spring boot 登录注册 demo （一）

Welcome to Spring Boot

代码结构

src/main/java 下

controller层，路由功能
dao层，数据库的访问
domain，bean的存放
service，业务层
application.java，spring boot的主启动程序

src/main/resources/application.properties ，spring boot的配置文件

详细代码说明

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>com.jwen</groupId>
     <artifactId>login</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>

     <name>login</name>
     <description>Demo project for Spring Boot</description>

     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.4.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
     </properties>

     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter</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-thymeleaf</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-devtools</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
                 <dependencies>
                     <dependency>
                         <groupId>org.springframework</groupId>
                         <artifactId>springloaded</artifactId>
                     </dependency>
                 </dependencies>
             </plugin>
         </plugins>
     </build>

 </project>

简易说明：

thymeleaf -- 用来渲染模板，spring boot 不建议使用JSP

devtools -- 用来热部署，可以只关注coding，保存后自行restart

jpa -- 数据库访问，很好很强大

LoginApplication.java

package com.jwen.login;

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

@SpringBootApplication
public class LoginApplication {

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

UserController.java

package com.jwen.login.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.jwen.login.domain.User;
import com.jwen.login.service.UserService;

@Controller
@EnableAutoConfiguration
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/")
    @ResponseBody
    String welcome() {
        return "welcome my first spring boot project";
    }

    @RequestMapping("/notVerify")
    @ResponseBody
    String notVerify() {
        return "username or password NOT correct";
    }

    @RequestMapping("/login")
    String login(Model model) {
        model.addAttribute("user", new User());
        return "login";
    }

    @RequestMapping("/register")
    String register(Model model) {
        model.addAttribute("user", new User());
        return "register";
    }

    @RequestMapping(value = "/registerUser", method = RequestMethod.POST)
    @ResponseBody
    String registerUser(User user, Model model) {
        return userService.registerUser(user);
    }

    @RequestMapping(value = "/userLogin", method = RequestMethod.POST)
    String userLogin(User user, Model model) {
        boolean verify = userService.verifyUser(user);
        if (verify) {
            model.addAttribute("name", user.getName());
            model.addAttribute("password", user.getPassword());
            return "result";
        } else {
            return "redirect:/notVerify";
        }

    }

}

@RequestMapping("/login")  ensures that HTTP requests to /login are mapped to the login() method，这个注解可以使指定的uri指向到该方法

@ResponseBody 返回response，一般return为string的话，页面就直接返回该string

配置application.properties，指向html文件：

spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.cache=false
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html

会去识别resources/templates下的html文件，根据return回来的string来匹配

@RequestMapping("/login")
String login(Model model) {
    model.addAttribute("user", new User());
    return "login";
    }

这里没有@ResponseBody ，因此会去匹配到login.html