Question

我有两个字符串如下：

“activityTypes”：{“activityType”：“COLLECTIONS”}，

“activityTypes”：{“activityType”：“E-DROP”}，

我需要将其转换为 -

“activityTypes”：[{“activityType”：“COLLECTIONS”}]，

“activityTypes”：[{“activityType”：“E-DROP”}]，

上述转换中java的正则表达式是什么？

Answer 1

您可以使用REGEX或处理JSON来获得预期的输出。

假设您要使用Mongodb-java-driver-3.0.1将此代码用于Mongodb

    BasicDBObject myobj = new BasicDBObject();
    BasicDBObject myobj1 = new BasicDBObject().append("activityType", "COLLECTIONS");
    myobj.append("activityTypes", myobj1);
    System.out.println(myobj);
    List<BasicDBObject> myarray = new ArrayList<>();
    myarray.add(myobj1);
    myobj.put("activityTypes", myarray);
    System.out.println(myobj);

这将输出为

{ "activityTypes" : { "activityType" : "COLLECTIONS"}}
{ "activityTypes" : [ { "activityType" : "COLLECTIONS"}]}

Answer 2

可能有更好的方法。

public static void main(String[] args) {
        // TODO code application logic here
        String string1 = "\"activityTypes\": {\"activityType\": \"COLLECTIONS\"} "
                + "\n \"activityTypes\": {\"activityType\": \"E-DROP\"},";

        Scanner input = new Scanner(string1);

        Pattern pattern = Pattern.compile("\\\"activityTypes\\\": \\{[\\s\\S]+?\\}");



        while(input.hasNext())
        {
            Matcher m = pattern.matcher(input.nextLine());
            if(m.find())
            {
                string1 = m.group().replace("{", "{[");                                 
                System.out.println(string1);
            }
            else
            {
                System.out.println("Nothing found!");
            }
        }
        input = new Scanner(string1);
        pattern = Pattern.compile("\\\"activityTypes\\\": \\{\\[[\\s\\S]+?\\}");

         while(input.hasNext())
        {
            Matcher m = pattern.matcher(input.nextLine());
            if(m.find())
            {
                string1 = m.group().replace("}", "]}");                                 
                System.out.println(string1);
            }
            else
            {
                System.out.println("Nothing found!");
            }
        }       
    }

带有通配符的正则表达式

2 个答案: