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[英]How do I get the value of Arrays ArrayOfObjects in Mongodb-java driver
[英]Getting a Mongodb ArrayOfObjects value from POJO class with Java driver
I am facing an issue(getting Null Value) while getting the Mongodb value from the ArrayOfObjects and My POJO class is like below:I have created separate POJOS for Each Object.Can anyone help me how to fetch the value of Email Systems.Bob.系統。 我的文檔:
"Email Systems" : [
{
"Bob" : {
"System" : "Bob",
"result" : true
}
},
{
"Wild" : {
"System" : "Wild",
"result" : true
}
},
{
"CRaft" : {
"System" : "Craft",
"result" : false
}
}
]
我的 POJO Class:
public class Bob{
@JsonProperty("System")
public String system;
public String result;
}
public class Wild{
@JsonProperty("System")
public String system;
public String result;
}
public class CRaft{
@JsonProperty("System")
public String system;
public String result;
}
public class EmailSystem{
@JsonProperty("Bob")
public Bob bob;
@JsonProperty("Wild")
public Wild wild;
@JsonProperty("CRaft")
public CRaft cRaft;
}
public class Root{
@JsonProperty("EmailSystems")
public List<EmailSystem> emailSystems;
}
首先將 JSON 數據填充到您的 POJO 中,然后嘗試從中檢索,然后您將不會獲得 null 值。
確保在所有 POJO 中都有 GETTER/SETTER。 “結果”字段也是boolean 。 但你可以用字符串 map with("")
ObjectMapper obj = new ObjectMapper();
Root root = obj.readValue("jsonstring",Root.class);
they you can use getter to get the data.
POM 依賴:--
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.1</version>
</dependency>
您的 JSON 現在應該是:---(根據 POJO 類)
{
"root": {
"EmailSystems": [
{
"Bob": {
"System": "Bob",
"result": "true"
}
},
{
"Wild": {
"System": "Wild",
"result": "true"
}
},
{
"CRaft": {
"System": "Craft",
"result": "false"
}
}
]
}
}
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