Java读取文件，出现中文乱码，GB2312文件读取乱码

读取编码为gb2312格式的文件，出现中文乱码

普通文件读取，通常使用FileReader

try (FileReader fileReader = new FileReader(sampleFile);
     BufferedReader br = new BufferedReader(fileReader);) {
    String line = null;
    StringBuilder sb = new StringBuilder();
    while ((line = br.readLine()) != null) {
        sb.append(line);//中文乱码，文件格式是gb2312
    }
}

　　

 解决方案：

用InputStreamReader包装一层，并指定字符集

try(FileInputStream fis = new FileInputStream(sampleFile);
     InputStreamReader isr = new InputStreamReader(fis, "gb2312");
     BufferedReader br = new BufferedReader(isr);){
    String line = null;
    StringBuilder sb = new StringBuilder();
    while ((line = br.readLine()) != null) {
        sb.append(line);//不是乱码 https://www.cnblogs.com/tomcatandjerry
    }
}