java velocity模板用法（替换、循环、if判断）

朱雀 2020-09-26 11:06 3872阅读 1赞

一、.vm模板文件，例如一个名为test.vm的模板文件

${name}
    #foreach($nameObj in $inputNewNames)
        alert($nameObj);
    #end
    var obj = {//对象加逗号，用$velocityCount判断是否是最后一个
    #foreach($nameObj in $inputNewNames)
        "$nameObj":$nameObj#if($velocityCount!=$inputMainNames.size()),#end
    #end
    }
    #if($name=="111")
        alert("111");
    #elseif($name=="222")
        alert("222");
    #else
        alert("333");
    #end

注：$\{name\}和$name效果一样，循环里可以用$velocityCount判断，$velocityCount值默认为1

二、java文件

VelocityContext context = new VelocityContext();
    context.put("name", "111");//替换文本
    List<String> list = new ArrayList<>();
    list.add("a");
    list.add("b");
    context.put("arr", list);//循环
    VelocityEngine ve = new VelocityEngine();
    Properties properties = new Properties();
    String templatePath = FileGenerate.class.getResource("/template").getPath();//模板所在路径
    properties.setProperty(ve.FILE_RESOURCE_LOADER_PATH, templatePath); //此处的fileDir可以直接用绝对路径来
    ve.init(properties); //初始化
    Template tpl = ve.getTemplate("test.vm", "UTF-8");
    String outPath = "C:\\Users\\dell\\Desktop\\aa";//输出路径
    try {
        StringWriter sw = new StringWriter();
        tpl.merge(context, sw);
        File file = new File(outPath);
        file.mkdirs();
        BufferedWriter fw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outPath + ".js"), "UTF-8"));//解决乱码
        PrintWriter pw = new PrintWriter(fw);
        pw.println(sw.toString());
        pw.flush();
        pw.close();
    }catch (IOException e) {
        e.printStackTrace();
    }

三、需要用到的包

<dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity</artifactId>
        <version>1.7</version>
    </dependency>
    <dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity-tools</artifactId>
        <version>2.0</version>
    </dependency>