[英]Best way to load some JSON files into a Spring Boot application
我将要创建一个 Rest webservice 应用程序,我需要在应用程序启动时加载作为参数传递的文件夹中存在的所有 JSON 文件(在 application.yml aprii 中),以便稍后在 webservices 的方法中使用它们作为bean 列表(每个 JSON 文件对应一个 bean)。
进一步解释我的要求的示例:
应用程序.yml :
json.config.folder: /opt/my_application/json_configs
我的应用程序.java :
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);
}
}
具有此结构的 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将包含先验的 JSON 文件信息:
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;
}
}
另一个名为 Operator.java 的类包含所有操作员信息。
是否有一种方法可以在应用程序启动时初始化包含所有 JSON 文件信息的ContextOperatorBean
对象列表,并在我的 Web 服务方法(RestAPI.java 类)中使用它们?
不知道以下幼稚的实现是否满足“最佳”的标准,但您可以创建一个处理此责任的新服务,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;
}
}
注意:忽略了处理失败或意外情况以及一些实现细节。
然后@Autowire
它在您的控制器中并调用getMatchingOperators()
以仅过滤匹配的条目。
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