Question

我有一个字符串缓冲区（Payload），如下所示：

"SQN":922,"Node_ID":"cc000000000000000000000000000002","Energy":"5.00","Power":"1.80","Sign":"6d226becaf5a5b..."

现在我想按如下方式自定义它：

String part_1 = "{9 spaces}922{3 spaces}5.00{3 spaces}1.80"
String part_2 = "6d226becaf5a5b..."

这样做的最佳解决方案是什么？

我按照Martin P提议的那样尝试了这个：

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import org.json.JSONArray.*;
import org.json.JSONException;
import org.json.JSONObject.*;
import org.json.JSONString;

String input = "{\"SQN\":922,\"Node_ID\":\"cc000000000000000000000000000002\",\"Energy\":\"5.00\",\"Power\":\"1.80\",\"Sign\":\"6d226becaf5a5b...\"}";

        JSONParser obj = ((Object) new JSONParser().parse(input)).getAsJsonObject();
        String sqnString = jsonObjectToString(obj, "SQN");
        String energyString = jsonObjectToString(obj, "Energy");
        String powerString = jsonObjectToString(obj, "Power");
        String signString = jsonObjectToString(obj, "Sign");

        StringBuilder sb = new StringBuilder();
        sb.append("{whatever we need}").append(sqnString).append("{whatever we need}").append(energyString).append("{whatever we need}").append(powerString);
        String part_1 = sb.toString();
        String part_2 = signString;

        System.out.println(part_1);
        System.out.println(part_2);

但是，getAsJsonObject()和jsonObjectToString(obj, "SQN")未定义。

Answer 1

看起来你可以把它解析为Json。

我用Gson做到了这一点。这是指向maven的链接：Gson maven

请注意我将您的字符串包装在大括号（{}）中以便稍后将其解析为json

示例代码：

String input = "{\"SQN\":922,\"Node_ID\":\"cc000000000000000000000000000002\",\"Energy\":\"5.00\",\"Power\":\"1.80\",\"Sign\":\"6d226becaf5a5b...\"}";

    JsonObject obj = new JsonParser().parse(input).getAsJsonObject();
    String sqnString = jsonObjectToString(obj, "SQN");
    String energyString = jsonObjectToString(obj, "Energy");
    String powerString = jsonObjectToString(obj, "Power");
    String signString = jsonObjectToString(obj, "Sign");

    StringBuilder sb = new StringBuilder();
    sb.append("{whatever you need}").append(sqnString).append("{whatever you need here}").append(energyString).append("{something else}").append(powerString);
    String part_1 = sb.toString();
    String part_2 = signString;

    System.out.println(part_1);
    System.out.println(part_2);
}

private static String jsonObjectToString(JsonObject obj, String name) {
    return obj.getAsJsonPrimitive(name).getAsString();
}

结果输出：

{无论你需要什么} 922 {无论你需要什么} 5.00 {其他} 1.80

... 6d226becaf5a5b

通过JSON解析器拆分和自定义Java中的字符串缓冲区？

1 个答案: