自己写的一个工具类: VelocityUtils
velocity1.7小例子 http://www.cnblogs.com/jston/archive/2013/02/19/2916999.html
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Xml代码 <dependency> <groupId>velocity</groupId> <artifactId>velocity</artifactId> <version>1.4</version> </dependency> |
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Java代码 package com.util; import org.apache.velocity.Template; import org.apache.velocity.VelocityContext; import org.apache.velocity.app.Velocity; import org.apache.velocity.app.VelocityEngine; import java.io.InputStream; import java.io.Reader; import java.io.StringWriter; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Properties; /** * 模板处理工具类，现在只支持类路径方式，不支持jar,绝对路径等方式。 * * @author pandy * */ @SuppressWarnings("rawtypes") public class VelocityUtils { private final static String DEFAULT_TEMPLATE_PATH = ""; private final static String DEFAULT_LOG_TAG = "mystring"; private static VelocityEngine engine; /** * 做初始化信息 */ static { Properties p = new Properties(); // 设置输入输出编码类型。和这次说的解决的问题无关 p.setProperty(Velocity.INPUT_ENCODING, "UTF-8"); p.setProperty(Velocity.OUTPUT_ENCODING, "UTF-8"); p.setProperty("userdirective", "org.apache.velocity.tools.generic.directive.Ifnull"); // 这里加载类路径里的模板而不是文件系统路径里的模板 p.setProperty("resource.loader", "class"); p.setProperty("class.resource.loader.class","org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader"); engine = new VelocityEngine(); try { engine.init(p); Velocity.init(); } catch (Exception e) { e.printStackTrace(); engine = null; } } /** * 参数转换：Pap->VelocityContext * * @param paramters * @return */ private static VelocityContext parseMapToVelocityContext(Map paramters) { VelocityContext context = new VelocityContext(); if (paramters != null && !paramters.isEmpty()) { Iterator it = paramters.keySet().iterator(); while (it.hasNext()) { Object key = it.next(); Object value = paramters.get(key); context.put(key.toString(), value); } } return context; } /** * 读取模板文件 * * @param templateName * @param path * @return */ private static Template getTemplate(String templateName, String path) { Template template = null; try { template = engine.getTemplate(path + templateName); } catch (Exception e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } return template; } /** * * @param templateName * @return 模板的html字符串 */ public static String merge(String templateName) { return merge(templateName, null, null, null); } /** * * @param templateName * @param path * @return */ public static String merge(String templateName, String path) { return merge(templateName, path, null, null); } /** * 这个方法要自动转换Map类型，变成VelocityContext类型 * * @param templateName * @param paramters * @return 模板的html字符串 */ public static String merge(String templateName, Map paramters) { return merge(templateName, DEFAULT_TEMPLATE_PATH, parseMapToVelocityContext(paramters), null); } /** * * @param templateName * @param path * @param paramters * @return */ public static String merge(String templateName, String path, Map paramters) { return merge(templateName, path, parseMapToVelocityContext(paramters), null); } /** * * @param templateName * @param context * @return 模板的html字符串 */ public static String merge(String templateName, String path, VelocityContext context) { return merge(templateName, path, context, null); } /** * * @param templateName * @param context * @return */ public static String merge(String templateName, VelocityContext context) { return merge(templateName, DEFAULT_TEMPLATE_PATH, context, null); } /** * * @param templateName * @param context * @param writer * @return 模板的html字符串 */ public static String merge(String templateName, VelocityContext context, StringWriter writer) { return merge(templateName, DEFAULT_TEMPLATE_PATH, context, writer); } /** * 最终执行方法 * * @param templateName * @param path * @param context * @param writer * @return 模板的html字符串 */ public static String merge(String templateName, String path, VelocityContext context, StringWriter writer) { Template template = getTemplate(templateName, path); if (writer == null) { writer = new StringWriter(); } try { template.merge(context, writer); } catch (Exception e) { e.printStackTrace(); return null; } /* show the World */ return writer.toString(); } public static String mergeWithStr(Map paramters, String templateStr) { StringWriter writer = new StringWriter(); return mergeWithStr(parseMapToVelocityContext(paramters), writer, templateStr); } public static String mergeWithStr(Map paramters, StringWriter writer, String templateStr) { return mergeWithStr(parseMapToVelocityContext(paramters), writer, templateStr); } public static String mergeWithStr(VelocityContext context, StringWriter writer, String templateStr) { try { Velocity.evaluate(context, writer, DEFAULT_LOG_TAG, templateStr); } catch (Exception e) { e.printStackTrace(); } return writer.toString(); } public static String mergeWithStr(Map paramters, Reader reader) { StringWriter writer = new StringWriter(); return mergeWithStr(parseMapToVelocityContext(paramters), writer, reader); } public static String mergeWithStr(Map paramters, StringWriter writer, Reader reader) { return mergeWithStr(parseMapToVelocityContext(paramters), writer, reader); } public static String mergeWithStr(VelocityContext context, StringWriter writer, Reader reader) { try { Velocity.evaluate(context, writer, DEFAULT_LOG_TAG, reader); } catch (Exception e) { e.printStackTrace(); } return writer.toString(); } @Deprecated public static String mergeWithStr(Map paramters, InputStream instream) { StringWriter writer = new StringWriter(); return mergeWithStr(parseMapToVelocityContext(paramters), writer, instream); } @Deprecated public static String mergeWithStr(Map paramters, StringWriter writer, InputStream instream) { return mergeWithStr(parseMapToVelocityContext(paramters), writer, instream); } @Deprecated public static String mergeWithStr(VelocityContext context, StringWriter writer, InputStream instream) { try { Velocity.evaluate(context, writer, DEFAULT_LOG_TAG, instream); } catch (Exception e) { e.printStackTrace(); } return writer.toString(); } @SuppressWarnings("unchecked") public static void main(String[] args) { Map paramters = new HashMap(); paramters.put("name", "Pandy"); paramters.put("site", "http://zhuhaironghui.oicp.net"); String str = merge("hello.vm", "com/rh/core/menu/templates/", paramters); System.out.println(str); System.out.println(mergeWithStr(paramters, "Hello $name! Welcome to $site world!")); } } |
模板:com/templates/hello.vm
Hello $name! Welcome to $site world!
调用
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Java代码 import com.util.VelocityUtils; import java.util.HashMap; import java.util.Map; /** * Created by pandy on 14-8-13. */ public class ToolMain { public static void main(String[] args){ Map<String, Object> context = new HashMap<String, Object>(); context.put("name","Pandy"); context.put("site","www.pandy8.com"); String gridConfigStr = VelocityUtils.merge("com/templates/hello.vm", context); System.out.println(gridConfigStr); } } |
输出:
Hello Pandy! Welcome to www.pandy8.com world!
