1.总结: 1 ModelDriven 来封装前台数据, 通过struts2的参数拦截器,封装到action中的成员变量中,在写方法中,千万不要写参数否则会报找不到save,update等方法的错误,我找了近近一个小时才找到!
action:
public class EmployeeAction extends ActionSupport implements ModelDriven<Employee>{
private IEmployeeService employeeService = new EmployeeService();
/*****封装数据**************/
private Employee emp = new Employee();
public void setEmp(Employee emp) {
this.emp = emp;
}
public Employee getEmp() {
return emp;
}
public Employee getModel() {
return emp;
}
public String save(){//不能加参数 save(Employee emp)
try {
//1.调用service
employeeService.save(emp);
//2.跳转页面
return list();
} catch (Exception e) {
e.printStackTrace();
return ERROR;
}
}
public String list(){
try {
//1.去db中拿所有的员工数据
List<Employee> lists = employeeService.getAll();
//2.存入域对象中传到前台去 request域
ActionContext.getContext().getContextMap().put("lists", lists);
return "list";
} catch (Exception e) {
e.printStackTrace();
return ERROR;
}
}
//记住千万不能这样写, public String update(Employee emp){...},否则会报找不到这个方法的错误!参数是前台传过的来的,直接封装到了成员变量中了,
public String update(){
try {
employeeService.update(emp);
return list();
} catch (Exception e) {
e.printStackTrace();
return ERROR;
}
}
public String edit(){
try{
//1.获取当前修改的记录的主键值
int id =emp.getId();
//2.调用service查询
Employee emp = employeeService.findById(id);
//3. 数据回显 通过值栈
ValueStack vs = ActionContext.getContext().getValueStack();
vs.pop();
vs.push(emp);
return "update";
}catch (Exception e) {
e.printStackTrace();
return ERROR;
}
}
}
2.serviceimpl 省略接口
public class EmployeeService implements IEmployeeService {
IEmployeeDao employeeDao = new EmployeeDao();
public List<Employee> getAll() {
return employeeDao.getAll();
}
public Employee findById(int id) {
return employeeDao.findById(id);
}
public void save(Employee emp) {
employeeDao.save(emp);
}
public void update(Employee emp) {
employeeDao.update(emp);
}
public IEmployeeDao getEmployeeDao() {
return employeeDao;
}
public void setEmployeeDao(IEmployeeDao employeeDao) {
this.employeeDao = employeeDao;
}
}
3.daoimpl 省略接口
public class EmployeeDao implements IEmployeeDao {
public List<Employee> getAll() {
String sql = "select * from employees";
try {
return JDBCUtils.getQueryRunner().query(sql, new BeanListHandler<Employee>(Employee.class));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public Employee findById(int id) {
String sql = "select * from employees where id = ?";
try {
return JDBCUtils.getQueryRunner().query(sql, new BeanHandler<Employee>(Employee.class),id);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void save(Employee emp) {
String sql = "insert into employees (empName,workDate) values (?,?)";
try {
JDBCUtils.getQueryRunner().update(sql, emp.getEmpName(),emp.getWorkDate());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void update(Employee emp) {
String sql = "update employees set empName=?,workDate=? where id=? ";
try {
JDBCUtils.getQueryRunner().update(sql, emp.getEmpName(),emp.getWorkDate(),emp.getId());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
4.数据库连接:
public class JDBCUtils {
//1.初始化连接池
private static DataSource dataSource;
static{
dataSource = new ComboPooledDataSource();
}
public static DataSource getDataSource() {
return dataSource;
}
//2.创建一个DBUtils常用工具类对象
public static QueryRunner getQueryRunner(){
return new QueryRunner(dataSource);
}
}
5. entity 省略setter/getter 方法
public class Employee {
private int id;
private String empName;
private Date workDate;
}
二:1.web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
2.struts.xml 奇怪为什么package的name一去就报错!!!为什么不是写包名? s:token 防止request的重复提交一共三步,用session一步搞定!
<?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>
<constant name="struts.ui.theme" value="simple"></constant>
<package name="emp" extends="struts-default">
<global-results>
<result name="error">/error/error.jsp</result>
</global-results>
<action name="emp_*" class="cn.itcast.action.EmployeeAction" method="{1}">
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="token">
<param name="includeMethods">save</param>
</interceptor-ref>
<result name="invalid.token" type="redirectAction">emp_list</result>
<result name="list">/WEB-INF/list.jsp</result>
<result name="update">/WEB-INF/update.jsp</result>
</action>
</package>
</struts>
3.c3p0-config.xml
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql:///hib_demo</property>
<property name="user">root</property>
<property name="password">root</property>
<property name="initialPoolSize">5</property>
<property name="maxPoolSize">10</property>
</default-config>
<named-config name="oracleConfig">
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql:///day17</property>
<property name="user">root</property>
<property name="password">root</property>
<property name="initialPoolSize">5</property>
<property name="maxPoolSize">10</property>
</named-config>
</c3p0-config>
三:
1.add.jsp
<s:form action="/emp_save" method="post">
<s:token></s:token>
<table>
<tr>
<td>员工 </td>
<td><s:textfield name="empName"/></td>
</tr>
<tr>
<td>入职时间 </td>
<td><s:textfield name="workDate"/></td>
</tr>
<tr>
<td colspan="2"><s:submit value="保存员工"></s:submit></td>
</tr>
</table>
</s:form>
2.list.jsp
<body>
<table border="1" align="center">
<tr>
<th>序号</th>
<th>编号</th>
<th>员工名</th>
<th>入职时间</th>
<th>操作</th>
</tr>
<!-- 先判断后迭代 -->
<s:if test="#request.lists !=null">
<s:iterator var="emp" value="#request.lists" status="st">
<tr>
<td><s:property value="#st.count"/></td>
<td><s:property value="#emp.id"/></td>
<td><s:property value="#emp.empName"/></td>
<td><s:property value="#emp.workDate"/></td>
<td>
<s:a href="emp_edit?id=%{#emp.id}">修改</s:a>
</td>
</tr>
</s:iterator>
</s:if>
<s:else>
<tr><td colspan="5">sorry,没有你要的数据</td></tr>
</s:else>
</table>
</body>
3.update.jsp
<s:form action="/emp_update" method="post">
<s:hidden name="id"></s:hidden>
<table>
<tr>
<td>员工 </td>
<td><s:textfield name="empName"/></td>
</tr>
<tr>
<td>入职时间 </td>
<td><s:textfield name="workDate"/></td>
</tr>
<tr>
<td colspan="2"><s:submit value="修改员工"/></td>
</tr>
</table>
</s:form>
四:效果图
1.add.jsp
2. list.jsp
3.edit.jsp
4.update.jsp-->list.jsp
时间： 2024-11-05 11:55:31