spring boot 搭建环境入门

spring boot 习惯大于配置 比springMVC简介很多，开发过成功免去了烦人的XML配置。项目采用的导出jar包的方式配置（jar依赖内置tomcat），maven管理依赖，pom配置如下：

<parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>1.5.4.RELEASE</version></parent>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <java.version>1.8</java.version>  </properties>    <dependencies>    <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-actuator</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>    <dependency>          <groupId>org.apache.poi</groupId>          <artifactId>poi</artifactId>          <version>3.11</version>      </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-jdbc</artifactId>    </dependency></dependencies>  <build>    <plugins>      <plugin>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-maven-plugin</artifactId>      </plugin>    </plugins>  </build>

spring boot 配置文件：application.properties（放置在项目src文件下即可），前2个配置就是允许无密码访问shutdown，关闭由main启动jar包。

#\u542F\u7528shutdownendpoints.shutdown.enabled=true#\u7981\u7528\u5BC6\u7801\u9A8C\u8BC1endpoints.shutdown.sensitive=falseserver.port=80spring.datasource.url = jdbc:mysql://localhost:3306/testspring.datasource.username = rootspring.datasource.password = ****spring.datasource.driverClassName = com.mysql.jdbc.Driver# Specify the DBMS  spring.jpa.database = MYSQL# Show or not log for each sql query  spring.jpa.show-sql = true# Hibernate ddl auto (create, create-drop, update)  spring.jpa.hibernate.ddl-auto = update# Naming strategy  spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy# stripped before adding them to the entity manager)  spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialectspring.thymeleaf.cache=false

上面2个文件就已经配置好了spring boot，下面实现具体功能。

实体类：如果没有在数据库建表和字段，实体类可自动创建：（可使用注视配置字段长度、是否为空等）

import java.math.BigDecimal;import java.util.Date;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;@Entitypublic class User {@Id@GeneratedValue(strategy = GenerationType.AUTO)private int id;private String name;private int height1;private int sex;private Date birthday;private Date sendtime; // 日期类型，格式：yyyy-MM-dd HH:mm:ssprivate BigDecimal price;private float floatprice;private double doubleprice;public int getId() {return id;}public String getName() {return name;}public int getHeight1() {return height1;}public int getSex() {return sex;}public Date getBirthday() {return birthday;}public Date getSendtime() {return sendtime;}public BigDecimal getPrice() {return price;}public float getFloatprice() {return floatprice;}public double getDoubleprice() {return doubleprice;}public void setId(int id) {this.id = id;}public void setName(String name) {this.name = name;}public void setHeight1(int height1) {this.height1 = height1;}public void setSex(int sex) {this.sex = sex;}public void setBirthday(Date birthday) {this.birthday = birthday;}public void setSendtime(Date sendtime) {this.sendtime = sendtime;}public void setPrice(BigDecimal price) {this.price = price;}public void setFloatprice(float floatprice) {this.floatprice = floatprice;}public void setDoubleprice(double doubleprice) {this.doubleprice = doubleprice;}}

数据操作接口类

import org.springframework.data.repository.CrudRepository;public interface UserRespositroy extends CrudRepository<User , Integer> {User findUserById(Integer id);}

controller控制器：

import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;@Controller@EnableAutoConfigurationpublic class DemoController {@AutowiredUserRespositroy userRespositroy;@RequestMapping("/")    @ResponseBody    String home() {        return "Hello World!";    }@RequestMapping("/hello")//@ResponseBodypublic String hello(Map<String,Object> map){Iterable<User> user = userRespositroy.findAll();for(User u : user){System.out.println(u.getDoubleprice());}map.put("key", "11111111111111111");return "/hello";}    public static void main(String[] args) throws Exception {        SpringApplication.run(DemoController.class, args);    }}

模板：

在src下建立文件夹main/resources/templates，把hello.html放置在里面即可