找不到适合 GeoJsonPoint 类型的构造函数
No suitable constructor found for type GeoJsonPoint
很难弄清楚我做错了什么。遗憾的是,我曾经让它工作过,但无法确定我所做的更改破坏了它。
据我了解,现在应该完全支持它。
有问题的对象:
@Document
public class Place {
public final static String URI = "/place";
@Id private String id;
private String name;
private String caption;
private GeoJsonPoint location;
public Place() {}
public Place(GeoJsonPoint geoJsonPoint) {
this.location = geoJsonPoint;
}
// Proper getters & setters clipped.
}
调用(出于某种原因,我的 Spring Boot 版本包含额外的 x/y 坐标。)
{
"id": null,
"name": null,
"caption": null,
"location": {
"x": 41.988161,
"y": -87.6911499,
"type": "Point",
"coordinates": [
41.988161,
-87.6911499
]
}
}
Pom(也许我有 wrong/clashing 依赖项?)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>0.1.0</version>
<properties>
<start-class>com.nestorledon.hang2gether.core.Application</start-class>
<!-- Includes new GeoJson support. -->
<spring-data-releasetrain.version>Fowler-RELEASE</spring-data-releasetrain.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.0.M2</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.hateoas</groupId>
<artifactId>spring-hateoas</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.oauth</groupId>
<artifactId>spring-security-oauth2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test-mvc</artifactId>
<version>1.0.0.M2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
<repository>
<id>spring-milestone</id>
<url>https://repo.spring.io/libs-milestone</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</pluginRepository>
</pluginRepositories>
</project>
终于成功了。
创建了自定义 JsonDeserializer
public class GeoJsonDeserializer extends JsonDeserializer<GeoJsonPoint> {
private final static String GEOJSON_TYPE_POINT = "Point";
private final static String JSON_KEY_GEOJSON_TYPE = "type";
private final static String JSON_KEY_GEOJSON_COORDS = "coordinates";
@Override
public GeoJsonPoint deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
final JsonNode tree = jp.getCodec().readTree(jp);
final String type = tree.get(JSON_KEY_GEOJSON_TYPE).asText();
final JsonNode coordsNode = tree.get(JSON_KEY_GEOJSON_COORDS);
double x = 0;
double y = 0;
if(GEOJSON_TYPE_POINT.equalsIgnoreCase(type)) {
x = coordsNode.get(0).asDouble();
y = coordsNode.get(1).asDouble();
}
else {
System.out.println(String.format("No logic present to deserialize %s ", tree.asText()));
}
final GeoJsonPoint point = new GeoJsonPoint(x, y);
return point;
}
}
然后我就在 属性 本身上指定了一个转换器。
@JsonDeserialize(using = GeoJsonDeserializer.class)
private GeoJsonPoint location;
Spring Data MongoDB 已经包含一个可以在 jackson 中注册以反序列化 GeoJsonPoint 的模块。
要安装(在 spring 引导中)只需添加到您的配置 class:
@Bean
public Module registerGeoJsonModule(){
return new GeoJsonModule();
}
那么你应该可以使用反序列化:
{
"location":{
"x":0,
"y":0
}
}
GeoJsonModule 很有魅力:)
mapper.registerModule(new GeoJsonModule());
像这样你可以注册任何自定义的ObjectMapper
:
@Configuration
public class HttpMessageConvertersConfig implements WebMvcConfigurer {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json()
.modules(new JavaTimeModule(), new Jdk8Module(), new GeoJsonModule())
.build();
converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
}
}
将其放入@Configuration class
@Bean
public GeoJsonModule geoJsonModule() {
return new GeoJsonModule();
}
很难弄清楚我做错了什么。遗憾的是,我曾经让它工作过,但无法确定我所做的更改破坏了它。
据我了解,现在应该完全支持它。
有问题的对象:
@Document
public class Place {
public final static String URI = "/place";
@Id private String id;
private String name;
private String caption;
private GeoJsonPoint location;
public Place() {}
public Place(GeoJsonPoint geoJsonPoint) {
this.location = geoJsonPoint;
}
// Proper getters & setters clipped.
}
调用(出于某种原因,我的 Spring Boot 版本包含额外的 x/y 坐标。)
{
"id": null,
"name": null,
"caption": null,
"location": {
"x": 41.988161,
"y": -87.6911499,
"type": "Point",
"coordinates": [
41.988161,
-87.6911499
]
}
}
Pom(也许我有 wrong/clashing 依赖项?)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>0.1.0</version>
<properties>
<start-class>com.nestorledon.hang2gether.core.Application</start-class>
<!-- Includes new GeoJson support. -->
<spring-data-releasetrain.version>Fowler-RELEASE</spring-data-releasetrain.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.0.M2</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.hateoas</groupId>
<artifactId>spring-hateoas</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.oauth</groupId>
<artifactId>spring-security-oauth2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test-mvc</artifactId>
<version>1.0.0.M2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
<repository>
<id>spring-milestone</id>
<url>https://repo.spring.io/libs-milestone</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</pluginRepository>
</pluginRepositories>
</project>
终于成功了。
创建了自定义 JsonDeserializer
public class GeoJsonDeserializer extends JsonDeserializer<GeoJsonPoint> {
private final static String GEOJSON_TYPE_POINT = "Point";
private final static String JSON_KEY_GEOJSON_TYPE = "type";
private final static String JSON_KEY_GEOJSON_COORDS = "coordinates";
@Override
public GeoJsonPoint deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
final JsonNode tree = jp.getCodec().readTree(jp);
final String type = tree.get(JSON_KEY_GEOJSON_TYPE).asText();
final JsonNode coordsNode = tree.get(JSON_KEY_GEOJSON_COORDS);
double x = 0;
double y = 0;
if(GEOJSON_TYPE_POINT.equalsIgnoreCase(type)) {
x = coordsNode.get(0).asDouble();
y = coordsNode.get(1).asDouble();
}
else {
System.out.println(String.format("No logic present to deserialize %s ", tree.asText()));
}
final GeoJsonPoint point = new GeoJsonPoint(x, y);
return point;
}
}
然后我就在 属性 本身上指定了一个转换器。
@JsonDeserialize(using = GeoJsonDeserializer.class)
private GeoJsonPoint location;
Spring Data MongoDB 已经包含一个可以在 jackson 中注册以反序列化 GeoJsonPoint 的模块。
要安装(在 spring 引导中)只需添加到您的配置 class:
@Bean
public Module registerGeoJsonModule(){
return new GeoJsonModule();
}
那么你应该可以使用反序列化:
{
"location":{
"x":0,
"y":0
}
}
GeoJsonModule 很有魅力:)
mapper.registerModule(new GeoJsonModule());
像这样你可以注册任何自定义的ObjectMapper
:
@Configuration
public class HttpMessageConvertersConfig implements WebMvcConfigurer {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json()
.modules(new JavaTimeModule(), new Jdk8Module(), new GeoJsonModule())
.build();
converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
}
}
将其放入@Configuration class
@Bean
public GeoJsonModule geoJsonModule() {
return new GeoJsonModule();
}