HelloController.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.shiro.samples;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.util.CollectionUtils;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.util.Collection;
import java.util.Map;

@Controller
public class HelloController {

    @SuppressWarnings("Duplicates")
    @RequestMapping("/")
    public String home(HttpServletRequest request, Model model) {

        String name = "World";

        Subject subject = SecurityUtils.getSubject();

        PrincipalCollection principalCollection = subject.getPrincipals();

        if (principalCollection != null && !principalCollection.isEmpty()) {
            Collection<Map> principalMaps = subject.getPrincipals().byType(Map.class);
            if (CollectionUtils.isEmpty(principalMaps)) {
                name = subject.getPrincipal().toString();
            }
            else {
                name = (String) principalMaps.iterator().next().get("username");
            }
        }

        model.addAttribute("name", name);

        return "hello";
    }

}