为了解码一系列字节到一个正常的字符串消息，我最终得到了它与UTF-8编码工作与以下代码:

/* Convert a list of UTF-8 numbers to a normal String
 * Usefull for decoding a jms message that is delivered as a sequence of bytes instead of plain text
 */
public String convertUtf8NumbersToString(String[] numbers){
    int length = numbers.length;
    byte[] data = new byte[length];

    for(int i = 0; i< length; i++){
        data[i] = Byte.parseByte(numbers[i]);
    }
    return new String(data, Charset.forName("UTF-8"));
}

将字符串转换为字节[]:

String s = "some text here";
byte[] b = s.getBytes(StandardCharsets.UTF_8);

将字节[]转换为字符串:

byte[] b = {(byte) 99, (byte)97, (byte)116};
String s = new String(b, StandardCharsets.US_ASCII);

当然，您应该使用正确的编码名称。我的示例使用了US-ASCII和UTF-8这两种常用的编码。

String original = "hello world";
byte[] utf8Bytes = original.getBytes("UTF-8");

Charset UTF8_CHARSET = Charset.forName("UTF-8");
String strISO = "{\"name\":\"א\"}";
System.out.println(strISO);
byte[] b = strISO.getBytes();
for (byte c: b) {
    System.out.print("[" + c + "]");
}
String str = new String(b, UTF8_CHARSET);
System.out.println(str);

//query is your json   

 DefaultHttpClient httpClient = new DefaultHttpClient();
 HttpPost postRequest = new HttpPost("http://my.site/test/v1/product/search?qy=");

 StringEntity input = new StringEntity(query, "UTF-8");
 input.setContentType("application/json");
 postRequest.setEntity(input);   
 HttpResponse response=response = httpClient.execute(postRequest);

你可以直接通过String(byte[]， String)构造函数和getBytes(String)方法进行转换。Java通过Charset类公开可用的字符集。JDK文档列出了支持的编码。

90%的情况下，这样的转换是在流上执行的，所以你可以使用Reader/Writer类。您不能在任意字节流上使用String方法进行增量解码——您可能会遇到涉及多字节字符的错误。