javaweb项目，直接使用thymeleaf模板引擎

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javaweb直接使用thymeleaf

1 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.webrx</groupId>
    <artifactId>th01</artifactId>
    <version>1.0</version>
    <packaging>war</packaging>


    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf -->
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf</artifactId>
            <version>3.0.12.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

</project>

2 thymeleaf监听器

/*
 * Copyright (c) 2006, 2021, webrx.cn All rights reserved.
 *
 */
package cn.webrx.listener;

import org.thymeleaf.TemplateEngine;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

/**
 * <p>Project: th01 - ThymeleafListener
 * <p>Powered by webrx On 2021-09-28 13:55:03
 * <p>Created by IntelliJ IDEA
 *
 * @author webrx [webrx@126.com]
 * @version 1.0
 * @since 17
 */
@WebListener
public class ThymeleafListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext sctx = sce.getServletContext();
        ServletContextTemplateResolver resolver = new ServletContextTemplateResolver(sctx);
        resolver.setPrefix("/WEB-INF/templates/");
        resolver.setCharacterEncoding("utf-8");
        resolver.setTemplateMode(TemplateMode.HTML);

        TemplateEngine engine = new TemplateEngine();
        engine.setTemplateResolver(resolver);

        sctx.setAttribute("engine",engine);
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        ServletContextListener.super.contextDestroyed(sce);
    }
}

3 servlet模板引擎显示

/*
 * Copyright (c) 2006, 2021, webrx.cn All rights reserved.
 *
 */
package cn.webrx.servlet;

import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.WebContext;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.WebConnection;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * <p>Project: th01 - Index
 * <p>Powered by webrx On 2021-09-28 13:50:59
 * <p>Created by IntelliJ IDEA
 *
 * @author webrx [webrx@126.com]
 * @version 1.0
 * @since 17
 */
@WebServlet("/")
public class Index extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ServletContext sctx = req.getServletContext();
        TemplateEngine engine = (TemplateEngine)sctx.getAttribute("engine");
        resp.setCharacterEncoding("utf-8");
        req.setAttribute("name","张三丰");
        req.setAttribute("info","<span style=\"color:red;\">hello</span>");
        WebContext context = new WebContext(req,resp,sctx);
        engine.process("index.html",context,resp.getWriter());
    }

    protected void hello(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");
        PrintWriter out = resp.getWriter();
        out.println("<!DOCTYPE html>");
        out.println("<html>");
        out.println("<head>");
        out.println("<meta charset=\"utf-8\">");
        out.println("<title>玉灵 QQ:7031633 Email:webrx@126.com</title>");
        out.println("<meta name=\"keywords\" content=\"关键字\">");
        out.println("<meta name=\"description\" content=\"简介\">");
        out.println("</head>");
        out.println("<body>");

        out.println("<h3>Hello World  中文效果</h3>");

        out.println("</body>");
        out.println("</html>");
        out.flush();
        out.close();
    }
}

4 html 模板文件位置及内容

<!DOCTYPE html>
<html lang="zh-CN" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>玉灵 QQ:7031633 Email:webrx@126.com</title>
</head>
<body>
[[${3*3 == 9 ? 'yes9' : 'nonono...'}]]
<br>
[[${2*3}]]
<br>
[[${info}]]  ---- [(${info})]
<p th:text="${info}"></p>
<p th:utext="${info}"></p>
<hr>
<p th:text="${name}"></p>
</body>
</html>