BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String result = "";
        String line = "";
        while((line = reader.readLine())!= null){
          result = result+ line;
        }
        System.out.println(result);

private static String changeInputeStream(InputStream inputStream,String encode) {
    //通常叫做内存流，写在内存中的
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    byte[] data = new byte[1024];
    int len = 0;
    String result = "";
    if(inputStream != null){
      try {
        while((len = inputStream.read(data))!=-1){
          outputStream.write(data, 0, len);
        }
        //result是在服务器端设置的doPost函数中的
        result = new String(outputStream.toByteArray(),encode);
        outputStream.flush();
        outputStream.close();
        inputStream.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    return result;
  }

StringBuffer buffer = new StringBuffer();
    InputStreamReader reader =new InputStreamReader(request.getInputStream(),"utf-8");
    char[] requestchar = new char[5];
    if(reader != null){
      System.out.println("默认编码："+reader.getEncoding());//默认编码：UTF8
    }
    //buffer reader.readLine()
    while((temp = reader.read(requestchar))!=-1){
      buffer.append(requestchar, 0, temp);
      System.out.println(buffer.toString());
    }
    String result = buffer.toString();

class Kaoshi
{public static void main(String[] args){
 Scanner in=new Scanner(System.in);
 int score=0;              //分数;
 StringBuffer answer=new StringBuffer();//存放用户答案，动态字符串;
 String result="ACDD";         //正确答案;
try{                    
 FileReader file=new FileReader("Test.txt");   //打开文件;
 BufferedReader intw=new BufferedReader(file);  //缓冲流，按行读;
 String s=null;            
 while((s=intw.readLine())!=null){       //判断不为空;
  if(!s.startsWith("*")){           
   System.out.println(s); 
  }
  else{
    System.out.println("请输入正确答案:");
     String str=in.next();
     char c= str.charAt(0);//收集答案;
     answer.append(c);
  }
 }
      
 }catch(IOException e){
   e.printStackTrace();
 } 
 for(int i=0;i<result.length();i++){
   if(result.charAt(i)==answer.charAt(i)||
     result.charAt(i)==answer.charAt(i)-32){
    score+=25;
   }

 }
 System.out.println(score);
} 
}