FileReader读取中文乱码

log4j2写的日志到文件中，已经配置了UTF-8编码

```
appender.dailyrollingfile.layout.charset=UTF-8
```
log文件中确实是UTF-8编码
但在用FileReader读取到html页面的时候出现乱码

```java
    response.setContentType("text/html;charset=UTF-8");

    FileReader fr = new FileReader(logPath);
    BufferedReader br = new BufferedReader(fr);
    String line = br.readLine();
    if(line!=null){
    	out.println(line);
    }
```

是因为FileReader在读取时采用系统默认的字符集GBK

两种解决方案:

一、
```java
line=new String(line.getBytes(System.getProperty("file.encoding")),"UTF-8"); //将系统默认编码转为UTF-8
```

二、
```java
    FileInputStream fis = new FileInputStream(logPath);
    InputStreamReader fr = new InputStreamReader(fis,"UTF-8"); //改用UTF-8读取文件
    BufferedReader br = new BufferedReader(fr);

```