5 Servlet学习—— thymeleaf

thymeleaf可以让html页面显示从数据库查询出来的数据
一. 添加thymeleaf相关的jar包
二. 创建ViewBaseServlet类 package ServletStudy;import org.thymeleaf.TemplateEngine;import org.thymeleaf.context.WebContext;import org.thymeleaf.templatemode.TemplateMode;import org.thymeleaf.templateresolver.ServletContextTemplateResolver;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;public class ViewBaseServlet extends HttpServlet {private TemplateEngine templateEngine;@Overridepublic void init() throws ServletException {// 1.获取ServletContext对象ServletContext servletContext = this.getServletContext();// 2.创建Thymeleaf解析器对象ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver(servletContext);// 3.给解析器对象设置参数// ①HTML是默认模式，明确设置是为了代码更容易理解templateResolver.setTemplateMode(TemplateMode.HTML);// ②设置前缀String viewPrefix = servletContext.getInitParameter("view-prefix");templateResolver.setPrefix(viewPrefix);// ③设置后缀String viewSuffix = servletContext.getInitParameter("view-suffix");templateResolver.setSuffix(viewSuffix);// ④设置缓存过期时间（毫秒）templateResolver.setCacheTTLMs(60000L);// ⑤设置是否缓存templateResolver.setCacheable(true);// ⑥设置服务器端编码方式templateResolver.setCharacterEncoding("utf-8");// 4.创建模板引擎对象templateEngine = new TemplateEngine();// 5.给模板引擎对象设置模板解析器templateEngine.setTemplateResolver(templateResolver);}//之后所需要用的方法protected void processTemplate(String templateName, HttpServletRequest req, HttpServletResponse resp) throws IOException {// 1.设置响应体内容类型和字符集resp.setContentType("text/html;charset=UTF-8");// 2.创建WebContext对象WebContext webContext = new WebContext(req, resp, getServletContext());// 3.处理模板数据templateEngine.process(templateName, webContext, resp.getWriter());}} 三. 在web.xml中配置 view-prefix/view-suffix.html 四. 创建一个类来继承ViewBaseServlet类 package ServletStudy;import dao.UserDao;import dao.impl.UserDaoImpl;import pojo.User;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.IOException;import java.util.List;@WebServlet("/index.html")public class IndexServlet extends ViewBaseServlet{@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {UserDao userDao = new UserDaoImpl();List userList = userDao.queryUserList();//获取数据库中所有用户信息//保存到session作用域HttpSession session = req.getSession();session.setAttribute("userList",userList);//此处的视图名称是index//thymeleaf会将这个逻辑视图名称对应到物理视图名称上//逻辑视图名称：index//物理视图名称：view-prefix + 逻辑视图名称 + view-suffix//则真实的视图名称是： / index .html（在web.xml里配置的）super.processTemplate("index",req,resp);//将thymeleaf渲染到/index.html}} 五. 在index.html内添加thymeleaf语句 Title姓名密码性别国家数据库为空 【5 Servlet学习—— thymeleaf】在html里使用thymeleaf语句出现报错红线问题： https://blog.csdn.net/H_233/article/details/88081353
最终可以将数据库中每个user的内容渲染到html页面对应位置。