Java Spring配置@ResponseBody JSON格式
假设我在Spring3@控制器中有这个带注释的方法Java Spring配置@ResponseBody JSON格式,java,spring,spring-mvc,jackson,Java,Spring,Spring Mvc,Jackson,假设我在Spring3@控制器中有这个带注释的方法 @RequestMapping("") public @ResponseBody MyObject index(@RequestBody OtherObject obj) { MyObject result = ...; return result; } 但我需要配置输出json格式,就像我在做: ObjectMapper om = new ObjectMapper(); om.configure(JsonGenerator.
@RequestMapping("")
public @ResponseBody MyObject index(@RequestBody OtherObject obj) {
MyObject result = ...;
return result;
}
但我需要配置输出json格式,就像我在做:
ObjectMapper om = new ObjectMapper();
om.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, true);
om.getSerializationConfig()
.setSerializationInclusion(JsonSerialize.Inclusion.NON_DEFAULT);
om.getSerializationConfig()
.set(SerializationConfig.Feature.INDENT_OUTPUT, false);
有没有办法配置此行为
我发现了几个相关的问题,但我不确定如何使它们适应我的具体情况:
谢谢大家! 您可以将ObjectMapper配置为SpringXML文件中的bean。保存对ObjectMapper的引用的是
MappingJacksonJsonView
类。然后需要将视图附着到ViewResolver
像这样的方法应该会奏效:
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
<entry key="html" value="text/html" />
</map>
</property>
<property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</list>
</property>
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<property name="prefixJson" value="false" />
<property name="objectMapper" value="customObjectMapper" />
</bean>
</list>
</property>
</bean>
其中customObjectMapper
在xml文件的其他地方定义。请注意,您可以使用Enum Jackson定义直接设置Spring属性值;看
此外,ContentNegotingViewResolver可能不是必需的,它只是我在现有项目中使用的代码。改变了方向
这就是我最后做的,以防万一有人觉得有用
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="objectMapper" ref="jacksonObjectMapper" />
</bean>
</list>
</property>
</bean>
<!-- jackson configuration : https://stackoverflow.com/questions/3661769 -->
<bean id="jacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />
<bean id="jacksonSerializationConfig" class="org.codehaus.jackson.map.SerializationConfig"
factory-bean="jacksonObjectMapper" factory-method="getSerializationConfig" />
<bean
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetObject" ref="jacksonSerializationConfig" />
<property name="targetMethod" value="setSerializationInclusion" />
<property name="arguments">
<list>
<value type="org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion">NON_DEFAULT</value>
</list>
</property>
</bean>
是的,但是如果您开始使用mixin,会发生什么呢?例如,您不能将ObjectMapper作为一个单例,因为您将全局应用配置。因此,您将在同一ObjectMapper实例上添加或设置mixin类?看看Rick Hightower的方法。他的方法避免了将ObjectMapper配置为单例,并允许您按照每个请求方法以不同的方式过滤同一对象的JSON响应
我编写了自己的FactoryBean,它实例化了ObjectMapper(简化版):
公共类ObjectMapperFactoryBean实现FactoryBean{
@凌驾
公共ObjectMapper getObject()引发异常{
ObjectMapper mapper=新的ObjectMapper();
mapper.getSerializationConfig().setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
返回映射器;
}
@凌驾
公共类getObjectType(){
返回ObjectMapper.class;
}
@凌驾
公共布尔isSingleton(){
返回true;
}
}
以及spring配置中的用法:
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="objectMapper" ref="jacksonObjectMapper" />
</bean>
</list>
</property>
</bean>
我需要解决非常类似的问题,那就是将Jackson Mapper配置为“看在上帝的份上,不要序列化空值!!!” 我不想留下花哨的mvc:annotation-driven标记,所以我找到了如何在不删除mvc:annotation-driven和添加不太花哨的contentnegotingviewresolver的情况下配置Jackson的ObjectMapper 最美妙的是,您不必自己编写任何Java代码 这里是XML配置(不要与Jackson类的不同名称空间混淆,我只是使用了新的Jakson 2.x库……同样的配置也适用于Jackson 1.x库):
非空
在spring3.2中,新的解决方案由以下内容引入:,
以下是我的例子:
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean
class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="featuresToEnable">
<array>
<util:constant static-field="com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_SINGLE_QUOTES" />
</array>
</property>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
您可以执行以下操作(jackson版本<2):
自定义映射器类:
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
public class CustomObjectMapper extends ObjectMapper {
public CustomObjectMapper() {
super.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, true);
super.getSerializationConfig()
.setSerializationInclusion(JsonSerialize.Inclusion.NON_DEFAULT);
super.getSerializationConfig()
.set(SerializationConfig.Feature.INDENT_OUTPUT, false);
}
}
弹簧配置:
<mvc:annotation-driven>
<mvc:message-converters register-defaults="false">
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="objectMapper">
<bean class="package.CustomObjectMapper"/>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
对于使用基于Java的Spring配置的用户:
@Configuration
@ComponentScan(basePackages = "com.domain.sample")
@EnableWebMvc
public class SpringConfig extends WebMvcConfigurerAdapter {
....
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
final MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
final ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
converter.setObjectMapper(objectMapper);
converters.add(converter);
super.configureMessageConverters(converters);
}
....
}
如果要使用codehaus jackson映射器,请使用此映射器MappingJacksonHttpMessageConverter
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>${codehaus.jackson.version}</version>
</dependency>
org.codehaus.jackson
杰克逊地图绘制者
${codehaus.jackson.version}
没有回答这个问题,但这是谷歌的最热门搜索结果
如果有人来这里想为Spring4做这件事(就像我遇到的那样),你可以使用注释
@JsonInclude(Include.NON_NULL)
返回课堂。对于Spring版本4.1.3+ 我尝试了Jama的解决方案,但是所有的响应都返回了“application/json”内容类型,包括主生成的HTML页面 重写configureMessageConverters(…)会阻止spring设置默认转换器。Spring 4.1.3允许通过重写extendMessageConverters(…)修改已配置的转换器:
@配置
公共类转换器配置扩展WebMVCConfigureAdapter{
@凌驾
public void extendMessageConverters(列表转换器:转换器){
if(AbstractJackson2HttpMessageConverter的转换器实例){
AbstractJackson2HttpMessageConverter c=(AbstractJackson2HttpMessageConverter)转换器;
ObjectMapper ObjectMapper=c.getObjectMapper();
objectMapper.setSerializationInclusion(Include.NON_NULL);
}
}
超级扩展消息转换器(转换器);
}
}
请参阅org.springframework..WebMVC配置支持#getMessageConverters()
请参阅org.springframework..WebMvcConfigurationSupport#addDefaultHttpMessageConverters(…)
谢谢你,你的回答对我帮助很大。请看我的最终和工作配置的答案。好问题。我不知道我所采取的方法是否可行。这对我不起作用。得到这个“org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping:86 AbstractDetectingUrlHandlerMapp
@Configuration
@ComponentScan(basePackages = "com.domain.sample")
@EnableWebMvc
public class SpringConfig extends WebMvcConfigurerAdapter {
....
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
final MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
final ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
converter.setObjectMapper(objectMapper);
converters.add(converter);
super.configureMessageConverters(converters);
}
....
}
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>${codehaus.jackson.version}</version>
</dependency>
@JsonInclude(Include.NON_NULL)
@Configuration
public class ConverterConfig extends WebMvcConfigurerAdapter {
@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
for (HttpMessageConverter<?> converter : converters) {
if (converter instanceof AbstractJackson2HttpMessageConverter) {
AbstractJackson2HttpMessageConverter c = (AbstractJackson2HttpMessageConverter) converter;
ObjectMapper objectMapper = c.getObjectMapper();
objectMapper.setSerializationInclusion(Include.NON_NULL);
}
}
super.extendMessageConverters(converters);
}
}