Web项目开发流程

一、Spring和Hibernate集成

1、并且通过测试Test
2、把applicationContext.xml分成四个文件

  • applicationContext.xm：通用配置、引用下面三类配置
  • applicationContext-dao.xml：dao相关配置
  • applicationContext-service.xml：service相关配置
  • applicationContext-action.xml：action相关配置

3、测试DAO

二、Struts2集成

1、在struts.xml配置通配符

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">


<struts>

    <constant name="struts.devMode" value="true"></constant>
    <constant name="struts.ui.theme" value="simple"></constant>

    <package name="default" namespace="/" extends="struts-default">
        <!--拦截器栈
            在执行prepare拦截器前执行params拦截器
        -->
        <default-interceptor-ref name="paramsPrepareParamsStack"></default-interceptor-ref>
        <!--通配符-->
        <global-allowed-methods>regex:.*</global-allowed-methods>

        <action name="*_*" class="{1}Action" method="{2}">
            <result name="list">/WEB-INF/views/{1}/list.jsp</result>
            <result name="success" type="redirectAction">{1}</result>
            <result name="{2}">/WEB-INF/views/{1}/{2}.jsp</result>
        </action>

    </package>

</struts>

问题1：通配符无效

<!--通配符-->
<global-allowed-methods>regex:.*</global-allowed-methods>

三、遇到问题

3.1、更新操作时，密码丢失

  • 产生情景：因为在编辑用户信息时，没有显示密码输入框，所以在jsp传值到Action中Employee对象时，password为null，如何直接把该Employee对象更新到数据库时，就会造成丢失密码。

  • 解决方案：让Action实现 Preparable 接口来拦截saveOrUpdate方法。由于使用默认拦截器栈(defaultStack)，prepare拦截器是在params拦截器前，所以在执行prepareSaveOrUpdate的时候是无法拿到参数值，所以需要换一个拦截器栈paramsPrepareParamsStack

    /**
     * 会拦截所有的方法
     * 会在所有action执行前执行
     */
    @Override
    public void prepare() throws Exception {
    }

    /**
     * 只会在 saveOrUpdate方法执行前执行
     * 默认拦截器栈defaultStack，prepare拦截器是在params拦截器前
     * 所以在执行prepareSaveOrUpdate的时候是无法拿到参数值，所以
     * 需要换一个拦截器栈paramsPrepareParamsStack
     */
    public void prepareSaveOrUpdate() {
        if (employee.getId() != null) {
            employee = employeeService.get(employee.getId());
        }
    }

3.2、更新操作时，employee对象是如何刷新成为最新数据

package com.revanwang.ssh.rbac.web.action;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.Preparable;
import com.revanwang.ssh.rbac.domain.Department;
import com.revanwang.ssh.rbac.domain.Employee;
import com.revanwang.ssh.rbac.service.IDepartmentService;
import com.revanwang.ssh.rbac.service.IEmployeeService;
import lombok.Getter;
import lombok.Setter;

import java.util.List;


public class EmployeeAction extends ActionSupport implements Preparable {

    private final String LIST = "list";

    @Setter
    private IEmployeeService employeeService;
    @Setter
    private IDepartmentService departmentService;
    @Getter
    private Employee employee = new Employee();

    @Override
    public String execute() throws Exception {
        System.out.println("EmployeeAction.execute");
        List<Employee> employees = employeeService.getList();
        List<Department> departments = departmentService.getList();
        ActionContext.getContext().put("employees", employees);
        ActionContext.getContext().put("depts", departments);
        return LIST;
    }

    @Override
    public String input() throws Exception {
        System.out.println("DepartmentAction.input" + employee);
        List<Department> departments = departmentService.getList();
        ActionContext.getContext().put("depts", departments);
        if (employee.getId() != null) {
            employee = employeeService.get(employee.getId());
        }
        return INPUT;
    }

    public String delete() {
        System.out.println("DepartmentAction.delete" + employee);
        if (employee.getId() != null) {
            employeeService.delete(employee);
        }
        return SUCCESS;
    }

    /**
     * 保存或者更新
     */
    public String saveOrUpdate() {
        System.out.println("DepartmentAction.saveOrUpdate" + employee);
        if (employee.getId() == null) {
            //新增Employee
            employeeService.save(employee);
        } else {
            //更新Employee
            employeeService.update(employee);
        }
        return SUCCESS;
    }


    /**
     * 会拦截所有的方法
     * 会在所有action执行前执行
     */
    @Override
    public void prepare() throws Exception {
    }

    /**
     * 只会在 saveOrUpdate方法执行前执行
     * 默认拦截器栈defaultStack，prepare拦截器是在params拦截器前
     * 所以在执行prepareSaveOrUpdate的时候是无法拿到参数值，所以
     * 需要换一个拦截器栈paramsPrepareParamsStack
     */
    public void prepareSaveOrUpdate() {
        System.out.println("EmployeeAction.prepareSaveOrUpdate_1:" + employee);
        if (employee.getId() != null) {
            System.out.println("EmployeeAction.prepareSaveOrUpdate_2:" + employeeService.get(employee.getId()));
            employee = employeeService.get(employee.getId());
            System.out.println("EmployeeAction.prepareSaveOrUpdate_3:" + employee);
        }
    }
}
  • 输出打印
EmployeeAction.prepareSaveOrUpdate_1:Employee{id=7, name='Revan_W', password='null', email='Revan@qq.com', age=18, admin=true, department=Department{id=2, name='null', sn='null'}}
Hibernate: 
    select
        employee0_.id as id1_1_0_,
        employee0_.name as name2_1_0_,
        employee0_.password as password3_1_0_,
        employee0_.email as email4_1_0_,
        employee0_.age as age5_1_0_,
        employee0_.admin as admin6_1_0_,
        employee0_.depart_id as depart_i7_1_0_ 
    from
        Employee employee0_ 
    where
        employee0_.id=?
Hibernate: 
    select
        department0_.id as id1_0_0_,
        department0_.name as name2_0_0_,
        department0_.sn as sn3_0_0_ 
    from
        Department department0_ 
    where
        department0_.id=?
EmployeeAction.prepareSaveOrUpdate_2:Employee{id=7, name='Revan', password='1', email='Revan@qq.com', age=28, admin=true, department=Department{id=2, name='???', sn='Z01'}}
EmployeeAction.prepareSaveOrUpdate_3:Employee{id=7, name='Revan', password='1', email='Revan@qq.com', age=28, admin=true, department=Department{id=2, name='???', sn='Z01'}}
DepartmentAction.saveOrUpdateEmployee{id=7, name='Revan_W', password='1', email='Revan@qq.com', age=18, admin=true, department=Department{id=2, name='???', sn='Z01'}}
Hibernate: 
    update
        Employee 
    set
        name=?,
        password=?,
        email=?,
        age=?,
        admin=?,
        depart_id=? 
    where
        id=?
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