因爲LocalDateTime默認使用的iso 時間格式：所以返回json的時候時間會出現T
/**
* The ISO date-time formatter that formats or parses a date-time without
* an offset, such as '2011-12-03T10:15:30'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended offset date-time format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_DATE}
* <li>The letter 'T'. Parsing is case insensitive.
* <li>The {@link #ISO_LOCAL_TIME}
* </ul>
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_LOCAL_DATE_TIME;
static {
ISO_LOCAL_DATE_TIME = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_DATE)
.appendLiteral('T')
.append(ISO_LOCAL_TIME)
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
解決辦法：
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
import org.codehaus.jackson.annotate.JsonValue;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
/**
* @Title: LocalDateTimeSerializerConfig
* @Description:
* @Auther:wangli
* @Version: 1.0
* @create 2019-08-22 15:23
*/
@Configuration
public class LocalDateTimeSerializerConfig {
//方法 一
@Bean
public LocalDateTimeSerializer localDateTimeDeserializer() {
return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
return builder -> builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer());
}
//方法 二
/* @Bean(name = "mapperObject")
public ObjectMapper getObjectMapper() {
ObjectMapper om = new ObjectMapper();
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
om.registerModule(javaTimeModule);
return om;
}*/
}
1. 說明
對於@RequestBody註解，Springboot默認使用Jackson實現json字符串和java對象之間的轉換（序列化和反序列化）；也可進行修改使用阿里的fastjson（本文不介紹），Jackson不支持LocalDateTime與格式yyyy-MM-dd HH:mm:ss之間的轉換，需要自定義轉換。
對於@RequestParam註解，需要自定義轉換器。
2. 格式化@RequestBody時間
a) 方法1
直接在類成員變量上加註解進行轉換（注意時區），只對單個類有效。LocalDate、LocalTime類似。
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
private LocalDateTime time;
b) 方法2(推薦)
定製Jackson時間序列化和反序列化方式，添加對LocalDateTime、LocalDate、LocalTime的支持。
- //引入第3方jar包，可能以後Jackson更新版本會默認支持LocalDateTime
- compile group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310', version: '2.9.4'
/**
* @author: bys319.com
*/
@Configuration
public class JacksonConfig {
@Bean
public ObjectMapper getObjectMapper() {
ObjectMapper om = new ObjectMapper();
om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
om.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);
JavaTimeModule javaTimeModule = new JavaTimeModule();
//日期序列化
javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
//日期反序列化
javaTimeModule.addDeserializer(LocalDateTime.class,new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
javaTimeModule.addDeserializer(LocalDate.class,new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
javaTimeModule.addDeserializer(LocalTime.class,new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
om.registerModule(javaTimeModule);
return om;
}
}
3. 格式化@RequestParam時間
a) 方法1
直接對參數加註解進行轉換。
@GetMapping(path = "date")
public String world(@RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") LocalDateTime datetime,
@RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate date,
@RequestParam @DateTimeFormat(pattern = "HH:mm:ss") LocalTime time) {
return "test datetime";
}
b) 方法2(推薦)
分別定義處理LocalDateTime、LocalDate、LocalTime的轉換器。
/**
* @author: bys319.com
*/
@Configuration
public class DateConverterConfig {
//不要聽信idea的自動提示將代碼轉化成lambda方式，會報錯
@Bean
public Converter<String, LocalDateTime> LocalDateTimeConvert() {
return new Converter<String, LocalDateTime>() {
@Override
public LocalDateTime convert(String source) {
DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime date = null;
try {
date = LocalDateTime.parse(source, df);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
};
}
@Bean
public Converter<String, LocalDate> LocalDateConvert() {
return new Converter<String, LocalDate>() {
@Override
public LocalDate convert(String source) {
DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDate date = null;
try {
date = LocalDate.parse(source, df);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
};
}
@Bean
public Converter<String, LocalTime> LocalTimeConvert() {
return new Converter<String, LocalTime>() {
@Override
public LocalTime convert(String source) {
DateTimeFormatter df = DateTimeFormatter.ofPattern("HH:mm:ss");
LocalTime date = null;
try {
date = LocalTime.parse(source, df);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
};
}
}