配置全局对long类型的精度处理机制

ktg-framework/src/main/java/com/ktg/framework/config/WebMvcConfig.java

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+package com.ktg.framework.config;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+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.Configuration;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.StringHttpMessageConverter;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import java.util.List;
+
+@Configuration
+@EnableWebMvc
+public class WebMvcConfig implements WebMvcConfigurer {
+
+    @Override
+    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
+        // 配置StringHttpMessageConverter（如果需要的话）
+        converters.add(new StringHttpMessageConverter());
+
+        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
+        builder.serializationInclusion(JsonInclude.Include.NON_NULL);
+        ObjectMapper objectMapper = builder.build();
+
+        SimpleModule simpleModule = new SimpleModule();
+        // 为Long类型注册ToStringSerializer，将其序列化为字符串
+        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
+        objectMapper.registerModule(simpleModule);
+
+        // 将配置好的ObjectMapper添加到MappingJackson2HttpMessageConverter中
+        converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
+
+        // 如果继承了其他WebMvcConfigurer实现类，可以调用super.configureMessageConverters(converters);
+        // 但在这个例子中，我们并没有继承其他实现类，所以不需要调用
+    }
+}