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

曾经终败给现在 2023-09-30 19:52 19阅读 0赞

## 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)
     */