Question

将有序JSON字符串构建为对象Java jackson或Gson内部的LinkedHashMap如何？但是我希望按插入键的顺序来执行此操作。

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);
     }

输出为

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

   }
  }
 ]

但是我想要插入的顺序，就像这样：

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

Answer 1

在用户类中，而不仅仅是 Map ，请使用 LinkedHashMap ，它将起作用

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

在用户对象Java Jackson或Gson的一侧将有序JSON字符串构建到LinkedHashMap怎么办？

1 个答案: