Java IO流读取中文文本文件乱码问题，完美解决

package chenlei.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
* 字符流读取中文乱码问题
* @author chenleiz
* @email [e-mail]
*/
public class IODemo02 {

public static void main(String[] args) throws Exception {
String filePath = "f:\\iodemo\\test.txt";

System.out.println(readTxt(filePath));
}

// 读取文件
public static String readTxt(String path) throws Exception {

StringBuilder strb = new StringBuilder("");

InputStream is = new FileInputStream(new File(path));
InputStreamReader isr = new InputStreamReader(is, getCode(path));
BufferedReader br = new BufferedReader(isr);

String str = "";
while (null != (str = br.readLine())) {
strb.append(str);
strb.append("\r\n");
}
br.close();
return strb.toString();
}

// 获取编码格式 gb2312,UTF-16,UTF-8,Unicode,UTF-8
public static String getCode(String path) throws Exception {
InputStream inputStream = new FileInputStream(path);
byte[] head = new byte[3];
inputStream.read(head);
String code = "gb2312"; // 或GBK
if (head[0] == -1 && head[1] == -2)
code = "UTF-16";
else if (head[0] == -2 && head[1] == -1)
code = "Unicode";
else if (head[0] == -17 && head[1] == -69 && head[2] == -65)
code = "UTF-8";
inputStream.close();
return code;
}
}