Velocity魔法堂系列一：入门示例

<form action="./submit">
<div>
  <label for="title">标题：</label>
  <input type="text" id="title" name="title"/>
</div>
<div>
  <label for="brief">摘要：</label>
  <input type="text" id="brief" name="brief"/>
</div>
<div>
  <label for="sex">性别：</label>
  <select id="sex" name="sex">
    <option value="0">男</option>
    <option value="1">女</option>
  </select>
</div>
<div>
  <label for="job">职业：</label>
  <select id="job" name="job">
    <option value="0">Java工程师</option>
    <option value="1">Net工程师</option>
  </select>
</div>
</form>

##表单模板
##@author fsjohnhuang
##@version 1.0
## 引入外部模板文件
#parse('macro.vm')
## 主逻辑
<form action="$action">
#foreach($input in $inputs)
#input($input.title $input.id)
#end
#foreach($select in $selects)
#select($select.title $select.id $select.items)
#end
</form>

## 生成input表单元素区域的宏
#macro(input $title $id)
<div>
  <label for="$id">$title</label>
  <input type="text" id="$id" name="$id"/>
</div>
#end
## 生成select表单元素区域的宏
#macro(select $title $id $items)
<div>
  <label for="$id">$title</label>
  <select id="$id" name="$id">
## VTL指令紧贴左侧才能确保结果的排版正常（不会有多余空格）
#foreach($key in $items.keySet())
    <option value="$key">$items.get($key)</option>
#end
  </select>
</div>
#end

public static void main(String[] args) {
        // 初始化模板引擎
        Properties props = new Properties();
        props.put("file.resource.loader.path", ".\\vm");
        VelocityEngine ve = new VelocityEngine(props);
        // 配置引擎上下文对象
        VelocityContext ctx = new VelocityContext();
        ctx.put("action", "./submit");
        ArrayList<HashMap<String, String>> inputs = new ArrayList<HashMap<String,String>>();
        HashMap<String, String> input1 = new HashMap<String, String>();
        input1.put("id", "title");
        input1.put("title", "标题：");
        inputs.add(input1);
        HashMap<String, String> input2 = new HashMap<String, String>();
        input2.put("id", "brief");
        input2.put("title", "摘要：");
        inputs.add(input2);
        ctx.put("inputs", inputs);
        ArrayList<HashMap<String, Object>> selects = new ArrayList<HashMap<String,Object>>();
        HashMap<String, Object> select1 = new HashMap<String, Object>();
        selects.add(select1);
        select1.put("id", "sex");
        select1.put("title", "性别：");
        HashMap<Integer, String> kv1 = new HashMap<Integer, String>();
        kv1.put(0, "男");
        kv1.put(1, "女");
        select1.put("items", kv1);
        HashMap<String, Object> select2 = new HashMap<String, Object>();
        selects.add(select2);
        select2.put("id", "job");
        select2.put("title", "职业：");
        HashMap<Integer, String> kv2 = new HashMap<Integer, String>();
        kv2.put(0, "Java工程师");
        kv2.put(1, "Net工程师");
        select2.put("items", kv2);
        ctx.put("selects", selects);
        // 加载模板文件
        Template t = ve.getTemplate("test.vm");
        StringWriter sw = new StringWriter();
        // 渲染模板
        t.merge(ctx, sw);
        System.out.print(sw.toString());
    }

<form action="./submit">
  <div>
    .................
  </div>
  <div>
    .................
  </div>
  <div>
    .................
  </div>
  <div>
    .................
  </div>
</form>