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

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


             
                  
                       
                            
                                 
                                  
                                  
                                  
           
           
            NON_NULL
            
                                  
           
            
            
                              
                         
                        
                            
                                 
          
           text/html;charset=UTF-8
                                  
          
           application/json; charset=UTF-8

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();    }}