字符串（字节数组）以字节数组

Question

我需要从字符串转换为相同的字节数组：

String data = request.getParameter("data"); 

byte[] dataByte = new byte[]{}; 

data = -60,-33,-10,-119,126,114,-61,-31,55,-102,-35,-72,114,77,115,72,79,-117,102,64,98,-20,-75,27,58,-59,86,-97,106,19,-112,-79,100,105,115,107,100,105,114,101,99,116,111,114,95,115,97,102,101,46,99,111,110,102,105,103,49,52,53,53,83,112,97,99,101,115,83,116,111,114,101,114,117,99,111,110,116,101,110,116,85,114,108,61,115,116,111,114,101,58,47,47,50,48,49,50,47,49,48,47,49,47,57,47,53,50,47,57,100,48,48,48,48,55,97,45,54,50,48,48,45,52,54,52,102,45,97,48,48,97,45,50,52,97,100,52,98,100,55,50,53,53,48,46,98,105,110,124,109,105,109,101,116,121,112,101,61,97,112,112,108,105,99,97,116,105,111,110,47,111,99,116,101,116,45,115,116,114,101,97,109,124,115,105,122,101,61,52,53,57,53,49,124,101,110,99,111,100,105,110,103,61,85,84,70,45,56,124,108,111,99,97,108,101,61,114,117,95,124,105,100,61,52,49,48,56,101,57,100,100,50,100,56,45,56,102,54,97,45,52,54,55,54,45,56,53,99,57,45,50,52,54,102,55,57,57,55,101,102,48,99,77,111,110,32,79,99,116,32,48,49,32,48,57,58,53,50,58,49,53,32,78,79,86,83,84,32,50,48,49,50,119,111,114,107,115,112,97,99,101,97,100,109,105,110,97,100,109,105,110 

Answer 1

String[] dataArray = data.split(",") 

然后，您可以遍历该dataArray然后创建byte[]出来。

String dataArray[] = data.split(","); 
    byte[] bytes = new byte[dataArray.length]; 
    int count = 0; 
    for(String str : dataArray) 
    { 
     bytes[count++] = Byte.parseByte(str); 
    } 

如果你知道字符编码，那么你可以使用#String.getBytes

Answer 2

String.getBytes(String charsetName)会给你一个字节数组。你将不得不小心。指定你的字符编码。

Answer 3

使用StringTokenizer或String.split（）方法并将每个子字符串解析为字节。注意编码。

Answer 4

使用String.split()和遍历结果数组：

String[] array = data.split(","); 
byte[] dataByte = new byte[ array.length ]; 
for (int i=0 ; i<array.length ; i++) { dataByte[ i ] = Byte.parseByte(array[ i ]); } 

干杯，

Answer 5

可以使用String#getBytes()方法用于此目的： -

String data = request.getParameter("data"); 
byte[] dataByte = data.getBytes() 

它采用了default character encoding。您可以指定你自己的..

见String#getBytes(Charset)

或者你也可以拆分之后使用Byte#parseByte(String)方法在字符串数组的每个值： -

String data = request.getParameter("data"); 
    String arr[] = data.split(","); 
    byte[] newarr = new byte[arr.length]; 

    int count = 0; 
    for (String val: arr) { 
     newarr[count++] = Byte.parseByte(val); 
     System.out.println(Byte.parseByte(val) + ", "); 
    }