Gson解析时间时报com.google.gson.JsonSyntaxException异常问题的解决-蒲公英云

Gson解析时间时报com.google.gson.JsonSyntaxException异常问题的解决

示例代码

@Test
    public void testJsonToJavaBean() {
        String jsonString = "{\"bir\":1619330606019,\"id\":1,\"salary\":10000.0,\"userName\":\"userName--1\"}";
        Gson gson = getGson();
        DemoOne demoOne = gson.fromJson(jsonString, DemoOne.class);
        System.out.println("json字符窜转为java bean");
        System.out.println(demoOne);
    }

报错信息

com.google.gson.JsonSyntaxException: 1619330606019

at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:87)
at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:75)
at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:46)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory1. r e a d ( R e f l e c t i v e T y p e A d a p t e r F a c t o r y . j a v a : 131 ) a t c o m . g o o g l e . g s o n . i n t e r n a l . b i n d . R e f l e c t i v e T y p e A d a p t e r F a c t o r y 1.read(ReflectiveTypeAdapterFactory.java:131) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory1.read(ReflectiveTypeAdapterFactory.java:131)atcom.google.gson.internal.bind.ReflectiveTypeAdapterFactoryAdapter.read(ReflectiveTypeAdapterFactory.java:222)

解决方案

运行到gson解析JSON时报如上异常，代码没变，为什么在不同服务器上运行的结果就不一样了呢，后来各种搜索，才了解到Gson不同服务器在解析时间格式不一样，了解到这一点后，只需要在Gson实例化指定解析的格式即可，将

Gson gson=new Gson();
替换为 
Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();

最终代码实现

对应测试的javabean

@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
public class DemoOne {
    private Integer id;
    private String userName;
    @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date bir;
    private Double salary;
}

测试代码

@Test
    public void testJavaBeanToJson() {
        DemoOne demoOne = new DemoOne().setBir(new Date()).setId(1).setSalary(10000.0).setUserName("张三");
        Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create(); //按照 yyyy-MM-dd HH:mm:ss格式化。Gson
        /**
         * 如果gson不进行时间格式化处理可能会报错
         * com.google.gson.JsonSyntaxException
         */
//        Gson gson = new Gson();
        String jsonString = gson.toJson(demoOne);
        System.out.println("java bean转为json格式字符窜");
        System.out.println(jsonString);
    }
    /*
    控制台打印:
     java bean转为json格式字符窜
{"id":1,"userName":"张三","bir":"2021-04-25 15:40:31","salary":10000.0}
     */
    /**
     * json格式字符窜转为 java bean
     */
    @Test
    public void testJsonToJavaBean() {
        String jsonString = "{\"id\":1,\"userName\":\"张三\",\"bir\":\"2021-04-25 15:36:49\",\"salary\":10000.0}";
        Gson gson = getGson();
        DemoOne demoOne = gson.fromJson(jsonString, DemoOne.class);
        System.out.println("json字符窜转为java bean");
        System.out.println(demoOne);
    }
/*
json字符窜转为java bean
DemoOne(id=1, userName=张三, bir=Sun Apr 25 15:36:49 CST 2021, salary=10000.0)
 */