我有一個REST API,我想調用一個從csv文件創建TreeMap的方法,並且我希望爲每個API調用的其餘部分使用TreeMap。所以我只是想要調用該方法來設置TreeMap並且想要使用TreeMap來處理其餘的API調用。如何在控制器中只調用一次calla方法
我創建映像樹的方法是
public void createTreeMap(){
CSVReader reader = new CSVReader(new FileReader("C:\\Users\\result.csv"), ',' , '"' , 1);
TreeMap <Integer,ArrayList<Long>> result=new TreeMap <Integer,ArrayList<Long>>();
//Read CSV line by line and use the string array as you want
String[] nextLine;
while ((nextLine = reader.readNext()) != null) {
if (nextLine != null) {
//Verifying the read data here
ArrayList<Long> result_01 = new ArrayList<Long>();
for(int k=0;k<nextLine[1].replace("[", "").replace("]", "").replace(" ", "").split(",").length;k++){
result_01.add(Long.parseLong(nextLine[1].replace("[", "").replace("]", "").replace(" ", "").split(",")[k]));
}
result.put(Integer.parseInt(nextLine[0]), result_01);
}
}
}
所以下面是REST API控制器
@RestController
public class HomeController {
@RequestMapping(value="/api/sid",produces={MediaType.APPLICATION_JSON_VALUE},method=RequestMethod.GET)
public ResponseEntity<Map<String, List<Model>>> getid(@RequestParam("sid") int sid) {
Map<String, List<Model>> Map = new HashMap<String, Object>();
List<Model> model=new List<Model>();
model=get_model();
Map.put("hi",model)
return new ResponseEntity<Map<String, List<Model>>>(Map,HttpStatus.OK);
}
@ResponseBody
public List<Model> get_model(){
List list =new List<Model>();
//here I have to use the treemap
return list;
}
}
我可以創建樹當每次API代替called.but我的時間地圖需要創建它只有一次,並訪問響應正文get_model方法。任何幫助表示讚賞。
使用緩存怎麼樣? –
我應該在哪裏定義緩存? – RKR
https://docs.spring.io/spring/docs/current/spring-framework-reference/html/cache.html –