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springSecurity之如何添加自定義過濾器

更新時(shí)間：2021年08月26日 11:13:21 作者：虎哥和你一起學(xué)編程

這篇文章主要介紹了springSecurity之如何添加自定義過濾器的操作，具有很好的參考價(jià)值，希望對大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

springSecurity 添加自定義過濾器

我們知道，springSecurity其實(shí)就是將過濾器和aop進(jìn)行整合。其實(shí)我們也可以添加自己的過濾器。

很簡單，配置如下

<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"/>

然后再來看看myFilter

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("進(jìn)來了我自定義的過濾器了");
        filterChain.doFilter(servletRequest,servletResponse);
    }
 
    @Override
    public void destroy() {
        System.out.println("自定義過濾器鏈銷毀了");
    }
}

其實(shí)只要實(shí)現(xiàn)了javax.servlet.Filter就可以了，很low.

springSecurity 自定義認(rèn)證過濾器

繼承 Filter 基類 OncePerRequestFilter 保證每個(gè)請求轉(zhuǎn)發(fā)執(zhí)行一次

public class MyAuthenticationProcessingFilter extends OncePerRequestFilter {
  protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
      throws ServletException, IOException {
    filterChain.doFilter(requestWrapper, response);
  }

出現(xiàn)的問題

在 filter 中消費(fèi)了 Request 中的 InputStream 導(dǎo)致后續(xù)的過濾器中無法調(diào)用 Request

解決方法

定義一個(gè) HttpServletRequestWrapper 類，將輸入流字節(jié)數(shù)據(jù)讀取出來，以供使用，重新 getInputStream() 方法，將輸入流字節(jié)數(shù)組重新封裝成 ServletInputStream 輸入流即可，注意字符編碼

ServletRequestWrapper.java

public class ServletRequestWrapper extends HttpServletRequestWrapper {
  private byte[] body;
  private String requestParam;
  /**
   * Constructs a request object wrapping the given request.
   * @Description: 將 request 中的流信息讀取出來供外部使用，將流緩存起來，傳到下一個(gè) 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

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();
  }
}

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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