在Java中阅读行ME

Question

Java ME允许您从InputStream读取一行吗？

Answer 1

这并不像听起来那么微不足道。不幸的是，行可能以'\ r'，'\ n'或'\ r \ n'结尾。以下课程将处理所有这些情况。

public class LineReader{ 
    private Reader in; 
    private int bucket=-1; 
    public LineReader(Reader in){ 
     this.in=in; 
    } 

    public boolean hasLine() throws IOException{ 
     if(bucket!=-1)return true; 
     bucket=in.read(); 
     return bucket!=-1; 
    } 

    //Read a line, removing any /r and /n. Buffers the string 
    public String readLine() throws IOException{ 
     int tmp; 
     StringBuffer out=new StringBuffer(); 
     //Read in data 
     while(true){ 
      //Check the bucket first. If empty read from the input stream 
      if(bucket!=-1){ 
       tmp=bucket; 
       bucket=-1; 
      }else{ 
       tmp=in.read(); 
       if(tmp==-1)break; 
      } 
      //If new line, then discard it. If we get a \r, we need to look ahead so can use bucket 
      if(tmp=='\r'){ 
       int nextChar=in.read(); 
       if(tmp!='\n')bucket=nextChar;//Ignores \r\n, but not \r\r 
       break; 
      }else if(tmp=='\n'){ 
       break; 
      }else{ 
       //Otherwise just append the character 
       out.append((char) tmp); 
      } 
     } 
     return out.toString(); 
    } 
} 

Answer 2

它的确如此。通过循环调用read（）直到找到换行符。