首页 > 代码库 > JAVAEE学习——struts2_02：结果跳转、访问servletAPI、获得参数以及封装、练习:添加客户
JAVAEE学习——struts2_02：结果跳转、访问servletAPI、获得参数以及封装、练习:添加客户
一、结果跳转方式
<action name="Demo1Action" class="cn.itheima.a_result.Demo1Action" method="execute" > <result name="success" type="dispatcher" >/hello.jsp</result> </action>
<action name="Demo2Action" class="cn.itheima.a_result.Demo2Action" method="execute" > <result name="success" type="redirect" >/hello.jsp</result> </action>
<action name="Demo3Action" class="cn.itheima.a_result.Demo3Action" method="execute" > <result name="success" type="chain"> <!-- action的名字 --> <param name="actionName">Demo1Action</param> <!-- action所在的命名空间 --> <param name="namespace">/</param> </result> </action>
<action name="Demo4Action" class="cn.itheima.a_result.Demo4Action" method="execute" > <result name="success" type="redirectAction"> <!-- action的名字 --> <param name="actionName">Demo1Action</param> <!-- action所在的命名空间 --> <param name="namespace">/</param> </result> </action>
二、访问servletAPI方式
1.原理
2.通过ActionContext（推荐）
//如何在action中获得原生ServletAPI public class Demo5Action 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 => map Map<String, Object> sessionScope = ActionContext.getContext().getSession(); sessionScope.put("name", "sessionTom"); //application域=>map Map<String, Object> applicationScope = ActionContext.getContext().getApplication(); applicationScope.put("name", "applicationTom"); return SUCCESS; } }
3.通过ServletActionContext
//如何在action中获得原生ServletAPI public class Demo6Action extends ActionSupport { //并不推荐 public String execute() throws Exception { //原生request HttpServletRequest request = ServletActionContext.getRequest(); //原生session HttpSession session = request.getSession(); //原生response HttpServletResponse response = ServletActionContext.getResponse(); //原生servletContext ServletContext servletContext = ServletActionContext.getServletContext(); return SUCCESS; } }
4.通过实现接口方式
//如何在action中获得原生ServletAPI public class Demo7Action extends ActionSupport implements ServletRequestAware { private HttpServletRequest request; public String execute() throws Exception { System.out.println("原生request:"+request); return SUCCESS; } @Override public void setServletRequest(HttpServletRequest request) { this.request = request; } }
三、如何获得参数
1.扩展
1.1 strutsMVC
1.2 Action生命周期
1.2.1 每次请求到来时,都会创建一个新的Action实例
1.2.2 Action是线程安全的.可以使用成员变量接收参数
2.属性驱动获得参数
<form action="${pageContext.request.contextPath}/Demo8Action">
用户名:<input type="text" name="name" /><br>
年龄:<input type="text" name="age" /><br>
生日:<input type="text" name="birthday" /><br>
<input type="submit" value="http://www.mamicode.com/提交" />
</form>
//准备与参数键名称相同的属性 private String name; //自动类型转换 只能转换8大基本数据类型以及对应包装类 private Integer age; //支持特定类型字符串转换为Date ,例如 yyyy-MM-dd private Date birthday; public String execute() throws Exception { System.out.println("name参数值:"+name+",age参数值:"+age+",生日:"+birthday); return SUCCESS; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; }
3.对象驱动
<form action="${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="http://www.mamicode.com/提交" />
</form>
public class Demo9Action 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; } }
4.模型驱动
<form action="${pageContext.request.contextPath}/Demo10Action">
用户名:<input type="text" name="name" /><br>
年龄:<input type="text" name="age" /><br>
生日:<input type="text" name="birthday" /><br>
<input type="submit" value="http://www.mamicode.com/提交" />
</form>
public class Demo10Action extends ActionSupport implements ModelDriven<User> { //准备user 成员变量 private User user =new User(); public String execute() throws Exception { System.out.println(user); return SUCCESS; } @Override public User getModel() { return user; } }
四、集合类型参数封装
1.List和Map
<form action="${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="http://www.mamicode.com/提交" />
</form>
public class Demo11Action extends ActionSupport { //list private List<String> list; //Map private 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; } }
五、练习:添加客户
注意:struts和hibernate包在合并时.javassist-3.18.1-GA.jar包是重复的,删除版本低的.
实现步骤：
public class CustomerAction extends ActionSupport implements ModelDriven<Customer> { private CustomerService cs = new CustomerServiceImpl(); private Customer customer = new Customer(); //添加客户 public String add() throws Exception { //1 调用Service cs.save(customer); //2 重定向到列表action方法 return "toList"; } }
<package name="crm" namespace="/" extends="struts-default" > <action name="CustomerAction_*" class="cn.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>
JAVAEE学习——struts2_02：结果跳转、访问servletAPI、获得参数以及封装、练习:添加客户
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