基于注解配置的SpringMVC项目 - 标准项目初始化流程 (包含基本拦截器, 视图解析器,静态资源处理器)

做项目,尤其是基于不同业务而创建的项目,很少有标准的项目初始化流程. 但在技术层面,使用一个标准且可复用的方式去创建包含基本功能的工程,是程序员的基本素养. 而且, 更主要的是,依靠这样的方式,可以节省大量的时间和精力.

废话不多说, 开始一个基本的SpringMVC项目.

开始之前, 确定已经将项目链接到github, 并做了最基本的maven update或其他的排错操作.

首先, 添加依赖 - eclipse创建基本的Maven项目, 编辑pom.xml (注意, 其中db2的依赖需要额外花时间解决一下, 具体方法参见我另外的文档)

<dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    
    <dependency>
        <groupId>db2jcc</groupId>
        <artifactId>db2jcc4</artifactId>
        <version>10.1</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.16</version>
    </dependency>
        <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

创建基本过滤器. 新建APPInit 类, 加入如下内容:

public class AppInit extends AbstractAnnotationConfigDispatcherServletInitializer{

    @Override
    protected Class<?>[] getRootConfigClasses() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        // TODO Auto-generated method stub
        return new Class[] {WebConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        // TODO Auto-generated method stub
        return new String[] {"/"};
    }

}

编辑 WebConfig 类

@Configuration
@ComponentScan("com.yzcao.controller")
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer{
    
    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        
        return resolver;
    }
    
    @Bean(name = "dataSource")
    public DruidDataSource getDataSource() {
        try {
 
            DruidDataSource dataSource = new DruidDataSource();
            dataSource.setDriverClassName("com.ibm.db2.jcc.DB2Driver");
            dataSource.setUrl("XXX");
            dataSource.setUsername("XXX");
            dataSource.setPassword("XXX"); 
        return dataSource;
        } catch (Exception e) {
          return null;
        }
    }
    
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry
          .addResourceHandler("/resource/**")
          .addResourceLocations("/resource/"); 
    }
}

创建基本 controller

@Controller
public class IndexController {

    private DataSource dataSource;
     
      private JdbcTemplate jdbcTemplateObject;
     
      @Autowired
      public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
        this.jdbcTemplateObject = new JdbcTemplate(dataSource);
      }
    
    @RequestMapping(value="/", method=RequestMethod.GET)
    public ModelAndView indexController() {
        
        ModelAndView mav = new ModelAndView("index");
//        String SQL = "INSERT INTO MESADMIN.CICTAGS (NAME, \"VALUES\") VALUES ('CAMS', '')";
//        jdbcTemplateObject.execute(SQL);
        List<Map<String, Object>> tagList = new ArrayList<>();
        String getTags = "select NAME from MESADMIN.CICTAGS";
        tagList = jdbcTemplateObject.queryForList(getTags);
        
        List<String> newList = new ArrayList<>();
        for (int i = 0; i < tagList.size(); i++) {
            System.out.println(tagList.get(i).get("NAME"));
            newList.add((String) tagList.get(i).get("NAME"));
        }
        
        
        
        mav.addObject("tags", tagList);
        
        return mav;
    }
}
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