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在一个列表中，我想合并一个 if host.machine == 1 then action=Set else action=Create

我想要以下输出 Type:Machine;Action:Set;Attributes[Name:machine1~NodeManager.ListenAddress:10.104.17.70~NodeManager.ListenPort:5558]<BR> Type:Machine;Action:Create;Attributes[Name:machine2~NodeManager.ListenAddress:10.104.17.71~NodeManager.ListenPort:5558]<BR>

我的数据

hosts:[{"name": "trfuoemlpa004v", "node": 0, "server": 1, "Machine": 1, "ManagedPort": "7002", "SSLPort": 1081}, {"name": "trfuoemlpa007v", "node": 1, "server": 2, "Machine": 2, "ManagedPort": "7002", "SSLPort": 1081}]

我制作的不同模板都失败了：

1) <#list hosts as host><#assign machine=${host.machine}><#if machine == 1><#assign action="Set"><#else><#assign action="Create"></#if>Type:Machine;Action:${action};Attributes[Name:${host.machine}~NodeManager.ListenAddress:${host.name}~NodeManager.ListenPort:${nodeManagerPort}]<BR></#list>

**freemarker.core.ParseException: Encountered "}" at line 8, column 40 in J2EE.properties. Was expecting one of:">" ... "." ... "[" ... "(" ... "?" ... "!" ... <TERMINATING_EXCLAM> ... "??" ... "+" ...**

2) <#list hosts as host><#if host.machine == 1><#assign action="Set"><#else><#assign action="Create"></#if>Type:Machine;Action:${action};Attributes[Name:${host.machine}~NodeManager.ListenAddress:${host.name}~NodeManager.ListenPort:${nodeManagerPort}]<BR></#list>

**freemarker.core.InvalidReferenceException: Expression host.machine is undefined**

3) <#list hosts as host><#if $host.machine} == 1 > ...

**freemarker.core.ParseException: Encountered "}" at line 8, column 40 in J2EE.properties. Was expecting one of:">" ... "." ... "[" ... "(" ... "?" ... "!" ... <TERMINATING_EXCLAM> ... "??" ... "+" ...**

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1 回答 1

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第二个是正确的，因为在$FreeMarker 表达式中没有特殊含义（字符串文字除外）。仅用于将表达式的值插入静态文本（或字符串文字）。错误消息意味着该变量没有调用子变量或者它是. 在最后一种情况下，您必须为其指定一些默认值，例如.${expression}hostmachinenullhost.machine!0

顺便说一句，这个：

<#if host.machine == 1><#assign action="Set"><#else><#assign action="Create"></#if>Type:Machine;Action:${action};

可以这样写：

Type:Machine;Action:<#if host.machine == 1>Set<#else>Create</#if>;

于 2012-09-12T12:14:00.323 回答