gson TypeAdapter 和FieldNamingStrategy，SerializedName实现属性名称的设置别名
代码语言：javascript复制package com.example.core.mydemo.TypeAdapter;
import com.google.gson.FieldNamingStrategy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.annotations.SerializedName;
import java.lang.reflect.Field;
/**
* 打印输出结果：
jsonStr={"Result":null,"id":1,"data":null}
bean=result:null id:1 data:null
bean2=result:-1 id:1 data:null
jsonStr2={"Result":-1,"id":1,"DATA":"Empty"}
*/
public class UserBean {
@SerializedName("Result")
public Integer result;
public Long id;
public String data;
@Override
public String toString() {
return "result:" result " id:" id " data:" data;
}
public static void main(String[] args) {
// Gson gson = new Gson();
//serializeNulls输出null
Gson gson = new GsonBuilder().serializeNulls().create();
UserBean userBean = new UserBean();
userBean.setId(1);
// userBean.setData(null);
// userBean.setResult(null);
String jsonStr = gson.toJson(userBean);
System.out.println("jsonStr=" jsonStr);
UserBean bean = gson.fromJson(jsonStr,UserBean.class);
System.out.println("bean=" bean.toString());
Gson gson2 = new GsonBuilder()
.registerTypeAdapter(String.class,new StringAdapter())
.registerTypeAdapter(Integer.class,new IntegerAdapter())
.registerTypeAdapter(int.class,new IntegerAdapter())
.setFieldNamingStrategy(new FirstLowerCaseStrategy())
.create();
UserBean bean2 = gson2.fromJson(jsonStr,UserBean.class);
System.out.println("bean2=" bean2.toString());
System.out.println("jsonStr2=" gson2.toJson(bean2));
}
public int getResult() {
return result;
}
public void setResult(Integer result) {
this.result = result;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public static class FirstLowerCaseStrategy implements FieldNamingStrategy {
@Override
public String translateName(Field f) {
// System.out.println("name=" f.getName());
if("data".equalsIgnoreCase(f.getName())){
// return f.getName().toLowerCase();
// System.out.println("upper=" f.getName().toUpperCase());
return f.getName().toUpperCase();
}else{
return f.getName();
}
}
}
}
