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[英]Spring Jackson - Unrecognized field \“response\” not marked as ignorable at
[英]jackson java Unrecognized field not marked as ignorable
錯誤代碼:
org.codehaus.jackson.map.exc.UnrecognizedPropertyException:
Unrecognized field "id" (Class JacksonTester$Student), not
marked as ignorable
at [Source: [B@40334c25; line: 2, column: 8]
(through reference chain: Student["id"])
我有以下 JSON 文件:
{
"id": "0",
"title": "0",
"externalId": "0",
"externalLink": "0",
"sourceApplication": "0",
"content": "0",
"summaryContent": "0",
"publishedDate": "0",
"harvestDate": "0",
"languageId": "0",
"regionId": "0",
"postStatus": "0"
}
我的代碼是
JacksonTester.java:
public class JacksonTester {
public static void main(String args[]) {
ObjectMapper mapper = new ObjectMapper();
// map json to student
try {
byte[] jsonData = Files.readAllBytes(Paths.get("output_json.txt"));
Student student = mapper.readValue(jsonData, Student.class);
System.out.println(student);
} catch (Exception e) {
e.printStackTrace();
}
}
static class Student {
String id;
String title;
String externalId;
String externalLink;
String sourceApplication;
String content;
String summaryContent;
String publishedDate;
String harvestDate;
String languageId;
String regionId;
String postStatus;
public Student() {
}
}
}
你需要要么有這些字段或接受這些字段作為參數的構造制定者(+ approriate注釋或-parameters
從Java 8和傑克遜模塊參數名稱模塊):
public static class Student {
...
String postStatus;
public setPostStatus(postStatus) {
this.postStatus = postStatus;
}
...
}
Jackson 無法訪問 Student 的字段。
為 Student 實現公共 getter 和 setter 並且它有效。
我解決了這個問題,它工作正常。 這是我的代碼。
**MainClass.java:**
public class MainClass {
public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
String jsonStr = "{\r\n" + " \"id\": \"168\",\r\n" + " \"title\": \"Mr\",\r\n"
+ " \"externalId\": \"247518\",\r\n" + " \"externalLink\": \"www.gmail.com\",\r\n"
+ " \"sourceApplication\": \"adsense\",\r\n" + " \"content\": \"hmtl\",\r\n"
+ " \"summaryContent\": \"null\",\r\n" + " \"publishedDate\": \"12122018\",\r\n"
+ " \"harvestDate\": \"12122018\",\r\n" + " \"languageId\": \"3\",\r\n" + " \"regionId\": \"45\",\r\n"
+ " \"postStatus\": \"1\"\r\n" + "}";
ObjectMapper mapper = new ObjectMapper();
MyPojo details = mapper.readValue(jsonStr, MyPojo.class);
System.out.println("Value for getId is: " + details.getId());
System.out.println("Value for getSourceApplication is: " + details.getSourceApplication());
System.out.println("Value for getExternalId is: " + details.getPublishedDate());
System.out.println("Value for getExternalLink is: " + details.getExternalLink());
} }
**MyPojo.class**
public class MyPojo {
private String content;
private String id;
private String sourceApplication;
private String title;
private String postStatus;
private String publishedDate;
private String summaryContent;
private String harvestDate;
private String languageId;
private String externalId;
private String regionId;
private String externalLink;
public String getContent() {
return content;
}
public String getId() {
return id;
}
public String getSourceApplication() {
return sourceApplication;
}
public String getTitle() {
return title;
}
public String getPostStatus() {
return postStatus;
}
public String getPublishedDate() {
return publishedDate;
}
public String getSummaryContent() {
return summaryContent;
}
public String getHarvestDate() {
return harvestDate;
}
public String getLanguageId() {
return languageId;
}
public String getExternalId() {
return externalId;
}
public String getRegionId() {
return regionId;
}
public String getExternalLink() {
return externalLink;
} }
**RESULT:**
Value for getId is: 168
Value for getSourceApplication is: adsense
Value for getExternalId is: 12122018
Value for getExternalLink is: www.gmail.com
注意必須將 json 中的字段更改為以小寫字母開頭。 JSON 更改的原因是 Jackson bean 序列化將反映在類上,當它看到 getXyz() 和 setXyz() 方法時,會將它們映射到 Json 文件名稱“xyz”(而不是“Xyz”)。我認為有幾種方法可以覆蓋這種行為,一種是使用 Jackson 注釋之一。
您可以簡單地將private
變量修改為public
,而不是創建這么多公共 getter
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