问题描述
freemarker 自定义指令，需要实现TemplateDirectiveModel 类中的 public void execute(Environment env, Map params, TemplateModel[] loopVars,TemplateDirectiveBody body) throws TemplateException, IOException 方法，改方法中的TemplateModel[] loopVars 怎么用呢？网上搜了半天也没看明白，请问这个参数怎么用，最好给个例子
解决方案
给你一个例子public class OperatorDirective implements TemplateDirectiveModel{@Overridepublic void execute(Environment env, Map params, TemplateModel[] arg2,TemplateDirectiveBody body) throws TemplateException, IOException {String code = null;String roleId = null; if(params.get("code") != null){SimpleScalar codeSimpleScalar = (SimpleScalar)params.get("code");code = codeSimpleScalar.getAsString();}if(params.get("roleId") != null){SimpleScalar roleIdSimpleScalar = (SimpleScalar)params.get("roleId");roleId = roleIdSimpleScalar.getAsString();}if(code == null)throw new TemplateException("code不能为空！",env);if(roleId == null)throw new TemplateException("roleId不能为空！",env);ModuleRoleService moduleRoleService = SpringContextUtil.getApplicationContextInstance().getBean("moduleRoleService", ModuleRoleService.class);if(moduleRoleService != null){boolean isPrevilege = moduleRoleService.findPrevilegeByCodeAndRoleId(code, new Long(roleId));if(isPrevilege){System.out.println("env.getOut()=="+env.getOut());body.render(env.getOut());}}}}然后最好放到全局变量里去，这样的好处是是在模板里直接使用，要不然每次都需要导入，例如spring里可以这样配置<bean id="freemarkerConfig"class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"><property name="templateLoaderPath"><value>/</value></property><!-- 全局变量部分 --><property name="freemarkerVariables"><entry key="previlegeModuleEnum" value-ref="previlegeModuleEnum" /></map></property></bean><bean id="operatorDirective " class="com.uns.mall.ma.directive.OperatorDirective " />最后在模板里使用<@ operatorDirective roleId="data" code ="data"/>
解决方案二：
解决方案三：
* @param loopVars an array that corresponds to the "loop variables", in * the order as they appear in the directive call. ("Loop variables" are out-parameters * that are available to the nested body of the directive; see in the Manual.) * You set the loop variables by writing this array. The length of the array gives the * number of loop-variables that the caller has specified.如<#list 0..x as i> 大体意思就是loopVars存放的是循环变量 对嵌套body内是有效的 也就是说可以修改这个数组改变循环变量 再比如<#list 0..x as i> <#list 0..x as j> 那么这个数组的长度就是2
解决方案四：
哥们看这个：http://blog.csdn.net/laufu/article/details/6748617