案例43-crm练习获取客户列表

Posted 2020-10-26 jepson6669

1 src下配置文件

1 struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <!-- 指定struts2是否以开发模式运行
            1.热加载主配置.(不需要重启即可生效)
            2.提供更多错误信息输出,方便开发时的调试
     -->
    <constant name="struts.devMode" value="true"></constant>
    <package name="crm" namespace="/" extends="struts-default" >
        <action name="CustomerAction_*" class="www.test.web.action.CustomerAction" method="{1}" >
            <result name="list" >/jsp/customer/list.jsp</result>
        </action>
    </package>
</struts>

View Code

2 hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
    
        <!-- 
        #hibernate.dialect org.hibernate.dialect.mysqlDialect
        #hibernate.dialect org.hibernate.dialect.MySQLInnoDBDialect
        #hibernate.dialect org.hibernate.dialect.MySQLMyISAMDialect
        #hibernate.connection.driver_class com.mysql.jdbc.Driver
        #hibernate.connection.url jdbc:mysql:///test
        #hibernate.connection.username gavin
        #hibernate.connection.password
         -->
         <!-- 数据库驱动 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
         <!-- 数据库url -->
        <property name="hibernate.connection.url">jdbc:mysql:///hibernate</property>
         <!-- 数据库连接用户名 -->
        <property name="hibernate.connection.username">root</property>
         <!-- 数据库连接密码 -->
        <property name="hibernate.connection.password">root</property>
        <!-- 数据库方言
            不同的数据库中,sql语法略有区别. 指定方言可以让hibernate框架在生成sql语句时.针对数据库的方言生成.
            sql99标准: DDL 定义语言  库表的增删改查
                      DCL 控制语言  事务 权限
                      DML 操纵语言  增删改查
            注意: MYSQL在选择方言时,请选择最短的方言.
         -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        
        
        <!-- #hibernate.show_sql true 
             #hibernate.format_sql true
        -->
        <!-- 将hibernate生成的sql语句打印到控制台 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 将hibernate生成的sql语句格式化(语法缩进) -->
        <property name="hibernate.format_sql">true</property>
        <!-- 
        ## auto schema export  自动导出表结构. 自动建表
        #hibernate.hbm2ddl.auto create        自动建表.每次框架运行都会创建新的表.以前表将会被覆盖,表数据会丢失.(开发环境中测试使用)
        #hibernate.hbm2ddl.auto create-drop 自动建表.每次框架运行结束都会将所有表删除.(开发环境中测试使用)
        #hibernate.hbm2ddl.auto update(推荐使用) 自动生成表.如果已经存在不会再生成.如果表有变动.自动更新表(不会删除任何数据).
        #hibernate.hbm2ddl.auto validate    校验.不自动生成表.每次启动会校验数据库中表是否正确.校验失败.
         -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        
         <!-- 指定hibernate操作数据库时的隔离级别 
            #hibernate.connection.isolation 1|2|4|8        
            0001    1    读未提交
            0010    2    读已提交
            0100    4    可重复读
            1000    8    串行化
         -->
         <property name="hibernate.connection.isolation">4</property>
         
         <!-- 指定session与当前线程绑定 -->
         <property name="hibernate.current_session_context_class">thread</property>
         
        <!-- 引入orm元数据
            路径书写: 填写src下的路径
         -->
        <mapping resource="www/test/domain/Customer.hbm.xml" />
        <mapping resource="www/test/domain/LinkMan.hbm.xml" />
        
    </session-factory>
</hibernate-configuration>

View Code

2 web层

1 web.action下的CustomerAction

package www.test.web.action;

import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.apache.struts2.ServletActionContext;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Restrictions;

import com.opensymphony.xwork2.ActionSupport;

import www.test.domain.Customer;
import www.test.service.CustomerService;
import www.test.service.impl.CustomerServiceImpl;

public class CustomerAction extends ActionSupport {
    private CustomerService cs = new CustomerServiceImpl();
    
    public String list() throws Exception {
        //1 接受参数
        String cust_name = ServletActionContext.getRequest().getParameter("cust_name");
        //2 创建离线查询对象
        DetachedCriteria dc =DetachedCriteria.forClass(Customer.class);
        //3 判断参数拼装条件
        if(StringUtils.isNotBlank(cust_name)){
            dc.add(Restrictions.like("cust_name", "%"+cust_name+"%"));
        }
        //4 调用Service将离线对象传递
        List<Customer> list = cs.getAll(dc);
        //5 将返回的list放入request域.转发到list.jsp显示
        ServletActionContext.getRequest().setAttribute("list", list);
        return "list";
    }
}

3 service层

public List<Customer> getAll(DetachedCriteria dc) {
    Session session =  HibernateUtils.getCurrentSession();
    //打开事务
    Transaction tx = session.beginTransaction();
    List<Customer> list = customerDao.getAll(dc);
    //关闭事务
    tx.commit();
    return list;
}

4 dao层

public List<Customer> getAll(DetachedCriteria dc) {
    //1 获得session
    Session session = HibernateUtils.getCurrentSession();
    //2 将离线对象关联到session
    Criteria c = dc.getExecutableCriteria(session);
    //3 执行查询并返回
    return c.list();
}