JAVA ASCII码 读入字符串测试

JAVA ASCII码 读入字符串测试

 

 

 

public class RhzfYunTest {

 public static void main(String[] args) {
 
     int lenSize =6;
     byte[] line = (byte[])null;
     byte[] lenBuffer = new byte[lenSize];
     String readLine = null;

     int messageLength;
    
   
   //  lenBuffer[0] = (byte)63;// ?  ascii 是63  48 对应 0    57 对应 9
     lenBuffer[0] = (byte)63;// ?  ascii 是63  48 对应 0    57 对应 9
     lenBuffer[1] = (byte)63;
     lenBuffer[2] = (byte)63;
     lenBuffer[3] = (byte)32;// 32 对应空字符
     lenBuffer[4] = (byte)32;
     lenBuffer[5] = (byte)32;
   
     System.out.println ("Service socketReceiveMsgServe() received messageLength is " + new String(lenBuffer));
  
     messageLength = Integer.valueOf((new String(lenBuffer)).trim()).intValue();
     System.out.println ("messageLength : "+ messageLength);
    
  
 }
    
    
 }

 

运行结果

Service socketReceiveMsgServe() received messageLength is ???  
Exception in thread "main" java.lang.NumberFormatException: For input string: "???"
 at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
 at java.lang.Integer.parseInt(Integer.java:580)
 at java.lang.Integer.valueOf(Integer.java:766)
 at com.idea.rhzf.RhzfYunTest.main(RhzfYunTest.java:25)