStreamReader isr=new InputStreamReader(new FileInputStream(file),"utf-8");
        char[] buf=new char[3];
        int len=isr.read(buf);
        System.out.println(new String(buf));
        isr.close();
    }
}