21.Struts2_CRUD操作(1)查询和删除

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先导入struts2必要的包放在lib下，并配置web.xml

1.结构目录

2.代码

（1）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>

（2）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><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="">Edit</a></td><td><a href="emp-delete?employeeId=${employeeId}">Delete</a></td></tr></s:iterator></body></table></body></html>

（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();}}

(4).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","aa@qq.com"));emps.put(1002, new Employee(1002,"bb","BB","bb@qq.com"));emps.put(1005, new Employee(1005,"ff","FF","ff@qq.com"));emps.put(1004, new Employee(1004,"dd","DD","dd@qq.com"));emps.put(1003, new Employee(1003,"cc","CC","cc@qq.com"));}public List<Employee> getEmployee(){return new ArrayList<>(emps.values());}public void delete(Integer empId) {emps.remove(empId);} public void save(Employee emp) {long time=System.currentTimeMillis();emp.setEmployeeId((int)time);emps.put(emp.getEmployeeId(),emp);}public Employee get(Integer empId) {return emps.get(empId);}public void update(Employee emp) {emps.put(emp.getEmployeeId(),emp);}}

(5）.EmployeeAction.java

package struts.app;import java.util.Map;import org.apache.struts2.interceptor.RequestAware;import com.opensymphony.xwork2.ModelDriven;public class EmployeeAction implements RequestAware{private Dao dao=new Dao();//需要在当前的EmployeeAction中定义employeeId的属性。//以接收请求参数private Integer employeeId;public void setEmployeeId(Integer employeeId) {this.employeeId=employeeId;}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";}public String list() {request.put("emps",dao.getEmployee());return "list";}private Map<String,Object> request;@Overridepublic void setRequest(Map<String, Object> arg0) {this.request=arg0;}}

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"><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>

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