StringBuilder转换String 中文乱码

public String convertStreamToString(InputStream is) {
 
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "/n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
BufferedReader reader = new BufferedReader(new InputStreamReader(is));

改成：BufferedReader reader = new BufferedReader(new InputStreamReader(is),"UTF-8");

关键看那个流从哪边来的
举个例子
比如你这个流是从磁盘上某个txt文件读取的
1、如果这个文件以ANSI的编码格式保存的，那么
new InputStreamReader(is,"GBK")
2、如果这个文件以UTF-8的形式保存的，那么
new InputStreamReader(is,"UTF-8")
如果是……