返回给前端的json，long转string

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package com.zhidianfan.ydusermanager.config;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.web.PageableHandlerMethodArgumentResolver;
import org.springframework.http.converter.ByteArrayHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.ResourceHttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import java.util.List;
/** * @Author sherry * @Description * @Date Create in 2019-03-15 * @Modified By: */
@Configuration
public class WebConfig extends WebMvcConfigurationSupport { 

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 

converters.add(new ByteArrayHttpMessageConverter());
converters.add(new StringHttpMessageConverter());
converters.add(new ResourceHttpMessageConverter());
converters.add(new AllEncompassingFormHttpMessageConverter());
converters.add(new StringHttpMessageConverter());
converters.add(longToStringConverter());
}
/** * 将返回给前端的Long和long，统一转化成字符串 * * @return */
@Bean
public MappingJackson2HttpMessageConverter longToStringConverter() { 

MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
ObjectMapper mapper = new ObjectMapper();
SimpleModule simpleModule = new SimpleModule();
simpleModule.addSerializer(Long.class, ToStringSerializer.instance);//Long
simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);//long
mapper.registerModule(simpleModule);
converter.setObjectMapper(mapper);
return converter;
}
/** * 必须加上，否则Controller中的分页参数对象无法实例化 * * @param argumentResolvers */
@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) { 

// 注册Spring data jpa pageable的参数分解器
argumentResolvers.add(new PageableHandlerMethodArgumentResolver());
}
}