我正在实现一个REST API,它使用json发送和接收数据(我对这个API设计是全新的)。我使用Spring框架和requestbody / responsebody进行映射。 最初,我有一个这样的pojo:
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
}
这个pojo的json格式是这样的:
{
"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"
}
这就是控制器的样子:我没有得到任何json,Spring已经转换为java对象,是否应该自己手动执行?
@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);
}
你可以在这里找到一个漂亮的json格式: https://gist.github.com/bakharzy/8948950
我想将json中的最后一对更改为json本身,因为它在gist中以第二种json格式显示。因此用户可以发送更多信息。现在我有一个json的新格式,这是json中的一种json,我应该如何更改pojo(私有String options;)来存储来自第二种json格式的数据。注意,内部json可以具有任意数量的对。
我的第一个想法是将pojo中的选项更改为Hash对象。它可行吗?如果是这样,怎么样?
由于
答案 0 :(得分:5)
只需使用嵌套的对象:
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:
{
"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: - 添加测试以证明解决方案确实有效。
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;
}
}
答案 1 :(得分:-1)
Map<String, Object> innerMap = new WhateverMap<String, Object>();
innerMap.put("data", "click here");
innerMap.put("size", "36");
innerMap.put("application", "facebook app");
Map<String, Object> outerMap = new WhateverMap<String, Object>();
outerMap.put("name", "kill button");
outerMap.put("username", "user1783");
outerMap.put("options", innerMap);
String jsonString = jsonEncoder.encode(outerMap);