添加一个默认的时间转化器，用在String->Date

src/main/java/cn/stylefeng/guns/config/web/String2DateConfig.java

+package cn.stylefeng.guns.config.web;
+
+import cn.hutool.core.date.DateUtil;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.core.convert.support.GenericConversionService;
+import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
+import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
+
+import javax.annotation.PostConstruct;
+import java.util.Date;
+
+/**
+ * 默认的string to date的转化
+ *
+ * @author fengshuonan
+ * @Date 2019/2/12 20:09
+ */
+@Configuration
+public class String2DateConfig {
+
+    @Autowired
+    private RequestMappingHandlerAdapter handlerAdapter;
+
+    /**
+     * 默认时间转化器
+     */
+    @PostConstruct
+    public void addConversionConfig() {
+        ConfigurableWebBindingInitializer initializer = (ConfigurableWebBindingInitializer) handlerAdapter.getWebBindingInitializer();
+        if ((initializer != null ? initializer.getConversionService() : null) != null) {
+            GenericConversionService genericConversionService = (GenericConversionService) initializer.getConversionService();
+            genericConversionService.addConverter(new StringToDateConverter());
+        }
+    }
+
+    public class StringToDateConverter implements Converter<String, Date> {
+        @Override
+        public Date convert(String dateString) {
+            return DateUtil.parse(dateString);
+        }
+    }
+
+}