利用Filter过滤关键字

最新推荐文章于 2022-10-20 20:12:17 发布

原创最新推荐文章于 2022-10-20 20:12:17 发布 · 323 阅读

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CC 4.0 BY-SA版权

文章标签：

#java #servlet #开发语言 #java-ee #后端

这篇博客介绍了如何在Java后端开发中利用Filter机制，通过text.contains()方法查找包含特定关键字的字符串，并用text.replace()进行替换操作。

部署运行你感兴趣的模型镜像

@WebFilter("/FilterController")
public class Filter01 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;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        String text = request.getParameter("text");
        InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("guanjianci.Properties");
        Properties properties = new Properties();
        properties.load(resourceAsStream);
        Collection<Object> values = properties.values();
        String temp = "";
       for (Object value : values) {
            String s = (String) value;
            if (text.contains(s)){
                for (int i = 0; i < s.length(); i++) {
                    temp+="*";
                }
                String replace = text.replace(s, temp);
                text = replace;
            }
        }
        request.setAttribute("text",text);
        System.out.println(text);
        filterChain.doFilter(request,response);
    }
    @Override
    public void destroy() {

    }
}

利用 text.contains(s) 查找出包含关键字的字符串

然后利用 text.replace(s, temp) 替换即可

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