LocalDateTime返回的格式为 2019-10-11T20:20:45，处理json返回时间中带有T的情况/// 接收LocalDateTime参数， 推荐的 两个都能解决

因为LocalDateTime默认使用的iso 时间格式：所以返回json的时候时间会出现T

 

  /**
     * The ISO date-time formatter that formats or parses a date-time without
     * an offset, such as '2011-12-03T10:15:30'.
     * 

     * This returns an immutable formatter capable of formatting and parsing
     * the ISO-8601 extended offset date-time format.
     * The format consists of:
     * 

     * 
The {@link #ISO_LOCAL_DATE}
     * 
The letter 'T'. Parsing is case insensitive.
     * 
The {@link #ISO_LOCAL_TIME}
     * 
     * 

     * 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);
    }

解决办法：

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. 说明

对于@RequestBody注解，Springboot默认使用Jackson实现json字符串和java对象之间的转换（序列化和反序列化）；也可进行修改使用阿里的fastjson（本文不介绍），Jackson不支持LocalDateTime与格式yyyy-MM-dd HH:mm:ss之间的转换，需要自定义转换。

对于@RequestParam注解，需要自定义转换器。

2. 格式化@RequestBody时间

a) 方法1

直接在类成员变量上加注解进行转换（注意时区），只对单个类有效。LocalDate、LocalTime类似。

@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(推荐)

定制Jackson时间序列化和反序列化方式，添加对LocalDateTime、LocalDate、LocalTime的支持。

1. //引入第3方jar包，可能以后Jackson更新版本会默认支持LocalDateTime
2. 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时间

a) 方法1

直接对参数加注解进行转换。

@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(推荐)

分别定义处理LocalDateTime、LocalDate、LocalTime的转换器。

/**
* @author: bys319.com
*/
@Configuration
public class DateConverterConfig {

//不要听信idea的自动提示将代码转化成lambda方式，会报错
@Bean
public Converter LocalDateTimeConvert() {
return new Converter() {
@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 LocalDateConvert() {
return new Converter() {
@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 LocalTimeConvert() {
return new Converter() {
@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;
}
};
}

}