IO之字节流与字符流，为什么两种方法输出都乱码了？

Question

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.Reader;

public class ReaderDemo {

/**

* 使用字符流读取文本文件

*/

public static void stringReader(){

File f = new File("E:\\测试用例.txt");

try {

//构造一个字符输入流对象

Reader ri = new FileReader(f);

char[] cs = new char[20];

int len = -1;

StringBuffer sb = new StringBuffer();

while ((len = ri.read(cs))!=-1){

sb.append(new String(cs,0,len));

}

//关闭流

ri.close();

System.out.println(sb);

} catch (FileNotFoundException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}

}

/**

* 使用字节流读取文本文件

* @param args

*/

public static void byteReader(){

File f = new File("E:\\测试用例.txt");

try {

InputStream is = new FileInputStream(f);

byte[] bytes = new byte[1024];

int len = -1;

StringBuffer sb = new StringBuffer();

while ((len = is.read(bytes))!=-1){

sb.append(new String(bytes,0,len));

}

is.close();

System.out.println(sb);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

//byteReader();

stringReader();

}

}

Answer 1

记得采纳欧1、你检查一下你文件的保存格式是UTF8吗？    2、你看看String(byte[] bytes,      int offset,      int length,      Charset charset)你理解这个构造函数吗？new String(bytes,0,len，“utf-8”)