spring+hibernate+struts2零配置整合

　　说句实话，很久都没使用SSH开发项目了，但是出于各种原因，再次记录一下整合方式，纯注解零配置。

一。前期准备工作

gradle配置文件：

group 'com.bdqn.lyrk.ssh.study'
version '1.0-SNAPSHOT'

apply plugin: 'war'

repositories {
    mavenLocal()
    mavenCentral()
}

dependencies {
    // https://mvnrepository.com/artifact/org.apache.struts/struts2-core
    compile group: 'org.apache.struts', name: 'struts2-core', version: '2.5.14.1'

// https://mvnrepository.com/artifact/org.apache.struts/struts2-spring-plugin
    compile group: 'org.apache.struts', name: 'struts2-spring-plugin', version: '2.5.14.1'
// https://mvnrepository.com/artifact/org.springframework/spring-context
    compile group: 'org.springframework', name: 'spring-context', version: '5.0.4.RELEASE'
// https://mvnrepository.com/artifact/org.springframework/spring-web
    compile group: 'org.springframework', name: 'spring-web', version: '5.0.4.RELEASE'

// https://mvnrepository.com/artifact/org.hibernate/hibernate-core
    compile group: 'org.hibernate', name: 'hibernate-core', version: '5.2.12.Final'
// https://mvnrepository.com/artifact/org.hibernate/hibernate-validator
    compile group: 'org.hibernate', name: 'hibernate-validator', version: '5.4.1.Final'

// https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api
    compile group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'
// https://mvnrepository.com/artifact/org.springframework/spring-orm
    compile group: 'org.springframework', name: 'spring-orm', version: '5.0.4.RELEASE'
    // https://mvnrepository.com/artifact/org.springframework/spring-tx
    compile group: 'org.springframework', name: 'spring-tx', version: '5.0.4.RELEASE'

// https://mvnrepository.com/artifact/com.zaxxer/HikariCP
    compile group: 'com.zaxxer', name: 'HikariCP', version: '2.7.4'
// https://mvnrepository.com/artifact/org.apache.struts/struts2-convention-plugin
    compile group: 'org.apache.struts', name: 'struts2-convention-plugin', version: '2.5.14.1'

    testCompile group: 'junit', name: 'junit', version: '4.11'
}

结构文件：

注意在classpath下创建META-INF/services/javax.serlvet.ServletContainerInitializer文件，那么在文件中定义的类在servlet容器启动时会执行onStartup方法，我们可以在这里编码创建servlet,fliter,listener等，文件内容如下：

com.bdqn.lyrk.ssh.study.config.WebInitializer

二。具体的集成实现方案

1.定义 MyAnnotationConfigWebApplicationContext

package com.bdqn.lyrk.ssh.study.config;

import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;

/**
 * 自定义配置，为了在ContextLoaderListener初始化注解配置时使用
 * @Author chen.nie
 */
public class MyAnnotationConfigWebApplicationContext extends AnnotationConfigWebApplicationContext {

    public MyAnnotationConfigWebApplicationContext(){
        this.register(AppConfig.class);
    }
}

2.定义WebInitializer

package com.bdqn.lyrk.ssh.study.config;

import org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter;
import org.springframework.orm.hibernate5.support.OpenSessionInViewFilter;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;

import javax.servlet.*;
import javax.servlet.annotation.HandlesTypes;
import javax.servlet.http.HttpServlet;
import java.util.EnumSet;
import java.util.Set;

/**
 * 自定义servlet容器初始化，请参考servlet规范
 */
@HandlesTypes({HttpServlet.class, Filter.class})
public class WebInitializer implements ServletContainerInitializer {
    @Override
    public void onStartup(Set<Class<?>> c, ServletContext ctx) throws ServletException {
        /*
            创建struts2的核心控制器
         */
        StrutsPrepareAndExecuteFilter strutsPrepareAndExecuteFilter = ctx.createFilter(StrutsPrepareAndExecuteFilter.class);
        OpenSessionInViewFilter openSessionInViewFilter = ctx.createFilter(OpenSessionInViewFilter.class);
        /*
            向servlet容器中添加filter
         */
        ctx.addFilter("strutsPrepareAndExecuteFilter", strutsPrepareAndExecuteFilter).
                addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), true, "/*");
        FilterRegistration.Dynamic dynamic = ctx.addFilter("openSessionInViewFilter", openSessionInViewFilter);
        dynamic.setInitParameter("flushMode", "COMMIT");
        dynamic.setInitParameter("sessionFactoryBeanName","localSessionFactoryBean");
        dynamic.setInitParameter("singleSession","true");
        dynamic.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), true, "/*");
        /*
            添加监听器
         */
        ContextLoaderListener contextLoaderListener = new ContextLoaderListener();
        ctx.addListener(contextLoaderListener);
        ctx.setInitParameter("contextClass", "com.bdqn.lyrk.ssh.study.config.MyAnnotationConfigWebApplicationContext");

    }
}

3.定义AppConfig

package com.bdqn.lyrk.ssh.study.config;

import com.zaxxer.hikari.HikariDataSource;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.orm.hibernate5.HibernateTemplate;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.sql.DataSource;
import java.util.Properties;

/**
 * spring基于注解配置
 *
 * @author chen.nie
 * @date 2018/3/21
 **/
@Configuration
@ComponentScan("com.bdqn")
@EnableTransactionManagement
public class AppConfig {

    /**
     * 定义数据源
     * @return
     */
    @Bean
    public HikariDataSource dataSource() {
        HikariDataSource hikariDataSource = new HikariDataSource();
        hikariDataSource.setDriverClassName("com.mysql.jdbc.Driver");
        hikariDataSource.setJdbcUrl("jdbc:mysql://localhost:3306/MySchool?characterEncoding=utf-8&useSSL=false");
        hikariDataSource.setUsername("root");
        hikariDataSource.setPassword("root");
        return hikariDataSource;
    }

    /**
     * 定义spring创建hibernate的Session对象工厂
     * @param dataSource
     * @return
     */
    @Bean
    public LocalSessionFactoryBean localSessionFactoryBean(@Autowired DataSource dataSource) {
        LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
        localSessionFactoryBean.setDataSource(dataSource);
        localSessionFactoryBean.setPackagesToScan("com.bdqn.lyrk.ssh.study.entity");
        Properties properties = new Properties();
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
        properties.setProperty("hibernate.show_sql", "true");
        localSessionFactoryBean.setHibernateProperties(properties);
        return localSessionFactoryBean;
    }

    /**
     * 定义hibernate事务管理器
     * @param localSessionFactoryBean
     * @return
     */
    @Bean
    public HibernateTransactionManager transactionManager(@Autowired SessionFactory localSessionFactoryBean) {
        HibernateTransactionManager hibernateTransactionManager = new HibernateTransactionManager(localSessionFactoryBean);
        return hibernateTransactionManager;
    }

    /**
     * 定义hibernateTemplate
     * @param localSessionFactoryBean
     * @return
     */
    @Bean
    public HibernateTemplate hibernateTemplate(@Autowired SessionFactory localSessionFactoryBean) {
        HibernateTemplate hibernateTemplate = new HibernateTemplate(localSessionFactoryBean);
        return hibernateTemplate;
    }
}

4.定义实体类

package com.bdqn.lyrk.ssh.study.entity;

import javax.persistence.*;

@Table(name = "student")
@Entity
public class StudentEntity {

    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    private Integer id;

    @Column(name = "stuName")
    private String stuName;

    @Column(name = "password")
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getStuName() {
        return stuName;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

5.定义service

package com.bdqn.lyrk.ssh.study.service;

import com.bdqn.lyrk.ssh.study.entity.StudentEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate5.HibernateTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class StudentService {

    @Autowired
    private HibernateTemplate hibernateTemplate;

    @Transactional
    public int save(StudentEntity studentEntity){
         hibernateTemplate.save(studentEntity);
         return studentEntity.getId();
    }
}

6.定义action 请大家留意关于struts2注解的注意事项

package com.bdqn.lyrk.ssh.study.action;

import com.bdqn.lyrk.ssh.study.entity.StudentEntity;
import com.bdqn.lyrk.ssh.study.service.StudentService;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;

/**
 * struts2注解配置，注意：
 * 1.所在的包名必须以action结尾
 * 2.Action要必须继承ActionSupport父类；
 * 3.添加struts2-convention-plugin-xxx.jar
 *
 * @author chen.nie
 * @date 2018/3/21
 **/
@Scope("prototype")
@ParentPackage("struts-default")  //表示继承的父包
@Namespace(value = "/") //命名空间
public class IndexAction extends ActionSupport {

    @Autowired
    private StudentService studentService;

    @Action(value = "index", results = {@Result(name = "success", location = "/index.jsp")})
    public String index() {
        StudentEntity studentEntity = new StudentEntity();
        studentEntity.setStuName("test");
        studentEntity.setPassword("123");
        studentService.save(studentEntity);
        ActionContext.getContext().getContextMap().put("student", studentEntity);
        return com.opensymphony.xwork2.Action.SUCCESS;
    }
}

7.index.jsp

<%--
  Created by IntelliJ IDEA.
  User: chen.nie
  Date: 2018/3/21
  Time: 下午6:55
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>ssh基于零配置文件整合</title>
</head>
<body>
新增的学生id为:${student.id}
</body>
</html>

启动tomcat，访问http://localhost:8080/index得到如下界面：

总结：前面我写过ssm基于注解零配置整合，那么ssh其思路也大体相同，主要是@Configuration @Bean等注解的使用，但是大家请留意的是struts2的注解与servlet的规范(脱离web.xml，手动添加servlet filter listener等)