java 使用jackson动态嵌套json字符串到java对象
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Dynamic nested json string to java object using Hymanson
提问by user3324733
i have trouble in parsing json
我在解析 json 时遇到问题
I have a nested json string, i need to convert to java object , the string look like this, i want to ask how to handle this nested dynamic json using Hymanson, how to decode dynamic nested json string
我有一个嵌套的json字符串，我需要转换为java对象，字符串看起来像这样，我想问一下如何使用Hymanson处理这个嵌套的动态json，如何解码动态嵌套的json字符串
{
"resultCode": "0",
"dataObject": [
{
"lastSyncDate": "20140101000000",
"count": 2,
"refType": "ADO",
"update": [
{
"artist": "C",
"albumTitle": "道",
"productTitle": "道",
"thumbnail": "http://w.com/mposter/album/m/VACL00020880A_m.jpg",
"lastSyncDate": "20140425120159",
"refId": "VACL00214522"
},
{
"artist": "楊",
"albumTitle": "學",
"productTitle": "美",
"thumbnail": "http://m.jpg",
"lastSyncDate": "20140324161831",
"refId": "VACP00168673"
}
],
"delete": [ ]
},
{
"lastSyncDate": "20140101000000",
"count": 8,
"refType": "PAT",
"update": [
{
"artist": "方",
"thumbnail": "http://t.com/moov/images/profile/PAT/8/70/00021870_tn_1_s.jpg",
"lastSyncDate": "20140201010203",
"refId": "00021870"
},
{
"artist": "楊",
"lastSyncDate": "20140328120831",
"refId": "00000125"
},
{
"artist": "陳",
"thumbnail": "http://s.jpg",
"lastSyncDate": "20140328185030",
"refId": "00017704"
}
],
"delete": [ ]
},
{
"lastSyncDate": "20140101000000",
"count": 4,
"refType": "PAB",
"update": [
{
"artist": "陳",
"albumTitle": "The Key",
"thumbnail": "http:/m.jpg",
"lastSyncDate": "20140603143528",
"refId": "VAUN00031629A"
},
{
"artist": "何",
"albumTitle": "梁",
"thumbnail": "http://m.jpg",
"lastSyncDate": "20140603143528",
"refId": "VAEA00003170A"
},
{
"artist": "何",
"albumTitle": "艷",
"thumbnail": "http://m.jpg",
"lastSyncDate": "20110603151452",
"refId": "VAEA00003179A"
}
],
"delete": [ ]
},
{
"lastSyncDate": "20140101000000",
"count": 4,
"refType": "PP",
"update": [
{
"chiName": "其",
"engName": "Other",
"lastSyncDate": "20140130010203",
"chiAuthor": "",
"engAuthor": "",
"refId": "PP1000000003"
},
{
"chiName": "演",
"engName": "E演",
"thumbnail": "http://s.jpg",
"lastSyncDate": "20140126010758",
"chiAuthor": "專",
"engAuthor": "Recommended",
"refId": "PP1000000040"
},
{
"chiName": "日本派台歌",
"engName": "Japan New Releases",
"lastSyncDate": "20140126010758",
"chiAuthor": "",
"engAuthor": "",
"refId": "PP1000000057"
},
{
"chiName": "9",
"engName": "9",
"thumbnail": "http://s.jpg",
"lastSyncDate": "20140126010203",
"chiAuthor": "專",
"engAuthor": "Recommended",
"refId": "PP1000000048"
}
],
"delete": [ ]
}
]
}
回答by ipinyol
You onlyneed to reproduce the structure of the jsonusing java class structure. For instance, for your case:
您只需要重现jsonusing java 类结构的结构。例如，对于您的情况：
public class Result {
String resultCode;
List<DataObject> dataObjects;
<GETTERS & SETTERS>
}
public class DataObject {
String lastSyncDate;
int count;
String refType;
List<Update> updates;
List<Delete> deletes;
<GETTERS & SETTERS>
}
public class Update {
String artist;
String albumTitle;
String productTitle;
String thumbnail;
String lastSyncDate;
String refId;
<GETTERS & SETTERS>
}
public class Delete {
String refId;
<GETTERS & SETTERS>
}
I assumed that Delete class only contains the refId. With this structure, you'll be able to map the json to an object of the class Result without any problems doing:
我假设 Delete 类只包含 refId。使用此结构，您将能够将 json 映射到 Result 类的对象，而不会出现任何问题：
byte[] jsonData = <YOUR JSON>
ObjectMapper objectMapper = new ObjectMapper();
Result result = objectMapper.readValue(jsonData, Result.class);
回答by criszhao
Since the field of Update is not fixed, use map instead of the Update class.
由于Update的字段不固定，所以使用map代替Update类。
public class Result {
String resultCode;
List<DataObject> dataObject;
<GETTERS & SETTERS>
}
public class DataObject {
String lastSyncDate;
int count;
String refType;
List<Map<String, String>> update;
List<String> delete;
<GETTERS & SETTERS>
}
Assume that update only contains String values.
假设更新只包含字符串值。
String jsonData = "YOUR JSON";
ObjectMapper objectMapper = new ObjectMapper();
Result result = objectMapper.readValue(jsonData, Result.class);
