[英]How to write a String to POJO converter in my spring boot rest service?
我有一個JavaFX客戶端,它消耗了Spring Boot v2.0.0中實現的Rest Service,而在開發過程中,我確實創建了一個控制器,該控制器在Post請求中具有一個POJO列表作為請求參數,因此我可以在其中添加一組實體對象一個電話
這是我到目前為止所做的
我的控制器:
@PostMapping
private ServerResponse creatAllCompDatas(
@RequestParam final List<ComponentDataForm> componentDataFormValues
) {
if (isSessionValid()) {
List<Long> datasIds = new ArrayList();
componentDataFormValues.stream().forEach(formValue -> {
MNG_COMPOSANT_DATA mng_composant_data = new MNG_COMPOSANT_DATA();
mng_composant_data.setCmp_attr_code(formValue.getAttCode());
mng_composant_data.setCmp_attr_label(formValue.getAttTitle());
mng_composant_data.setCmp_attr_value(formValue.getAttVal());
datasIds.add(mng_composant_data.getId());
});
initSuccessResponse(datasIds);
return serverResponse;
}
initFailLoginResponse();
return serverResponse;
}
我的ComponentDataForm POJO(在這種情況下為DTO)
@Component
public class ComponentDataForm {
@JsonProperty("attCode")
private String attCode;
@JsonProperty("attTitle")
private String attTitle;
@JsonProperty("attVal")
private String attVal;
public ComponentDataForm() {
}
public String getAttCode() {
return attCode;
}
public void setAttCode(String attCode) {
this.attCode = attCode;
}
public String getAttTitle() {
return attTitle;
}
public void setAttTitle(String attTitle) {
this.attTitle = attTitle;
}
public String getAttVal() {
return attVal;
}
public void setAttVal(String attVal) {
this.attVal = attVal;
}
@Override
public int hashCode() {
int hash = 7;
hash = 29 * hash + Objects.hashCode(this.attCode);
hash = 29 * hash + Objects.hashCode(this.attTitle);
hash = 29 * hash + Objects.hashCode(this.attVal);
return hash;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final ComponentDataForm other = (ComponentDataForm) obj;
if (!Objects.equals(this.attCode, other.attCode)) {
return false;
}
if (!Objects.equals(this.attTitle, other.attTitle)) {
return false;
}
if (!Objects.equals(this.attVal, other.attVal)) {
return false;
}
return true;
}
@Override
public String toString() {
return "ComponentDataForm{" + "attCode=" + attCode + ", attTitle=" + attTitle + ", attVal=" + attVal + '}';
}
public ComponentDataForm(String attCode, String attTitle, String attVal) {
this.attCode = attCode;
this.attTitle = attTitle;
this.attVal = attVal;
}
}
由此我恢復了后端
現在,我將為您提供前端Javafx:
@FXML
private void doCommit(ActionEvent event) throws UnirestException{
if(validate()){
final ObservableList<AppDataAttTDO> items = tableAtributes.getItems();
final List<ComponentDataForm> componentDataFormValues = new ArrayList();
items.stream().forEach(item -> {
final ComponentDataForm requestItem = new ComponentDataForm();
requestItem.setAttCode(item.getAttCode());
requestItem.setAttTitle(item.getAttTitle());
requestItem.setAttVal(item.getAttValue());
componentDataFormValues.add(requestItem);
});
HttpResponse<String> asString = Unirest.post(APPLICATION_DATA_SERVICE_URL)
.queryString("componentDataFormValues", componentDataFormValues)
.asString();
System.out.println(asString.getStatus());
System.out.println(asString.getBody());
}
}
當我確實將客戶端的請求提交給服務器時,服務器拋出以下異常
2018-05-17 14:47:24.970 WARN 3660 --- [nio-8443-exec-7] .wsmsDefaultHandlerExceptionResolver:未能轉換請求元素:org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException:未能轉換以下項的值輸入'java.lang.String []'為必需的輸入類型'java.util.List'; 嵌套異常為java.lang.IllegalStateException:無法將類型“ java.lang.String”的值轉換為所需的類型“ com.easyData.pos.easyPos.rest.contoller.application.ComponentDataForm”:找不到匹配的編輯器或轉換策略
2018-05-17 14:47:24.970 WARN 3660 --- [nio-8443-exec-7] .wsmsDefaultHandlerExceptionResolver:由處理程序執行引起的已解決異常:org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException:無法轉換值'java.lang.String []'類型為必需的'java.util.List'類型; 嵌套異常為java.lang.IllegalStateException:無法將類型“ java.lang.String”的值轉換為所需的類型“ com.easyData.pos.easyPos.rest.contoller.application.ComponentDataForm”:找不到匹配的編輯器或轉換策略
經過1天的研究,我無法理解需要創建一個轉換器,通過擴展org.springframework.core.convert.converter.Converter;
將接收到的請求參數解析到我的POJO中org.springframework.core.convert.converter.Converter;
創建String,ComponentDataForm轉換器的接口
但是在這里,我不知道如何編寫此轉換器。
所以我迷失了,直到我動用了一些腦子並想到了一個主意
我的pojo是后端和前端之間共享的DTO,所以知道我不知道如何轉換,我確實說過為什么不將這個過程委派給某種機制
傑克遜API來了
我對toString dto的方法進行了重寫以編寫當前pojo的json字符串,在轉換器中,我所ObjectMapper
就是使用ObjectMapper
讀取此json並將其解析為我的pojo(DTO對象)
這是我的追求
@Override
public String toString() {
try {
return new ObjectMapper().writeValueAsString(this);
} catch (JsonProcessingException ex) {
Logger.getLogger(ApplicationFormAddController.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
對於我的轉換器
public class AppDataFormConverter implements Converter<String, ComponentDataForm>{
@Override
public ComponentDataForm convert(String s) {
System.out.println(s);
ObjectMapper objectMapper = new ObjectMapper();
try {
return objectMapper.readValue(s, ComponentDataForm.class);
} catch (IOException ex) {
Logger.getLogger(AppDataFormConverter.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println("handled here");
return new ComponentDataForm();
}
}
和轉換器注冊過程
@Configuration
public class ConvertersConfig extends WebMvcConfigurerAdapter{
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addConverter(new AppDataFormConverter());
super.addFormatters(registry); //To change body of generated methods, choose Tools | Templates.
}
}
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