springSecurity 添加自定义过滤器
我们知道，springSecurity其实就是将过滤器和aop进行整合。其实我们也可以添加自己的过滤器。
很简单，配置如下
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<http use-expressions="false" entry-point-ref="loginEntryPoint"> <intercept-url pattern="/user.jsp" access="ROLE_USER,ROLE_ADMIN"/> <intercept-url pattern="/admin.jsp" access="ROLE_ADMIN"/> <intercept-url pattern="/**" access="IS_AUTHENTICATED_FULLY"/> <form-login/> <custom-filter ref="myFilter" position="LAST"/> </http> <beans:bean id="myFilter" class="com.ezhiyang.springSecurity.MyFilter"/> |
然后再来看看myFilter
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public class MyFilter implements Filter{ @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("进来了我自定义的过滤器了"); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { System.out.println("自定义过滤器链销毁了"); }} |
其实只要实现了javax.servlet.Filter就可以了，很low.
springSecurity 自定义认证过滤器
继承 Filter 基类 OncePerRequestFilter 保证每个请求转发执行一次
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public class MyAuthenticationProcessingFilter extends OncePerRequestFilter { protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { filterChain.doFilter(requestWrapper, response); } |
出现的问题
在 filter 中消费了 Request 中的 InputStream 导致后续的过滤器中无法调用 Request
解决方法
定义一个 HttpServletRequestWrapper 类，将输入流字节数据读取出来，以供使用，重新 getInputStream() 方法，将输入流字节数组重新封装成 ServletInputStream 输入流即可，注意字符编码
ServletRequestWrapper.java
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public class ServletRequestWrapper extends HttpServletRequestWrapper { private byte[] body; private String requestParam; /** * Constructs a request object wrapping the given request. * @Description: 将 request 中的流信息读取出来供外部使用，将流缓存起来，传到下一个 filter 中 * @param request The request to wrap * @throws IllegalArgumentException if the request is null */ public ServletRequestWrapper(HttpServletRequest request) { super(request); requestParam = HttpUtil.getBodyString(request); body = requestParam.getBytes(Charset.forName("utf-8")); } @Override public BufferedReader getReader() throws IOException { return new BufferedReader(new InputStreamReader(getRequest().getInputStream(), Charset.forName("UTF-8"))); } @Override public ServletInputStream getInputStream() throws IOException { return new CustomServletInputStream(); } private class CustomServletInputStream extends ServletInputStream { private ByteArrayInputStream inputStream = new ByteArrayInputStream(body); @Override public boolean isFinished() { return false; } @Override public boolean isReady() { return false; } @Override public void setReadListener(ReadListener listener) { } @Override public int read() throws IOException { return inputStream.read(); } } public String getRequestParam() { return requestParam; }} |
HttpUtil.java
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public class HttpUtil { public static String getBodyString(ServletRequest request) { BufferedReader bufferedReader = null; InputStream inputStream = null; StringBuilder sb = new StringBuilder(""); try { inputStream = request.getInputStream(); bufferedReader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("utf-8"))); String line = ""; while ((line = bufferedReader.readLine()) != null) { sb.append(line); } } catch (IOException e) { e.printStackTrace(); } finally { if (bufferedReader != null) { try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return sb.toString(); }} |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/weixin_41751625/article/details/79846581
