springmvc配置MappingJackson2HttpMessageConverter实现属性驼峰和下划线的转换

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需求

php调用java接口时，因为php那边的属性都是下划线风格，java这边的属性都是驼峰的风格。配置springmvc的json转换，在requestBody的时候（调用对象的set 方法）将java属性name映射成下划线形式和请求的参数匹配；在responseBody的时候（调用对象的get方法）将java的属性name也映射成下划线形式。

MappingJackson2HttpMessageConverter配置

<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="com.fasterxml.jackson.databind.ObjectMapper">



<property name="serializationInclusion">
<value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
</property>
<property name="propertyNamingStrategy">

<bean class="com.fasterxml.jackson.databind.PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy" />
</property>
</bean>
</property>
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json; charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>

自定义PropertyNamingStrategy

import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.introspect.AnnotatedField;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.fasterxml.jackson.databind.introspect.AnnotatedParameter;
import org.apache.commons.lang3.StringUtils;/**
* Created by hujunzheng on 2017/6/7.
*/
public class MyPropertyNamingStrategyBase extends PropertyNamingStrategy { @Override
public String nameForField(MapperConfig<?> config, AnnotatedField field, String defaultName) {
return defaultName;
} @Override
public String nameForGetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) {
return underscoreName(defaultName);
} @Override
public String nameForSetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) {
return underscoreName(defaultName);
} @Override
public String nameForConstructorParameter(MapperConfig<?> config, AnnotatedParameter ctorParam,
String defaultName) {
return defaultName;
} private String underscoreName(String name) {
if (StringUtils.isEmpty(name)) {
return "";
}
StringBuilder result = new StringBuilder();
result.append(name.substring(0, 1).toLowerCase());
for (int i = 1; i < name.length(); ++i) {
String s = name.substring(i, i + 1);
String slc = s.toLowerCase();
if (!(s.equals(slc))) {
result.append("_").append(slc);
} else {
result.append(s);
}
}
return result.toString();
} private String withoutUnderscoreName(String name) {
if (StringUtils.isEmpty(name)) {
return "";
}
StringBuilder result = new StringBuilder();
result.append(name.substring(0, 1).toLowerCase());
boolean underscore = false;
for (int i = 1; i < name.length(); ++i) {
String s = name.substring(i, i + 1);
if ("_".equals(s)) {
underscore = true;
continue;
} else {
if (underscore) s = s.toUpperCase();
underscore = false;
}
result.append(s);
}
return result.toString();
}
}