java - 使用键值对解析字符串响应并将它们添加到映射或数组中

Question

我收到一个响应，其中包含由 分隔的键值对:

USER: 0xbb492894B403BF08e9181e42B07f76814b10FEdc
IP: 10.0.2.6
NETMASK: 255.255.0.0
SUPERNODE: tlcsupernode.ddns.net
PORT: 5000
COMMUNITY: tlcnet
PSK: mysecret
MAC: 00:02:ff:00:02:06

为了解析和存储它们，我使用以下代码:

Map<String, String> map = new HashMap<String, String>();
String[] parts = response.trim().split(":");

for (int i = 0; i < parts.length; i += 2) {
    map.put(parts[i], parts[i + 1]);
}

for (String s : map.keySet()) {
    System.out.println(s + " is " + map.get(s));
    Log.d("Testing", "  "+s + " is " + map.get(s));
}

但是由于 MAC 有多个 : 分隔符，我无法正确解析它。

我从以下链接获得了帮助: Split string into key-value pairs

Answer 1

使用 Java 8 流，您可以将其作为一个内衬来完成。

String resp = "USER: 0xbb492894B403BF08e9181e42B07f76814b10FEdc\n" + 
        "IP: 10.0.2.6\n" + 
        "NETMASK: 255.255.0.0\n" + 
        "SUPERNODE: tlcsupernode.ddns.net\n" + 
        "PORT: 5000\n" + 
        "COMMUNITY: tlcnet\n" + 
        "PSK: mysecret\n" + 
        "MAC: 00:02:ff:00:02:06";

Map<String, String> map = Arrays.asList(resp.split("\\R")).stream().map(x -> x.split(":", 2)).collect(Collectors.toMap(x -> x[0], x -> x[1].trim()));

for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(String.format("Key: %s, Value: %s", entry.getKey(), entry.getValue()));
}

打印，

Key: SUPERNODE, Value: tlcsupernode.ddns.net
Key: NETMASK, Value: 255.255.0.0
Key: COMMUNITY, Value: tlcnet
Key: PORT, Value: 5000
Key: IP, Value: 10.0.2.6
Key: PSK, Value: mysecret
Key: USER, Value: 0xbb492894B403BF08e9181e42B07f76814b10FEdc
Key: MAC, Value: 00:02:ff:00:02:06

这里，\\R(匹配任何类型的换行符)用换行符拆分你的响应字符串，使用 : 进一步拆分，第二个参数为 2 以拆分字符串获取最多两个值，最后使用 Collectors.toMap

收集为 Map

编辑:

对于旧版本的 Java，您可以使用简单的 for 循环，

String resp = "USER: 0xbb492894B403BF08e9181e42B07f76814b10FEdc\n" + "IP: 10.0.2.6\n" + "NETMASK: 255.255.0.0\n"
        + "SUPERNODE: tlcsupernode.ddns.net\n" + "PORT: 5000\n" + "COMMUNITY: tlcnet\n" + "PSK: mysecret\n"
        + "MAC: 00:02:ff:00:02:06";
Map<String, String> map = new HashMap<>();

for (String line : resp.split("\\R")) {
    String[] keyValue = line.split(":", 2);
    map.put(keyValue[0], keyValue[1]);
}

for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(String.format("Key: %s, Value: %s", entry.getKey(), entry.getValue()));
}