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问将查询参数映射到@ModelAttribute不尊重@JsonProperty名称
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Stack Overflow用户

提问于 2017-04-19 18:58:04

回答 4查看 12.3K关注 0票数 21

@GetMapping("item")
public @ResponseBody String get(@ModelAttribute Item item)

Item具有以下属性

name
itemType

当我访问/item?name=foo&item_type=bar时，item只使用name 填充，而不是用itemType填充。

为了从itemType映射item_type属性，我尝试了许多方法。

在Item的itemType属性. Described here中添加了@JsonProperty(“Item”)。
添加了一个将JackonConfiguration设置为PropertyNamingStrategy.SNAKE_CASE的propertyNamingStrategy。Described here。
将spring.jackson.property-naming-strategy=SNAKE_CASE添加到我的Spring application.properties文件中。Described here
在PropertyNamingStrategy类级别上添加了Item。Described here。

我怎么才能解决这个问题？

顺便说一句。对于传入的JSON，而不是Item的传出JSON序列化，我只有这个问题。

更新04/24/17:

下面是一个演示问题的最小示例:当访问/item时，您将看到“传出”JSON序列化工作，但在访问/item/search?name=foo&item_type=bar时，它不适用于“传入”JSON反序列化。

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

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

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

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

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>

jackson

naming

spring

spring-mvc

spring-boot

Stack Overflow用户

发布于 2017-04-29 00:18:14

如果您在默认参数映射方面遇到问题，或者有一个具有复杂创建逻辑的对象，则可以尝试实现一个HandlerMethodArgumentResolver。这将允许您将类用作控制器方法参数，并在其他地方完成映射。

public class ItemArgumentResolver implements HandlerMethodArgumentResolver {

    @Override
    public boolean supportsParameter(MethodParameter methodParameter) {
        return methodParameter.getParameterType().equals(Item.class);
    }

    @Override
    public Object resolveArgument(MethodParameter methodParameter,
                              ModelAndViewContainer modelAndViewContainer,
                              NativeWebRequest nativeWebRequest,
                              WebDataBinderFactory webDataBinderFactory) throws Exception {
        Item item = new Item();
        item.setName(nativeWebRequest.getParameter("name"));
        item.setItemType(nativeWebRequest.getParameter("item_type"));
        return item;
    }

}

然后，您必须在web应用程序配置中注册：

@Configuration
public class WebAppConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
      argumentResolvers.add(new ItemArgumentResolver());
    }

}

现在，您可以使用Item类作为控制器方法参数，而不必实例化每个方法中的每个对象：

@RequestMapping("/items")
public @ResponseBody String get(Item item){ ... }

票数 4

查看全部 4 条回答

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/43503977

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