Spring Boot常见企业开发场景应用、自动配置原理结构分析（二）-阿里云开发者社区

Spring Boot常见企业开发场景应用、自动配置原理结构分析（一）https://developer.aliyun.com/article/1423059

编写DAO

public interface UserDao {
 User get(int id);
 List findAll();
 void add(User user);
}
@Repository
public class UserDaoImpl extends HibernateDaoSupport implements UserDao{
 // 注入SessionFactory
 @Autowired
 public void autoWiredFactory(SessionFactory sessionFactory) {
  super.setSessionFactory(sessionFactory);
 }
 @Override
 public User get(int id) {
  return getHibernateTemplate().get(User.class, id);
 }
 @Override
 public List findAll() {
  return getHibernateTemplate().findByExample(new User());
 }
 @Override
 public void add(User user) {
  getHibernateTemplate().save(user);
 }
}

编写Service

public interface UserService {
 /**
  * 根据ID获取用户
  * @param i
  * @return
  */
 User get(int id);
 /**
  * 查询所有用户
  * @return
  */
 List findAll();
 /**
  * 新增用户
  * @param user
  */
 void add(User user);
}
@Service
@Transactional
public class UserServiceImpl implements UserService{
 @Autowired
 private UserDao userDao;
 @Override
 public User get(int id) {
  return userDao.get(id);
 }
 @Override
 public List findAll() {
  return userDao.findAll();
 }
 @Override
 public void add(User user) {
  userDao.add(user);
 }
}

编写Controller/Handler

@Controller
@RequestMapping("/user")
public class UserController {
 @Autowired
 private UserService userService;
 @RequestMapping("/findUserList")
 public String findUserList(Model model) {
  List list = userService.findAll();
  model.addAttribute("list", list);
  return "/index.jsp";
 }
}

JSP页面参见Servlet/JSP案例
编写Spring Boot入口

@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class);
 }
 @Bean
 @ConfigurationProperties(prefix="c3p0")
 public ComboPooledDataSource c3p0DataSource() throws PropertyVetoException {
  return new ComboPooledDataSource();
 }
 @Bean
 @ConfigurationProperties(prefix="hibernate")
 public LocalSessionFactoryBean sessionFactory() throws PropertyVetoException {
  LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
  sessionFactoryBean.setDataSource(c3p0DataSource());
  return sessionFactoryBean;
 }
 @Bean
 public HibernateTransactionManager transactionManager() throws PropertyVetoException {
  HibernateTransactionManager tx = new HibernateTransactionManager();
  tx.setSessionFactory(sessionFactory().getObject());
  return tx;
 }
}

注意：此处因为Hibernate没有Starter起步依赖，所以我使用了Java配置来整合Hibernate。第一个Bean是C3P0数据源，第二个Bean是SessionFactory，第三个Bean是事务管理器。
编写配置文件

server.port=10086
server.context-path=/
c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.jdbcUrl=jdbc:mysql:///springboot
c3p0.user=root
c3p0.password=000000
hibernate.packagesToScan=com.itheima.springboot.entity

构建SSM应用（Spring、Spring MVC、MyBatis）

为了简单起见，这里使用逆向工程生成实体类、Mapper接口、Mapper映射文件。因为查询实体、映射文件的代码比较长，这里就不把代码贴上来了，大家自己使用逆向工程生成下就OK。

导入依赖

org.springframework.boot
    spring-boot-starter-parent
    1.5.14.RELEASE
        org.springframework.boot
        spring-boot-starter-web
        org.springframework.boot
        spring-boot-starter-jdbc
        org.mybatis.spring.boot
        mybatis-spring-boot-starter
        1.3.1
        org.apache.tomcat.embed
        tomcat-embed-jasper
        provided
        mysql
        mysql-connector-java
        5.1.6
        javax.servlet
        jstl

Service代码

public interface UserService {
 /**
  * 根据ID获取用户
  * @param i
  * @return
  */
 TUser get(int id);
 /**
  * 查询所有用户
  * @return
  */
 List findAll();
 /**
  * 新增用户
  * @param user
  */
 void add(TUser user);
}
@Service
@Transactional
public class UserServiceImpl implements UserService{
 @Autowired
 private TUserMapper userMapper;
 @Override
 public TUser get(int id) {
  return userMapper.selectByPrimaryKey(id);
 }
 @Override
 public List findAll() {
  return userMapper.selectByExample(null);
 }
 @Override
 public void add(TUser user) {
  userMapper.insert(user);
 }
}

Controller代码

@Controller
@RequestMapping("/user")
public class UserController {
 @Autowired
 private UserService userService;
 @RequestMapping("/findUserList")
 public String findUserList(Model model) {
  List list = userService.findAll();
  model.addAttribute("list", list);
  return "/index.jsp";
 }
}

Spring Boot入口应用

@SpringBootApplication
@MapperScan(basePackages="com.itheima.springboot.mapper")
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class);
 }
}

注意：Spring Boot整合MyBatis需要在Application类上添加@MapperScan，否则不会为Mapper创建代理对象，执行程序失败。
配置文件

server.port=10086
server.context-path=/
#数据库配置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql:///springboot
spring.datasource.username=root
spring.datasource.password=000000

这里使用默认的数据源，如果想要使用其他的数据源参照之前的配置即可
访问http://localhost:10086/user/findUserList

构建SSJPA应用（Spring、Spring MVC、Spring Data JPA）

导入Maven依赖

org.springframework.boot
    spring-boot-starter-parent
    1.5.14.RELEASE
        org.springframework.boot
        spring-boot-starter-web
        org.springframework.boot
        spring-boot-starter-data-jpa
        mysql
        mysql-connector-java
        5.1.6
        javax.servlet
        jstl
        org.apache.tomcat.embed
        tomcat-embed-jasper
        c3p0
        c3p0
        0.9.1

注意：导入了spring-boot-starter-data-jpa依赖
编写Java实体类，参考SSH整合JPA实体类
编写DAO

public interface UserRepository extends JpaRepository{
}

（这个代码是真的喜欢）
编写Service

public interface UserService {
 /**
  * 根据ID获取用户
  * @param i
  * @return
  */
 User get(int id);
 /**
  * 查询所有用户
  * @return
  */
 List findAll();
 /**
  * 新增用户
  * @param user
  */
 void add(User user);
}
1. 编写Controller
@Controller
@RequestMapping("/user")
public class UserController {
 @Autowired
 private UserService userService;
 @RequestMapping("/findUserList")
 public String findUserList(Model model) {
  List list = userService.findAll();
  model.addAttribute("list", list);
  return "/index.jsp";
 }
}
1. 编写入口
@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class);
 }
 @Bean(name="datasource")
 @Primary
 @ConfigurationProperties(prefix="c3p0")
 public ComboPooledDataSource c3p0DataSource() throws PropertyVetoException {
  return new ComboPooledDataSource();
 }
}
1. 配置文件
server.port=10086
server.context-path=/
c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.jdbcUrl=jdbc:mysql:///springboot
c3p0.user=root
c3p0.password=000000
构建FreeMarker应用程序
1. 导入依赖
  org.springframework.boot
  spring-boot-starter-parent
  1.5.14.RELEASE
   org.springframework.boot
   spring-boot-starter-web
   org.springframework.boot
   spring-boot-starter-data-jpa
   mysql
   mysql-connector-java
   5.1.6
   javax.servlet
   jstl
   org.apache.tomcat.embed
   tomcat-embed-jasper
   c3p0
   c3p0
   0.9.1
   org.springframework.boot
   spring-boot-starter-freemarker

多导入了spring-boot-starter-freemarker起步依赖
编写DAO

public interface UserRepository extends JpaRepository{
}
1. 编写Service
public interface UserService {
 /**
  * 根据ID获取用户
  * @param i
  * @return
  */
 User get(int id);
 /**
  * 查询所有用户
  * @return
  */
 List findAll();
 /**
  * 新增用户
  * @param user
  */
 void add(User user);
}
@Service
@Transactional
public class UserServiceImpl implements UserService{
 @Autowired
 private UserRepository userRepository;
 @Override
 public User get(int id) {
  return userRepository.findOne(id);
 }
 @Override
 public List findAll() {
  return userRepository.findAll();
 }
 @Override
 public void add(User user) {
  userRepository.save(user);
 }
}
1. 编写Controller
@Controller
@RequestMapping("/user")
public class UserController {
 // 静态页面输出到的目录
 @Value("${freemarker.output_path}")
 private String OUTPUT_PATH;
 @Autowired
 private UserService userService;
    // 获取FreeMarker配置类
 @Autowired
 private Configuration configuration;
 @RequestMapping("/genPage")
 @ResponseBody
 public Map genPage() throws Exception {
  List list = userService.findAll();
  Map model = new HashMap();
  model.put("list", list);
  Template template = configuration.getTemplate("user_list.ftl");
  template.process(model, new FileWriter(OUTPUT_PATH + "userList.html"));
  Map result = new HashMap();
  result.put("success", true);
  result.put("message", "生成页面成功!");
  return result;
 }
}
1. 编写入口
@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class);
 }
 @Bean(name="datasource")
 @Primary
 @ConfigurationProperties(prefix="c3p0")
 public ComboPooledDataSource c3p0DataSource() throws PropertyVetoException {
  return new ComboPooledDataSource();
 }
}
1. 编写配置文件
server.port=10086
server.context-path=/
# FreeMarker静态页面输出目录
freemarker.output_path=G:/workspace/free_test/t49/src/main/webapp/
c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.jdbcUrl=jdbc:mysql:///springboot
c3p0.user=root
c3p0.password=000000
1. 编写FreeMarker模板，此模板默认放在classpath下的template/user_list.ftl中
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
JSP测试
  <#list list as user>
ID
用户名
密码
${user.id}
${user.username}
${user.password}
1. 访问http://localhost:10086/user/genPage，然后检查HTML页面是否生成
构建基于Redis缓存应用程序
1. 导入依赖
 org.springframework.boot
 spring-boot-starter-parent
 1.5.14.RELEASE
 1.8
 org.springframework.boot
 spring-boot-starter-web
 org.springframework.boot
 spring-boot-starter-data-jpa
 mysql
 mysql-connector-java
 5.1.6
 javax.servlet
 jstl
 org.apache.tomcat.embed
 tomcat-embed-jasper
 c3p0
 c3p0
 0.9.1
 org.springframework.boot
 spring-boot-starter-data-redis
1. 要开发导入Redis起步依赖spring-boot-starter-data-redis
2. 编写DAO
 public interface UserRepository extends JpaRepository{
 }
1. 编写Service
public interface UserService {
 /**
  * 根据ID获取用户
  * @param i
  * @return
  */
 User get(int id);
 /**
  * 查询所有用户
  * @return
  */
 List findAll();
 /**
  * 新增用户
  * @param user
  */
 void add(User user);
}
@Service
@Transactional
public class UserServiceImpl implements UserService{
 @Autowired
 private UserRepository userRepository;
 @Autowired
 private RedisTemplate redisTemplate;
 @Override
 public User get(int id) {
  return userRepository.findOne(id);
 }
 @Override
 public List findAll() {
  Long size = redisTemplate.boundListOps("userList").size();
  List userList = redisTemplate.boundListOps("userList").range(0, size);
  if(userList == null || size == 0) {
   System.out.println("从数据库中获取数据...");
   userList = userRepository.findAll();
   System.out.println("将数据放入缓存...");
   redisTemplate.boundListOps("userList").rightPushAll(userList.toArray(new User[0]));
   return userList;
  }
  else {
   System.out.println("从缓存中获取数据...");
   return userList;
  }
 }
 @Override
 public void add(User user) {
  userRepository.save(user);
 }
}
1. 编写Controller
@Controller
@RequestMapping("/user")
public class UserController {
 @Value("${freemarker.output_path}")
 private String OUTPUT_PATH;
 @Autowired
 private UserService userService;
 @RequestMapping("/findUserList")
 public String findUserList(Model model) {
  List list = userService.findAll();
  model.addAttribute("list", list);
  return "/index.jsp";
 }
}
1. 编写Spring Boot入口
@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class);
 }
 @Bean(name="datasource")
 @Primary
 @ConfigurationProperties(prefix="c3p0")
 public ComboPooledDataSource c3p0DataSource() throws PropertyVetoException {
  ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
  return comboPooledDataSource;
 }
}
1. 编写配置文件
server.port=10086
server.context-path=/
c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.jdbcUrl=jdbc:mysql:///springboot
c3p0.user=root
c3p0.password=000000
1. 启动Redis
2. 访问http://localhost:10086/user/findUserList，注意控制台的变化
构建基于ActiveMQ消息队列应用程序
1. 导入依赖
 org.springframework.boot
 spring-boot-starter-parent
 1.5.14.RELEASE
 org.springframework.boot
 spring-boot-starter-web
 org.springframework.boot
 spring-boot-starter-data-jpa
 mysql
 mysql-connector-java
 5.1.6
 javax.servlet
 jstl
 org.apache.tomcat.embed
 tomcat-embed-jasper
 c3p0
 c3p0
 0.9.1
 org.springframework.boot
 spring-boot-starter-freemarker
 org.springframework.boot
 spring-boot-starter-activemq
 com.alibaba
 fastjson
 1.2.28

Spring Boot常见企业开发场景应用、自动配置原理结构分析（三）https://developer.aliyun.com/article/1423061

Spring Boot常见企业开发场景应用、自动配置原理结构分析（二）

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