我试图用一个自定义转换器与弹簧数据的MongoDB。 我想以编程方式创建它，但我得到了以下错误：
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type org.joda.time.LocalDate to type java.lang.String
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:475)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:175)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:154)
....
....
以下是失败的代码片段：
Mongo mongo = new Mongo();
MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(mongo, "database");
List<Converter> converters = new ArrayList<>();
converters.add(new LocalDateWriteConverter());
converters.add(new LocalDateReadConverter());
CustomConversions customConversions = new CustomConversions(converters);
MappingContext mappingContext = new SimpleMongoMappingContext();
MappingMongoConverter mappingMongoConverter = new MappingMongoConverter(mongoDbFactory, mappingContext);
mappingMongoConverter.setCustomConversions(customConversions);
MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory, mappingMongoConverter);
MongoDbEvent mongoEvent = new MongoDbEvent(new LocalDate(2012, 12, 8));
mongoTemplate.insert(mongoEvent);
这里是我的转换器类：
class LocalDateReadConverter implements Converter<String, LocalDate> {
@Override
public LocalDate convert(String s) {
// Conversion code omitted.
}
}
class LocalDateWriteConverter implements Converter<LocalDate, String> {
@Override
public String convert(LocalDate localDate) {
// Conversion code omitted.
}
}
我想坚持的类看起来是这样的：
import org.joda.time.LocalDate;
public class MongoDbEvent {
private String id;
private LocalDate date;
public MongoDbEvent(LocalDate date) {
this.date = date;
}
public String getId() {
return id;
}
public LocalDate getDate() {
return date;
}
@Override
public String toString() {
return "MongoDbEvent{" +
"id='" + id + '\'' +
", date=" + date +
'}';
}
}
Answer 1:
这个答案可能是在OP有点晚，但我只是碰到了同样的问题，今天找到了解决办法...
要以编程方式设置它，你需要调用MongoMappingConverter.afterPropertiesSet()你使用它之前。 我意识到这从阅读的代码MongoTemplate.getDefaultMongoConverter(MongoDbFactory)
下面是一个例子：
MappingMongoConverter converter = new MappingMongoConverter(mongoDbFactory, context);
converter.setTypeMapper(mapper);
converter.setCustomConversions(new CustomConversions(
Arrays.asList(
new TimeZoneReadConverter(),
new TimeZoneWriteConverter()
)
));
converter.afterPropertiesSet();
MongoTemplate template = new MongoTemplate(mongoDbFactory, converter);
Answer 2:
只是抬起头来。 我对这个问题苦苦挣扎spring-data-mongodb 1.5.1.RELEASE使用Java配置。 由于一些类已经改变了，我张贴我的解决方案。
加上以下定义与注释您的配置类@Configuration ：
@Bean
public Mongo mongo() throws Exception {
MongoPropertiesResolver resolver = mongoResolver();
return new MongoClient(resolver.getUrl());
}
@Bean
public MongoDbFactory mongoDbFactory() throws Exception {
return new SimpleMongoDbFactory(mongo(), "database");
}
@Bean
public MongoTemplate mongoTemplate() throws Exception {
return new MongoTemplate(mongoDbFactory(), mongoConverter());
}
@Bean
public CustomConversions customConversions() {
List<Converter<?, ?>> converters = new ArrayList<Converter<?, ?>>();
converters.add(new TimeZoneReadConverter());
converters.add(new TimeZoneReadConverter());
return new CustomConversions(converters);
}
@Bean
public MappingMongoConverter mongoConverter() throws Exception {
MongoMappingContext mappingContext = new MongoMappingContext();
DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory());
MappingMongoConverter mongoConverter = new MappingMongoConverter(dbRefResolver, mappingContext);
mongoConverter.setCustomConversions(customConversions());
return mongoConverter;
}
Answer 3:
如何自定义蒙戈自定义转换器在这里描述下详细：
http://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#mapping-configuration
我注入的缺省配置值，所以我可以从application.properties配置设置中受益。
@Configuration
public class MongoConfiguration extends AbstractMongoConfiguration {
@Value("${spring.data.mongodb.database:test}")
String database;
@Value("${spring.data.mongodb.host:localhost}:${spring.data.mongodb.port:27017}")
String host;
@Override
protected String getDatabaseName() {
return database;
}
@Override
public Mongo mongo() throws Exception {
return new MongoClient(host);
}
@Bean
@Override
public CustomConversions customConversions() {
List<Converter<?, ?>> converterList = new ArrayList<Converter<?, ?>>();
converterList.add(new MongoColorWriter());
converterList.add(new MongoColorReader());
return new CustomConversions(converterList);
}
}
Answer 4:
在Java 8推出java.time包的我遇到了类似的问题，在新包装使用新的和LOCALDATE类LocalDateTime。 这是我如何解决它：
我写了一个转换器，这些转换选项所有4：
- datetolocaldatetimeconvert是
- datetolocaldateconvert是
- localdatetimetodateconvert是
- localdatetodateconvert是
下面是一个例子
public class DateToLocalDateTimeConverter implements Converter<Date, LocalDateTime> {
@Override
public LocalDateTime convert(Date source) {
return source == null ? null : LocalDateTime.ofInstant(source.toInstant(), ZoneId.systemDefault());
}
}
然后，通过包括本在MongoDB的连接，我能够在Java中与MongoDB的工作8日的xml配置（记得要添加的所有转换器）：
<mongo:mapping-converter>
<mongo:custom-converters>
<mongo:converter>
<bean class="package.DateToLocalDateTimeConverter" />
</mongo:converter>
</mongo:custom-converters>
</mongo:mapping-converter>
Answer 5:
由于org.springframework.data:spring-data-commons:1.13.3.RELEASE ，这里是如何以编程方式创建MongoTemplate自定义转换器
public MongoTemplate mongoTemplate(String mongoUri) throws Exception {
MongoDbFactory factory = new SimpleMongoDbFactory(new MongoClientURI(mongoUri));
CustomConversions conversions = new CustomConversions(
Arrays.asList(new FooWriteConverter(), new FooReadConverter()));
MongoMappingContext mappingContext = new MongoMappingContext();
DbRefResolver dbRefResolver = new DefaultDbRefResolver(factory);
MappingMongoConverter mongoConverter = new MappingMongoConverter(dbRefResolver, mappingContext);
mongoConverter.setCustomConversions(conversions);
mongoConverter.afterPropertiesSet();
return new MongoTemplate(factory, mongoConverter);
}
（实施略）转换器
class FooWriteConverter implements Converter<Foo, DBObject> { ... }
class FooReadConverter implements Converter<DBObject, Foo> { ... }
Answer 6:
对我来说，这是我的注册转换器作为阅读器，而不是一个作家。 为了解决这个问题，你需要将@WritingConverter注释添加到您的转换器类
@Component
@WritingConverter
public class NoteWriterConverter implements Converter<Note, DBObject> {
@Override
public DBObject convert(Note source) {
DBObject obj = new BasicDBObject();
obj.put("title", source.getTitle());
obj.put("reviewDate", source.getReviewDate());
obj.removeField("_class");
return obj;
}
}
文章来源: Set MongoDb converter programmatically
