我正在使用 spring rest 模板并希望將 JSON 響應解析為相應的 java POJO。每次我得到一個 MismatchedInputException - 無法反序列化超出起始數組令牌的實例。我已經查看了幾個與杰克遜有關的問題，但沒有找到合適的解決方案。我不確定我的 POJO 結構是否正確。首先是相關的JSON：{ "days":[ [ { "day":"2019-04-29", "time":"08:00-09:30", "room":"room1", "name":"lecture1", "lecturer":"prof1", "eventId":332713, "modified":false } ], [ ], [ ], [ { "day":"2019-05-02", "time":"08:00-10:15", "room":"room2", "name":"lecture2", "lecturer":"prof2", "eventId":332714, "modified":false }, { "day":"2019-05-02", "time":"10:45-13:00", "room":"room3", "name":"lecture3", "lecturer":"prof3", "eventId":332721, "modified":false } ], [ ], [ ], [ ] ]}POJO結構：public class Main{ ArrayList<Day> days = new ArrayList<>(); public ArrayList<Day> getDays() { return days; } public void setDays(ArrayList<Day> days) { this.days = days; } public class Day { private String day; private String time; private String room; private String name; private String lecturer; private Integer eventId; private Boolean modified; public Day() { } // Getter and setter of Day Object }}API 對象中的 Rest-Template 方法：public String getInfoByEventsPeriods(String eventIDs) { String url = APIURL + "/info?from="2019-04-29"&to="2019-05-03"&eventId=" + eventIDs; return rest.getForObject(url, String.class); }在主對象中使用 ObjectMapper 進行處理：public Main getLectures(String eventIDs) throws IOException { API api = new API(); ObjectMapper mapper = new ObjectMapper(); return mapper.readValue(api.getInfoByEventsPeriods(eventIDs), Main.class); }
2 回答
哆啦的時光機
TA貢獻1779條經驗 獲得超6個贊
是的，你是對的，反序列化時使用了錯誤的類型。
我不確定，但是您的days數組包含另一個帶有day對象的數組，但是在您的結構中 ArrayList 由 objects 組成day，而不是它們的數組。
正確的 JSON 將是：
{
"days":[
{
"day":"2019-04-29",
"time":"08:00-09:30",
"room":"room1",
"name":"lecture1",
"lecturer":"prof1",
"eventId":332713,
"modified":false
},
{
"day":"2019-05-02",
"time":"08:00-10:15",
"room":"room2",
"name":"lecture2",
"lecturer":"prof2",
"eventId":332714,
"modified":false
},
......
]
}
因此，根據需要修復的內容更改響應結構或 pojo 對象。
如果你需要修改 POJO，你ArrayList必須包含List天數。
蝴蝶不菲
TA貢獻1810條經驗 獲得超4個贊
你能像下面這樣擁有你的 POJO。我嘗試使用您的 JSON 反序列化，并且能夠成功反序列化。
class Day {
private String day;
private String time;
private String room;
private String name;
private String lecturer;
private Integer eventId;
private Boolean modified;
public void setDay(String day) {
this.day = day;
}
public void setTime(String time) {
this.time = time;
}
public void setRoom(String room) {
this.room = room;
}
public void setName(String name) {
this.name = name;
}
public void setLecturer(String lecturer) {
this.lecturer = lecturer;
}
public void setEventId(Integer eventId) {
this.eventId = eventId;
}
public void setModified(Boolean modified) {
this.modified = modified;
}
}
class Main{
private List<List<Day>> days;
public void setDays(List<List<Day>> days) {
this.days = days;
}
}
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