fastjson2
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alibaba
fastjson2兼容包作为springboot默认序列化组件，无法默认序列化Date为时间戳
问题描述
简要描述您碰到的问题。 用的fastjson2 兼容包，针对Date类型，直接通过JSON.toJSONString就是默认序列化为时间戳的。
但是通过WebMvcConfigurer 替换springboot默认的jaskson序列化方式的时候，就不生效，直接序列化为yyyy-MM-dd HH:mm:ss 这种形式了 即便在FastJsonConfig设置dateformat= "millis" 也不会生效，请问这种问题该怎么解决呀
环境信息
请填写以下信息：
- JDK信息： 1.8.0
- 版本信息：fastjson 2.0.52
重现步骤
import java.nio.charset.StandardCharsets;
import java.util.List;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MessageConverterWebMvcConfigurer implements WebMvcConfigurer {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
// 定义配置信息
FastJsonConfig config = new FastJsonConfig();
converter.setFastJsonConfig(config);
converter.setDefaultCharset(StandardCharsets.UTF_8);
converters.add(0, converter);
}
}
期待的正确结果
默认序列化为时间错类型(millis)
@VictorZeng fastjson2的JSON.toJSONString，date序列为yyyy-MM-dd HH:mm:ss fastjson1.x的JSON.toJSONString，date序列为mill 下面是测试代码和截图：
- fastjson2的JSON
import com.alibaba.fastjson2.JSON;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
@RequestMapping("/test")
@RestController
public class Issue2850 {
static class TestData {
public TestData() {
}
public TestData(Date showDate) {
this.showDate = showDate;
}
private Date showDate;
public Date getShowDate() {
return showDate;
}
public void setShowDate(Date showDate) {
this.showDate = showDate;
}
@Override
public String toString() {
return "TestData{" +
"showDate=" + showDate +
'}';
}
}
@RequestMapping(path = "/issue2850/v1", produces = "application/json")
public TestData issue2850V1() {
return new TestData(new Date());
}
@RequestMapping(path = "/issue2850/v2", produces = "application/json")
public String issue2850V2() {
return JSON.toJSONString(new TestData(new Date()));
}
}
- fastjson1.的JSON
import com.alibaba.fastjson.JSON;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
/**
* @author: mek
* Date: 2024/8/10
* Time: 15:15
* vx: 250023777
* Description: Issue 2850
* @version: 1.0
*/
@RequestMapping("/test")
@RestController
public class Issue2850 {
static class TestData {
public TestData() {
}
public TestData(Date showDate) {
this.showDate = showDate;
}
private Date showDate;
public Date getShowDate() {
return showDate;
}
public void setShowDate(Date showDate) {
this.showDate = showDate;
}
@Override
public String toString() {
return "TestData{" +
"showDate=" + showDate +
'}';
}
}
@RequestMapping(path = "/issue2850/v1", produces = "application/json")
public TestData issue2850V1() {
return new TestData(new Date());
}
@RequestMapping(path = "/issue2850/v2", produces = "application/json")
public String issue2850V2() {
return JSON.toJSONString(new TestData(new Date()));
}
}
@VictorZeng fastjson2的JSON.toJSONString，date序列为yyyy-MM-dd HH:mm:ss fastjson1.x的JSON.toJSONString，date序列为mill 下面是测试代码和截图：
- fastjson2的JSON
import com.alibaba.fastjson2.JSON; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.Date; @RequestMapping("/test") @RestController public class Issue2850 { static class TestData { public TestData() { } public TestData(Date showDate) { this.showDate = showDate; } private Date showDate; public Date getShowDate() { return showDate; } public void setShowDate(Date showDate) { this.showDate = showDate; } @Override public String toString() { return "TestData{" + "showDate=" + showDate + '}'; } } @RequestMapping(path = "/issue2850/v1", produces = "application/json") public TestData issue2850V1() { return new TestData(new Date()); } @RequestMapping(path = "/issue2850/v2", produces = "application/json") public String issue2850V2() { return JSON.toJSONString(new TestData(new Date())); } }
- fastjson1.的JSON
import com.alibaba.fastjson.JSON; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.Date; /** * @author: mek * Date: 2024/8/10 * Time: 15:15 * vx: 250023777 * Description: Issue 2850 * @version: 1.0 */ @RequestMapping("/test") @RestController public class Issue2850 { static class TestData { public TestData() { } public TestData(Date showDate) { this.showDate = showDate; } private Date showDate; public Date getShowDate() { return showDate; } public void setShowDate(Date showDate) { this.showDate = showDate; } @Override public String toString() { return "TestData{" + "showDate=" + showDate + '}'; } } @RequestMapping(path = "/issue2850/v1", produces = "application/json") public TestData issue2850V1() { return new TestData(new Date()); } @RequestMapping(path = "/issue2850/v2", produces = "application/json") public String issue2850V2() { return JSON.toJSONString(new TestData(new Date())); } }
fastjson配置就是用的提问者发的配置
貌似没有这个bug啊。我本地使用2.0.52兼容包进行测试：
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>2.0.52</version>
</dependency>
并通过WebMvcConfigurer配置了FastJsonConfig，设置DateFormat("millis")，然后测试了下面三种情况都没有问题（2.0.57也没有这个问题）：
@RestController
public static class TestController {
@GetMapping(value = "/issue2850", produces = "application/json")
public Date issue2850() {
// return JSON.toJSONString(new Date());
// return new TestData(new Date());
return new Date();
}
}
@Data
@AllArgsConstructor
public static class TestData{
private Date date;
}
然后试了一下，只有在使用非兼容版fastjson2替换jackson，并且在控制器方法return JSON.toJSONString(new Date())时才会触发提问者的情况，但是这种是合理的，因为在控制器方法return之前Date类型已经被转为yyyy-MM-dd HH:mm:ss字符串了，在响应时MVC的转换器读到只是一个字符串，无法转换成时间戳。这种算是重复序列化了，MvcConfig已经配置了就没必要在控制器再toJSON
