使用idea+springboot+Mybatis搭建web项目

使用idea+springboot+Mybatis搭建web项目

springboot的优势之一就是快速搭建项目，省去了自己导入jar包和配置xml的时间，使用非常方便。

1、创建项目project,然后选择Spring initializr，点击下一步

2、按图示进行勾选，点击下一步，给项目起个名字，点击确定。

3、项目生成有，点击add as maven project,idea 会自动下载jar包，时间比较长

4、项目生成后格式如下图所示：

其中DemoApplication.java是项目主入口，通过run/debug configuration进行配置，就可运行，因为集成了tomcat，所以该项目只需启动一遍即可，不用每次修改代码后重启项目，但是修改代码后需重新编译下，新代码才会生效。

5、生成的项目中，resources文件夹下，static文件夹下存放静态文件，比如css、js、html和图片等
templates下存放html文件，controller默认访问该文件夹下的html文件。
这个在application.properties配置文件中是可以修改的。
6、在application.properties中配置数据库信息

spring<span class="hljs-preprocessor">.datasource<span class="hljs-preprocessor">.url = jdbc:mysql://localhost:<span class="hljs-number">3306/test
spring<span class="hljs-preprocessor">.datasource<span class="hljs-preprocessor">.username = root
spring<span class="hljs-preprocessor">.datasource<span class="hljs-preprocessor">.password =  <span class="hljs-number">1234
spring<span class="hljs-preprocessor">.datasource<span class="hljs-preprocessor">.driverClassName = <span class="hljs-keyword">com<span class="hljs-preprocessor">.mysql<span class="hljs-preprocessor">.jdbc<span class="hljs-preprocessor">.Driver
<span class="hljs-preprocessor">#&#x9875;&#x9762;&#x70ED;&#x52A0;&#x8F7D;
spring<span class="hljs-preprocessor">.thymeleaf<span class="hljs-preprocessor">.cache = false</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

创建一个controller类：helloworld

<span class="hljs-annotation">@Controller
<span class="hljs-annotation">@EnableAutoConfiguration
<span class="hljs-keyword">public <span class="hljs-class"><span class="hljs-keyword">class <span class="hljs-title">HelloWorld {
    <span class="hljs-annotation">@Autowired
    <span class="hljs-keyword">private IRegService regService;
    <span class="hljs-annotation">@RequestMapping(<span class="hljs-string">"/")
    String home() {
        <span class="hljs-keyword">return <span class="hljs-string">"index";
    }
     <span class="hljs-annotation">@RequestMapping(<span class="hljs-string">"/reg")
    <span class="hljs-annotation">@ResponseBody
    Boolean reg(<span class="hljs-annotation">@RequestParam(<span class="hljs-string">"loginPwd") String loginNum, <span class="hljs-annotation">@RequestParam(<span class="hljs-string">"userId") String userId ){
        String pwd = creatMD5(loginNum);
        System.out.println(userId+<span class="hljs-string">":"+loginNum);
        regService.regUser(userId,pwd);
        <span class="hljs-keyword">return <span class="hljs-keyword">true;
    }
    <span class="hljs-keyword">private String <span class="hljs-title">creatMD5(String loginNum){
        </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

user类：

<span class="hljs-keyword">public <span class="hljs-keyword">class User {
    <span class="hljs-keyword">private String id;
    <span class="hljs-keyword">private String userId;
    <span class="hljs-keyword">private String pwd;

    <span class="hljs-keyword">public String <span class="hljs-title">getId() {
        <span class="hljs-keyword">return id;
    }

    <span class="hljs-keyword">public <span class="hljs-keyword">void <span class="hljs-title">setId(String id) {
        <span class="hljs-keyword">this.id = id;
    }

    <span class="hljs-keyword">public String <span class="hljs-title">getUserId() {
        <span class="hljs-keyword">return userId;
    }

    <span class="hljs-keyword">public <span class="hljs-keyword">void <span class="hljs-title">setUserId(String userId) {
        <span class="hljs-keyword">this.userId = userId;
    }

    <span class="hljs-keyword">public String <span class="hljs-title">getPwd() {
        <span class="hljs-keyword">return pwd;
    }

    <span class="hljs-keyword">public <span class="hljs-keyword">void <span class="hljs-title">setPwd(String pwd) {
        <span class="hljs-keyword">this.pwd = pwd;
    }
}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

新建一个mapper接口

<span class="hljs-keyword">public <span class="hljs-class"><span class="hljs-keyword">interface <span class="hljs-title">UserMapper {
    <span class="hljs-annotation">@Select(<span class="hljs-string">"select * from users where userId = #{userId}")
    User findUserByUserid(<span class="hljs-annotation">@Param(<span class="hljs-string">"userId") String userId);
    <span class="hljs-annotation">@Insert(<span class="hljs-string">"insert into users (userId,pwd) values (#{userId},#{pwd})")
    <span class="hljs-keyword">boolean insertUsers (<span class="hljs-annotation">@Param(<span class="hljs-string">"userId") String userId,<span class="hljs-annotation">@Param(<span class="hljs-string">"pwd") String pwd);
}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

service接口及实现：

<span class="hljs-keyword">public <span class="hljs-keyword">interface IRegService {
    boolean regUser(String uerId,String pwd);
}</span></span>

<span class="hljs-annotation">@Service()
<span class="hljs-keyword">public <span class="hljs-class"><span class="hljs-keyword">class <span class="hljs-title">RegService <span class="hljs-keyword">implements <span class="hljs-title">IRegService {
    <span class="hljs-annotation">@Autowired
    <span class="hljs-keyword">private UserMapper userMapper;
    <span class="hljs-annotation">@Override
    <span class="hljs-keyword">public <span class="hljs-keyword">boolean <span class="hljs-title">regUser(String uerId, String pwd) {

        Boolean flag;
        <span class="hljs-keyword">try {
            flag = userMapper.insertUsers(uerId,pwd);
        }<span class="hljs-keyword">catch (Exception e){
            <span class="hljs-keyword">return <span class="hljs-keyword">false;
        }
        <span class="hljs-keyword">return flag;
    }
}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

最后在主类名上添加mapperscan包扫描：

<span class="hljs-annotation">@SpringBootApplication
<span class="hljs-annotation">@MapperScan(<span class="hljs-string">"com.example.mapper")
<span class="hljs-keyword">public <span class="hljs-class"><span class="hljs-keyword">class <span class="hljs-title">DemoApplication {
    <span class="hljs-keyword">public <span class="hljs-keyword">static <span class="hljs-keyword">void <span class="hljs-title">main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}</span></span></span></span></span></span></span></span></span></span></span>

这是项目最后的包结构：

注意点：1、DemoApplication类跟controller包等平行
2、@controller注解返回指定页面，本文中即返回index页面，也就是templates文件夹下的index.html
3、如果需要返回json字符串、xml等，需要在有@controller类下相关的方法上加上注解@responsebody
4、@restcontroller注解的功能等同于@controller和@responsebody
有问题请留言，一起讨论。
5、springboot默认缓存templates下的文件，如果html页面修改后，看不到修改的效果，设置spring.thymeleaf.cache = false即可

转自：http://blog.csdn.net/alantuling_jt/article/details/54893383

Original: https://www.cnblogs.com/zjoch/p/7615154.html
Author: 遥望星空
Title: 使用idea+springboot+Mybatis搭建web项目