SSJ框架学习文档

作者: 磨陀货_ | 来源:发表于2019-08-29 17:00 被阅读0次

SSJ框架学习文档
ssj框架集成包
ssj
0.开篇的话-symfony3.4
框架
[源码探究]ARouter 源码学习
ios学习笔记之FMDB的基本使用
gRPC 基本概念
什么是gRPC
2017.9.29

SpringMVC/Struts/Struts2 + Spring + JPA

第一步新建web项目

image.png

pom.xml中JDK1.7 改成1.8

第二步：导包

Spring对web部分的支持 4.2.5
Spring对webMVC的支持4.2.5
aop织入包1.8.8
spring对jdbc支持4,2,5
spring和jpa集成（所需ORM包）4.2.5
junit包
Spring和AOP的集成包
Hibernate核心包
数据库驱动包5,1,6
连接池包1.2.2
SpringMVC返回Json的包

拷贝网址：https://www.jianshu.com/p/ecbf0c37cb08

第三步：创建结构

第四步：编写applicationContext.xml

①新建jdbc.properties（并且引入）---->连接数据库的配置

在这个地方记得要加classpath，在tomcat服务器运行不加它找到不到这个文件的

②配置DataSource（数据源，连接池）----->DBCP的数据源

③配置EntityManagerFactory【把核心对象交给Spring管理】--- 关键步骤

alt + insert ----> jpa ----->第二个（entityManagerFactory）

需要四大金刚 + 方言 + 显示SQL + 建表策略

扫描 packagerToScan value = domain完全限定名
适配器jpaVendorAdapter value = HIbernateJpaVendorAdapter完全限定名
方言找 value = MySQLDialect完全限定名

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="packagesToScan" value="cn.zx.ssj.domain"/>

        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect"/>
                <property name="generateDdl" value="true"/>
                <property name="showSql" value="true"/>
            </bean>
        </property>
    </bean>

④Domain，Dao，Service 等 ---- >不要求第四步写，随时可以写

Domain

@Entity
@Table(name = "t_product")
public class Product {
    @Id
    @GeneratedValue
    private Long id;
    private String name;

Test

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SsjTest {

    @Autowired
    public EntityManagerFactory factory;

    @Test
    public void test() throws Exception{
        System.out.println(factory);
    }
}

测试结果图

Dao

增Save
删delete
改Update
查一条FindOne
查全部 FindAll

public interface IEmployeeDao {
    void save(Employee emloyee);
    void updata(Employee emloyee);
    void delete(Long id);
    Employee FindOne(Long id);
    List<Employee> FindAll();
}

@Repository
public class EmployeeDaoImpl implements IEmployeeDao{

    /*
    Persistence（持久化）Context (上下文)....Spring看到这里需要一个EntityManager，
            如果找到了就直接给你，如果没找到就创建一个给你
     */

    @PersistenceContext
    private EntityManager entityManager;


    @Override
    public void save(Employee employee) {
        entityManager.persist(employee);
    }

    @Override
    public void updata(Employee employee) {
        entityManager.merge(employee);
    }

    @Override
    public void delete(Long id) {
        Employee employee = FindOne(id);
        if (employee != null){
            entityManager.remove(employee);
        }
    }

    @Override
    public Employee FindOne(Long id) {
        return entityManager.find(Employee.class,id );
    }

    @Override
    public List<Employee> FindAll() {
        return entityManager.createQuery("select o from Employee o").getResultList();
    }
}

@Transactional：只读 Propagation.SUPPORTS：不加事务

service

xml中添加扫描service包

public interface IEmployeeService {

    void save(Employee employee);
    void updata(Employee employee);
    void delete(Long id);
    Employee FindOne(Long id);
    List<Employee> FindAll();
}

@Service
@Transactional
public class EmployeeServiceImpl implements IEmployeeService{

    @Autowired
    private IEmployeeDao employeeDao;

    @Override
    public void save(Employee employee) {
        employeeDao.save(employee);
    }

    @Override
    public void updata(Employee employee) {
        employeeDao.updata(employee);
    }

    @Override
    public void delete(Long id) {
        employeeDao.delete(id);
    }

    @Override
    @Transactional(readOnly = true,propagation = Propagation.SUPPORTS)
    public Employee FindOne(Long id) {
        return employeeDao.FindOne(id);
    }

    @Override
    @Transactional(readOnly = true,propagation = Propagation.SUPPORTS)
    public List<Employee> FindAll() {
        return employeeDao.FindAll();
    }
}

注意事项

1、事务应该开在service（业务才应该是原子操作）
2、EntityManager对象不能够由我自己创建

⑤搞事务（根据AOP把事务全部加进去）

xml添加事务管理器
alt + insert ----> jpa ----->第四个（transactionManager）

⑥集成SpringMVC（applicationContext-mvc.xml web.xml Contrller）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">


    <!--扫描controller-->
    <context:component-scan base-package="cn.zx.ssj.controller"/>

    <!--静态资源放行-->
    <mvc:default-servlet-handler/>

    <!--MVC注解支持-->
    <mvc:annotation-driven/>

    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

①扫描controller

②静态资源放行（图片、css、js）

③MVC注解支持

④视图解析器

⑤上传解析器

⑦web.xml

要改成2.4。头有些不好直接拷贝一个即可

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app id="WebApp_ID" version="3.1"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">



      <!--springMVC?????? ====???SpringMVC -->
      <servlet>
            <servlet-name>dispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <!--??SpringMVC?????-->
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:applicationContext-mvc.xml</param-value>
            </init-param>
            <!--?????tomcat?????????-->
            <load-on-startup>1</load-on-startup>
      </servlet>

      <servlet-mapping>
            <servlet-name>dispatcherServlet</servlet-name>
            <!--??/????RESTful?????-->
            <url-pattern>/</url-pattern>
      </servlet-mapping>

      <!--??Spring??ContextLoaderListener??Spring????-->
      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>

      <!--??Spring?xml ===>??Spring -->
      <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
      </context-param>

      <!--????-->
      <!--??????????????????????-->
      <filter>
            <filter-name>CharacterEncodingFilter</filter-name>
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
            <init-param>
                <param-name>encoding</param-name>
                <param-value>utf-8</param-value>
            </init-param>
      </filter>

      <filter-mapping>
            <filter-name>CharacterEncodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
      </filter-mapping>
</web-app>

①SpringMVC核心控制器
②乱码问题解决

③读取Spring的xml ---- > 启动Spring

⑧controller

/**
 *  @Controller --- 这是个控制层
 *  @RequestMapping("") ---- 路径
 *  @ResponseBody --- 要返回json一定要加注解
 */

@Controller
@RequestMapping("/employee")
public class EmployeeController {

    @Autowired
    private IEmployeeService employeeService;

    @RequestMapping("index")
    public String index(){
        return "index";
    }

    //  要返回json一定要加注解---@ResponseBody
    @RequestMapping("list")
    @ResponseBody
    public List<Employee> list(){
        return employeeService.FindAll();
    }

    @RequestMapping("delete")
    @ResponseBody
    public Boolean delete(Long id){
        try {
            employeeService.delete(id);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}

⑨前端页面

employee.js

//页面读取完毕后执行
$(function(){
    //常用的组件先获取到
    var productGrid = $("#productGrid");
    //所有带来data-cmd属性的元素都加上方法
    $("*[data-cmd]").on("click",function(){
        //谁点击,this就是谁
        var methodName = $(this).data("cmd");
        //执行这个方法(动态调用)
        zx[methodName]();
    })

    zx = {
        add(){ alert("add")},
        edit(){alert("edit")},
        delete(){
            //1.获取选中的行(第一个参数是方法名)
            var row = productGrid.datagrid("getSelected");
            //2.如果没有这一行,给出提示
            if(!row){
                $.messager.alert('提示','请选择后再操作',"info");
                return;
            }
            //3.如果有这一行，给出提示
            $.messager.confirm('确认','您真的要狠心删除我嘛？',function(r){
                if (r){
                    //4.如果确定要删除,发送（Ajax）请求进行删除
                    $.post("/employee/delete",{id:row.id},function(result){
                        //5.删除完成后，成功就删除,失败就给提示
                        if(result){
                            //重新加载页面
                            productGrid.datagrid("reload");
                        }else{
                            $.messager.alert('提示','小伙子,以后努力',"error");
                        }
                    })
                }
            });
        }
    };
})

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: surho
  Date: 2019/8/28
  Time: 19:13
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <%--easyui的css样式--%>
    <link rel="stylesheet" type="text/css" href="/easyui/themes/default/easyui.css">
    <%--easyui的图标支持--%>
    <link rel="stylesheet" type="text/css" href="/easyui/themes/icon.css">
    <%--jQuery的支持--%>
    <script type="text/javascript" src="/easyui/jquery.min.js"></script>
    <%--easyui的核心功能--%>
    <script type="text/javascript" src="/easyui/jquery.easyui.min.js"></script>
    <%--中文支持--%>
    <script src="/easyui/locale/easyui-lang-zh_CN.js"></script>
    <%--引入自己的js--%>
    <script src="/js/model/employee.js"></script>
</head>
<body>
<table id="productGrid" class="easyui-datagrid"
       data-options="url:'/employee/list',fitColumns:true,singleSelect:true,fit:true,toolbar:'#tb'">
    <thead>
    <tr>
        <th data-options="field:'id',width:100">编码</th>
        <th data-options="field:'name',width:100">名称</th>
    </tr>
    </thead>
</table>

<div id="tb">
    <a href="#" data-cmd="add" class="easyui-linkbutton" data-options="iconCls:'icon-add',plain:true">添加</a>
    <a href="#" data-cmd="edit" class="easyui-linkbutton" data-options="iconCls:'icon-edit',plain:true">修改</a>
    <a href="#" data-cmd="delete" class="easyui-linkbutton" data-options="iconCls:'icon-remove',plain:true">删除</a>
</div>
</body>
</html>