使用spring框架将Java对象中的顺序保留到json
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我创建了一个Java Spring MVC Web应用程序,它提供了简单的静态服务.
我有这样的对象类.
public class CreateEventWrapper {
private String Topic;
private String SubscriptionReference;
private Date UtcTime;
private List<Message> Messages;
...
}
public class Message {
private List<Source> Source;
...
}
public class Source {
private String Name;
private String Value;
...
}
控制器:
...
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping(produces = "application/json")
class EventController {
@RequestMapping(value = "/event", method = RequestMethod.POST)
public ResponseEntity<CreateEventWrapper> CreateEvent(@RequestBody CreateEventWrapper eventWrapper) {
return new ResponseEntity<CreateEventWrapper>(eventWrapper, HttpStatus.OK);
}
}
我有使用Postman上传到服务器的json格式文件.
上载功能正常.
{
"topic":"Face",
"subscriptionReference":"http:\\abc",
"utcTime":"2016-10-20T19:00:00Z",
"messages":[{
"source":[{"name":"VideoSource","value":"[1]123.avi"},
{"name":"AnalyticEngine","value":"FacialRecognition"}]
}]
}
我希望格式与类中的对象顺序相同
诸如主题,subscriptionReference,utcTime,orderm,消息之类的东西.
但是我得到了带有消息,subscriptionReference,utcTime,主题的输出.
{
"messages": [
{
"source": [
{
"name": "VideoSource",
"value": "[1]123.avi"
},
{
"name": "AnalyticEngine",
"value": "FacialRecognition"
}
]
}
],
"subscriptionReference": "http:\abc",
"utcTime": 1476990000000,
"topic": "Face"
}
是否可以像类对象顺序一样具有特定顺序?
附上我的spring config和porm.xml以供参考.
rest.servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<mvc:annotation-driven />
<mvc:default-servlet-handler/>
<!-- Activates annotation-based bean configuration -->
<context:annotation-config />
<!-- Scans for application @Components to deploy -->
<context:component-scan base-package="org.itri.ccma.paas.service.event.webservice" />
</beans>
porm.xml
...
<!-- Json lib -->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-hibernate4</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.6.1</version>
</dependency>
<!-- jackson -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.4.2</version>
</dependency>
<!-- Springframework -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
...
解决方法:
你应该试试这个
//lower cases since it affects the json output not the class field names
@JsonPropertyOrder({ "topic", "subscriptionReference", "utcTime", "messages" })
public class CreateEventWrapper {
private String Topic;
private String SubscriptionReference;
private Date UtcTime;
private List<Message> Messages;
...
}
而且我建议您在代码中使用lowerCamelCase命名变量约定,因为它最流行
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