使用velocity

ゞ浴缸里的玫瑰 2022-06-02 09:28 177阅读 0赞

使用maven引入jar

<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>
        <exclusions>
            <exclusion>
                <groupId>org.apache.struts</groupId>
                <artifactId>struts-tiles</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.apache.struts</groupId>
                <artifactId>struts-taglib</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.apache.struts</groupId>
                <artifactId>struts-core</artifactId>
            </exclusion>
            <exclusion>
                <groupId>sslext</groupId>
                <artifactId>sslext</artifactId>
            </exclusion>
            <exclusion>
                <groupId>oro</groupId>
                <artifactId>oro</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    
      <dependency>
                <groupId>commons-configuration</groupId>
                <artifactId>commons-configuration</artifactId>
                <version>1.10</version>
            </dependency>
            <dependency>
                <groupId>commons-net</groupId>
                <artifactId>commons-net</artifactId>
                <version>3.3</version>
            </dependency>

创建TemplateUtil工具类

package com.os.core.util.web;
    
    import org.apache.velocity.Template;
    import org.apache.velocity.VelocityContext;
    import org.apache.velocity.app.VelocityEngine;
    
    import java.io.*;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Properties;
    
    
    public class TemplateUtil {
        public static void main(String[] args) {
            test();
        }
    
        /**
         * 测试方法
         */
        public static void test() {
            try {
                String vmContent = "${dataMap.value1}中文<br/>${dataMap.value2}";
                String vmFileUrl = "";//CommonConstants.templateFileDir;
                //生成模板文件
                String fileName = createTemplateFile(vmContent, vmFileUrl);
                //模板上下文
                Map<String, Object> dataMap = new HashMap<String, Object>();
                dataMap.put("value1", "ssssssssssssssssssssss");
                dataMap.put("value2", "中文");
                VelocityContext context = new VelocityContext();
                context.put("dataMap", dataMap);
    
                //获取模板生成器
                VelocityEngine engine = initEngine("");//CommonConstants.templateFileDir
                //html文件生成全路径
                File file = new File("", "UTF-8");//CommonConstants.htmlFileDir+"/index.html"
                boolean createSuccess = createHtmlFile(engine, fileName, file, context);
                if (createSuccess) {
                    System.out.println("文件生成完成");
                } else {
                    System.out.println("文件生成失败");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 生成静态的HTML文件
         *
         * @param engine       模板生成器
         * @param tempFileName 模板文件
         * @param file         HTML生成的全路径
         * @param context      模板上下文
         * @return true生成成功 false生成失败
         * @throws Exception
         */
        public static boolean createHtmlFile(VelocityEngine engine, String tempFileName, File file, VelocityContext context) {
            try {
                if (file.getParentFile().exists() == false) {
                    file.getParentFile().mkdirs();
                }
                Template temp = engine.getTemplate(tempFileName, "UTF-8");
                FileOutputStream tempFos = new FileOutputStream(file);
                BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(tempFos, "UTF-8"));
                temp.setEncoding("UTF-8");
                temp.merge(context, writer);
                writer.close();
                tempFos.close();
                return true;
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
    
        }
    
        /**
         * 初始化模板生成器
         *
         * @return VelocityEngine
         * @throws Exception
         */
        public static VelocityEngine initEngine(String genDir) throws Exception {
            VelocityEngine engine = new VelocityEngine();
            Properties properties = new Properties();
            properties.setProperty(VelocityEngine.FILE_RESOURCE_LOADER_PATH, genDir);
            properties.setProperty(VelocityEngine.INPUT_ENCODING, "UTF-8");
            properties.setProperty(VelocityEngine.OUTPUT_ENCODING, "UTF-8");
            engine.init(properties);
            return engine;
        }
    
        /***
         * 创建模板文件
         *
         * @param fileContext  模板内容
         * @param createDirUrl 模板保存目录
         */
        public static String createTemplateFile(String fileContext, String createDirUrl) {
            BufferedWriter bw = null;
            try {
                String fileDirUrl = createDirUrl + ".vm";
                File file = new File(fileDirUrl);
                if (file.getParentFile().exists() == false) {
                    file.getParentFile().mkdirs();
                }
                bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), "UTF-8"));
                bw.write(fileContext);
                return fileDirUrl;
            } catch (Exception e) {
                System.out.println("生成模板文件出错");
                e.printStackTrace();
                return null;
            } finally {
                if (bw != null) {
                    try {
                        bw.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
    
        }
    }