字节流转换为字符流

//将字节流转换为字符流
public String streamtoString(InputStream inputStream,String charset){
//inputStream。。获取到的数据；；；charset。。。编码
try {
InputStreamReader inputStreamReader=new InputStreamReader(inputStream,charset);
BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
String s=null;
StringBuilder builder=new StringBuilder();
while((s=bufferedReader.readLine())!=null){
builder.append(s);
}
return builder.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}