用Cactus测试Filter

用Cactus测试Filter

测试环境：Tomcat4,Cactus1.6.1

测试这样的一个Filter,它在用户登陆的时候根据客户端的信息（客户端类型，主机名）对用户身份作不同的认证。

 public void doFilter(ServletRequest srReq,ServletResponse srRes,
  FilterChain chain) throws ServletException, IOException {

  HttpServletRequest req = null;
  HttpServletResponse res = null;
  try {
   req = (HttpServletRequest) srReq;
   res = (HttpServletResponse) srRes;

   String browserType = getBrowserType(req.getHeader("User-Agent"));
   if (browserType.equals("F")) {
   log.debug("监视用客户端");
   return;
   }
              param = new NspAifa();
              req.setAttribute("_nsn_aifa", param.getAifaObject());
   // eAIFAに共通項目を設定
   String requestId = getRequestId(req);
   param.put(BasicAifa.REQUEST_ID, requestId);
   param.put(NspAifaKey.HT_AGENT, browserType);

   UserAgent userAgent = UserAgentFactory.getUserAgent(req, param);
   System.out.println(userAgent.getUrlMap());
   req.setAttribute("url", userAgent.getUrlMap());
   try {
    // ログイン中認証を行う
    userAgent.verify();
   } finally {
    // 認証失敗したとしても、可能な限り変数を取得する
    userAgent.exportParameters(param);
   }

   chain.doFilter(new ConvertRequestWrapper(req, param), res);
  } catch (SystemException e) {
   e.log(log, param);
   dispatchError(e, chain, req, res);
  } catch (SystemRuntimeException e) {
   e.log(log, param);
   dispatchError(e, chain, req, res);
  } catch (RuntimeException e) {
   sre.log(log, param);
   dispatchError(sre, chain, req, res);
  }
 }

    public static UserAgent getUserAgent(HttpServletRequest req,NspParameter param, int type)
        throws  DecryptException {
        String serverName = req.getServerName().toLowerCase();

        if (serverName.equals("www.host1.com")) {
            return new SecCodeUserAgent(req, param, type);
        } else if (serverName.equals("www.host2.com")) {
            return new DemoUserAgent(req, param, type);
        } else if (serverName.equals("www.host3.com")) {
            return new X509UserAgent(req, param, type);
        } else if (serverName.equals("www.host4.com")) {
            return new CugUserAgent(req, param, type);
        } else if (serverName.equals("www.host5.com")) {
            String agentName = req.getHeader("User-Agent");
            if ((agentName != null) && agentName.startsWith("DoCoMo/2")) {
                return new FomaUserAgent(req, param, type);
            }
            return new IModeUserAgent(req, param, type);
        } else if (serverName.equals("p246-1.jskypl.jp-t.ne.jp")) {
            return new JSkyUserAgent(req, param, type);
        } else if (serverName.equals("nst.kddi.ne.jp")) {
            return new EzWebUserAgent(req, param, type);
        } else if (serverName.equals("lmodet.ns.e.pipopa.ne.jp")) {
            return new LModeUserAgent(req, param, type);
        } else if (
            serverName.endsWith(".secure.bpr.nomura.co.jp")
                || serverName.endsWith(".intranet.jp.nomura.com")) {
            return new WOPUserAgent(req, param, type);
        } else if (log.isDebugEnabled()) {
            String agentName = req.getHeader("User-Agent");
            if (agentName.startsWith("DoCoMo/1")) {
                return new IModeUserAgent(req, param, type);
            } else if (agentName.startsWith("DoCoMo/2")) {
                return new FomaUserAgent(req, param, type);
            } else if (agentName.startsWith("J-PHONE")) {
                return new JSkyUserAgent(req, param, type);
            } else if (agentName.startsWith("Vodafone")) {
                return new JSkyUserAgent(req, param, type);
            }
        }
        throw new SystemRuntimeException(ErrorInfo.RT_UNKNOWN_HOST,new String[]{serverName});
    }

 在web.xml中的<web-app>标签中如下配置Filter：
 <filter>
  <filter-name>FilterRedirector</filter-name>
  <filter-class>org.apache.cactus.server.FilterTestRedirector</filter-class>
 </filter>
 <filter>
  <filter-name>NextFilter</filter-name>
  <filter-class>jp.co.nri.nsp.pl.NextFilter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>FilterRedirector</filter-name>
  <url-pattern>/FilterRedirector</url-pattern>
 </filter-mapping>
 <filter-mapping>
  <filter-name>NextFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 前面两个是Filter的声明,其中FilterRedirector是Cactus进行Filter测试所必需的,NextFilter是在测试Filter类的时候，

 首先定义一个beginXXX()方法，这个方法在Cactus模拟的客户端在ｒｅｑｕｅｓｔ里设置参数值，注意方法的参数的类型是org.apache.cactus.WebRequest。

 public final void beginDoFilterSecCodeUserAgent(final WebRequest req) {
  // 设定request头"User-Agent"
  req.addHeader("User-Agent", "Mozilla/4.0");
  // 设定request头"ServerName"
  req.addHeader("Host", "http://www.sum.com");
  // 设定request参数userName
  req.addParameter("userName", "Russell Crowe");
  // 设定request加密的参数password
  req.addParameter("password", Crypto.encrypt("123456"));
 }

除了字符串以外，WebRequest的addParameter方法无法将其他对象放进去,而他又没有像HttpServletRequest的setAttribute的方法，但是对于数组这种对象还是可以通过连续add相同key的方法在WebRequest中形成数组：
 req.addParameter("Key", "aaa");
 req.addParameter("Key", "bbb");
然後在testXXX()方法中可以将数组取出
 Map map = request.getParameterMap();
 String[] params = map.get("Key");
如果要放入对象，可以在testXXX里写
 //把一个对象放到request里
 Object o = new Object();
 super.request.setAttribute(o);
注意不要将null放进去，否则会引发NullPointer异常。
在setup方法中实例化被测试类：
 public final void setUp() throws Exception {
  testClass = new XXXFilter();
  testClass.init(config);
 }
测试doFilter方法：
 public final void testDoFilterSecCodeUserAgent() {
  testClass.doFilter();
 }

注意1：addParameter方法无法将null放进去，否则会引发NullPointer异常
注意2：如果被测Class程序流程受静态变量影响，则无法在单个测试Class中测试所有的分支，需要分多个Class
注意3：如果测试过程中有需要修改Properties的Case的话，只能将每个此类的Case放到单独的测试类中测试,Tomcat在Cactus执行同一测试类的时候无法将Properties文件重新加载