yunsu/cloud-model/src/main/java/com/hssx/cloudmodel/util/EmojiHttpServletRequestWraper.java

package com.hssx.cloudmodel.util;

import com.baomidou.mybatisplus.core.toolkit.StringUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;


public class EmojiHttpServletRequestWraper extends HttpServletRequestWrapper {

    public EmojiHttpServletRequestWraper(HttpServletRequest request) {
        super(request);
    }
    
    @Override
    public String getParameter(String name) {
        return filterEmoji(super.getParameter(name));
    }
    
    @Override
    public String getHeader(String name) {
        return filterEmoji(super.getParameter(name));
    }
    
    
    
    @Override
    public String[] getParameterValues(String name) {
        System.out.println("getParameterValues----->转义处理:"+name);
        if(!StringUtils.isEmpty(name)){
            String[] values = super.getParameterValues(name);
            if(values != null ){
            	if(values.length > 0) {
            		String[] newValues = new String[values.length];
            		
            		for(int i =0; i< values.length; i++){
            			if (containsEmoji(values[i])) {
            				System.out.println("包含emoji:"+values[i]);
            				newValues[i] = filterEmoji(values[i]);
            				System.out.println("包含emoji,处理后:"+newValues[i]);
            			} else {
            				newValues[i] = values[i];
            			}
            		}
            		return newValues;
            	}
            } 
        }
        return null;
    }

    
    public static boolean containsEmoji(String source) {
        if (StringUtils.isEmpty(source)) {
            return false;
        }

        int len = source.length();

        for (int i = 0; i < len; i++) {
            char codePoint = source.charAt(i);

            if (isEmojiCharacter(codePoint)) {
                //do nothing，判断到了这里表明，确认有表情字符
                return true;
            }
        }

        return false;
    }

    private static boolean isEmojiCharacter(char codePoint) {
        return (codePoint == 0x0) || 
                (codePoint == 0x9) ||                            
                (codePoint == 0xA) ||
                (codePoint == 0xD) ||
                ((codePoint >= 0x20) && (codePoint <= 0xD7FF)) ||
                ((codePoint >= 0xE000) && (codePoint <= 0xFFFD)) ||
                ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));
    }

    /**
     * 过滤emoji 或者 其他非文字类型的字符
     * @param source
     * @return
     */
    public static String filterEmoji(String source) {
    	if (source == null || "".equals(source)) {
    		return source;
    	}
    	System.out.println("过滤 = "+source);
        source = source.replaceAll("[\\ud800\\udc00-\\udbff\\udfff\\ud800-\\udfff]", "*");
        if (!containsEmoji(source)) {
            return source;//如果不包含，直接返回
        }
        //到这里铁定包含
        StringBuilder buf = null;

        int len = source.length();

        for (int i = 0; i < len; i++) {
            char codePoint = source.charAt(i);

            if (isEmojiCharacter(codePoint)) {
                if (buf == null) {
                    buf = new StringBuilder(source.length());
                }

                buf.append(codePoint);
            } else {
                buf.append("*");
            }
        }

        if (buf == null) {
            return source;//如果没有找到 emoji表情，则返回源字符串
        } else {
            if (buf.length() == len) {//这里的意义在于尽可能少的toString，因为会重新生成字符串
                buf = null;
                return source;
            } else {
                return buf.toString();
            }
        }

    }
}