使用Spring映射嵌套的json和POJO [英] mapping nested json and POJOs using Spring
问题描述
我正在实现一个REST API，该API使用json发送和接收数据(对于该API设计我是全新的).我正在使用Spring框架和requestbody/responsebody进行映射. 最初，我有这样的pojo:
I am implementing a REST API which send and receive data with json(I am totally new to this API design). I am using Spring framework and requestbody/responsebody for mapping. Initially, I had a pojo like this:
public class Action implements Serializable {
@Id
private String id;
private String name;
private String applicationId;
private String timeStamp;
private String username;
private String options;
//Getters and Setters
}
此pojo的json格式如下:
and the json format for this pojo is like this:
{
"id": "11954cd5-eec3-4f68-b0e8-a4d9b6a976a9",
"name": "kill button",
"applicationId": "34fa7bbf-e49f-4f2a-933a-de26b9fdb0f1",
"timeStamp": "2014-03-05T11:51+0000",
"username": "user1783",
"options": "facebook app"
}
这是控制器的样子:我没有得到任何json，Spring已经将其转换为java对象，应该自己手动执行吗?
This is how the controller look like:I do not get any json, Spring is converting already to java object, should it do it manually myself?
@RequestMapping(value = "applications/{appId}/actions", method = RequestMethod.POST, consumes = "application/json", produces = "application/json")
@ResponseBody
public Action addAction(@PathVariable String appId, @RequestBody Action action) {
return actionService.add(appId, action);
}
您可以在这里找到它的漂亮json格式: https://gist.github.com/bakharzy/8948950
you can find a pretty json format of it here: https://gist.github.com/bakharzy/8948950
我想将json中的最后一对更改为json本身，因为它以要点的第二个json格式显示.因此，用户可以发送更多信息.现在，我有了一种新的json格式，即json中的json格式，我该如何更改pojo(私有String选项；)来存储来自第二个json格式的数据.请注意，内部json可以具有任意数量的对.
I want to change the last pair in the json to be a json itself as it is shown in the second json format in gist. So user can send more information. Now that I have a new format for json which is kind of json in json, how should I change the pojo (private String options;) to store the data coming from second json format. Note that the inner json can have arbitrary number of pairs.
我的第一个想法是将pojo中的选项更改为类似Hash对象的内容.可以吗?如果可以，怎么办?
My first idea is to change the options in pojo to something like Hash object. Is it doable? If so, how?
谢谢
推荐答案
只需使用嵌套对象，如下所示:
Just use a nested Object like so:
public class Action implements Serializable {
@Id
private String id;
private String name;
private String applicationId;
private String timeStamp;
private String username;
private Map<String, String> options;
//Getters and Setters
}
这将为您提供以下格式:
This will give you this format:
{
"id": "11954cd5-eec3-4f68-b0e8-a4d9b6a976a9",
"name": "kill button",
"applicationId": "34fa7bbf-e49f-4f2a-933a-de26b9fdb0f1",
"timeStamp": "2014-03-05T11:51+0000",
"username": "user1783",
"options":{
"data": "Click Here",
"size": "36",
"application":"facebook app"
}
}
更新:-添加测试以证明该解决方案确实有效.
UPDATE: - Adding test to prove that the solution does indeed work.
public class ActionTest {
@Test
public void testObjectToJson() throws JsonProcessingException {
Action action = new Action();
action.setId("id");
action.setUsername("username");
action.setApplicationId("applicationId");
action.setName("name");
action.setTimeStamp("timestamp");
Map<String, String> map = Maps.newHashMap();
map.put("key", "value");
map.put("key2", "value2");
action.setOptions(map);
ObjectMapper mapper = new ObjectMapper();
String value = mapper.writeValueAsString(action);
System.out.println(value);
}
@Test
public void testJsonToObject() throws IOException {
String json = "{\"id\":\"id\",\"name\":\"name\",\"applicationId\":\"applicationId\",\"timeStamp\":\"timestamp\",\"username\":\"username\",\"options\":{\"key\":\"value\", \"key2\":\"value2\"}}";
ObjectMapper mapper = new ObjectMapper();
Action value = mapper.readValue(json, Action.class);
System.out.println(value);
}
}
class Action {
private String id;
private String name;
private String applicationId;
private String timeStamp;
private String username;
private Map<String, String> options;
public Action() {}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer("Action{");
sb.append("id='").append(id).append('\'');
sb.append(", name='").append(name).append('\'');
sb.append(", applicationId='").append(applicationId).append('\'');
sb.append(", timeStamp='").append(timeStamp).append('\'');
sb.append(", username='").append(username).append('\'');
sb.append(", options=").append(options);
sb.append('}');
return sb.toString();
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getApplicationId() {
return applicationId;
}
public void setApplicationId(String applicationId) {
this.applicationId = applicationId;
}
public String getTimeStamp() {
return timeStamp;
}
public void setTimeStamp(String timeStamp) {
this.timeStamp = timeStamp;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Map<String, String> getOptions() {
return options;
}
public void setOptions(Map<String, String> options) {
this.options = options;
}
}
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