Java解决xss转义导致转码的问题

package com.wssnail.xss.config;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.text.StringEscapeUtils;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import java.io.IOException;
import java.util.List;
import java.util.ListIterator;
/**
 * @author 熟透的蜗牛
 * @version 1.0
 * @description: 配置xss攻击过滤
 * @date 2023/8/14 23:48
 */
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> messageConverters) {
        /**
         * 替换默认的MappingJackson2HttpMessageConverter，过滤(json请求参数)xss
         */
        ListIterator<HttpMessageConverter<?>> listIterator = messageConverters.listIterator();
        while (listIterator.hasNext()) {
            HttpMessageConverter<?> next = listIterator.next();
            if (next instanceof MappingJackson2HttpMessageConverter) {
                listIterator.remove();
                break;
            }
        }
        messageConverters.add(getMappingJackson2HttpMessageConverter());
    }
    public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
        // 创建自定义ObjectMapper
        SimpleModule module = new SimpleModule();
        module.addDeserializer(String.class, new JsonHtmlXssDeserializer(String.class));
        ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().applicationContext(this.getApplicationContext()).build();
        objectMapper.registerModule(module);
        // 创建自定义消息转换器
        MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        mappingJackson2HttpMessageConverter.setObjectMapper(objectMapper);
        return mappingJackson2HttpMessageConverter;
    }
    /**
     * 添加默认请求类型
     */
    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.ignoreAcceptHeader(true).
                defaultContentType(MediaType.APPLICATION_JSON, MediaType.TEXT_XML, MediaType.APPLICATION_XML);
    }
}
/**
 * @author 熟透的蜗牛
 * @version 1.0
 * @description: 对xss进行过滤
 * @date 2023/8/14 23:49
 */
class JsonHtmlXssDeserializer extends JsonDeserializer<String> {
    public JsonHtmlXssDeserializer(Class<String> string) {
        super();
    }
    @Override
    public Class<String> handledType() {
        return String.class;
    }
    @Override
    public String deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
            throws IOException {
        String value = jsonParser.getValueAsString();
        if (!StringUtils.isEmpty(value)) {
            return StringEscapeUtils.escapeHtml4(value);
        }
        return value;
    }
}

package com.wssnail.xss.annotation;
import java.lang.annotation.*;
@Target({ElementType.TYPE,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface StringEscapeCode {
}

package com.wssnail.xss.utils;
import com.wssnail.xss.annotation.StringEscapeCode;
import org.apache.commons.text.StringEscapeUtils;
import java.lang.reflect.Field;
/**
 * @author 熟透的蜗牛
 * @version 1.0
 * @description: 配置字符串格式文本处理工具
 * @date 2023/8/14 23:50
 */
public class StringEscapeCodeUtil {
    public static void stringEscape(Class<?> clazz, Object obj) throws IllegalAccessException {
        StringEscapeCode declaredAnnotation = clazz.getDeclaredAnnotation(StringEscapeCode.class);
        if (declaredAnnotation != null) {
            Field[] fields = clazz.getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                if (fields[i].getGenericType().toString().endsWith("String")) {
                    //有注解，设置字段
                    fields[i].setAccessible(true);
                    String value = StringEscapeUtils.unescapeHtml4((String) fields[i].get(obj));
                    fields[i].set(obj, value);
                }
            }
        } else {
            Field[] fields = clazz.getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                StringEscapeCode annotation = fields[i].getAnnotation(StringEscapeCode.class);
                if (fields[i].getGenericType().toString().endsWith("String")) {
                    if (annotation != null) {
                        //有注解，设置字段
                        fields[i].setAccessible(true);
                        String value = StringEscapeUtils.unescapeHtml4((String) fields[i].get(obj));
                        fields[i].set(obj, value);
                    }
                }
            }
        }
    }
}

package com.wssnail.xss.annotation;
import java.lang.annotation.*;
/**
 * @author 熟透的蜗牛
 * @version 1.0
 * @description: 自定义注解
 * 使用方法  将该注解添加到类上，或者属性上，只有作用在、string类型的属性上，注解才会生效
 * @date 2023/8/15 0:13
 */
@Target({ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface StringEscapeCode {
}

 public User getById(Integer id) {
        try {
            User user = userMapper.findByID(id);
            Class<? extends User> clazz = user.getClass();
            StringEscapeCodeUtil.unStringEscape(clazz, user);
            return user;
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }