吴裕雄天生自然SPRINGBOOT开发实战SpringBoot HTML表单登录

<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>com.jjjj</groupId>
    <artifactId>9-7-html</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <!-- 声明项目配置依赖编码格式为 utf-8 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <fastjson.version>1.2.24</fastjson.version>
    </properties>

    <dependencies>

        <!-- DevTools in Spring Boot 项目热部署 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!--引入jquery-webjar -->
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.3.1</version>
        </dependency>

        <!--引入bootstrap -->
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>4.0.0</version>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

    <form th:action="@{/user/login}" method="post">
        <p>
            用户名：<input name="username" type="text" placeholder="userName">
        </p>
        <p>
            密 码：<input name="password" type="password" placeholder="Password">
        </p>
        <button type="submit">提交</button>
    </form>

</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

    <h1>成功</h1>

</body>
</html>

package firstlogindemo.demo.config;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.thymeleaf.util.StringUtils;

import java.util.Map;

@Controller
public class LoginController {
    // @DeleteMapping
    // @PutMapping
    // @GetMapping
    // @RequestMapping(value = "/usr/login", method = RequestMethod.POST)

    @PostMapping(value = "/user/login")
    public String login(@RequestParam("username") String username, @RequestParam("password") String password,
            Map<String, Object> map) {

        if (!StringUtils.isEmpty(username) && "123456".equals(password)) {

            return "success";
        }

        map.put("msg", "用户名密码错误");
        return "index";
    }

}

package firstlogindemo.demo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@SuppressWarnings("deprecation")
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

    @Bean
    public WebMvcConfigurerAdapter webMvcConfigurerAdapter() {

        WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {

                registry.addViewController("/").setViewName("index");
                registry.addViewController("index.html").setViewName("index");
            }
        };
        return adapter;
    }
}

package firstlogindemo.demo.config;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootRestExampleApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootRestExampleApplication.class, args);
    }
}

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原文地址：https://www.cnblogs.com/tszr/p/15239511.html