，并添加到StringBuilder的

Question

private void readIncomingMessage() { 
    try { 
     StringBuilder builder = new StringBuilder(); 
     InputStream is = socket.getInputStream(); 
     int length = 1024; 
     byte[] array = new byte[length]; 
     int n = 0; 

     while ((n = is.read(array, n, 100)) != -1) { 
      builder.append(new String(array)); 

      if (checkIfComplete(builder.toString())) { 
       buildListItems(builder.toString(), null); 
       builder = new StringBuilder(); 
      } 
     } 

    } catch (IOException e) { 
     Log.e("TCPclient", "Something went wrong while reading the socket"); 
    } 
} 

嗨，

我想读每100个字节块流，这些字节转换为字符串，比看看是否有适合的字符串一定的条件。

但是，当我调试时，我看到该构建器的计数为3072.
而且我看到一个像（text，，，，，，，text，，，，，，text）
我该如何将文本添加到stringbuilder中？

THX :)

private void readIncomingMessage() { 
    try { 
     StringBuilder builder = new StringBuilder(); 
     InputStream is = socket.getInputStream(); 
     int length = 100; 
     byte[] array = new byte[length]; 
     int n = 0; 

     while ((n = is.read(array, 0, length)) != -1) { 
      builder.append(new String(array, 0, n)); 

      if (checkIfComplete(builder.toString())) { 
       buildListItems(builder.toString(), null); 
       builder = new StringBuilder(); 
      } 
     } 

    } catch (IOException e) { 
     Log.e("TCPclient", "Something went wrong while reading the socket"); 
    } 
} 

该解决方案并获得成功对我来说。 此解决方案的任何缺点？

Answer 1

2个问题：

1. 你需要转换的字节字符串时使用'n'值。具体来说，使用此String构造函数String(byte[] bytes, int offset, int length)
2. 将字节转换为任意边界上的字符串时（如您所做的那样），可能会损坏多字节字符。如果'is'和从中读取字符，你最好把InputStreamReader放在最上面。

Answer 2

欲了解更多信息，请阅读文档read(byte[], int, int)，new String(byte[])和new String(byte[], int, int)

ň将持有读取最后一次读操作的字节数 - 而不是总数读取的字节。如果您只想一次读取多达100个字节，则不需要1024字节的数组，而是100个字节。从字节数组创建字符串时，它会使用整个数组（即使只有一半可以通过读取来填充），除非您告诉它要使用的数组的哪一部分。像这样的东西应该工作，但仍有改进，你可以做：

private void readIncomingMessage() { 
    try { 
    StringBuilder builder = new StringBuilder(); 
    InputStream is = socket.getInputStream(); 
    int length = 100; 
    byte[] array = new byte[length]; 
    int pos = 0; 
    int n = 0; 

    while (pos != length && ((n = is.read(array, pos, length-pos)) != -1)) { 
     builder.append(new String(array, pos, n)); 
     pos += n; 
     if (checkIfComplete(builder.toString())) { 
      buildListItems(builder.toString(), null); 
      builder = new StringBuilder(); 
      pos = 0; 
     } 
    } 

} catch (IOException e) { 
    Log.e("TCPclient", "Something went wrong while reading the socket"); 
} 

}