SSM框架整合基于JavaConfig配置方式也就是通过注解方式不用XML配置

电玩女神 2022-05-14 01:37 198阅读 0赞

SSM(Srping、SrpingMVC、Mybatis)现JAVA最主流三大框架，本文是通过全注解方式配置的，无XML。经常会看到各种繁多的XML配置非常的烦人，在Spring3之后，Spring支持使用JavaConfig来代替XML配置。废话不多说了，直接上代码。

#### 创建JAVA Web项目 ####

我这里使用的是IDEA开发工具，编辑器没关系，个人喜欢。项目构建通过Maven不需要导入Jar包，直接添加依赖即可。

完整目录结构如下  
![这里写图片描述][70]

#### 依赖包pom.xml ####

> 主要依赖Spring、mybatis、log4j等。

<?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>com.wip</groupId>
      <artifactId>myblog</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>war</packaging>
    
      <name>myblog Maven Webapp</name>
      
      <url>http://maven.apache.org</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    
        <spring.version>4.3.7.RELEASE</spring.version>
    
      </properties>
    
      <dependencies>
        
        
          
          
          
          
        
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-core</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-beans</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-tx</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context-support</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-aop</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
          <version>1.2.17</version>
        </dependency>
    
    
        <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.40</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.4.2</version>
        </dependency>
    
    
        <dependency>
          <groupId>commons-dbcp</groupId>
          <artifactId>commons-dbcp</artifactId>
          <version>1.2.1</version>
        </dependency>
    
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>1.3.1</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>commons-collections</groupId>
          <artifactId>commons-collections</artifactId>
          <version>3.2.2</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-oxm</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-tx</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>javax</groupId>
          <artifactId>javaee-api</artifactId>
          <version>7.0</version>
          
          <scope>provided</scope>
        </dependency>
    
        <dependency>
          <groupId>org.tautua.markdownpapers</groupId>
          <artifactId>markdownpapers-core</artifactId>
          <version>1.4.1</version>
        </dependency>
    
    
    
      </dependencies>
    
      <build>
        <finalName>myblog</finalName>
        <pluginManagement>
          <plugins>
            <plugin>
              <artifactId>maven-clean-plugin</artifactId>
              <version>3.0.0</version>
            </plugin>
            
            <plugin>
              <artifactId>maven-resources-plugin</artifactId>
              <version>3.0.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-compiler-plugin</artifactId>
              <version>3.7.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-surefire-plugin</artifactId>
              <version>2.20.1</version>
            </plugin>
            <plugin>
              <artifactId>maven-war-plugin</artifactId>
              <version>3.2.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-install-plugin</artifactId>
              <version>2.5.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-deploy-plugin</artifactId>
              <version>2.8.2</version>
            </plugin>
          </plugins>
        </pluginManagement>
      </build>
    </project>

#### 配置文件 ####

*    
    
 *  Webinitializer

> Webinitializer实现`WebApplicationInitializer`这个类的Onstartup方法，可以看做是Web.xml的替代，它是一个接口，在其中可以添加Servlet，Listener等，在加载Web项目的时候会加载这个接口实现类，从而起到Web.xml相同的作用。

import org.springframework.web.WebApplicationInitializer;
    import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
    import org.springframework.web.filter.CharacterEncodingFilter;
    import org.springframework.web.servlet.DispatcherServlet;
    
    import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRegistration;
    
    public class WebInitializer implements WebApplicationInitializer { 
        @Override
        public void onStartup(ServletContext servletContext) throws ServletException {
            AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
            ctx.register(MyMVCConfig.class);
            servletContext.addFilter("encodingFilter", new CharacterEncodingFilter("UTF-8",true));
            ctx.setServletContext(servletContext);
            ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher",new DispatcherServlet(ctx));
            servlet.addMapping("/");
            servlet.setLoadOnStartup(1);
        }
    }

*    
    
 *  MyMVCConfig

> MyMVCConfig继承自`WebMvcConfigurerAdapter`它是一个抽象类，配置类的作用就是Spring内部的一种配置方式，替代Spring、SpringMVC.xml配置的。

import org.apache.commons.dbcp.BasicDataSource;
    import org.mybatis.spring.SqlSessionFactoryBean;
    import org.mybatis.spring.mapper.MapperScannerConfigurer;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    import org.springframework.web.servlet.view.InternalResourceViewResolver;
    import org.springframework.web.servlet.view.JstlView;
    
    import java.io.IOException;
    
    @Configuration
    @EnableWebMvc
    @ComponentScan("com.wip")
    public class MyMVCConfig extends WebMvcConfigurerAdapter { 
    
    
        /** * 配置页面路径和.jsp文件 * @return */
        @Bean
        public InternalResourceViewResolver viewResolver() {
            InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
            viewResolver.setPrefix("/WEB-INF/");
            viewResolver.setSuffix(".jsp");
            viewResolver.setViewClass(JstlView.class);
            return viewResolver;
        }
    
        /** * 静态资源配置 * @param registry */
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
            registry.addResourceHandler("/static/**").addResourceLocations("/WEB-INF/static/");
        }
    
        /** * 数据资源配置 * @return */
        @Bean
        public BasicDataSource dataSource() {
            BasicDataSource dataSource = new BasicDataSource();
            dataSource.setDriverClassName("com.mysql.jdbc.Driver");
            dataSource.setUrl("jdbc:mysql://localhost:3306/blog?useUnicode=true&characterEncoding=UTF-8");
            dataSource.setUsername("root");
            dataSource.setPassword("root");
            return dataSource;
        }
    
        /** * mybatis配置 * @return */
        @Bean
        public SqlSessionFactoryBean sqlSessionFactoryBean() {
            PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
            SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
            sqlSessionFactoryBean.setDataSource(dataSource());
            try {
                sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:mapping/*.xml"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            return sqlSessionFactoryBean;
        }
    
        /** * mybatis配置 * @return */
        @Bean
        public MapperScannerConfigurer mapperScannerConfigurer() {
            MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
            mapperScannerConfigurer.setBasePackage("com.wip.dao");
            mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
            return mapperScannerConfigurer;
        }
    
    
        /** * 添加拦截登录拦截器 * @param registry */
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(loginInterceptors());
        }
    
        /** * 拦截器注入到Bean * @return */
        @Bean
        public LoginInterceptors loginInterceptors() {
            return new LoginInterceptors();
        }
    
    }

###### viewResolver ######

> 这个对我们来说很熟悉，只要我们配置html、Jsp页面视图时就会用到InternalResourceViewResolver配置类，然后设置preffix、suffix参数进行配置视图文件路径前缀与后缀。

###### sqlSessionFactoryBean、dataSource ######

> 这里主要配置数据源，Spring的事务管理和Dao接口的扫描，以及MyBatis的一些配置文件的扫描。

###### addInterceptors ######

> 在之前Xml配置形式天下的时候，我们都是在spring-mvc.xml配置文件内添加`<mvc:interceptor>`标签配置拦截器。我这里添加了一个登录拦截器。LoginInterceptors登录拦截器

import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * 登录拦截器 */
    public class LoginInterceptors implements HandlerInterceptor { 
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            request.setCharacterEncoding("UTF-8");
            StringBuffer requestURL = request.getRequestURL();
            if (requestURL.toString().contains("admin") &&
                    !requestURL.toString().contains("admin/login") &&
                    !requestURL.toString().contains("admin/dologin")) {
                Object user = request.getSession().getAttribute("user");
                if (null == user) {
                    response.sendRedirect("/admin/login");
                    return false;
                } else {
                    return true;
                }
            } else {
                return true;
            }
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    
        }
    }

##### log4j.properties主要是日志文件 #####

log4j.rootLogger=DEBUG,stdout
    log4j.logger.org.mybatis=DEBUG
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%5p %d %C: %m%n

##### jdbc.properties主要是数据源配置 #####

db.driverClass=com.mysql.jdbc.Driver
    db.url=jdbc:mysql//localhost:3306/blog
    db.username=root
    db.password=root
    db.initialSize=0
    db.maxActive=500
    db.maxIdle=20
    db.minIdle=1
    db.maxWait=60000

到这里我们的框架基本就成形了

#### 下面进行测试 ####

文章结尾提供源码下载地址 在数据库里新建表(数据库是用的mysql)

DROP TABLE IF EXISTS `user`;
    CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, `password` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
    
    SET FOREIGN_KEY_CHECKS = 1;

*  实体类User

public class User {
        private long id;
        private String username;
        private String password;
    
        public long getId() {
            return id;
        }
    
        public void setId(long id) {
            this.id = id;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    }

*  Mapper文件Usermapper.xml

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.wip.dao.UserDao">
        
        <select id="getUser" resultType="com.wip.model.User" parameterType="string">
            SELECT * FROM user WHERE username=#{username} AND password=#{password}
        </select>
    </mapper>

*  UserDao接口

import com.wip.model.User;
    import org.apache.ibatis.annotations.Param;
    
    public interface UserDao { 
        /** * 通过用户名和密码查找用户 * @param username * @param password * @return */
        User getUser(@Param("username") String username,@Param("password") String password);
    }

*  UserService服务层

import com.wip.dao.UserDao;
    import com.wip.model.User;
    import org.springframework.stereotype.Service;
    import javax.annotation.Resource;
    @Service
    public class UserService { 
        @Resource
        private UserDao userDao;
    
        public boolean login(String username, String password) {
            User user = userDao.getUser(username,password);
            if (user == null) {
                return false;
            }else {
                return true;
            }
        }
    }

*  Controller

@RequestMapping(value = "/admin/dologin", method = RequestMethod.POST)
       public String doLogin(HttpServletRequest request, User user, Model model) {
           System.out.println("user.getUsername():" + user.getUsername() + ";user.getPassword()" + user.getPassword());
           if (userService.login(user.getUsername(),user.getPassword())) {
               request.getSession().setAttribute("user",user);
               model.addAttribute("user",user);
               return "redirect:/admin";
           } else {
               model.addAttribute("error","用户名或密码错误");
               return "admin/login";
           }
       }

*  WEB-INF/admin下的login.jsp

<%-- Created by IntelliJ IDEA. User: Kyrie Date: 2018/7/20 Time: 9:09 To change this template use File | Settings | File Templates. --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <% String contextPath = request.getContextPath(); %>
    <html>
    <head>
        <title>登录</title>
        <script src="<%=contextPath%>/static/jquery-3.1.1.js"></script>
        <script src="<%=contextPath%>/static/bootstrap/js/bootstrap.js"></script>
        <link href="<%=contextPath%>/static/bootstrap/css/bootstrap.css" rel="stylesheet"/>
        <link href="<%=contextPath%>/static/bootstrap/css/bootstrap-theme.css" rel="stylesheet"/>
        <link href="<%=contextPath%>/static/signin.css" rel="stylesheet"/>
    </head>
    <body>
    <div class="container">
    
        <form class="form-signin" action="/admin/dologin" method="post">
            <h2 class="form-signin-heading">请登录</h2>
            <div style="height: 25px; color: red;">
                <%if (request.getAttribute("error") != null) {%>
                    <%=request.getAttribute("error")%>
                <%}%>
            </div>
            <label for="inputEmail" class="sr-only">请输入用户名</label>
            <input type="text" id="inputEmail" name="username" value="Kyrie" class="form-control" placeholder="用户名" required autofocus>
            <label for="inputPassword" class="sr-only">密码</label>
            <input type="password" id="inputPassword" name="password" value="123456" class="form-control" placeholder="密码" required>
            <div class="checkbox">
                <label>
                    <input type="checkbox" value="remember-me"> 记住我
                </label>
            </div>
            <button class="btn btn-lg btn-primary btn-block" type="submit">登录</button>
        </form>
    
    </div>
    </body>
    </html>

*  运行项目，访问`localhost:8080/admin`  
    ![这里写图片描述][70 1]  
    登录成功  
    ![这里写图片描述][70 2]

项目源码：[GitHub][]

不足的地方，请留言会及时改正。觉得可以的话帮忙`Start`。

[70]: /images/20220514/2ca2323e3464440aa7a6bcd03e7bf533.png
[70 1]: /images/20220514/11a7877c74f3404ebd5a5edb2fa3810a.png
[70 2]: /images/20220514/92bc675dc9ac40659cd65b4c25de5d15.png
[GitHub]: https://github.com/caozongpeng/SSMBlogTest