关于字符串和byte数组在java和ios之间兼容的解决办法

之前在java上写过String转为byte数组的代码，后来在开发iPhone程序的时候，发现也需要把NSString转为byte数组，并且需要达到跟java程序兼容。但是发现java自身的默认编码机制为iso-8859-1，而ios的默认编码机制为utf-8，所以直接编码并不能达到两者兼容的问题。后来查阅相关资料，最后解决了编码兼容的问题，而且中英文都通用。

如下为java代码：

     String str = "你好啊,aBc!";  
    ByteArrayOutputStream baos = new ByteArrayOutputStream();  
    DataOutputStream outputstream = new DataOutputStream(baos);  
    outputstream.writeChars(str);  
      
    byte[] contents = baos.toByteArray();  
    for (int i = 0; i < contents.length; i++) {  
        System.out.println("contents:"+contents[i]);  
    }  

最后打印为：

 contents:79  
contents:96  
contents:89  
contents:125  
contents:85  
contents:74  
contents:0  
contents:44  
contents:0  
contents:97  
contents:0  
contents:66  
contents:0  
contents:99  
contents:0  
contents:33 

ios代码：

     NSString *str = @"你好啊,aBc!";  
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(NSUTF16BigEndianStringEncoding);  
    NSData *data = [str dataUsingEncoding:enc];  
    Byte *byte = (Byte *)[data bytes];  
    for (int i=0 ; i<[data length]; i++) {  
        NSLog(@"byte = %d",byte[i]);  
    }  

最后打印结果为

     2012-07-19 10:07:46.967 encoding[593:f803] byte = 79  
    2012-07-19 10:07:46.969 encoding[593:f803] byte = 96  
    2012-07-19 10:07:46.969 encoding[593:f803] byte = 89  
    2012-07-19 10:07:46.970 encoding[593:f803] byte = 125  
    2012-07-19 10:07:46.970 encoding[593:f803] byte = 85  
    2012-07-19 10:07:46.970 encoding[593:f803] byte = 74  
    2012-07-19 10:07:46.970 encoding[593:f803] byte = 0  
    2012-07-19 10:07:46.971 encoding[593:f803] byte = 44  
    2012-07-19 10:07:46.971 encoding[593:f803] byte = 0  
    2012-07-19 10:07:46.971 encoding[593:f803] byte = 97  
    2012-07-19 10:07:46.971 encoding[593:f803] byte = 0  
    2012-07-19 10:07:46.972 encoding[593:f803] byte = 66  
    2012-07-19 10:07:46.972 encoding[593:f803] byte = 0  
    2012-07-19 10:07:46.972 encoding[593:f803] byte = 99  
    2012-07-19 10:07:46.972 encoding[593:f803] byte = 0  
    2012-07-19 10:07:46.973 encoding[593:f803] byte = 33  

编码一致！点赞

参考文档：http://blog.csdn.net/miemie1320/article/details/7761848