Maven工程搭建spring boot+spring mvc+JPA

添加Spring boot支持，引入相关包：

1、maven工程，少不了pom.xml，spring boot的引入可参考官网：

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
   </parent>

  <dependencies>

     <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <scope>provided</scope><!-- 编译需要而发布不需要的jar包 -->
    </dependency>  

     <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
    </dependency>  

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

            <!--jpa的jar包 ，操作数据库的-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

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

        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
         <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-core</artifactId>
            <version>1.2.2</version>
        </dependency>
       <dependency>
           <groupId>org.apache.shiro</groupId>
           <artifactId>shiro-spring</artifactId>
           <version>1.2.2</version>
       </dependency>
        <!-- shiro ehcache -->
       <dependency>
           <groupId>org.apache.shiro</groupId>
           <artifactId>shiro-ehcache</artifactId>
           <version>1.2.2</version>
       </dependency>
  </dependencies>
  <build>

    <plugins>
        <plugin>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-maven-plugin</artifactId>
          <executions>
            <execution>
              <goals>
                <goal>repackage</goal>
              </goals>
            </execution>
          </executions>
        </plugin>
     </plugins>
    <finalName>name</finalName>
  </build>

2、以上代码引入了spring boot。spring mvc 和jpa，以及mysql数据库的驱动jar；

编写启动类，并加装配置文件：

1、启动类如下：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

import java.io.IOException;
import com.my.config.CommonProperties;

@SpringBootApplication
@EnableAutoConfiguration
@EnableJpaAuditing
public class Application {

    public static void main(String[] args) throws IOException{

        String loc = CommonProperties.loadProperties2System(System.getProperty("spring.config.location"));
        System.getProperties().setProperty("application.version", CommonProperties.getVersion(Application.class));
        System.getProperties().setProperty("app.home", loc + "/..");
        SpringApplication.run(Application.class, args);

    }

}

2、配置文件的位置放到classpath外边，方便在不重新打包的情况下修改，spring boot工程一般都打成jar包：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import org.springframework.util.StringUtils;

public final class CommonProperties {

    public static final String PPT_KEY_APP_HOME = "app.home";
    public static final String DEFAULT_APP_HOME = "./";

    public static final String getAppHome() {
        return System.getProperty("./", "./");
    }

    public static String loadProperties2System(String location) throws IOException {
        String configLocation = location;
        File cnf;
        if (!StringUtils.hasLength(location)) {
            configLocation = "./config";
            cnf = new File(configLocation);
            if (!cnf.exists() || !cnf.isDirectory()) {
                configLocation = "../config";
                cnf = new File(configLocation);
            }
        } else {
            cnf = new File(location);
        }

        File[] arg2 = cnf.listFiles();
        int arg3 = arg2.length;

        for (int arg4 = 0; arg4 < arg3; ++arg4) {
            File file = arg2[arg4];
            if (file.isFile() && file.getName().endsWith(".properties")) {
                Properties ppt = new Properties();
                FileInputStream fi = new FileInputStream(file);
                Throwable arg8 = null;

                try {
                    ppt.load(fi);
                    System.getProperties().putAll(ppt);
                } catch (Throwable arg17) {
                    arg8 = arg17;
                    throw arg17;
                } finally {
                    if (fi != null) {
                        if (arg8 != null) {
                            try {
                                fi.close();
                            } catch (Throwable arg16) {
                                arg8.addSuppressed(arg16);
                            }
                        } else {
                            fi.close();
                        }
                    }

                }
            }
        }

        return configLocation;
    }

    public static String getVersion(Class<?> clazz) {
        Package pkg = clazz.getPackage();
        String ver = pkg != null ? pkg.getImplementationVersion() : "undefined";
        return ver == null ? "undefined" : ver;
    }

CommonProperties.java

将配置文件放到jar包同级目录的config文件夹下，包括日志配置，application.yml文件,其他配置文件等；

编写自动配置类

用于扫描compan* ,代替spring mvc的spring.xml配置文件：

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackages = {
        "com.my.rs",
        "com.my.service",
        "com.my.repository"})
public class AppAutoConfiguration {

}

import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * 预配置
 * */
@Configuration
public class MyConfiguration extends WebMvcConfigurerAdapter{

    @Bean
    public HttpMessageConverters customConverters() {
        return new HttpMessageConverters();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //registry.addResourceHandler("/**")
         //       .addResourceLocations("classpath:/META-INF/resources/**");
    }
    

编写rs,service,repository

package com.my.rs;

import java.util.List;

import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.my.entity.User;

@RequestMapping({"/api/user"})
public interface UserRS {

    @RequestMapping(value="/add",method={RequestMethod.POST})
    @ResponseBody
    public User saveUser(@RequestBody User user);

    @RequestMapping(value="/update",method={RequestMethod.POST})
    @ResponseBody
    public User updateUser(@RequestBody User user);

    @RequestMapping(value="/delete",method={RequestMethod.POST,RequestMethod.DELETE})
    public void deleteUser(@RequestParam String[] userIds);

    @RequestMapping(value="/get",method={RequestMethod.GET})
    @ResponseBody
    public User getUser(@RequestParam String userId);

    @RequestMapping(value="/query/all",method={RequestMethod.GET})
    public List<User> queryAll();

    @RequestMapping(value="/query/byName",method={RequestMethod.GET})
    public List<User> queryByName(@RequestParam String name);

    @RequestMapping(value="/query/byParentId",method={RequestMethod.GET})
    public List<User> queryChildren(@RequestParam String parentId);

    //无参数分页查询
    @RequestMapping(value="/query/page",method={RequestMethod.GET})
    public List<User> queryByPage(@RequestParam int pageNo,
            @RequestParam int pageSize,
            @RequestBody(required=false) User user);
}

UserRS.java

package com.my.rs.impl;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.my.entity.User;
import com.my.rs.UserRS;
import com.my.service.UserService;

@RestController
public class UserRSImpl implements UserRS{

    public static Logger logger = LoggerFactory.getLogger(UserRSImpl.class);

    @Autowired
    UserService _userService;

    @Override
    public User saveUser(@RequestBody User user){
        try {
            return _userService.save(user);
        } catch (Throwable e) {
            logger.error(e.getMessage(),e);
            throw e;
        }
    }

    @Override
    public User updateUser(@RequestBody User user) {
        return _userService.update(user);
    }

    @Override
    public void deleteUser(String[] userIds) {
        for (String userId : userIds) {
            _userService.deleteById(userId);
        }
    }

    @Override
    public List<User> queryAll() {
        return _userService.queryAll();
    }

    @Override
    public List<User> queryByName(String name) {
        return _userService.findByName(name);
    }

    @Override
    public List<User> queryChildren(String parentId) {
        return _userService.findByParentId(parentId);
    }

    @Override
    public User getUser(String userId) {
        return _userService.findById(userId);
    }

    @Override
    public List<User> queryByPage(int pageNo, int pageSize, User user) {

        return null;
    }

}

UserRSImpl .java

package com.my.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.my.entity.User;
import com.my.repository.UserRepository;

@Service
public class UserService extends BaseService<User>{

    @Autowired
    UserRepository _userRepository;

    public List<User> findByName(String name){
        return _userRepository.findByName(name);
    }

    public List<User> findByParentId(String parentId){
        return _userRepository.findByParentId(parentId);
    }

}

UserService.java

package com.my.repository;

import java.util.List;

import com.my.entity.User;

public interface UserRepository extends BaseRepository<User>{

    List<User> findByName(String name);

    List<User> findByParentId(String parentId);
}

以上采用了分层模式，有点繁琐，但是对之后修改每层的业务逻辑比较方便

JPA相关的类如下：

package com.my.service;

import java.io.Serializable;

import javax.persistence.EntityManager;
import javax.transaction.Transactional;

import org.springframework.beans.factory.annotation.Autowired;

import com.my.repository.BaseRepository;

/**
 * 一些共有的方法放这里
 * */
@Transactional
public class BaseService<E extends Serializable> {

    @Autowired
    BaseRepository<E> _baseRepository;

    @Autowired
    EntityManager em;

    public E save(E baseUnit){
        return _baseRepository.saveAndFlush(baseUnit);
    }

    public E update(E baseUnit){
        return _baseRepository.saveAndFlush(baseUnit);
    }

    public void deleteById(String id) {
        _baseRepository.delete(id);
    }

    public java.util.List<E> queryAll(){
        return _baseRepository.findAll();
    }

    public E findById(String id){
        return _baseRepository.getOne(id);
    }
}

package com.my.repository;

import java.io.Serializable;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.NoRepositoryBean;

@NoRepositoryBean
public interface BaseRepository<E> extends JpaRepository<E, Serializable>{

}

实体类：与数据库字段相关，需要注意下父类中的注解@MappedSuperclass

package com.my.entity;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.ManyToMany;

import org.hibernate.annotations.DynamicInsert;
import org.hibernate.annotations.DynamicUpdate;
import org.hibernate.validator.constraints.Email;

@Entity(name = "db_user")
@DynamicInsert
@DynamicUpdate
public class User extends BaseUnit {

    /**
     * 账户状态
     */
    public static enum AccountStatus {
        /**
         * 正常
         */
        Enable, //
        /**
         * 停用
         */
        Disable
    }

    private static final long serialVersionUID = -3101319619397064425L;

    private String password;

    private String salt;

    /** 账户状态 */
    private AccountStatus status;

    /** 认证邮箱 */
    @Email(message = "User.email属性必须符合邮箱格式")
    private String email;

    /** 移动电话号码 */
    private String mobileNo;

    /** 身份证号码 */
    private String cardId;

    @ManyToMany(targetEntity=Role.class)
    private List<String> roleIds;

    /** 昵称。可选。 */
    private String nickName;

    public String getCardId() {
        return cardId;
    }

    public String getEmail() {
        return email;
    }

    public String getMobileNo() {
        return mobileNo;
    }

    public String getNickName() {
        return nickName;
    }

    public String getPassword() {
        return password;
    }

    public List<String> getRoleIds() {
        if (roleIds == null) {
            roleIds = new ArrayList<>();
        }
        return roleIds;
    }

    public String getSalt() {
        return salt;
    }

    public AccountStatus getStatus() {
        return status;
    }

    public void setCardId(String cardId) {
        this.cardId = cardId;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public void setMobileNo(String mobileNo) {
        this.mobileNo = mobileNo;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setRoleIds(List<String> roleIds) {
        this.roleIds = roleIds;
    }

    public void setSalt(String salt) {
        this.salt = salt;
    }

    public void setStatus(AccountStatus status) {
        this.status = status;
    }

}

User.java

package com.my.entity;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import org.springframework.data.annotation.CreatedBy;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.LastModifiedBy;
import org.springframework.data.annotation.LastModifiedDate;

@MappedSuperclass
public class BaseUnit implements Serializable {

    @Id
    @NotNull
    public String id;
    /**
     * 父单元ID
     */
    @Size(max = 32, message = "BaseUnit.parentId属性长度不能大于32")
    public String parentId;

    /** 父单元的类型 */
    public ParentType parentType;

    /**
     * 单元的名称
     */
    @NotNull(message = "BaseUnit.name属性不能为空")
    public String name;

    @CreatedBy
    public String createBy;

    @CreatedDate
    public Date createDate;

    @LastModifiedBy
    public String lastModifiedBy;        

    /**
     * 最后更新日期
     */
    @LastModifiedDate
    public Date lastModifiedDate;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    /**
     * 获取单元的名称
     *
     * @return 必填
     */
    public String getName() {
        return name;
    }

    /**
     *
     *
     * @return UUID，不含{}和-
     */
    public String getParentId() {
        return parentId;
    }

    public ParentType getParentType() {
        return parentType;
    }

    public String getStationId() {
        return stationId;
    }

    public String getThumbnailId() {
        return thumbnailId;
    }

    public String getCreateBy() {
        return createBy;
    }

    public void setCreateBy(String createBy) {
        this.createBy = createBy;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }
    /**
     * 设置单元的名称
     *
     * @param name
     *            必填
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 设置父单元ID
     *
     * @param parentId
     *            UUID，不含{}和-
     */
    public void setParentId(String parentId) {
        this.parentId = parentId;
    }

    public String getLastModifiedBy() {
        return lastModifiedBy;
    }

    public void setLastModifiedBy(String lastModifiedBy) {
        this.lastModifiedBy = lastModifiedBy;
    }

    public Date getLastModifiedDate() {
        return lastModifiedDate;
    }

    public void setLastModifiedDate(Date lastModifiedDate) {
        this.lastModifiedDate = lastModifiedDate;
    }
}

配置文件：

server:
  port: 16800
  contextPath: /

logging:
  config: ./config/logback.xml

spring:
  http:
    multipart:
      enabled: false
  datasource:
    url : jdbc:mysql://127.0.0.1:3306/db?useUnicode=true&characterEncoding=utf-8
    username : root
    password : 123456
    driverClassName : com.mysql.jdbc.Driver
  jpa:
    database : MYSQL
    show-sql : true
    hibernate:
      ddl-auto : update
  jackson:
    serialization:
      INDENT_OUTPUT : true

#hibernate:配置了实体类维护数据库表结构的具体行为，update表示当实体类的属性发生变化时，表结构跟着更新，
这里我们也可以取值create，这个create表示启动的时候删除上一次生成的表，并根据实体类重新生成表，
这个时候之前表中的数据就会被清空；还可以取值create-drop，这个表示启动时根据实体类生成表，但是当sessionFactory关闭的时候表会被删除；
validate表示启动时验证实体类和数据表是否一致；none表示啥都不做。
#show-sql表示hibernate在操作的时候在控制台打印真实的sql语句
#jackson表示格式化输出的json字符串