SSM整合
步骤
-
创建工程
-
SSM整合
-
Spring
SpringConfig
-
MyBatis
MybatisConfig
JdbcConfig
jdbc.properties
-
SpringMVC
ServletConfig
SpringMvcConfig
3.功能模块
-
表和实体类
-
Dao(接口+自动代理)
-
service(接口+测试类)
业务层接口(整合Junit)
-
Controller
表现层接口测试(PostMan)
-
一:导入相关依赖
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.10.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.10.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.2.10.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.16</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
<configuration>
<port>80</port>
<path>/</path>
</configuration>
</plugin>
</plugins>
</build>
二:创建相应包和类
三:编写相应配置类
3.1:Spring配置类
@Configuration
@Import({JdbcConfig.class,MybatisConfig.class})
@ComponentScan("com.ysj.service")
@PropertySource("classpath:jdbc.properties")
public class SpringConfig {
}
3.2:MyBatis配置类
3.2.1:Mybatis
public class MybatisConfig {
@Bean
public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setTypeAliasesPackage("com.ysj.Domain");
sqlSessionFactoryBean.setDataSource(dataSource);
return sqlSessionFactoryBean;
}
@Bean
public MapperScannerConfigurer mapperScannerConfigurer(){
MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
mapperScannerConfigurer.setBasePackage("com.ysj.Dao");
return mapperScannerConfigurer;
}
}
3.2.2:Jdbc配置类
public class JdbcConfig {
// jdbc.driver=com.mysql.jdbc.Driver
// jdbc.url=jdbc:mysql://localhost:3308/mybatis
// jdbc.username=root
// jdbc.password=yangshijie
@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;
}
}
3.2.3:Jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=root
4:SpringMVC配置类
-
控制表现层(这个配置类如果导入SpringConfig中,SpringMVC控制的bean也会被Spring控制)
@Configuration @ComponentScan("com.ysj.Controller") @EnableWebMvc public class SpringMvcConfig { }
-
web配置类
//web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[]{"/"}; } }
5:Junit测试
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class) //上下文配置类
public class BookServiceTest {
@Autowired
private BookService bookService;
@Test
public void testGetById(){
Book book = bookService.getById(1);
System.out.println(book);
}
@Test
public void testGetAll(){
List<Book> all = bookService.getAll();
System.out.println(all);
}
}
6:事务管理器
6.1:注册驱动
-
在Spring配置类中注册事务管理驱动
@EnableTransactionManagement
6.2:配置平台事务管理容器
- 可在Jdbc配置类中直接配置
@Bean
public PlatformTransactionManager transactionManager(DataSource dataSource){
DataSourceTransactionManager ds = new DataSourceTransactionManager();
ds.setDataSource(dataSource); //别用方法调用,否则就变成了java语言管理,而不是Speing容器管理了
return ds;
}
6.3:加事务
-
直接在service接口类上加@Transactional
-
后续有更多需求再加(事务传播行为等)
@Transactional
7:前后端传输协议
7.1:后端返回值
public class Result {
//描述统一格式中的数据
private Object data;
//描述统一格式中的编码,用于区分操作,可以简化配置0或1表示成功失败
private Integer code;
//描述统一格式中的消息,可选属性
private String msg;
public Result() {
}
public Result(Integer code,Object data) {
this.data = data;
this.code = code;
}
public Result(Integer code, Object data, String msg) {
this.data = data;
this.code = code;
this.msg = msg;
}
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;
}
}
-
编写Code编码类(状态码)
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; public static final Integer SYSTEM_ERR = 50001; public static final Integer SYSTEM_TIMEOUT_ERR = 50002; public static final Integer SYSTEM_UNKNOW_ERR = 59999; public static final Integer BUSINESS_ERR = 60002; }
8:自定义异常处理器
- 新建一个excepition包
- 包下创建所需各个异常类
8.1:总的异常处理器
//@RestControllerAdvice用于标识当前类为REST风格对应的异常处理器
@RestControllerAdvice
public class ProjectExceptionAdvice {
//@ExceptionHandler用于设置当前处理器类对应的异常类型
@ExceptionHandler(SystemException.class)
public Result TestExcepition(TestExcepition ex){
//记录日志
//发送消息给运维
//发送邮件给开发人员,ex对象发送给开发人员
return new Result(ex.getCode(),null,ex.getMessage());
}
//除了自定义的异常处理器,保留对Exception类型的异常处理,用于处理非预期的异常
@ExceptionHandler(Exception.class)
public Result doOtherException(Exception ex){
//记录日志
//发送消息给运维
//发送邮件给开发人员,ex对象发送给开发人员
return new Result(Code.SYSTEM_UNKNOW_ERR,null,"系统繁忙,请稍后再试!");
}
}
8.2:自定义分类的异常处理器类
- 记得继承相应的异常父类,
- 原因:程序运行时遇到相应异常后可以不处理向上抛
- 不继承坏处:以后每个方法都要加上这个类
//继承RuntimeException类
public class TestExcepition extends RuntimeException {
private Integer code; //区别自定义异常类的编码
public TestExcepition(Integer code) {
this.code = code;
}
public TestExcepition(String message, Integer code) {
super(message);
this.code = code;
}
public TestExcepition(String message, Throwable cause, Integer code) {
super(message, cause);
this.code = code;
}
public void setCode(Integer code) {
this.code = code;
}
public Integer getCode() {
return code;
}
}
9:拦截器
9.1:拦截器概念
- 拦截器是是一种动态拦截方法调用的机制,在SpringMVC中动态拦截控制器方法的执行(执行的时候类似栈思想)
- 作用
- 在指定的方法执行前后调用我们预先设定的代码
- 阻止原始方法的执行(权限)
9.2:拦截器和过滤器的区别
9.2.1 精简版
- 过滤器是Servlet技术,其可以对几乎所有的请求进行增强
- 拦截器是SpringMVC技术,仅仅对SpringMVC技术进行增强
9.2.2 详细版
以下信息来源于html中文网
9.3:拦截器入门
-
拦截器在表现层生效,所以建议在controller包下新建Interceptor包
-
在该包下新建所需拦截器类(类继承
HandlerInterceptor
接口)
//继承HandlerInterceptor接口
//注意当前类必须受Spring容器控制
@Component
public class TestProjectInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//中间可以加上所需业务逻辑
return false;//这个返回值决定了后续的原生方法等是否会执行
}
//原始方法调用后执行的内容
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
//原始方法调用完成后执行的内容
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
-
将其加入SpringMvc控制中
-
方法:
-
新建一个类,继承
WebMvcConfigurationSupport
类@Configuration public class SpringMvcSupport extends WebMvcConfigurationSupport { @Autowired private TestProjectInterceptor testProjectInterceptor; // * 匹配单个字符,如 /user/* 匹配的是 /user/aa,/user/bb 等,又如 /user/*/ab 匹配到 /user/p/ab; // ** 匹配任意多字符(包括多级路径),如:/user/** 匹配到 /user/aa、/user/p/bb 等; //配置相应的静态资源放行 @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("pages/**").addResourceLocations("pages/"); } @Override protected void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(testProjectInterceptor).addPathPatterns("books/","books/*"); } }
-
直接在SpringMvc配置类中进行
- 让SpringMvc配置类继承
WebMvcConfigurer
接口
- 让SpringMvc配置类继承
@Configuration @ComponentScan({"com.ysj.controller"}) @EnableWebMvc //实现WebMvcConfigurer接口可以简化开发,但具有一定的侵入性 public class SpringMvcConfig implements WebMvcConfigurer { @Autowired private ProjectInterceptor projectInterceptor; @Autowired private ProjectInterceptor2 projectInterceptor2; @Override public void addInterceptors(InterceptorRegistry registry) { //配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books","/books/*"); registry.addInterceptor(projectInterceptor2).addPathPatterns("/books","/books/*"); } }
-
9.4????拦截器参数
-
request:请求对象
-
response:响应对象
-
handler:一个被调用的处理器对象,其本质上是一个方法对象(HandlerMethod),对反射技术中的
Method进行的再包装。
-
ModelAndView:若处理器执行完成具有返回结果,可以读取到对应数据与页面信息,并进行调整
-
Exception:获取程序运行过程中的异常对象(可通过SpringMvc自定义的异常处理器完美代替)
9.5????拦截器链
-
创建所需的多个拦截器类
-
配置多拦截器
@Override public void addInterceptors(InterceptorRegistry registry) { //配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books","/books/*"); registry.addInterceptor(projectInterceptor2).addPathPatterns("/books","/books/*"); } }
-
多拦截器执行顺序
- 按添加顺序运行
- 若其中一个拦截器触发拦截条件,返回值为false,则直接跳到afterCompletion方法处,然后(出栈思想)
的异常处理器完美代替)
9.5????拦截器链
-
创建所需的多个拦截器类
-
配置多拦截器
@Override public void addInterceptors(InterceptorRegistry registry) { //配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books","/books/*"); registry.addInterceptor(projectInterceptor2).addPathPatterns("/books","/books/*"); } }
-
多拦截器执行顺序
- 按添加顺序运行
- 若其中一个拦截器触发拦截条件,返回值为false,则直接跳到afterCompletion方法处,然后(出栈思想)
** 好了。SSM整合包含的知识点和步骤到这里已经总结完了,如有不足请指正,欢迎各位来一起交流讨论。
最后,创作不易,给个三连支持下呗。**