Java 春天：返回@ResponseBody "ResponseEntity<List<JSONObject>>"
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Spring: return @ResponseBody "ResponseEntity<List<JSONObject>>"
提问by martin
In controller I create json array. If I return List<JSONObject>it is ok:
在控制器中，我创建了 json 数组。如果我回来List<JSONObject>就可以了：
@RequestMapping(value="", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody List<JSONObject> getAll() {
List<Entity> entityList = entityManager.findAll();
List<JSONObject> entities = new ArrayList<JSONObject>();
for (Entity n : entityList) {
JSONObject entity = new JSONObject();
entity.put("id", n.getId());
entity.put("address", n.getAddress());
entities.add(entity);
}
return entities;
}
but I need to return JSON array and HTTP status code:
但我需要返回 JSON 数组和 HTTP 状态代码：
@RequestMapping(value="", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody ResponseEntity<List<JSONObject>> getAll() {
List<Entity> entityList = entityManager.findAll();
List<JSONObject> entities = new ArrayList<JSONObject>();
for (Entity n : entityList) {
JSONObject Entity = new JSONObject();
entity.put("id", n.getId());
entity.put("address", n.getAddress());
entities.add(entity);
}
return new ResponseEntity<JSONObject>(entities, HttpStatus.OK); // XXX
}
Eclipse see error in XXX line:
Eclipse 在 XXX 行中看到错误：
Multiple markers at this line
- The constructor ResponseEntity<JSONObject>(List<JSONObject>, HttpStatus) is undefined
- Type mismatch: cannot convert from ResponseEntity<JSONObject> to
ResponseEntity<List<JSONObject>>
- Type mismatch: cannot convert from ResponseEntity<JSONObject> to JSONObject
How can I return json+http reply? There is my working code for returning one json object + http status code:
如何返回 json+http 回复？我的工作代码用于返回一个 json 对象 + http 状态代码：
@RequestMapping(value="/{address}", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody ResponseEntity<JSONObject> getEntity(@PathVariable("address") int address) {
Entity n = entityManager.findByAddress(address);
JSONObject o = new JSONObject();
o.put("id", n.getId());
o.put("address", n.getAddress());
return new ResponseEntity<JSONObject>(o, HttpStatus.OK);
}
采纳答案by martin
Now I return Object. I don't know better solution, but it works.
现在我回来了Object。我不知道更好的解决方案，但它有效。
@RequestMapping(value="", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody ResponseEntity<Object> getAll() {
List<Entity> entityList = entityManager.findAll();
List<JSONObject> entities = new ArrayList<JSONObject>();
for (Entity n : entityList) {
JSONObject Entity = new JSONObject();
entity.put("id", n.getId());
entity.put("address", n.getAddress());
entities.add(entity);
}
return new ResponseEntity<Object>(entities, HttpStatus.OK);
}
回答by user2428804
Instead of
代替
return new ResponseEntity<JSONObject>(entities, HttpStatus.OK);
try
尝试
return new ResponseEntity<List<JSONObject>>(entities, HttpStatus.OK);
回答by Sonata
Personally, I prefer changing the method signature to:
就个人而言，我更喜欢将方法签名更改为：
public ResponseEntity<?>
This gives the advantage of possibly returning an error message as single item for services which, when ok, return a list of items.
这提供了可能将错误消息作为服务的单个项目返回的优势，如果正常，则返回项目列表。
When returning I don't use any type (which is unused in this case anyway):
返回时我不使用任何类型（无论如何在这种情况下未使用）：
return new ResponseEntity<>(entities, HttpStatus.OK);
回答by Sonu patel
I am late for this but i want put some more solution relevant to this.
我为此迟到了，但我想提出更多与此相关的解决方案。
@GetMapping
public ResponseEntity<List<JSONObject>> getRole() {
return ResponseEntity.ok(service.getRole());
}
回答by Rivenfall
I have no idea why the other answers didn't work for me (error 500) but this works
我不知道为什么其他答案对我不起作用（错误 500）但这有效
@GetMapping("")
public String getAll() {
List<Entity> entityList = entityManager.findAll();
List<JSONObject> entities = new ArrayList<JSONObject>();
for (Entity n : entityList) {
JSONObject Entity = new JSONObject();
entity.put("id", n.getId());
entity.put("address", n.getAddress());
entities.add(entity);
}
return entities.toString();
}
