22.Struts2_CRUD操作(2)添加和修改

1.结构目录

2.dao.java

package struts.app;    import java.util.ArrayList;  import java.util.HashMap;  import java.util.List;  import java.util.Map;    public class Dao {            private static Map<Integer,Employee> emps=new HashMap<Integer,Employee>();            static {              emps.put(1001, new Employee(1001,"aa","AA","[e-mail]"));              emps.put(1002, new Employee(1002,"bb","BB","[e-mail]"));              emps.put(1005, new Employee(1005,"ff","FF","[e-mail]"));               emps.put(1004, new Employee(1004,"dd","DD","[e-mail]"));              emps.put(1003, new Employee(1003,"cc","CC","[e-mail]"));                    }            //查询    public List<Employee> getEmployee(){          return new ArrayList<>(emps.values());      }            //删除      public void delete(Integer empId) {          emps.remove(empId);      }            //添加    public void save(Employee emp) {          long time=System.currentTimeMillis();          emp.setEmployeeId((int)time);          emps.put(emp.getEmployeeId(),emp);      }        //获取      public Employee get(Integer empId) {          return emps.get(empId);                }            //修改    public void update(Employee emp) {          emps.put(emp.getEmployeeId(),emp);      }  }  

3.Employee.java

package struts.app;    public class Employee {      private Integer employeeId;      private String firstName;      private String lastName;      private String email;            public Integer getEmployeeId() {          return employeeId;      }      public void setEmployeeId(Integer employeeId) {          this.employeeId = employeeId;      }      public String getFirstName() {          return firstName;      }      public void setFirstName(String firstName) {          this.firstName = firstName;      }      public String getLastName() {          return lastName;      }      public void setLastName(String lastName) {          this.lastName = lastName;      }      public String getEmail() {          return email;      }      public void setEmail(String email) {          this.email = email;      }      public Employee(Integer employeeId, String firstName, String lastName, String email) {          super();          this.employeeId = employeeId;          this.firstName = firstName;          this.lastName = lastName;          this.email = email;      }            public Employee() {           super();         }      @Override      public String toString() {          return "Employee [employeeId=" + employeeId + ", firstName=" + firstName + ", lastName=" + lastName + ", email="                  + email + "]";      }          }  

4.EmpoyeeAction.java

package struts.app;    import java.util.Map;    import org.apache.struts2.interceptor.RequestAware;    import com.opensymphony.xwork2.ActionContext;  import com.opensymphony.xwork2.ModelDriven;    public class EmployeeAction implements RequestAware,ModelDriven<Employee>{            private Dao dao=new Dao();            private Employee employee;            private Integer employeeId;      public void setEmployeeId(Integer employeeId) {          this.employeeId = employeeId;      }          //查询    public String list() {      request.put("emps",dao.getEmployee());      return "list";      }          //添加    public String save() {                    System.out.println("employee:"+ employee);          System.out.println("值栈站定对象:"+ ActionContext.getContext().getValueStack().peek());          //1.获取请求参数：通过定义对应属性的方式          //2.调用Dao的方法          dao.save(employee);          //3.通过redirectAction的方式响应结果给emp-list                    return "success";      }          //删除    public String delete() {          dao.delete(employeeId);          //返回结果的类型应为：redirectAction.          //也可以是chain：实际上chain是没有必要的，因为不需要在下一个Action中保存当前的Action          //还有，若使用chain，则到达目标页面后，地址栏显示的依然是删除的那个链接，刷新时会有重复提交。          return "success";      }          //修改    public String edit(){        //1.获取传入的employeeId:employee.getEmployeeId()        //2.根据employeesId  获取employee对象    //Employee emp2 = dao.get(employee.getEmployeeId());                  //3.把栈顶的对象的属性装配好:此时的栈顶对象是employee         //目前的employee 对象只有 employeeId 属性，其他属性为 null    /*    employee.setFirstName(emp2.getFirstName());    employee.setLastName(emp2.getLastName());    employee.setEmail(emp2.getEmail());    */       return "edit";    }        //更新    public String update() {    dao.update(employee);        return "success";    }          private Map<String,Object> request;      @Override      public void setRequest(Map<String, Object> arg0) {          this.request=arg0;                }        @Override      public Employee getModel() {          //判断Create  还是 edit            //若为Create，则：employeeBean  = new EmployeeBean();            //若为edit ，则从数据库中获取 employeeBean  = dao.get(employeeBean.getEmployeeId());            //判断标准为：是否有employeeId。若有则视为 edit，若没有则视为 Create            //若通过employeeId 来判断，则需要在modelDriven 拦截器之前先执行一个params拦截器            //可以通过使用paramsPrepareParams 拦截器实现            //需要在 struts.xml 文件中配置 paramsPrepareParams 为默认的拦截器栈                         if(employeeId == null){                employee  = new Employee();                         } else {                  employee = dao.get(employeeId);             }            return employee;         }  }  

5.struts.xml

<?xml version="1.0" encoding="UTF-8" ?>        <!DOCTYPE struts PUBLIC            "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"            "http://struts.apache.org/dtds/struts-2.0.dtd">    <struts>      <package name="struts" namespace="" extends="struts-default">          <default-interceptor-ref name="paramsPrepareParamsStack"></default-interceptor-ref>            <action name="emp-*" class="struts.app.EmployeeAction" method="{1}">              <result name="{1}">/emp-{1}.jsp</result>              <result name="success" type="redirectAction">/emp-list</result>          </action>                  </package>  </struts> 

6.index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><a href="emp-list.action">直接跳转页面</a></body></html>

7.emp-list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><s:debug></s:debug><form action="emp-save"><s:textfield name="firstName" label="firstName" ></s:textfield><s:textfield name="lastName" label="lastName"></s:textfield><s:textfield name="email" label="email" ></s:textfield><s:submit></s:submit></form><br><hr><br><table cellpadding="10" cellspacing="0" border="1"><thead><tr><td>ID</td><td>FirstName</td><td>LastName</td><td>Email</td><td>Edit</td><td>Delete</td></tr></thead><body><s:iterator value="#request.emps"><tr><td>${employeeId}</td><td>${firstName}</td><td>${lastName}</td><td>${email}</td><td><a href="emp-edit?employeeId=${employeeId}">Edit</a></td><td><a href="emp-delete?employeeId=${employeeId}">Delete</a></td></tr></s:iterator></body></table></body></html>

8.edit-list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><s:debug></s:debug><form action="emp-update"><s:hidden name="employeeId"></s:hidden><s:textfield name="firstName" label="firstName" ></s:textfield><s:textfield name="lastName" label="lastName"></s:textfield><s:textfield name="email" label="email" ></s:textfield><s:submit></s:submit></form></body></html>

页面结果：