java - 在用户对象 Java Jackson 或 Gson 的一侧将有序的 JSON 字符串构建到 LinkedHashMap 如何？

Question

在对象 Java jackson 或 Gson 中将有序的 JSON 字符串构建到 LinkedHashMap 如何？？？ 但我希望它按插入键的顺序排列，就像这样。

public class User {

private String user
private String role;

Map<String,String > myLinkedHashMap =  new LinkedHashMap<String, String>();

public void setUser(String user) {
    this.user = user;
}

public void setRole(String role) {
    this.role = role;
}

public String getUser() {
    return user;
}

public String getRole() {
    return role;
}
 ...
}

主要

 string json= "[    {    "user": "Tom",    "role": "READER",   
 "myLinkedHashMap": {
        "1": "first",
        "2": "second",
        "3": "third"   }  } ]";

         output=getUserFromJsonString(json);

  public ClaimDoc getUserFromJsonString(String claimDoc) throws
 IOException {
         ObjectMapper mapper = new ObjectMapper();
         return mapper.readValue(claimDoc, ClaimDoc.class);
     }

输出是

  [
    {
    "user": "Tom",
    "role": "READER",
    "myLinkedHashMap": {
        "3": "third"
        "1": "first",
        "2": "second"

   }
  }
 ]

但我想按插入的顺序，像这样:

   [
    {
    "user": "Tom",
    "role": "READER",
    "myLinkedHashMap": {
        "1": "first",
        "2": "second",
        "3": "third"
   }
  }
 ]

Answer 1

在 User 类而不只是 Map 使用 LinkedHashMap 它会起作用

LinkedHashMap<String,String > myLinkedHashMap =  new LinkedHashMap<String, String>();