Thymeleaf+servlet+html前后端参数传递-模拟简单登录实现

使用thymeleaf需引入thymeleaf-2.1.4.RELEASE.jar
manven需添加依赖、还需引入servlet相关jar，可根据自己所需进行添加

<!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf -->
<dependency>
    <groupId>org.thymeleaf</groupId>
    <artifactId>thymeleaf</artifactId>
    <version>2.1.4.RELEASE</version>
</dependency>

Thymeleaf配置工具类
TemplateEngineUtil.java

import javax.servlet.ServletContext;
import javax.servlet.annotation.WebListener;
import org.thymeleaf.TemplateEngine;

@WebListener
public class TemplateEngineUtil {

    private static final String TEMPLATE_ENGINE_ATTR = "com.e-learn.thymeleaf3.TemplateEngineInstance";

    public static void storeTemplateEngine(ServletContext context, TemplateEngine engine) {
        context.setAttribute(TEMPLATE_ENGINE_ATTR, engine);
    }

    public static TemplateEngine getTemplateEngine(ServletContext context) {
        return (TemplateEngine) context.getAttribute(TEMPLATE_ENGINE_ATTR);
    }
}

ThymeleafConfig.java配置映射路径

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ITemplateResolver;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;

@WebListener
public class ThymeleafConfig implements ServletContextListener {

    public void contextInitialized(ServletContextEvent sce) {
        TemplateEngine engine = templateEngine(sce.getServletContext());
        TemplateEngineUtil.storeTemplateEngine(sce.getServletContext(), engine);
    }

    public void contextDestroyed(ServletContextEvent sce) {
    }

    private TemplateEngine templateEngine(ServletContext servletContext) {
        TemplateEngine engine = new TemplateEngine();

        engine.setTemplateResolver(templateResolver(servletContext));
        return engine;
    }

    private ITemplateResolver templateResolver(ServletContext servletContext) {
        ServletContextTemplateResolver resolver = new ServletContextTemplateResolver(servletContext);
        resolver.setPrefix("/WEB-INF/");//需映射html路径
        resolver.setCharacterEncoding("UTF-8");
        resolver.setTemplateMode(TemplateMode.HTML);
        return resolver;
    }
}

servlet代码示例

IndexServlet.java

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

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 java.io.IOException;

@WebServlet(name = "IndexServlet", urlPatterns = "")
public class IndexServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        TemplateEngine engine = TemplateEngineUtil.getTemplateEngine(request.getServletContext());
        WebContext context = new WebContext(request, response, request.getServletContext());
        response.setCharacterEncoding("utf-8");
        engine.process("index.html", context, response.getWriter());
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }
}

index.html代码示例
前端html需引入 xmlns:th=" http://www.thymeleaf.org

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     <title>test</title>
</head>
<body>
<!--头部-->
<a th:href="@{/logre(s=1)}" >登录</a><br/>
<a th:href="@{/logre(s=2)}" >注册</a><br/>
</body>
</html>

logreServlet.java

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

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 java.io.IOException;

@WebServlet(name = "logreServlet", urlPatterns = "/logre")
public class logreServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        TemplateEngine engine = TemplateEngineUtil.getTemplateEngine(request.getServletContext());
        WebContext context = new WebContext(request, response, request.getServletContext());
        response.setCharacterEncoding("utf-8");
        String s = request.getParameter("s");
        if(s==null){
        engine.process("index.html", context, response.getWriter());
        }else if ("1".equals(s)) {
            engine.process("login.html", context, response.getWriter());
        } else if ("2".equals(s)) {
            engine.process("register.html", context, response.getWriter());
        }else{
        	engine.process("index.html", context, response.getWriter());
        }
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }
}

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
<head>

    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     <title>登录</title>
</head>
<body>
<form th:action="@{/login}" method="post">
    用户名：<input type="text" name="username"/>
    密码：<input type="password" name="password"/>
    <input type="submit" value="登录"/>
</form>
</body>
</html>

loginServlet.java示例

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

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 java.io.IOException;

@WebServlet(name = "loginServlet", urlPatterns = "/login")
public class loginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        TemplateEngine engine = TemplateEngineUtil.getTemplateEngine(request.getServletContext());
        WebContext context = new WebContext(request, response, request.getServletContext());
        response.setCharacterEncoding("utf-8");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        request.setAttribute("username", username);
       engine.process("loginsuccess.html", context, response.getWriter());
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }
}

loginsuccess.html示例
使用th:text="${username}" 获取loginServlet传递的username的值

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
<head>

    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     <title>登录成功</title>
</head>
<body>
登录成功！欢迎<span th:text="${username}"></span>
</body>
</html>

原文链接：https://blog.csdn.net/qq_40302523/article/details/83752107