HttpServletRequestWrapper.java

package cn.dreampie.common.web.handler.xss;

import org.apache.commons.lang3.StringEscapeUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by wangrenhui on 2014/6/25.
 */
public class HttpServletRequestWrapper extends javax.servlet.http.HttpServletRequestWrapper {

    public HttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    /**
     * 重写并过滤getParameter方法
     */
    @Override
    public String getParameter(String name) {
        return escapeAll(super.getParameter(name));
    }

    /**
     * 重写并过滤getParameterValues方法
     */
    @Override
    public String[] getParameterValues(String name) {
        String[] values = super.getParameterValues(name);
        if (null == values) {
            return null;
        }
        for (int i = 0; i < values.length; i++) {

            values[i] = escapeAll(values[i]);
        }
        return values;
    }

    /**
     * 重写并过滤getParameterMap方法
     */
    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> paramsMap = super.getParameterMap();
        // 对于paramsMap为空的直接return
        if (null == paramsMap || paramsMap.isEmpty()) {
            return paramsMap;
        }

        HashMap newParamsMap = new HashMap(paramsMap);
        for (Map.Entry<String, String[]> entry : paramsMap.entrySet()) {
            String key = entry.getKey();
            String[] values = entry.getValue();
            if (null == values) {
                continue;
            }
            String[] newValues = new String[values.length];
            for (int i = 0; i < values.length; i++) {
                newValues[i] = escapeAll(values[i]);
            }
            newParamsMap.put(key, values);
        }
        return Collections.unmodifiableMap(newParamsMap);
    }

    public String escapeAll(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = escapeString(value);
            value = escapeFile(value);
        }
        return value;
    }

    public String escapeString(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = escapeHtml(value);
        }
        return value;
    }

    public String escapeFile(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = escapeCsv(value);
            value = escapeXml(value);
        }
        return value;
    }

    public String escapeHtml(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = StringEscapeUtils.escapeHtml3(value);
            value = StringEscapeUtils.escapeHtml4(value);
        }
        return value;
    }

    public String escapeScript(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = StringEscapeUtils.escapeEcmaScript(value);
        }
        return value;
    }

    public String escapeCsv(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = StringEscapeUtils.escapeCsv(value);
        }
        return value;
    }

    public String escapeXml(String text) {

        String value = text;
        if (text == null) {
            return text;
        } else {
            value = StringEscapeUtils.escapeXml(value);
        }
        return value;
    }

}