json转bean对象工具

com.fasterxml.jackson 可以忽略大小写，类内部可以使用List

com.fasterxml.jackson.core
jackson-databind
2.9.8

public static T xsonToBean(String jsonString,Class beanClass) throws JsonProcessingException {
//Json字符串转为java对象
ObjectMapper ob =new ObjectMapper();
//忽略未定义字段
ob.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
//json转bean时忽略大小写
ob.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);
T bean = ob.readValue(jsonString, beanClass);
return bean;
}
public static List xsonToList(String jsonString,Class beanClass) throws JsonProcessingException {
//Json字符串转为java对象
ObjectMapper ob =new ObjectMapper();
//忽略未定义字段
ob.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
//json转bean时忽略大小写
ob.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);
List list = ob.readValue(jsonString, new TypeReference>() {});
return list;
}

gson,不能直接忽略大小写，可以通过 @SerializedName(“custom_naming”) private final String someField; 或者UpperCamelCase
内部有List时可以用

com.google.code.gson
gson
2.8.5



public static T gsonToBean(String jsonString, Class beanClass) {
Gson gson = new Gson();
T bean = gson.fromJson(jsonString, beanClass);
return bean;
}

public static List gsonToBeanList(String jsonString, Class clazz) {
Gson gson = new Gson();
Type type = new ParameterizedTypeImpl(clazz);
List list = gson.fromJson(jsonString, type);
return list;
}
public class ParameterizedTypeImpl implements ParameterizedType {
Class clazz;

public ParameterizedTypeImpl(Class clz) {
clazz = clz;
}


public Type[] getActualTypeArguments() {
return new Type[]{clazz};
}


public Type getRawType() {
return List.class;
}


public Type getOwnerType() {
return null;
}
}


net.sf.json 不能忽略大小写,而且类内部有List时，序列化有问题，需要借助单独定义Map参数解决

net.sf.json-lib
json-lib
2.4
jdk15

public static List jsonToBeanList(String jsonString, Class beanClass) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
JSONObject jsonObject;
T bean;
int size = jsonArray.size();
List list = new ArrayList(size);

for (int i = 0; i < size; i++) {
jsonObject = jsonArray.getJSONObject(i);
bean = (T) JSONObject.toBean(jsonObject, beanClass);
list.add(bean);
}
return list;
}
/*
从一个JSON 对象字符格式中得到一个java对象

@param jsonString
@param beanCalss
@return
*/

@SuppressWarnings(“unchecked”)
public static T jsonToBean(String jsonString, Class beanCalss) {

JSONObject jsonObject = JSONObject.fromObject(jsonString);
T bean = (T) JSONObject.toBean(jsonObject, beanCalss);

return bean;
}