SpringBoot配置抵御XSS工具

原理略解：防止夸脚本工具，主要是讲客户端请求的内容进行过滤处理
使用HttpServletRequestWrapper 包装器对请求的内容进行过滤处理
注意：maven需要导入Hutool库
XssHttpServletRequestWrapper过滤类

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
    public XssHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getParameter(String name) {
        String value = super.getParameter(name);
        if (!StrUtil.hasEmpty(value)) {
            // 转义字符
            value = HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] values = super.getParameterValues(name);
        if (values != null) {
            for (int i = 0; i < values.length; i++) {
                String value = values[i];
                if (!StrUtil.hasEmpty(value)) {
                    // 转义字符
                    value = HtmlUtil.filter(value);
                }
                values[i] = value;
            }
        }
        return values;
    }

    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> parameters = super.getParameterMap();
        LinkedHashMap<String, String[]> map = new LinkedHashMap<>();
        if (parameters != null) {
            for (String key : parameters.keySet()) {
                String[] values = parameters.get(key);
                for (int i = 0; i < values.length; i++) {
                    String value = values[i];
                    if (!StrUtil.hasEmpty(value)) {
                        // 转义字符
                        value = HtmlUtil.filter(value);
                    }
                    values[i] = value;
                }
                map.put(key, values);
            }
        }
        return map;
    }

    @Override
    public String getHeader(String name) {
        String header = super.getParameter(name);
        if (!StrUtil.hasEmpty(header)) {
            // 转义字符
            header = HtmlUtil.filter(header);
        }
        return header;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        StringBuffer body = new StringBuffer();
        ServletInputStream sis = super.getInputStream();
        InputStreamReader isr = new InputStreamReader(sis, Charset.forName("UTF-8"));
        BufferedReader br = new BufferedReader(isr);
        String line = br.readLine();
        while (line != null) {
            body.append(line);
            line = br.readLine();
        }
        br.close();
        isr.close();
        sis.close();
        Map<String, Object> map = JSONUtil.parseObj(body.toString());
        Map<String, Object> resultMap = new HashMap<>(map.size());

        for (String key : map.keySet()) {
            Object value = map.get(key);
            if (value instanceof String) {
                String val = HtmlUtil.filter(value.toString());
                resultMap.put(key, val);
            } else {
                resultMap.put(key, value);
            }
        }
        String str = JSONUtil.toJsonStr(resultMap);
        ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(str.getBytes());
        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }

            @Override
            public int read() throws IOException {
                return arrayInputStream.read();
            }
        };
    }
}

设置过滤器，这里没有使用@Bean的方式

@WebFilter(urlPatterns = "/*")
public class XssFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        XssHttpServletRequestWrapper wrapper = new XssHttpServletRequestWrapper(request);
        filterChain.doFilter(wrapper, servletResponse);
    }

    @Override
    public void destroy() {

    }
}

主启动类加上@ServletComponentScan让自定义过滤器生效