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What is the method for SpringBoot LocalDateTime format conversion?

PHPzforward: 2023-05-15 23:34:101438browse

Introduction

Description

We often have scenes of front-end and back-end time conversion in projects, such as: creating time, update time, etc. Generally, the front and back ends use the timestamp or year, month and day format for transmission.

If the backend receives the front-end parameters and manually converts them into the desired format every time, it would be too troublesome for the backend to manually process the data into the desired format every time it passes the data to the front-end.

Introduction to the solution

It needs to be configured in two scenarios (according to different Content-Type):

1.application/x-www-form-urlencoded and multipart/ form-data

This situation is recorded here as: not using @RequestBody

2.application/json

That is: using the interface of @RequestBody
This situation is recorded as: using @RequestBody

Remarks

Some people say that it can be configured like this:

spring:
jackson:
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT 8
serialization:
write-dates-as-timestamps: false

This configuration is only applicable to Date, not LocalDateTime, etc.
Date serialization/deserialization uses this format: "2020-08-19T16:30:18.823 00:00".

Do not use @RequestBody

Option 1: @ControllerAdvice @InitBinder

Configuration class

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("保存用户：" + user);
        return user;
    }
}

Test

postman visit: http://localhost:8080/user/save? userName=Tony&createTime=2021-09-16 21:13:21