一、测试反射型XSS漏洞例子：

        在get方法带上参数如 id=%27-prompt(1)-%27

二、修复建议：

        过滤输入，html编码输出

三、修复方法：

        增加过滤器，并在web.xml中注册

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;


public class XssFilter implements Filter {
    FilterConfig filterConfig = null;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    @Override
    public void destroy() {
        this.filterConfig = null;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain) throws IOException, ServletException {
        chain.doFilter(new XssHttpServletRequestWrapper(
                (HttpServletRequest) request), response);
    }
}

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


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

    @Override
    public String[] getParameterValues(String parameter) {
        String[] values = super.getParameterValues(parameter);
        if (values == null) {
            return null;
        }
        int count = values.length;
        String[] encodedValues = new String[count];
        for (int i = 0; i < count; i++) {
            encodedValues[i] = cleanXSS(values[i]);
        }
        return encodedValues;
    }

    @Override
    public String getParameter(String parameter) {
        String value = super.getParameter(parameter);
        if (value == null) {
            return null;
        }
        return cleanXSS(value);
    }

    @Override
    public String getHeader(String name) {
        String value = super.getHeader(name);
        if (value == null) {
            return null;
        }
        return cleanXSS(value);
    }

    private String cleanXSS(String value) {
        //You'll need to remove the spaces from the html entities below
        value = value.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
        value = value.replaceAll("\\(", "&#40;").replaceAll("\\)", "&#41;");
        value = value.replaceAll("'", "&#39;");
        value = value.replaceAll("eval\\((.*)\\)", "");
        value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
        value = value.replaceAll("script", "");
        value = value.replaceAll("\\.\\./", "");
        return value;
    }
}

<filter>
   <filter-name>XssSqlFilter</filter-name>
    <!-- 修改为自己的包路径 -->
   <filter-class>com.xxx.filter.XssFilter</filter-class>
</filter>
<filter-mapping>
   <filter-name>XssSqlFilter</filter-name>
   <url-pattern>/*</url-pattern>
   <dispatcher>REQUEST</dispatcher>
</filter-mapping>