Question

java byte 数组里存的是ascii码，怎么转成字符串

String str ="";
try {
Socket socket = new Socket("192.168.0.168", 9999);// 向本机的4700端口发出客户请求
PrintWriter os = new PrintWriter(socket.getOutputStream());
DataInputStream reader = new DataInputStream(socket.getInputStream());
String readline;
readline = "ok"; // 从系统标准输入读入一字符串
int bytesRead = 0;
while (!readline.equals("end")) { os.println(readline); os.flush(); byte [] aa = new byte[reader.available()];
reader.read(aa);
readline = "ok"; } os.close(); // 关闭Socket输出流
reader.close(); // 关闭Socket输入流
socket.close(); // 关闭Socket
} catch (Exception e) {
System.out.println("Error" + e); // 出错，则打印出错信息
}
怎么将aa 转换成string字符串，控制台打印出来，str=new String(aa);这样转的话打印出来的都是乱码

Answer 1

byte[] b=new byte[]{65,66,67,68};//字节数组
        String s=new String(b,"ascii");//第二个参数指定编码方式
        System.out.print(s);

Answer 2

new String(byteArray);
String(byte[] bytes)
Constructs a new String by decoding the specified array of bytes using the platform's default charset.

换成这个构造函数：

String(byte[] bytes, String charsetName)
Constructs a new String by decoding the specified array of bytes using the specified charset.

Answer 3

如果有中文的话，改成这个：new String(aa, "GB2312");告诉它转成GB2312格式的内容。

Answer 4

str=new String(aa,,"ISO-8859-1");