(Spring MVC/Jackson)将查询参数映射到@ModelAttribute:LOWERCASE_WITH_UNDERSCORE到SNAKE_CASE失败 [英] (Spring MVC / Jackson) Mapping query parameters to @ModelAttribute: LOWERCASE_WITH_UNDERSCORE to SNAKE_CASE fails
问题描述
@GetMapping("item")
public @ResponseBody String get(@ModelAttribute Item item)
Item
具有属性
-
name
itemType
当我访问/item?name=foo&item_type=bar
时,item
仅用name
填充而不用itemType
填充.
When I access /item?name=foo&item_type=bar
the item
gets
populated only with name
not with itemType
.
我尝试了很多事情来从item_type
映射到itemType
属性.
I tried a bunch of things to get the itemType
attribute mapped from item_type
.
- 在
Item
的itemType
属性内添加了@JsonProperty("item_type"). 在此处描述. - 添加了一个JackonConfiguration,用于将propertyNamingStrategy设置为PropertyNamingStrategy.SNAKE_CASE. 在此处描述.
- 已将spring.jackson.property-naming-strategy = SNAKE_CASE添加到我的Spring Boot application.properties文件中. 在此处描述
- 在
Item
类级别上添加了PropertyNamingStrategy. 在此处描述.
- Added @JsonProperty("item_type") inside
Item
'sitemType
attribute. Described here. - Added a JackonConfiguration that sets the propertyNamingStrategy to PropertyNamingStrategy.SNAKE_CASE. Described here.
- Added spring.jackson.property-naming-strategy=SNAKE_CASE to my Spring Boot application.properties file. Described here
- Added the PropertyNamingStrategy on the
Item
class level. Described here.
我该如何解决?
顺便说一句.对于Item
的传入而不传出JSON序列化,我只有这个问题.
Btw. I only have this problem for incoming not outgoing JSON serialization of Item
.
更新04/24/17:
下面是一个最小的示例来演示该问题:
在访问/item
时,您会看到传出" JSON序列化有效,但是在访问/item/search?name=foo&item_type=bar
时,它对于传入" JSON反序列化不起作用.
Below a minimal sample to demonstrate the problem:
When visiting /item
you will see that the 'outgoing' JSON serialization works but when visiting /item/search?name=foo&item_type=bar
it does not work for 'incoming' JSON deserialization.
项目
package sample;
import java.io.Serializable;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.PropertyNamingStrategy.SnakeCaseStrategy;
import com.fasterxml.jackson.databind.annotation.JsonNaming;
@JsonNaming(SnakeCaseStrategy.class)
public class Item implements Serializable {
private String name;
@JsonProperty("item_type")
private String itemType;
public Item() { }
public Item(String name, String itemType) {
this.name = name;
this.itemType = itemType;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getItemType() {
return itemType;
}
public void setItemType(String itemType) {
this.itemType = itemType;
}
}
ItemController.java
ItemController.java
package sample;
import org.springframework.data.domain.Page;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/item")
public class ItemController {
@GetMapping("search")
public @ResponseBody Page<Item> search(@ModelAttribute Item probe) {
System.out.println(probe.getName());
System.out.println(probe.getItemType());
//query repo by example item probe here...
return null;
}
@GetMapping
public Item get() {
return new Item("name", "itemType");
}
}
JacksonConfiguration.java
JacksonConfiguration.java
package sample;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
@Configuration
public class JacksonConfiguration {
@Bean
public Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder() {
return new Jackson2ObjectMapperBuilder()
.propertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
}
}
SampleBootApplication.java
SampleBootApplication.java
package sample;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SampleBootApplication {
public static void main(String[] args) {
SpringApplication.run(SampleBootApplication.class, args);
}
}
application.properties
application.properties
logging.level.org.springframework=INFO
spring.profiles.active=dev
spring.jackson.property-naming-strategy=SNAKE_CASE
pom.xml
<?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>sample</groupId>
<artifactId>sample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<exclusions>
<exclusion>
<groupId>nz.net.ultraq.thymeleaf</groupId>
<artifactId>thymeleaf-layout-dialect</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<!-- Spring Boot Actuator displays build-related information if a META-INF/build-info.properties
file is present -->
<goals>
<goal>build-info</goal>
</goals>
<configuration>
<additionalProperties>
<encoding.source>${project.build.sourceEncoding}</encoding.source>
<encoding.reporting>${project.reporting.outputEncoding}</encoding.reporting>
<java.source>${maven.compiler.source}</java.source>
<java.target>${maven.compiler.target}</java.target>
</additionalProperties>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
推荐答案
在没有Spring的帮助下完成了Jackson的工作.
Solved by doing the Jackson work without the help of Spring.
@GetMapping("search")
public @ResponseBody Page<Item> search(@RequestParam Map<String,String> params) {
ObjectMapper mapper = new ObjectMapper();
//Not actually necessary
//mapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
Item probe = mapper.convertValue(params, Item.class);
System.out.println(probe.getName());
System.out.println(probe.getItemType());
//query repo by example item probe here...
return null;
}
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