[英]Spring Data Rest Field converter
我很難在spring數據REST項目(控制器免費應用程序和嚴格的java配置)上使用我的自定義轉換器。
我有兩個實體,一個員工和一個州。 這種關系是@ManyToOne,我相信大家都知道。 無論如何,問題是轉換state
的字段(字段名為狀態) String
為State
目標和setState()
在Employee
類持久化到數據庫。
package com.hr.domain;
@Entity
public class Employee implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "state_id", nullable = true)
private Long id;
private String firstname;
private State state;
@StateConverter
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "employee_state_id_fk", nullable = false, insertable = true, updatable = true)
private State state;
//GETTERS AND SETTERS
public String getFirstname() {
return firstname();
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getState() {
return state();
}
public void setState(State state) {
this.state = state;
}
//HASHCODES AND EQUALS
}
package com.hr.domain;
@Entity
public class State implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "state_id", nullable = true)
private Long id;
private String state_name;
//GETTERS AND SETTERS
//TO STRING
@Override
public String toString() {
return "State [id=" + id + ", state_name=" + state_name + "]";
}
}
我已經使用轉換服務注冊了我的轉換器,但仍然無法在表單提交時將String轉換為State對象。
@Bean//(name="conversionService")
public ConversionService getConversionService() {
ConversionServiceFactoryBean bean = new ConversionServiceFactoryBean();
bean.setConverters(getConverters());
bean.afterPropertiesSet();
ConversionService object = bean.getObject();
System.out.println(object);
return object;
}
private Set<Converter> getConverters() {
Set<Converter> converters = new HashSet<Converter>();
converters.add(new StringToStateTypeConverter());
return converters;
}
這是我的StateConverter
@Component
@StateConverter
public class StringToStateTypeConverter implements Converter<String, State> {
@Autowired
StateRepository repository;
public State convert(String source) {
return repository.findOne(new Long(source));
}
}
提交時,我收到此錯誤:
由以下原因引起:org.springframework.core.convert.ConversionFailedException:無法從類型java.net.URI轉換為輸入值為'AB'的com.hr.domain.State;
任何形式的幫助將不勝感激。
願力量與你同在。
這是錯誤跟蹤
17:21:29,975 ERROR [org.springframework.data.rest.webmvc.AbstractRepositoryRestController] (default task-13) Could not read JSON: Failed to convert from type java.net.URI to type com.hr.domain.State for value 'AB'; nested exception is java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable. (through reference chain: com.hr.domain.Employee["State"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Failed to convert from type java.net.URI to type com.hr.domain.State for value 'AB'; nested exception is java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable. (through reference chain: com.hr.domain.Employee["State"]): org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Failed to convert from type java.net.URI to type com.hr.domain.State for value 'AB'; nested exception is java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable. (through reference chain: com.hr.domain.Employee["State"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Failed to convert from type java.net.URI to type com.hr.domain.State for value 'AB'; nested exception is java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable. (through reference chain: com.hr.domain.Employee["State"])
at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.readJavaType(MappingJackson2HttpMessageConverter.java:228) [spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
...........
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Failed to convert from type java.net.URI to type com.hr.domain.State for value 'AB'; nested exception is java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable. (through reference chain: com.hr.domain.Employee["State"])
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:232) [jackson-databind-2.3.3.jar:2.3.3]
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:197) [jackson-databind-2.3.3.jar:2.3.3]
Caused by: org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.net.URI to type com.hr.domain.State for value 'AB'; nested exception is java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable.
at org.springframework.data.rest.core.UriToEntityConverter.convert(UriToEntityConverter.java:106) [spring-data-rest-core-2.1.0.RELEASE.jar:]
at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$UriStringDeserializer.deserialize(PersistentEntityJackson2Module.java:359) [spring-data-rest-webmvc-2.1.0.RELEASE.jar:]
Caused by: java.lang.IllegalArgumentException: Cannot resolve URI AB. Is it local or remote? Only local URIs are resolvable.
... 94 more
您注冊了一個新的ConversionService
。 它取代了默認情況下彈簧注冊的默認值,通常假定存在許多轉換器。 並且您創建了一個新的轉換器,而不是使用您配置的bean。 你應該改為:
您的轉換服務初始化可能如下所示:
private @Autowired StringToStateTypeConverter stringToStateTypeConverter;
@Bean//(name="conversionService")
public ConversionService getConversionService() {
ConversionServiceFactoryBean bean = new DefaultFormattingConversionService();
bean.addConverter(String.class, State.class, stringToStateTypeConverter);
return bean;
}
編輯
由於錯誤來自從URI
到State
的轉換問題,您可以嘗試將URI轉換為State(假設您的存儲庫有一個方法findByName
以按name
查找State
:
@Component
@StateConverter
public class URIToStateTypeConverter implements Converter<URI, State> {
@Autowired
StateRepository repository;
public State convert(URI uri) {
String source = uri.toString();
try {
long id = Long.valueOf(source);
return repository.findOne(id);
} catch (NumberFormatException e) { // should be a name ??
return repository.findByName(source);
}
}
}
轉換服務初始化將變為:
private @Autowired StringToStateTypeConverter stringToStateTypeConverter;
private @Autowired URIToStateTypeConverter uriToStateTypeConverter;
@Bean//(name="conversionService")
public ConversionService getConversionService() {
ConversionServiceFactoryBean bean = new DefaultFormattingConversionService();
bean.addConverter(String.class, State.class, stringToStateTypeConverter);
bean.addConverter(URI.class, State.class, uriToStateTypeConverter);
return bean;
}
但我不確定它是否會被spring-data-rest使用
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