springboot---数据整合篇

本文讲解 Spring Boot 基础下，如何使用 JDBC，配置数据源和通过 JdbcTemplate 编写数据访问。

环境依赖

修改 POM 文件，添加spring-boot-starter-jdbc依赖。

1. <dependency>
2. <groupId>org.springframework.boot</groupId>
3. <artifactId>spring-boot-starter-jdbc</artifactId>
4. </dependency>

添加mysql依赖。

1. <dependency>
2. <groupId>mysql</groupId>
3. <artifactId>mysql-connector-java</artifactId>
4. <version>5.1.35</version>
5. </dependency>
6. <dependency>
7. <groupId>com.alibaba</groupId>
8. <artifactId>druid</artifactId>
9. <version>1.0.14</version>
10. </dependency>

数据源

方案一 使用 Spring Boot 默认配置

使用 Spring Boot 默认配置，不需要在创建 dataSource 和 jdbcTemplate 的 Bean。

在 src/main/resources/application.properties 中配置数据源信息。

1. spring.datasource.driver-class-name=com.mysql.jdbc.Driver
2. spring.datasource.url=jdbc:mysql://localhost:3307/springboot_db
3. spring.datasource.username=root
4. spring.datasource.password=root

方案二 手动创建

在 src/main/resources/config/source.properties 中配置数据源信息。

1. # mysql
2. source.driverClassName = com.mysql.jdbc.Driver
3. source.url = jdbc:mysql://localhost:3306/springboot_db
4. source.username = root
5. source.password = root

通过 Java Config 创建 dataSource 和jdbcTemplate。

1. @Configuration
2. @EnableTransactionManagement
3. @PropertySource(value = {"classpath:config/source.properties"})
4. public class BeanConfig {
5.  
6. @Autowired
7. private Environment env;
8.  
9. @Bean(destroyMethod = "close")
10. public DataSource dataSource() {
11. DruidDataSource dataSource = new DruidDataSource();
12. dataSource.setDriverClassName(env.getProperty("source.driverClassName").trim());
13. dataSource.setUrl(env.getProperty("source.url").trim());
14. dataSource.setUsername(env.getProperty("source.username").trim());
15. dataSource.setPassword(env.getProperty("source.password").trim());
16. return dataSource;
17. }
18.  
19. @Bean
20. public JdbcTemplate jdbcTemplate() {
21. JdbcTemplate jdbcTemplate = new JdbcTemplate();
22. jdbcTemplate.setDataSource(dataSource());
23. return jdbcTemplate;
24. }
25. }

脚本初始化

先初始化需要用到的SQL脚本。

1. CREATE DATABASE /*!32312 IF NOT EXISTS*/`springboot_db` /*!40100 DEFAULT CHARACTER SET utf8 */;
2.  
3. USE `springboot_db`;
4.  
5. DROP TABLE IF EXISTS `t_author`;
6.  
7. CREATE TABLE `t_author` (
8. `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '用户ID',
9. `real_name` varchar(32) NOT NULL COMMENT '用户名称',
10. `nick_name` varchar(32) NOT NULL COMMENT '用户匿名',
11. PRIMARY KEY (`id`)
12. ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

使用JdbcTemplate操作

实体对象

1. public class Author {
2. private Long id;
3. private String realName;
4. private String nickName;
5. // SET和GET方法
6. }

DAO相关

1. public interface AuthorDao {
2. int add(Author author);
3. int update(Author author);
4. int delete(Long id);
5. Author findAuthor(Long id);
6. List<Author> findAuthorList();
7. }

我们来定义实现类，通过JdbcTemplate定义的数据访问操作。

1. @Repository
2. public class AuthorDaoImpl implements AuthorDao {
3.  
4. @Autowired
5. private JdbcTemplate jdbcTemplate;
6.  
7. @Override
8. public int add(Author author) {
9. return jdbcTemplate.update("insert into t_author(real_name, nick_name) values(?, ?)",
10. author.getRealName(), author.getNickName());
11. }
12.  
13. @Override
14. public int update(Author author) {
15. return jdbcTemplate.update("update t_author set real_name = ?, nick_name = ? where id = ?",
16. new Object[]{author.getRealName(), author.getNickName(), author.getId()});
17. }
18.  
19. @Override
20. public int delete(Long id) {
21. return jdbcTemplate.update("delete from t_author where id = ?", id);
22. }
23.  
24. @Override
25. public Author findAuthor(Long id) {
26. List<Author> list = jdbcTemplate.query("select * from t_author where id = ?", new Object[]{id}, new BeanPropertyRowMapper(Author.class));
27. if(null != list && list.size()>0){
28. Author auhtor = list.get(0);
29. return auhtor;
30. }else{
31. return null;
32. }
33. }
35. @Override
36. public List<Author> findAuthorList() {
37. List<Author> list = jdbcTemplate.query("select * from t_author", new Object[]{}, new BeanPropertyRowMapper<Author>(Author.class));
38. return list;
39. }
40. }

Service相关

1. public interface AuthorService {
2. int add(Author author);
3. int update(Author author);
4. int delete(Long id);
5. Author findAuthor(Long id);
6. List<Author> findAuthorList();
7. }

我们来定义实现类，Service层调用Dao层的方法，这个是典型的套路。

1. @Service("authorService")
2. public class AuthorServiceImpl implements AuthorService {
3. @Autowired
4. private AuthorDao authorDao;
5.  
6. @Override
7. public int add(Author author) {
8. return this.authorDao.add(author);
9. }
10.  
11. @Override
12. public int update(Author author) {
13. return this.authorDao.update(author);
14. }
15.  
16. @Override
17. public int delete(Long id) {
18. return this.authorDao.delete(id);
19. }
20.  
21. @Override
22. public Author findAuthor(Long id) {
23. return this.authorDao.findAuthor(id);
24. }
25.  
26. @Override
27. public List<Author> findAuthorList() {
28. return this.authorDao.findAuthorList();
29. }
30. }

Controller相关

为了展现效果，我们先定义一组简单的　RESTful API 接口进行测试。

1. @RestController
2. @RequestMapping(value="/data/jdbc/author")
3. public class AuthorController {
4. @Autowired
5. private AuthorService authorService;
6. /**
7. * 查询用户列表
8. */
9. @RequestMapping(method = RequestMethod.GET)
10. public Map<String,Object> getAuthorList(HttpServletRequest request) {
11. List<Author> authorList = this.authorService.findAuthorList();
12. Map<String,Object> param = new HashMap<String,Object>();
13. param.put("total", authorList.size());
14. param.put("rows", authorList);
15. return param;
16. }
17. /**
18. * 查询用户信息
19. */
20. @RequestMapping(value = "/{userId:\d+}", method = RequestMethod.GET)
21. public Author getAuthor(@PathVariable Long userId, HttpServletRequest request) {
22. Author author = this.authorService.findAuthor(userId);
23. if(author == null){
24. throw new RuntimeException("查询错误");
25. }
26. return author;
27. }
28.  
29. /**
30. * 新增方法
31. */
32. @RequestMapping(method = RequestMethod.POST)
33. public void add(@RequestBody JSONObject jsonObject) {
34. String userId = jsonObject.getString("user_id");
35. String realName = jsonObject.getString("real_name");
36. String nickName = jsonObject.getString("nick_name");
37. Author author = new Author();
38. if (author!=null) {
39. author.setId(Long.valueOf(userId));
40. }
41. author.setRealName(realName);
42. author.setNickName(nickName);
43. try{
44. this.authorService.add(author);
45. }catch(Exception e){
46. e.printStackTrace();
47. throw new RuntimeException("新增错误");
48. }
49. }
50. /**
51. * 更新方法
52. */
53. @RequestMapping(value = "/{userId:\d+}", method = RequestMethod.PUT)
54. public void update(@PathVariable Long userId, @RequestBody JSONObject jsonObject) {
55. Author author = this.authorService.findAuthor(userId);
56. String realName = jsonObject.getString("real_name");
57. String nickName = jsonObject.getString("nick_name");
58. author.setRealName(realName);
59. author.setNickName(nickName);
60. try{
61. this.authorService.update(author);
62. }catch(Exception e){
63. e.printStackTrace();
64. throw new RuntimeException("更新错误");
65. }
66. }
67. /**
68. * 删除方法
69. */
70. @RequestMapping(value = "/{userId:\d+}", method = RequestMethod.DELETE)
71. public void delete(@PathVariable Long userId) {
72. try{
73. this.authorService.delete(userId);
74. }catch(Exception e){
75. throw new RuntimeException("删除错误");
76. }
77. }
78. }

总结

通过，上面这个简单的案例，我们发现 Spring Boot 仍然秉承了 Spring 框架的一贯套路，并简化 Spring 应用的初始搭建以及开发过程。