Struts2学习笔记（第二天）

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1. 今日任务

·Struts2结果处理方式

·Struts2获得ServletAPI

·Struts2参数获得方式

·CRM练习案例-添加客户

2.相关知识

2.1 Struts2结果处理方式

2.1.1全局结果页面

<global-results>

</global-results>

2.1.2 局部结果页面

Struts2的结果类型在struts2-core-2.3.32.jar包下的struts-default.xml配置文件里

<!-- 转发到action --><result-type name="chain" class="com.opensymphony.xwork2.ActionChainResult"/><!-- 转发到jsp --><result-type name="dispatcher" class="org.apache.struts2.dispatcher.ServletDispatcherResult" default="true"/><result-type name="freemarker" class="org.apache.struts2.views.freemarker.FreemarkerResult"/><result-type name="httpheader" class="org.apache.struts2.dispatcher.HttpHeaderResult"/><!-- 重定向到jsp --><result-type name="redirect" class="org.apache.struts2.dispatcher.ServletRedirectResult"/><!-- 重定向到action --><result-type name="redirectAction" class="org.apache.struts2.dispatcher.ServletActionRedirectResult"/><!-- 用于下载 --><result-type name="stream" class="org.apache.struts2.dispatcher.StreamResult"/><result-type name="velocity" class="org.apache.struts2.dispatcher.VelocityResult"/><result-type name="xslt" class="org.apache.struts2.views.xslt.XSLTResult"/><result-type name="plainText" class="org.apache.struts2.dispatcher.PlainTextResult" /><result-type name="postback" class="org.apache.struts2.dispatcher.PostbackResult" />

2.2 Struts2获得ServletAPI

原理图：

2.2.1 通过ActionContext

public class Demo1Action extends ActionSupport {public String execute() throws Exception {//request域=> map (struts2并不推荐使用原生request域)//不推荐Map<String, Object> requestScope = (Map<String, Object>) ActionContext.getContext().get("request");//推荐ActionContext.getContext().put("name", "requestTom");//session域 => mapMap<String, Object> sessionScope = ActionContext.getContext().getSession();sessionScope.put("name", "sessionTom");//application域=>mapMap<String, Object> applicationScope = ActionContext.getContext().getApplication();applicationScope.put("name", "applicationTom");return SUCCESS;}}

2.2.2 通过ServletActionContext

public class Demo2Action extends ActionSupport {//并不推荐public String execute() throws Exception {//原生requestHttpServletRequest request = ServletActionContext.getRequest();//原生sessionHttpSession session = request.getSession();//原生responseHttpServletResponse response = ServletActionContext.getResponse();//原生servletContextServletContext servletContext = ServletActionContext.getServletContext();return SUCCESS;}}

2.2.3 通过实现接口访问

public class Demo7Action extends ActionSupport implements ServletRequestAware {private HttpServletRequest request;public String execute() throws Exception { System.out.println("原生request:"+request);return SUCCESS;}@Overridepublic void setServletRequest(HttpServletRequest request) {this.request = request;}}

2.3 Struts2参数获得方式

2.3.1 属性驱动获得参数

代码：

public class Demo8Action extends ActionSupport  {public Demo8Action() {super();System.out.println("demo8Action被创建了!");}//准备与参数键名称相同的属性private String name;//自动类型转换 只能转换8大基本数据类型以及对应包装类private Integer age;//支持特定类型字符串转换为Date ,例如 yyyy-MM-ddprivate Date   birthday;public String execute() throws Exception { System.out.println("name参数值:"+name+",age参数值:"+age+",生日:"+birthday);return SUCCESS;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}}

前台页面：

<%@ 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=UTF-8"><title>Insert title here</title></head><body><form action="${pageContext.request.contextPath}/Demo8Action">用户名:<input type="text" name="name" /><br>年龄:<input type="text" name="age" /><br>生日:<input type="text" name="birthday" /><br><input type="submit" value="提交" /></form></body></html>

2.3.2 对象驱动

代码：

//struts2如何获得参数-方式2public class Demo2Action extends ActionSupport  {//准备user对象private User user;public String execute() throws Exception { System.out.println(user);return SUCCESS;}public User getUser() {return user;}public void setUser(User user) {this.user = user;}}

前台页面：

<%@ 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=UTF-8"><title>Insert title here</title></head><body><form action="${pageContext.request.contextPath}/Demo9Action">用户名:<input type="text" name="user.name" /><br>年龄:<input type="text" name="user.age" /><br>生日:<input type="text" name="user.birthday" /><br><input type="submit" value="提交" /></form></body></html>

2.3.3 模型驱动

代码：

public class Demo3Action extends ActionSupport implements ModelDriven<User> {//准备user 成员变量private User user =new User();public String execute() throws Exception { System.out.println(user);return SUCCESS;}@Overridepublic User getModel() {return user;}}

前台页面：

<%@ 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=UTF-8"><title>Insert title here</title></head><body><form action="${pageContext.request.contextPath}/Demo10Action">用户名:<input type="text" name="name" /><br>年龄:<input type="text" name="age" /><br>生日:<input type="text" name="birthday" /><br><input type="submit" value="提交" /></form></body></html>

2.3.4 集合类型参数封装

代码：

//struts2 封装集合类型参数public class Demo11Action extends ActionSupport  {//listprivate List<String> list;//Mapprivate Map<String,String> map;public String execute() throws Exception { System.out.println("list:"+list);System.out.println("map:"+map);return SUCCESS;}public List<String> getList() {return list;}public void setList(List<String> list) {this.list = list;}public Map<String, String> getMap() {return map;}public void setMap(Map<String, String> map) {this.map = map;}}

前台页面：

<%@ 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=UTF-8"><title>Insert title here</title></head><body><form action="${pageContext.request.contextPath}/Demo11Action" method="post" >list:<input type="text" name="list" /><br>list:<input type="text" name="list[3]" /><br>map:<input type="text" name="map['haha']" /><br><input type="submit" value="提交" /></form></body></html>

3.crm案例

CRM练习案例-添加客户

编写Action类save方法

public class CustomerAction extends ActionSupport implements ModelDriven<Customer>{private Customer customer = new Customer();private CustomerService customerService = new CustomerServiceImpl();/** * 获取客户列表 * @return * @throws Exception  */public String list() throws Exception{DetachedCriteria dc = DetachedCriteria.forClass(Customer.class);//获取请求参数（明天才学Struts2参数获取 暂时用此方法代替）HttpServletRequest request = ServletActionContext.getRequest();//获取当期页int currentPage = 1;//如果参数为空 默认显示第一页if (request.getParameter("currentPage")!=null && !request.getParameter("currentPage").equals("")) {currentPage = Integer.parseInt(request.getParameter("currentPage"));}//获取筛选客户名称String cust_name = request.getParameter("cust_name");if (cust_name!=null) {//如果筛选客户名称不为空添加模糊查询条件dc.add(Restrictions.like("cust_name", "%"+cust_name+"%"));}//设置每一页显示几条记录int pageSize = 10;//调用业务层获取客户列表PageBean<Customer> pb = customerService.getCustomerByPage(dc,currentPage,pageSize);request.setAttribute("pb", pb);return "list";}/** * 添加客户 * @return * @throws Exception */public String save() throws Exception{customerService.save(customer);return "toList";}@Overridepublic Customer getModel() {// TODO Auto-generated method stubreturn customer;}}

修改struts配置文件

<?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.devMode" value="true"></constant><constant name="struts.i18n.encoding" value="UTF-8"></constant><constant name="struts.configuration.xml.reload" value="true" /><package name="crm" namespace="/" extends="struts-default"><action name="CustomerAction_*" class="com.itheima.web.action.CustomerAction"method="{1}"><result name="list">/jsp/customer/list.jsp</result><result name="toList" type="redirectAction"><param name="actionName">CustomerAction_list</param><param name="namespace">/</param></result></action></package></struts>

测试

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