[英]parsing json with Gson java
使用Gson解析json時遇到問題。 這是我的代碼:
Gson gson = new GsonBuilder().create();
String json = gson.toJson(myMap.values());
MyClass clazz = gson.fromJson(json, MyClass.class);
System.out.println(clazz.toString());
但是我得到了下一個錯誤(我也嘗試了新的TypeToken,但是錯誤是相同的):
com.google.gson.JsonParseException: The JsonDeserializer MapTypeAdapter failed to deserialized json object /*here is json object*/
Caused by: java.lang.IllegalArgumentException: Map objects need to be parameterized unless you use a custom serializer. Use the com.google.gson.reflect.TypeToken to extract the ParameterizedType.
at com.google.gson.TypeInfoMap.<init>(TypeInfoMap.java:45)
at com.google.gson.DefaultTypeAdapters$MapTypeAdapter.deserialize(DefaultTypeAdapters.java:605)
at com.google.gson.DefaultTypeAdapters$MapTypeAdapter.deserialize(DefaultTypeAdapters.java:573)
at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:50)
這是獲取的json字符串,它是有效的(但可能是我應該刪除“ items”子字符串?):
["{\n
\"items\":
[
\n {
\n \"MyClass_type_var1\": {
\n \"field1\": \"val1\",
\n \"field2\": \"val2\",
\n \"field3\": [
\n {
\n \"subfield1\": subval
\n }
\n ]
\n }
\n },
\n \"MyClass_type_var2\": {
\n \"field1\": \"val1\",
\n \"field2\": \"val2\",
\n \"field3\": [
\n {
\n \"subfield1\": subval
\n }
\n ]
\n }
\n },
\n \"MyClass_type_var3\": {
\n \"field1\": \"val1\",
\n \"field2\": \"val2\",
\n \"field3\": [
\n {
\n \"subfield1\": subval
\n }
\n ]
\n }
\n },
etc...... may I haven't closed brackets correctly, but they are correct :)
}
]
"]
我將不勝感激。
public final class MyClass extends GenericJson {
private String field1;
private String field2;
private java.util.List<AClass> field3; // has subfield1
//getters and setters
}
單行json:
["{\n \"items\": [ \n { \n \"MyClass\": { \n \"field1\": \"val1\", \n \"field2\": \"val2\", \n \"field2\": [ \n { \n \"subfield1\": subval \n } \n ] \n } \n }, \n \"MyClass\": { \n \"field1\": \"val1\", \n \"field2\": \"val2\", \n \"field2\": [ \n { \n \"subfield1\": subval \n } \n ] \n } \n }, \n \"MyClass\": {\n \"field1\":\"val1\", \n \"field2\": \"val2\", \n \"field2\": [ \n { \n \"subfield1\": subval \n } \n ] \n } \n }, } ] "]
在這里,我嘗試使用jackon,但沒有幫助。 查看該問題的答案(使用我自己的解析器)。
嘗試這樣的事情:
我的課:
import java.util.List;
public class MyClass {
public List<Item> items;
public static class Item{
public List<innerData> MyClass_type_var1;
public List<innerData> MyClass_type_var2;
public List<innerData> MyClass_type_var3;
public static class innerData{
public String field1;
public String field2;
public List<String> field3;
}
}
}
MyClass cls = new Gson().fromJSon(json, MyClass.class);
希望這會指導您正確的方向:-)
編輯:
嘗試這個
public class NewClass{
public List<MyClass> items;
}
NewClass cls = new Gson().fromJSon(json, NewClass.class);
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