Spring SSM整合
Spring SpringMvc Mybatis 整合
一. 配置类
1.1、 Spring配置类
@Configuration
@ComponentScan({"com.itheima.service"})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class, MybatisConfig.class})
@EnableTransactionManagement
public class SpringConfig {
}
- @EnableTransactionManagement开启事务
1.2、SpringMvcConfig配置类
@Configuration
@ComponentScan("com.itheima.controller")
@EnableWebMvc
public class SpringMvcConfig {
}1.3. ServletConfig配置类
public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
protected Class[] getRootConfigClasses() {
return new Class[]{SpringConfig.class};
}
protected Class[] getServletConfigClasses() {
return new Class[]{SpringMvcConfig.class};
}
protected String[] getServletMappings() {
return new String[]{"/"};
}
// 乱码处理
@Override
protected Filter[] getServletFilters() {
CharacterEncodingFilter filter = new CharacterEncodingFilter();
filter.setEncoding("UTF-8");
return new Filter[]{filter};
}
}1.4. JdbcConfig配置类
public class JdbcConfig {
@Value("${jdbc.driver}")
private String driver;
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String username;
@Value("${jdbc.password}")
private String password;
@Bean
public DataSource dataSource(){
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
@Bean
public PlatformTransactionManager transactionManager(DataSource dataSource){
DataSourceTransactionManager ds = new DataSourceTransactionManager();
ds.setDataSource(dataSource);
return ds;
}
}- 配置类内方法需要 使用@Bean注解， 注入到Spring中
1.5、Mybatis配置类
public class MybatisConfig {
@Bean
public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
factoryBean.setTypeAliasesPackage("com.itheima.domain");
return factoryBean;
}
@Bean
public MapperScannerConfigurer mapperScannerConfigurer(){
MapperScannerConfigurer msc = new MapperScannerConfigurer();
msc.setBasePackage("com.itheima.dao");
return msc;
}
}- 这里需要设置domain 和dao 层
1.6、jdbc配置文件 jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/spring_db
jdbc.username=root
jdbc.password=mima1234二、业务层
2.1、domain层
public class Book {
private Integer id;
private String type;
private String name;
private String description;
@Override
public String toString() {
return "Book{" +
"id=" + id +
", type='" + type + '\'' +
", name='" + name + '\'' +
", description='" + description + '\'' +
'}';
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
2.2、Dao层
public interface BookDao {
//@Insert("insert into tbl_book values(null, #{type}, #{name}, #{description})")
// 占位符表示的是book中的属性名
@Insert("insert into tbl_book(type, name, description) values(#{type}, #{name}, #{description})")
public void save(Book book);
@Update("update tbl_book set type = #{type}, name = #{name}, description = #{description} where id = #{id}")
public void update(Book book);
@Delete("delete from tbl_book where id = #{id}")
public void delete(Integer id);
@Select("select * from tbl_book where id = #{id}")
public Book getById(Integer id);
@Select("select * from tbl_book")
public List getAll();
}
2.3、Service接口和实现类
@Transactional
public interface BookService {
/**
* 保存
* @param book
* @return
*/
public boolean save(Book book);
/**
* 修改
* @param book
* @return
*/
public boolean update(Book book);
/**
* 根据ID删除
* @param id
* @return
*/
public boolean delete(Integer id);
/**
* 根据ID查询
* @param id
* @return
*/
public Book getById(Integer id);
/**
* 查询全部
* @return
*/
public List getAll();
}
@Service
public class BookServiceImpl implements BookService {
@Autowired
private BookDao bookDao;
public boolean save(Book book) {
bookDao.save(book);
return true;
}
public boolean update(Book book) {
bookDao.update(book);
return true;
}
public boolean delete(Integer id) {
bookDao.delete(id);
return false;
}
public Book getById(Integer id) {
return bookDao.getById(id);
}
public List getAll() {
return bookDao.getAll();
}
}
2.4、控制器类
@RestController
@RequestMapping("/books")
public class BookController {
@Autowired
private BookService bookService;
@PostMapping
public boolean save(@RequestBody Book book) {
return bookService.save(book);
}
@PutMapping
public boolean update(@RequestBody Book book) {
return bookService.update(book);
}
@DeleteMapping("/{id}")
public boolean delete(@PathVariable Integer id) {
return bookService.delete(id);
}
@GetMapping("/{id}")
public Book getById(@PathVariable Integer id) {
return bookService.getById(id);
}
@GetMapping
public List getAll() {
return bookService.getAll();
}
} 三、封装返回值
3.1、Code类
public class Code {
public static final Integer SAVE_OK = 20011;
public static final Integer DELETE_OK = 20021;
public static final Integer UPDATE_OK = 20031;
public static final Integer GET_OK = 20041;
public static final Integer SAVE_ERR = 20010;
public static final Integer DELETE_ERR = 20020;
public static final Integer UPDATE_ERR = 20030;
public static final Integer GET_ERR = 20040;
}
3.2、Result类
public class Result {
private Object data;
private Integer code;
private String msg;
public Result() {
}
public Result( Integer code,Object data, String msg) {
this.data = data;
this.code = code;
this.msg = msg;
}
public Result(Integer code,Object data) {
this.data = data;
this.code = code;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
3.3、把控制器返回类型改成Result
@RestController
@RequestMapping("/books")
public class BookController {
@Autowired
private BookService bookService;
@PostMapping
public Result save(@RequestBody Book book) {
boolean flag = bookService.save(book);
return new Result(flag ? Code.SAVE_OK : Code.SAVE_ERR, flag);
}
@PutMapping
public Result update(@RequestBody Book book) {
boolean flag = bookService.update(book);
return new Result(flag ? Code.UPDATE_OK : Code.UPDATE_ERR, flag);
}
@DeleteMapping("/{id}")
public Result delete(@PathVariable Integer id) {
boolean flag = bookService.delete(id);
return new Result(flag ? Code.DELETE_OK : Code.DELETE_ERR, flag);
}
@GetMapping("/{id}")
public Result getById(@PathVariable Integer id) {
Book book = bookService.getById(id);
Integer code = book != null ? Code.GET_OK : Code.GET_ERR;
String msg = book != null ? "" : "数据查询失败，请重试!";
return new Result(code, book, msg);
}
@GetMapping
public Result getAll() {
List books = bookService.getAll();
Integer code = books != null ? Code.GET_OK : Code.GET_ERR;
String msg = books != null ? "" : "数据查询失败，请重试!";
return new Result(code, books, msg);
}
} 四、异常
4.1、异常类
public class BusinessException extends RuntimeException {
private Integer code;
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public BusinessException(Integer code, String message) {
super(message);
this.code = code;
}
public BusinessException(Integer code, String message, Throwable cause) {
super(message, cause);
this.code = code;
}
}
public class SystemException extends RuntimeException {
private Integer code;
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public SystemException(Integer code, String message) {
super(message);
this.code = code;
}
public SystemException( Integer code, String message, Throwable cause) {
super(message, cause);
this.code = code;
}
}4.2、异常AOP
@RestControllerAdvice
public class ProjectExceptionAdvice {
@ExceptionHandler(SystemException.class)
public Result doSystemException(SystemException ex){
// 记录日志
// 发送消息给运维
// 发送邮件给开发人员
return new Result(ex.getCode(), null, ex.getMessage());
}
@ExceptionHandler(BusinessException.class)
public Result doBusinessException(BusinessException ex){
return new Result(ex.getCode(), null, ex.getMessage());
}
// 处理其他异常
@ExceptionHandler(Exception.class)
public Result doException(Exception ex){
// 记录日志
// 发送消息给运维
// 发送邮件给开发人员
return new Result(Code.SYSTEM_UNKNOWN_ERR, null, "系统繁忙请稍后重试!!!");
}
}- @RestControllerAdvice 注解声明为AOP类 后，会自动注入到Spring内
4.3、异常使用
public Book getById(Integer id) {
if( id == 1){
throw new BusinessException(Code.BUSINESS_ERR, "请输入正确的年龄");
}
try {
int i = 1 / 0;
}catch (Exception e){
throw new SystemException(Code.SYSTEM_ERR, "服务器异常", e);
}
return bookDao.getById(id);
}-
根据情况抛出不同异常