在使用下面这个写法时候UTF-8文件编码 在读取时候出现乱码问题。
File myFile=new File("文件路径");
BufferedReader in = new BufferedReader(new FileReader(myFile));
应该修改为：
BufferedReader in = new BufferedReader( new InputStreamReader( new FileInputStream(myFile), "UTF-8") );
如果使用INSA编码时候 请使用下面文件读取方式：
InputStreamReader reader = new InputStreamReader( new FileInputStream(new File("文件路径")), "gb2312");
下面是我对文件编码的判断方法：
/**
* 上传文件编码判断
* */
public static String get_charset(File file) {
String charset = "GBK";
byte[] first3Bytes = new byte[3];
try {
boolean checked = false;
;
BufferedInputStream bis = new BufferedInputStream(
new FileInputStream(file));
bis.mark(0);
int read = bis.read(first3Bytes, 0, 3);
if (read == -1)
return charset;
if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) {
charset = "UTF-16LE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xFE
&& first3Bytes[1] == (byte) 0xFF) {
charset = "UTF-16BE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xEF
&& first3Bytes[1] == (byte) 0xBB
&& first3Bytes[2] == (byte) 0xBF) {
charset = "UTF-8";
checked = true;
}
bis.reset();
if (!checked) {
// int len = 0;
int loc = 0;
while ((read = bis.read()) != -1) {
loc++;
if (read >= 0xF0)
break;
if (0x80 <= read && read <= 0xBF) // 单独出现BF以下的，也算是GBK
break;
if (0xC0 <= read && read <= 0xDF) {
read = bis.read();
if (0x80 <= read && read <= 0xBF) // 双字节 (0xC0 - 0xDF)
// (0x80
// - 0xBF),也可能在GB编码内
continue;
else
break;
} else if (0xE0 <= read && read <= 0xEF) {// 也有可能出错，但是几率较小
read = bis.read();
if (0x80 <= read && read <= 0xBF) {
read = bis.read();
if (0x80 <= read && read <= 0xBF) {
charset = "UTF-8";
break;
} else
break;
} else
break;
}
}
}
bis.close();
} catch (Exception e) {
e.printStackTrace();
}
return charset;
}
调用时候判断编码方式UTF-8 或是 INSA编码：
BufferedReader br = null;
if (charset == "GBK") {
InputStreamReader reader = new InputStreamReader(
new FileInputStream(new File(filepath)), "gb2312");
br = new BufferedReader(reader);
}
if (charset == "UTF-8") {
br = new BufferedReader(new InputStreamReader(
new FileInputStream(filepath), "UTF-8"));
}