最佳方式

Question

我要創建一個webservice的休息申請，我需要加載存在作爲參數傳遞的文件夾中的所有文件JSON（在application.yml先驗） ，在應用程序啓動時，稍後在webservices的方法中使用它們作爲bean的列表（每個JSON文件對應一個bean）。

的樣品來進一步說明我的要求：

application.yml：

json.config.folder: /opt/my_application/json_configs 

MyApplication.java：具有這種結構

package com.company; 

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 

@SpringBootApplication 
public class MyApplication { 
    public static void main(String[] args) { 
     SpringApplication.run(MyApplication.class, args); 
    } 
} 

JSON文件：

{ 
    "key":"YYYYY", 
    "operator_list":[ 
     { 
      "name":"operator1", 
      "configs":{ 
       "id":"XXXXX1", 
       "path":"xxxx2" 
      } 
     }, 
     { 
      "name":"operator2", 
      "configs":{ 
       "id":"XXXXX1", 
       "passphrase":"xxxx2", 
       "user_id":"XXXX3", 
       "password":"XXXXX" 
      } 
     }, 
     { 
      "name":"operator3", 
      "configs":{ 
       "user_id":"XXXXX1" 
      } 
     } 
    ] 
    } 

RestAPI.java

@RestController 
@RequestMapping("/my_app_url") 
@PropertySource(value={"classpath:application.yml"}) 
public class RestAPI { 
    //Some fields 
    .... 

    //Some methods 
    .... 

    //Method that return operator list of a given context (correspond to the field "key" of the json file) 
    @RequestMapping("/getOperatorList") 
    public List<Operator> getOperatorList(@RequestParam(value = "context", defaultValue = "YYYYY") String context) throws Exception{ 
     List<Operator> result = null; 
     //Here, i need to loop the objects , that are supposed to be initialized during application startup 
     //(but i I do not know yet how to do it) with data from JSON files 
     //to find the one that correspond to the context in parameter and return its operator list 

     return result; 
    } 
} 

ContextOperatorBean.java將包含JSON文件的相關信息先驗：

package com.company.models; 

import java.util.List; 

public class ContextOperatorBean { 
    String key; 
    List<Operator> operator_list; 

    public ContextOperatorBean() { 
    } 

    public ContextOperatorBean(String key, List<PaymentMethod> operator_list) { 
     this.key = key; 
     this.operator_list = operator_list; 
    } 

    public String getKey() { 
     return key; 
    } 

    public void setKey(String key) { 
     this.key = key; 
    } 

    public List<Operator> getOperator_list() { 
     return operator_list; 
    } 

    public void setOperator_list(List<Operator> operator_list) { 
     this.operator_list = operator_list; 
    } 
} 

並號召Operator.java包含所有運營商的相關信息的類。

是否有一種方法可以在應用程序啓動時初始化一個包含所有JSON文件信息的ContextOperatorBean對象列表，並在我的webservice方法（RestAPI.java類）中使用它們？

Answer 1

不知道，如果下面的天真實現滿足是「最好的」繞圈，但你可以創建一個新的服務，這種責任涉及，例如：

@Service 
public class OperatorsService { 

    @Value("${json.config.folder}") 
    String jsonConfigFolder; 

    List<ContextOperatorBean> operators = new ArrayList<>(); 

    @PostConstruct 
    public void init() throws IOException { 
     ObjectMapper jsonMapper = new ObjectMapper(); 
     for (File jsonFile : getFilesInFolder(jsonConfigFolder)) { 
      // deserialize contents of each file into an object of type 
      ContextOperatorBean operator = jsonMapper.readValue(jsonFile, new TypeReference<List<ContextOperatorBean>>() {}); 
      operators.add(operator); 
     } 
    } 

    public List<ContextOperatorBean> getMatchingOperators(String context) { 
     return operators.stream().filter(operator -> checkIfMatches(operator, context)).collect(Collectors.toList()); 
    } 

    private boolean checkIfMatches(ContextOperatorBean operator, String context) { 
     // TODO implement 
     return false; 
    } 

    private File[] getFilesInFolder(String path) { 
     // TODO implement 
     return null; 
    } 
} 

注：離開了處理故障或意外情況和一些實施細節。

然後@Autowire它在你的控制器，並呼籲getMatchingOperators()僅過濾匹配的條目。