关于使用<@shiro.principal />标签报错bug！

[JodenHe]

在使用<@shiro.principal />报错误，后面看了看源码好像有一个PrincipalTag.java里面使用了一个没有的Model类导致的！在项目中我使用了freemarker-shiro的源码替换了，希望作者可以优化一下代码 代码如下： package cn.dreampie.shiro.freemarker;

import freemarker.core.Environment; import freemarker.log.Logger; import freemarker.template.TemplateDirectiveBody; import freemarker.template.TemplateException; import freemarker.template.TemplateModelException;

import java.beans.BeanInfo; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.io.IOException; import java.util.Map;

/**

• used to print out the String value of a user's default principal,
• or a specific principal as specified by the tag's attributes.

• no attributes are specified, the tag prints out the toString()
• value of the user's default principal. If the type attribute
• is specified, the tag looks for a principal with the given type. If the
• property attribute is specified, the tag prints the string value of
• the specified property of the principal. If no principal is found or the user
• is not authenticated, the tag displays nothing unless a defaultValue
• is specified.

• Equivalent to {@link org.apache.shiro.web.tags.PrincipalTag}

• @since 0.2 */ public class PrincipalTag extends SecureTag { static final Logger log = Logger.getLogger("PrincipalTag");

  /**

  • The type of principal to be retrieved, or null if the default principal should be used. */ String getType(Map params) { return getParam(params, "type"); }

  /**

  • The property name to retrieve of the principal, or null if the toString() value should be used. */ String getProperty(Map params) { return getParam(params, "property"); }

  @SuppressWarnings("unchecked") @Override public void render(Environment env, Map params, TemplateDirectiveBody body) throws IOException, TemplateException { String result = null;

  if (getSubject() != null) {
      // Get the principal to print out
      Object principal;
  
      if (getType(params) == null) {
          principal = getSubject().getPrincipal();
      } else {
          principal = getPrincipalFromClassName(params);
      }
  
      // Get the string value of the principal
      if (principal != null) {
          String property = getProperty(params);
  
          if (property == null) {
              result = principal.toString();
          } else {
              result = getPrincipalProperty(principal, property);
          }
      }
  }
  
  // Print out the principal value if not null
  if (result != null) {
      try {
          env.getOut().write(result);
      } catch (IOException ex) {
          throw new TemplateException("Error writing ["+result+"] to Freemarker.", ex, env);
      }
  }

  }

  @SuppressWarnings("unchecked") Object getPrincipalFromClassName(Map params) { String type = getType(params);

  try {
      Class cls = Class.forName(type);
  
      return getSubject().getPrincipals().oneByType(cls);
  } catch (ClassNotFoundException ex) {
      log.error("Unable to find class for name ["+type+"]", ex);
  }
  
  return null;

  }

  String getPrincipalProperty(Object principal, String property) throws TemplateModelException { try { BeanInfo beanInfo = Introspector.getBeanInfo(principal.getClass());

      // Loop through the properties to get the string value of the specified property
      for (PropertyDescriptor propertyDescriptor : beanInfo.getPropertyDescriptors()) {
          if (propertyDescriptor.getName().equals(property)) {
              Object value = propertyDescriptor.getReadMethod().invoke(principal, (Object[]) null);
  
              return String.valueOf(value);
          }
      }
  
      // property not found, throw
      throw new TemplateModelException("Property ["+property+"] not found in principal of type ["+principal.getClass().getName()+"]");
  } catch (Exception ex) {
      throw new TemplateModelException("Error reading property ["+property+"] from principal of type ["+principal.getClass().getName()+"]", ex);
  }

  } }

[Dreampie]

把具体的异常提交上来吧？

[JodenHe]

[ERROR]-[Thread: qtp1286084959-16]-[com.jfinal.core.ActionHandler.handle()]: / java.lang.NoClassDefFoundError: cn/dreampie/web/model/Model at cn.dreampie.shiro.freemarker.PrincipalTag.render(PrincipalTag.java:66) at cn.dreampie.shiro.freemarker.SecureTag.execute(SecureTag.java:17) at freemarker.core.Environment.visit(Environment.java:341) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:136) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment$1.render(Environment.java:313) at cn.dreampie.shiro.freemarker.SecureTag.renderBody(SecureTag.java:41) at cn.dreampie.shiro.freemarker.UserTag.render(UserTag.java:32) at cn.dreampie.shiro.freemarker.SecureTag.execute(SecureTag.java:17) at freemarker.core.Environment.visit(Environment.java:341) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:136) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.process(Environment.java:243) at freemarker.template.Template.process(Template.java:277) at com.jfinal.render.FreeMarkerRender.render(FreeMarkerRender.java:145) at com.jfinal.core.ActionHandler.handle(ActionHandler.java:97) at com.jfinal.ext.handler.ContextPathHandler.handle(ContextPathHandler.java:47) at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:560) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:365) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassNotFoundException: cn.dreampie.web.model.Model at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:430) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:383) ... 58 more

[JodenHe]

主要错误：java.lang.NoClassDefFoundError: cn/dreampie/web/model/Model

[Dreampie]

这应该是依赖包不全的问题，可用参照这个项目 使用 jfinal-dreampie 插件包，https://github.com/Dreampie/jfinal-demo