spring-boot - demo - 码农教程

当我发现把最初的一个demo整的面目全非的时候，突然想要找一个简单的demo做测试，发现与其在原来的上面该，还不如新建一个demo。

官方入门：http://projects.spring.io/spring-boot/

最熟悉maven，这次先做一个maven的demo。

创建maven project。

pom：

<?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.test</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <repositories>
        <!--<repository>-->
            <!--<id>spring-snapshots</id>-->
            <!--<url>http://maven.oschina.net/content/groups/public/</url>-->
            <!--<snapshots>-->
                <!--<enabled>true</enabled>-->
            <!--</snapshots>-->
        <!--</repository>-->
        <repository>
            <id>springsource-repos</id>
            <name>SpringSource Repository</name>
            <url>http://repo.spring.io/release/</url>
        </repository>
        <repository>
            <id>central-repos</id>
            <name>Central Repository</name>
            <url>http://repo.maven.apache.org/maven2</url>
        </repository>
        <repository>
            <id>central-repos2</id>
            <name>Central Repository 2</name>
            <url>http://repo1.maven.org/maven2/</url>
        </repository>
    </repositories>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <!-- Import dependency management from Spring Boot -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.4.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
                <dependencies>
                    <!-- spring热部署-->
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>springloaded</artifactId>
                        <version>1.2.6.RELEASE</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

这里添加了web基础依赖，模板为thymeleaf, 添加一个简单的security配置。

创建src/resources/application.yml:

spring:
  profiles:
    active: dev

创建src/resources/application-dev.yml:

#用户名 密码配置
security:
  user:
    name: admin
    password: test

创建启动入口hello.SampleController：

package hello;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@SpringBootApplication
public class SampleController {

    @RequestMapping("/")
    public String home() {
        return "redirect:/hello/index";
    }

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

创建一个Controller: hello.HelloController

package hello;

import hello.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by miaorf on 2016/8/2.
 */
@RequestMapping("/hello")
@Controller
public class HelloController {

    @RequestMapping("/index")
    public String hello(Model model, @RequestParam(defaultValue = "Ryan") String name){
        model.addAttribute("name",name);
        return "index";
    }

    @ResponseBody
    @RequestMapping("/info")
    public Map info(@Valid @ModelAttribute("user")User user, Errors errors){

        Map map = new HashMap();
        if (errors.hasErrors()){
            map.put("error",errors.getAllErrors());
        }else{
            map.put("user",user);
        }

        return map;
    }
}

这里连个路由。一个指向模板文件index，一个返回json并添加了参数校验。

需要使用的实体类：hello.entity.User

package hello.entity;

import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;

/**
 * Created by miaorf on 2016/8/2.
 */
public class User {
    @NotNull(message = "用户名不能为空")
    @Length(min=5, max=20, message="用户名长度必须在5-20之间")
    @Pattern(regexp = "^[a-zA-Z_]\w{4,19}$", message = "用户名必须以字母下划线开头，可由字母数字下划线组成")
    private String name;
    @NotNull(message = "age不能为空")
    private int age;
    @NotNull(message = "sex不能为空")
    private String sex;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

需要用到的模板文件：src/resources/templates/index.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Getting Started: Serving Web Content</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<p th:text="'Hello, ' + ${name} + '!'" />
</body>
</html>

github: https://github.com/chenxing12/spring-boot-demo