基于注解的SpringMVC大致开发流程

基于注解的SpringMVC大致开发流程

首先我们需要明确,基于注解的开发,Maven项目对于web.xml文件不是必要的,所以,我们需要再pom.xml中进行配置:

1      <properties>
2          <failOnMissingWebXml>false</failOnMissingWebXml>
3          <maven.compiler.source>1.8</maven.compiler.source>
4          <maven.compiler.target>1.8</maven.compiler.target>
5      </properties>

 

基于注解的开发是比较简易的,首先是mvc开发过程中需要初始加载的内容写在spring初始化的类中:

 public class SpringMvcInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
 ​
     @Override
     protected Class<?>[] getRootConfigClasses() {
         return null;
     }
 ​
     @Override
     protected Class<?>[] getServletConfigClasses() {
         return new Class[] { SpringMvcConfigurer.class };
     }
 ​
     @Override
     protected String[] getServletMappings() {
         return new String[] { "*.do"};
     }
 ​
     @Override
     protected Filter[] getServletFilters() {
         // CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
         // characterEncodingFilter.setEncoding("utf-8");
         return new Filter[] { new CharacterEncodingFilter("utf-8") };
     }
 ​
 }

 

其中:

  • getRootConfigClasses():获取Spring的配置类,在简单的SpringMVC项目中,也许并不需要编写任何Spring环境的配置,则该方法返回null即可,后续,如果整合MyBatis框架或其它框架时,可能需要编写相关配置;

  • getServletConfigClasses():获取SpringMVC的配置类,SpringMVC的配置类可以自定义,且必须实现WebMvcConfigurer接口;

  • getServletMappings():获取框架所处理的请求的路径,假设所有以.do为后缀的请求都需要被SpringMVC框架处理,则可以配置为*.do

 

其次,我们需要做就是MVC的配置类的开发:

 1  @ComponentScan("cn.tedu.spring")
 2  @Configuration
 3  @EnableWebMvc
 4  public class SpringMvcConfigurer implements WebMvcConfigurer {
 5      private String characterEncoding = "utf-8";
 6  7      /**
 8       * 添加拦截器链
 9       */
10      public void addInterceptors(InterceptorRegistry registry) {
11          // 注意:配置拦截器作用的相关路径时,路径值必须使用 / 作为第1个字符
12          LoginInterceptor interceptor = new LoginInterceptor();
13              registry.addInterceptor(interceptor)
14                      .addPathPatterns("/hello.do")
15                      .excludePathPatterns();
16      }
17 18      @Bean
19      public ViewResolver configViewResolver() {
20      // ------------------------------------------------
21      // 通常使用的模版解析器有ClassLoaderTemplateResolver和ServletContextTemplateResolver,在实际使用时,任选其一即可!
22      // 当使用ClassLoaderTemplateResolver时,会自动到项目的src/main/resources下查找视图文件
23      // 当使用ServletContextTemplateResolver时,会自动到项目的webapp下查找视图文件
24      // ------------------------------------------------
25  27       //以下代码中,前缀的配置值是/templates/,后缀的配置值是.html,当方法返回的字符串 demo 时,将拼接得到 /templates/demo.html,则会以这个文件作为视图文件
28          ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
29          templateResolver.setCharacterEncoding(characterEncoding);
30          templateResolver.setTemplateMode("HTML");
31          templateResolver.setCacheable(false);
       //setPrefix()方法表示配置前缀
32 templateResolver.setPrefix("/templates/");
       //setSuffix()表示配置后缀  
33 templateResolver.setSuffix(".html"); 34 ​     35 SpringTemplateEngine templateEngine = new SpringTemplateEngine(); 36 templateEngine.setTemplateResolver(templateResolver); 37 38 ThymeleafViewResolver viewResolver = new ThymeleafViewResolver(); 39 viewResolver.setCharacterEncoding(characterEncoding); 40 viewResolver.setTemplateEngine(templateEngine); 41 return viewResolver; 42 } 43 }

 

 

下面就需要我们来配置spring整合数据库的java类了:

 1 @PropertySource("jdbc.properties")
 2  @Configuration
 3  @MapperScan("cn.tedu.yonghe.mapper")
 4  public class SpringConfigurer {
 5  6      @Value("${mysql.url}")
 7      private String url;
 8      @Value("${mysql.driver}")
 9      private String driver;
10      @Value("${mysql.username}")
11      private String username;
12      @Value("${mysql.password}")
13      private String password;
14      @Value("${mysql.initialSize}")
15      private Integer initialSize;
16      @Value("${mysql.maxTotal}")
17      private Integer maxTotal;
18      @Value("${mybatis.mapper-locations}")
19      private Resource[] mapperLocations;
20      
21      @Bean
22      public DataSource dataSource() {
23          BasicDataSource dataSource = new BasicDataSource();
24          dataSource.setUrl(url);
25          dataSource.setDriverClassName(driver);
26          dataSource.setUsername(username);
27          dataSource.setPassword(password);
28          dataSource.setInitialSize(initialSize);
29          dataSource.setMaxTotal(maxTotal);
30          return dataSource;
31      }
32      
33      @Bean
34      public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource) {
35          SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
36          bean.setDataSource(dataSource);
37          bean.setMapperLocations(mapperLocations);
38          return bean;
39      }
40  }

 

其中,jdbc.properties文件内容:

1  mysql.url=jdbc:mysql://localhost:3306/tedu_ums?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
2  mysql.driver=com.mysql.cj.jdbc.Driver
3  mysql.username=root
4  mysql.password=root
5  mysql.initialSize=2
6  mysql.maxTotal=10
7 8  mybatis.mapper-locations=classpath:mappers/*.xml

 

附注:SpringMVC开发过程中需要的jar包依赖

 <!-- SpringMVC -->
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-webmvc</artifactId>
     <version>5.2.2.RELEASE</version>
 </dependency>
 <!-- Spring JDBC依赖,必须与其它Spring依赖使用完全相同的版本 -->
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-jdbc</artifactId>
     <version>5.2.2.RELEASE</version>
 </dependency>
 <!-- Mybatis框架 -->
 <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis</artifactId>
     <version>3.5.0</version>
 </dependency>
 <!-- MyBatis整合Spring -->
 <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis-spring</artifactId>
     <version>2.0.1</version>
 </dependency>
 <!-- Thymeleaf -->
 <dependency>
     <groupId>org.thymeleaf</groupId>
     <artifactId>thymeleaf</artifactId>
     <version>3.0.11.RELEASE</version>
 </dependency>
 <!-- Thymeleaf整合Spring -->
 <dependency>
     <groupId>org.thymeleaf</groupId>
     <artifactId>thymeleaf-spring5</artifactId>
     <version>3.0.11.RELEASE</version>
 </dependency>
 <!-- 连接MySQL数据库的依赖 -->
 <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>8.0.15</version>
 </dependency>
 <!-- 数据库连接池 -->
 <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
     <version>1.1.21</version>
 </dependency>
 <!-- 单元测试 -->
 <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
     <version>4.13</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>org.slf4j</groupId>
     <artifactId>slf4j-log4j12</artifactId>
     <version>1.7.25</version>
 </dependency>

 

 

 

 

setPrefix()方法表示配置“前缀”

posted on 2020-11-11 08:59  零度的脚步  阅读(170)  评论(0编辑  收藏  举报

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