ZonedDateTime通過傑克遜往返產生不平等ZonedDateTime

Question

鑑於以下單元測試：

@Test 
public void zonedDateTimeCorrectlyRestoresItself() { 

    // construct a new instance of ZonedDateTime 
    ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Z")); 
    // offset = {ZoneOffset@3820} "Z" 
    // zone = {ZoneOffset@3820} "Z" 

    String converted = now.toString(); 

    // restore an instance of ZonedDateTime from String 
    ZonedDateTime restored = ZonedDateTime.parse(converted); 
    // offset = {ZoneOffset@3820} "Z" 
    // zone = {ZoneOffset@3820} "Z" 

    assertThat(now).isEqualTo(restored); // ALWAYS succeeds 
} 

@Test 
public void jacksonIncorrectlyRestoresZonedDateTime() { 

    ObjectMapper objectMapper = new ObjectMapper(); 
    objectMapper.findAndRegisterModules(); 
    objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE); 

    // construct a new instance of ZonedDateTime 
    ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Z")); 
    // offset = {ZoneOffset@3820} "Z" 
    // zone = {ZoneOffset@3820} "Z" 


    String converted = objectMapper.writeValueAsString(now); 

    // restore an instance of ZonedDateTime from String 
    ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class); 
    // offset = {ZoneOffset@3820} "Z" 
    // zone = {ZoneOffset@3821} "UTC" 

    assertThat(now).isEqualTo(restored); // NEVER succeeds 
} 

而且這種解決方法：

@Test 
public void usingDifferentComparisonStrategySucceeds() throws Exception { 

    ObjectMapper objectMapper = new ObjectMapper(); 
    objectMapper.findAndRegisterModules(); 
    objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE); 

    // construct a new instance of ZonedDateTime 
    ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Z")); 
    // offset = {ZoneOffset@3820} "Z" 
    // zone = {ZoneOffset@3820} "Z" 

    String converted = objectMapper.writeValueAsString(now); 

    // restore an instance of ZonedDateTime from String 
    ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class); 
    // offset = {ZoneOffset@3820} "Z" 
    // zone = {ZoneOffset@3821} "UTC" 

    // the comparison succeeds when a different comparison strategy is used 
    // checks whether the instants in time are equal, not the java objects 
    assertThat(now.isEqual(restored)).isTrue(); 
} 

我想我試圖找出爲什麼國內傑克遜只是沒有按」請撥打ZonedDateTime.parse()？就我個人而言，我認爲這是傑克遜的一個缺陷，但我還沒有足夠的信心在沒有反饋的情況下爲它開啓一個問題。

Answer 1

引述維基百科ISO 8601：

如果時間是UTC，沒有空格的時間後直接添加Z。 Z是零UTC抵消的區域指示符。因此"09:30 UTC"表示爲"09:30Z"或"0930Z"。 "14:45:15 UTC"將是"14:45:15Z"或"144515Z"。

UTC時間也被稱爲祖魯時間，因爲祖魯族是Z.

北約拼音字母詞

Z不是一個區。 UTC是區域，然後代表使用格式化的字符串中的Z。

千萬不要使用ZoneId.of("Z")。這是不對的。