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這篇文章主要介紹了SpringBoot LocalDateTime格式轉換的方法是什么的相關知識，內容詳細易懂，操作簡單快捷，具有一定借鑒價值，相信大家閱讀完這篇SpringBoot LocalDateTime格式轉換的方法是什么文章都會有所收獲，下面我們一起來看看吧。
項目我們經常會有前后端時間轉換的場景，比如：創建時間、更新時間等。一般情況下，前后端使用時間戳或者年月日的格式進行傳遞。
如果后端收到了前端的參數每次都手動轉化為想要的格式，后端每次將數據傳給前端時都手動處理為想要的格式實在是太麻煩了。
要分兩種情景進行配置（根據Content-Type的不同）：
1.application/x-www-form-urlencoded 和 multipart/form-data
本處將此種情況記為：不使用@RequestBody
2.application/json
即：使用@RequestBody的接口
本處將此種情況記為：使用@RequestBody
備注
有人說，可以這樣配置：
spring:
jackson:
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8
serialization:
write-dates-as-timestamps: false
這種配置只適用于Date這種，不適用于LocalDateTime等。
Date序列化/反序列化時都是用的這種格式："2020-08-19T16:30:18.823+00:00"。
配置類
package com.example.config;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.InitBinder;
import java.beans.PropertyEditorSupport;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
@ControllerAdvice
public class LocalDateTimeAdvice {
@InitBinder
protected void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(LocalDateTime.class, new PropertyEditorSupport() {
@Override
public void setAsText(String text) throws IllegalArgumentException {
setValue(LocalDateTime.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
}
});
binder.registerCustomEditor(LocalDate.class, new PropertyEditorSupport() {
@Override
public void setAsText(String text) throws IllegalArgumentException {
setValue(LocalDate.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd")));
}
});
binder.registerCustomEditor(LocalTime.class, new PropertyEditorSupport() {
@Override
public void setAsText(String text) throws IllegalArgumentException {
setValue(LocalTime.parse(text, DateTimeFormatter.ofPattern("HH:mm:ss")));
}
});
}
}Entity
package com.example.business.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import java.time.LocalDateTime;
@Data
@AllArgsConstructor
public class User {
private Long id;
private String userName;
private LocalDateTime createTime;
}Controller
package com.example.business.controller;
import com.example.business.entity.User;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("user")
public class UserController {
@PostMapping("save")
public User save(User user) {
System.out.println("保存用戶：" + user);
return user;
}
}測試
postman訪問：http://localhost:8080/user/save?userName=Tony&createTime=2021-09-16 21:13:21
postman結果：
后端結果：
實現 org.springframework.core.convert.converter.Converter，自定義參數轉換器。
配置類
package com.example.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
@Configuration
public class LocalDateTimeConfig {
@Bean
public Converter<String, LocalDateTime> localDateTimeConverter() {
return new LocalDateTimeConverter();
}
public static class LocalDateTimeConverter implements Converter<String, LocalDateTime> {
@Override
public LocalDateTime convert(String s) {
return LocalDateTime.parse(s, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}
}
}Entity
package com.example.business.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import java.time.LocalDateTime;
@Data
@AllArgsConstructor
public class User {
private Long id;
private String userName;
private LocalDateTime createTime;
}Controller
package com.example.business.controller;
import com.example.business.entity.User;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("user")
public class UserController {
@PostMapping("save")
public User save(User user) {
System.out.println("保存用戶：" + user);
return user;
}
}測試
postman訪問：http://localhost:8080/user/save?userName=Tony&createTime=2021-09-16 21:13:21
postman結果：
后端結果
本方法只配置ObjectMapper即可，Entity不需要加@JsonFormat。
配置類
package com.knife.example.config;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.DateDeserializers;
import com.fasterxml.jackson.databind.ser.std.DateSerializer;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
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 lombok.SneakyThrows;
import org.springframework.boot.autoconfigure.jackson.JacksonProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
@Configuration
public class JacksonConfig {
@Bean
public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder,
JacksonProperties jacksonProperties) {
ObjectMapper objectMapper = builder.build();
// 把“忽略重復的模塊注冊”禁用，否則下面的注冊不生效
objectMapper.disable(MapperFeature.IGNORE_DUPLICATE_MODULE_REGISTRATIONS);
objectMapper.registerModule(configTimeModule());
// 重新設置為生效，避免被其他地方覆蓋
objectMapper.enable(MapperFeature.IGNORE_DUPLICATE_MODULE_REGISTRATIONS);
return objectMapper;
}
private JavaTimeModule configTimeModule() {
JavaTimeModule javaTimeModule = new JavaTimeModule();
String localDateTimeFormat = "yyyy-MM-dd HH:mm:ss";
String localDateFormat = "yyyy-MM-dd";
String localTimeFormat = "HH:mm:ss";
String dateFormat = "yyyy-MM-dd HH:mm:ss";
// 序列化
javaTimeModule.addSerializer(
LocalDateTime.class,
new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(localDateTimeFormat)));
javaTimeModule.addSerializer(
LocalDate.class,
new LocalDateSerializer(DateTimeFormatter.ofPattern(localDateFormat)));
javaTimeModule.addSerializer(
LocalTime.class,
new LocalTimeSerializer(DateTimeFormatter.ofPattern(localTimeFormat)));
javaTimeModule.addSerializer(
Date.class,
new DateSerializer(false, new SimpleDateFormat(dateFormat)));
// 反序列化
javaTimeModule.addDeserializer(
LocalDateTime.class,
new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(localDateTimeFormat)));
javaTimeModule.addDeserializer(
LocalDate.class,
new LocalDateDeserializer(DateTimeFormatter.ofPattern(localDateFormat)));
javaTimeModule.addDeserializer(
LocalTime.class,
new LocalTimeDeserializer(DateTimeFormatter.ofPattern(localTimeFormat)));
javaTimeModule.addDeserializer(Date.class, new DateDeserializers.DateDeserializer(){
@SneakyThrows
@Override
public Date deserialize(JsonParser jsonParser, DeserializationContext dc){
String text = jsonParser.getText().trim();
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
return sdf.parse(text);
}
});
return javaTimeModule;
}
}Entity
package com.example.business.entity;
import lombok.Data;
import java.time.LocalDateTime;
@Data
public class User {
private Long id;
private String userName;
private LocalDateTime createTime;
}Controller
package com.example.business.controller;
import com.example.business.entity.User;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("user")
public class UserController {
@PostMapping("save")
public User save(@RequestBody User user) {
System.out.println("保存用戶：" + user);
return user;
}
}測試
后端結果
保存用戶：User(id=null, userName=Tony, createTime=2021-09-16T21:13:21)
本方法需要配置ObjectMapper，Entity也需要加@JsonFormat。
配置類
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
import org.springframework.boot.autoconfigure.jackson.JacksonProperties;
import org.springframework.boot.jackson.JsonComponent;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
@Configuration
public class JacksonConfig {
@Bean
public ObjectMapper serializingObjectMapper(Jackson2ObjectMapperBuilder builder,
JacksonProperties jacksonProperties) {
ObjectMapper objectMapper = builder.build();
// 把“忽略重復的模塊注冊”禁用，否則下面的注冊不生效
objectMapper.disable(MapperFeature.IGNORE_DUPLICATE_MODULE_REGISTRATIONS);
// 自動掃描并注冊相關模塊
objectMapper.findAndRegisterModules();
// 手動注冊相關模塊
// objectMapper.registerModule(new ParameterNamesModule());
// objectMapper.registerModule(new Jdk8Module());
// objectMapper.registerModule(new JavaTimeModule());
// 重新設置為生效，避免被其他地方覆蓋
objectMapper.enable(MapperFeature.IGNORE_DUPLICATE_MODULE_REGISTRATIONS);
return objectMapper;
}
}Entity
package com.example.business.entity;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import java.time.LocalDateTime;
@Data
public class User {
private Long id;
private String userName;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
private LocalDateTime createTime;
}Controller
package com.example.business.controller;
import com.example.business.entity.User;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("user")
public class UserController {
@PostMapping("save")
public User save(@RequestBody User user) {
System.out.println("保存用戶：" + user);
return user;
}
}測試
后端結果
保存用戶：User(id=null, userName=Tony, createTime=2021-09-16T21:13:21)
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
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.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;
@Configuration
public class LocalDateTimeConfig {
private final String localDateTimeFormat = "yyyy-MM-dd HH:mm:ss";
private final String localDateFormat = "yyyy-MM-dd";
private final String localTimeFormat = "HH:mm:ss";
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
return builder -> {
// 反序列化（接收數據）
builder.deserializerByType(LocalDateTime.class,
new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(localDateTimeFormat)));
builder.deserializerByType(LocalDate.class,
new LocalDateDeserializer(DateTimeFormatter.ofPattern(localDateFormat)));
builder.deserializerByType(LocalTime.class,
new LocalTimeDeserializer(DateTimeFormatter.ofPattern(localTimeFormat)));
// 序列化（返回數據）
builder.serializerByType(LocalDateTime.class,
new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(localDateTimeFormat)));
builder.serializerByType(LocalDate.class,
new LocalDateSerializer(DateTimeFormatter.ofPattern(localDateFormat)));
builder.serializerByType(LocalTime.class,
new LocalTimeSerializer(DateTimeFormatter.ofPattern(localTimeFormat)));
};
}
}關于“SpringBoot LocalDateTime格式轉換的方法是什么”這篇文章的內容就介紹到這里，感謝各位的閱讀！相信大家對“SpringBoot LocalDateTime格式轉換的方法是什么”知識都有一定的了解，大家如果還想學習更多知識，歡迎關注億速云行業資訊頻道。
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