Java 中有很多 JSON 相关的类库，项目中也频繁的使用 Jackson, fastjson, gson 等等类库。不过这些类库在反序列化 JSON 字符串到 Object 并且进行重命名字段的方法都不太一致，这里就列一下做个参考。

假设有原始字符串

String originStr = "{\"familyName\":\"Ein\",\"age\":20,\"salary\":1000.0}";

反序列化到类 Employee 上。

GSON

类定义

@Data
public class EmployeeGson {

    @SerializedName(value = "fullname", alternate = {"Name", "familyName"})
    private String name;
    private int age;
    @SerializedName("salary")
    private float wage;
}

测试方法

@Test
public void testRenameFieldGson() {
	String originStr = "{\"familyName\":\"Ein\",\"age\":20,\"salary\":1000.0}";
	EmployeeGson employee = new Gson().fromJson(originStr, EmployeeGson.class);
	System.out.println(employee);
}

Fastjson

类

@Data
public class EmployeeFastjson {
    @JSONField(name = "familyName")
    private String name;
    private int age;
    @JSONField(name = "salary")
    private float wage;
}

测试方法

@Test
public void testRenameFieldFastjson() {
	String originStr = "{\"familyName\":\"Ein\",\"age\":20,\"salary\":1000.0}";
	EmployeeFastjson employee = JSON.parseObject(originStr, EmployeeFastjson.class);
	System.out.println(employee);
}

Jackson

@Data
public class EmployeeJackson {

    @JsonProperty("familyName")
    private String name;
    private int age;
    @JsonProperty("salary")
    private float wage;

}

测试方法

@Test
public void testRenameFieldJackson() throws IOException {
	String originStr = "{\"familyName\":\"Ein\",\"age\":20,\"salary\":1000.0}";
	EmployeeJackson employeeJackson = new ObjectMapper()
			.readValue(originStr, EmployeeJackson.class);
	System.out.println(employeeJackson);
}