构建和运行 Velocity 生成 HTML [英] Building and Running Velocity Generating HTML
问题描述
我对使用 Velocity 很陌生.我正在尝试使用它来生成 HTML 表单.我在 Eclipse 工作.以下 jars 在我的类路径中:
I'm very new to using Velocity. I am trying to use it to generate an HTML form. I am working in Eclipse. The following jars are in my classpath:
velocity-dep-1.5.jar
commons-collections.jar
commons-lang.jar
log4j-1.2.8.jar
ant.jar
我正在运行一个 ant 构建文件来构建我的项目，但我没有看到正在生成的 HTML.为了让它实际生成HTML文件，我缺少什么吗?我遵循的教程只有两个文件，我基于我的.它对作者有用，但也许还有一些我没有意识到使用速度的新手.我已经包含了我的代码和构建脚本，以便更容易地查看我是否遗漏了什么.非常感谢！
I am running an ant build file to build my project, but I don't see the HTML being generated. Is there something I'm missing in order to get it to actually generate the HTML file? The tutorial I was following only has two files that I based mine off of. It worked for the author, but perhaps there is something else that I don't realize being new to using velocity. I have included my code and build script to make it easier to see if I'm missing something. Thank you very much!
我的表单模板代码在这里 (form.vm):
I have the template code for my form here (form.vm):
<html>
<head>
<title> My Form </title>
</head>
<body>
#if ($fieldErrors)
#foreach ($error in $fieldErrors)
$error<br>
#end
#end
#if ($actionErrors)
#foreach ($error in $actionErrors)
$error<br>
#end
#end
<form name="edit" action="edit.action" method="post">
<table>
<tr><td>Testing</td><td>123</td></tr>
#foreach($map in $radioList)
#formRowRadio("method" $method "true" $selected)<br/>
#end
</table>
<table>
#foreach($map in $textList)
#formRowText($label $label $value)
#end
<tr><td> </td><td><input type="submit" name="submit" value="submit"></td></tr>
</table>
</form>
</body>
</html>
这是我必须使用的 Java 代码 (formDemo.java)
Here is the java code I have to go along with that (formDemo.java)
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.Template;
public class formDemo {
public static void main ( String[] args )
throws Exception {
Velocity.init();
ArrayList radioList = new ArrayList();
Map map = new HashMap();
map.put("method", "Yes");
map.put("selected", false);
radioList.add(map);
map = new HashMap();
map.put("method", "No");
map.put("selected", false);
radioList.add(map);
/*
* add the list to a VelocityContext
*/
VelocityContext context = new VelocityContext();
context.put("radios", radioList);
ArrayList textList = new ArrayList();
map = new HashMap();
map.put("label", "FirstName");
map.put("value", "");
textList.add(map);
map = new HashMap();
map.put("label", "LastName");
map.put("value", "");
textList.add(map);
context.put("textfields", textList);
Template template = Velocity.getTemplate("form.vm");
StringWriter writer = new StringWriter();
template.merge(context, writer);
}
}
构建脚本(build.xml)
<?xml version='1.0' encoding='UTF-8'?>
<project name="velocityTemplate" default="jar" basedir=".">
<property name='cls' location='${basedir}/classes'/>
<property name='dat' location='${basedir}/data'/>
<property name='gen' location='${basedir}/gen'/>
<property name='lib' location='${basedir}/lib'/>
<property name='src' location='${basedir}/src'/>
<property name='tmp' location='${basedir}/templates'/>
<path id='project.classpath'>
<pathelement location='${cls}'/>
<fileset dir='${lib}' includes='*.jar'/>
</path> <target name='clean' description='Clean.'>
<delete dir='${cls}'/>
<delete dir='${gen}'/>
</target>
<target name='comp' description='Compile the source.'>
<mkdir dir='${cls}'/>
<javac srcdir='${src}' destdir='${cls}' classpathref='project.classpath' fork='true'/>
</target>
<target name='jar' depends='comp' description='JAR the application.'>
<jar destfile='${ant.project.name}.jar' update='false' filesonly='true' index='true'>
<fileset dir='${cls}'/>
<fileset dir='${src}'/>
</jar>
</target>
<target name='run' depends='jar' description='Run the application.'>
<path id='velocityTemplate.classpath'>
<pathelement location='${ant.project.name}.jar'/>
<fileset dir='${lib}' includes='*.jar'/>
</path>
<taskdef classpathref='velocityTemplate.classpath'/>
<mkdir dir='${gen}'/>
<enumerator outputPath='${gen}' inputPath='${dat}' templateFile='${tmp}/form.vm'/>
</target>
<target name='form' description='Creates form'>
<path id='velocityTemplate.classpath'>
<pathelement location='${basedir}/velocityTemplate.jar'/>
<pathelement location='${lib}/velocity-dep-1.5.jar'/>
</path>
<taskdef classpathref='velocityTemplate.classpath'/>
<velocityTemplate outputPath='${basedir}/src' templateFile='${basedir}/form.vm'/>
</target>
</project>
推荐答案
如果您只想查看生成的 html，则必须打印出 StringWriter 的值或将其写入文件.
If you just want to see the html being generated, you'll have to print out the value of the StringWriter or write it to a file.
目前，除非缺少代码，否则您只是在填充缓冲区.
Currently, unless there's code missing, you're just filling up the buffer.
Template template = Velocity.getTemplate("form.vm");
StringWriter writer = new StringWriter();
template.merge(context, writer);
template.merge(context, writer) 只是将模板呈现给 StringWriter 对象.
template.merge(context, writer) just renders the template to the StringWriter object.
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