标签功能

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<div class="form-group">
                    <label for="tag">添加标签:</label>
                    <input type="text" class="form-control" id="tag" th:value="${tag}" name="tag"
                           placeholder="输入标签,以逗号分隔..." autocomplete="off">
                    <div id="select-tag" class="publish-tag-tab">
                        <ul class="nav nav-tabs" role="tablist">
                            <li role="presentation" th:each="selectCategory,selectCategoryStat:${tags}" th:class="${selectCategoryStat.first ? 'active':''}">
                                <a th:href="${'#'+selectCategory.categoryName}" aria-controls="home" role="tab"
                                   data-toggle="tab" th:text="${selectCategory.categoryName}">
                                </a>
                            </li>
                        </ul>
                        <div class="tab-content">
                            <div role="tabpanel"  th:id="${selectCategory.categoryName}"
                                 th:each="selectCategory:${tags}" th:class="${selectCategoryStat.first ? 'active tab-pane':'tab-pane'}">
                                <span class="label label-info" th:each="selectTag:${selectCategory.tags}">
                                    <span class="glyphicon glyphicon-tags" onclick="selectTag(this)" th:data-tag="${selectTag}"
                                          th:text="${' '+selectTag}"></span>
                                </span>
                            </div>
                        </div>
                    </div>
                </div>

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//显示标签框
/*function showSelectTag() {
    $("select-tag").show();失效，和luntang.css的 display: none;  冲突！
}*/
/*选择标签*/
function selectTag(e){
    var value=e.getAttribute("data-tag");
    var previous=$("#tag").val();//先获取原有的值
    if(previous.indexOf(value)==-1){//先判断value标签是否存在
        if(previous){//previous不为空null
            $("#tag").val(previous+','+value);
        }else {
            $("#tag").val(value);
        }
    }
}

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.publish-tag-tab{
    /*display: none;  隐藏 */
    margin-top:10px;
    padding-top: 10px;
}
.publish-tag-tab .label-info{
    white-space: normal;
    margin: 5px 5px;
    display: inline-block;
}

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package xgl.cache;

import org.apache.commons.lang3.StringUtils;
import xgl.dto.TagDTO;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class TagCache {
    public static List<TagDTO> get() {
        List<TagDTO> tagDTOS = new ArrayList<>();
        TagDTO program = new TagDTO();
        program.setCategoryName("开发语言");
        program.setTags(Arrays.asList("javascript", "php", "css", "html", "html5", "java", "node.js", "python", "c++", "c", "golang", "objective-c", "typescript", "shell", "swift", "c#", "sass", "ruby", "bash", "less", "asp.net", "lua", "scala", "coffeescript", "actionscript", "rust", "erlang", "perl"));
        tagDTOS.add(program);

        TagDTO framework = new TagDTO();
        framework.setCategoryName("平台框架");
        framework.setTags(Arrays.asList("laravel", "spring", "express", "django", "flask", "yii", "ruby-on-rails", "tornado", "koa", "struts"));
        tagDTOS.add(framework);


        TagDTO server = new TagDTO();
        server.setCategoryName("服务器");
        server.setTags(Arrays.asList("linux", "nginx", "docker", "apache", "ubuntu", "centos", "缓存 tomcat", "负载均衡", "unix", "hadoop", "windows-server"));
        tagDTOS.add(server);

        TagDTO db = new TagDTO();
        db.setCategoryName("数据库");
        db.setTags(Arrays.asList("mysql", "redis", "mongodb", "sql", "oracle", "nosql memcached", "sqlserver", "postgresql", "sqlite"));
        tagDTOS.add(db);

        TagDTO tool = new TagDTO();
        tool.setCategoryName("开发工具");
        tool.setTags(Arrays.asList("git", "github", "visual-studio-code", "vim", "sublime-text", "xcode intellij-idea", "eclipse", "maven", "ide", "svn", "visual-studio", "atom emacs", "textmate", "hg"));
        tagDTOS.add(tool);
        return tagDTOS;
    }

    public static String filterInvalid(String tags) {//找出无效的标签
        String[] split = StringUtils.split(tags, ",");
        List<TagDTO> tagDTOS = get();

        List<String> tagList = tagDTOS.stream().flatMap(tag -> tag.getTags().stream()).collect(Collectors.toList());
        String invalid = Arrays.stream(split).filter(t -> StringUtils.isBlank(t) || !tagList.contains(t)).collect(Collectors.joining(","));
        return invalid;
    }

    public static void main(String[] args) {
        int i = (5 - 1) >>> 1;
        System.out.println(i);
    }
}