数据结构C语言描述4(图文结合)--栈的实现,中序转后序表达式的实现

介绍

前台提交的请求参数，自动去除前后空格

配置代码

去除路径参数的前后空格

import org.springframework.beans.propertyeditors.StringTrimmerEditor;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.InitBinder;

@ControllerAdvice
public class GlobalControllerAdvice {

    /**
     * Get请求参数去除空格
     * @param binder
     */
    @InitBinder
    public void stringTrimmerEditor(WebDataBinder binder) {
        binder.registerCustomEditor(String.class,new StringTrimmerEditor(true));
    }

}

去除@RequestBody json的参数前后空格

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
import org.apache.commons.lang3.StringUtils;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;

@Configuration
public class AppConfig {

    /**
     * 注解@RequestBody中JSON或XML对象参数，去除空格
     * @return
     */
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return jacksonObjectMapperBuilder -> {
            // 为 String 类型自定义反序列化操作
            jacksonObjectMapperBuilder
                    .deserializerByType(String.class, new StdScalarDeserializer<String>(String.class) {
                        @Override
                        public String deserialize(JsonParser jsonParser, DeserializationContext ctx)
                                throws IOException {
                            // 去除前后空格
                            return StringUtils.trim(jsonParser.getValueAsString());
                        }
                    });
        };
    }

}