第一种参数获取方式：
编写一个前端页面，提交表单，做示例：
<form action="${pageContext.request.contextPath}/Demo1Action">
用户名:<input type="text" name="name" /><br>
年龄:<input type="text" name="age" /><br>
生日:<input type="text" name="birthday" /><br>
<input type="submit" value="提交" />
</form>
每次访问Action都会创建一个新的实例（线程安全）：
package param; import java.util.Date; import com.opensymphony.xwork2.ActionSupport;
//第一种方式
public class Demo1Action extends ActionSupport { private String name;
private Integer age;
private Date birthday; public String execute() throws Exception{
System.out.println("name参数值:"+name+",age参数值:"+age+",生日:"+birthday);
return SUCCESS;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public Integer getAge() {
return age;
} public void setAge(Integer age) {
this.age = age;
} public Date getBirthday() {
return birthday;
} public void setBirthday(Date birthday) {
this.birthday = birthday;
} }
第二种方式获取参数：
封装一个实体类：
package domain;
import java.util.Date;
public class User {
private String name;
private Integer age;
private Date birthday;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User [name=" + name + ", age=" + age + ", birthday=" + birthday + "]";
}
}
表单要修改下：
<form action="${pageContext.request.contextPath}/Demo2Action">
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>
获取参数：
package param; import com.opensymphony.xwork2.ActionSupport; import domain.User; //struts2如何获得参数-方式2
public 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;
} }
第三种方式获取参数：
模型驱动：
前端代码：
<form action="${pageContext.request.contextPath}/Demo3Action">
用户名:<input type="text" name="name" /><br>
年龄:<input type="text" name="age" /><br>
生日:<input type="text" name="birthday" /><br>
<input type="submit" value="提交" />
</form>
获取参数：
package param; import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven; import domain.User; public class Demo3Action extends ActionSupport implements ModelDriven<User> { private User user = new User(); public String execute() throws Exception { System.out.println(user); return SUCCESS;
} @Override
public User getModel() {
return user;
} }
第四种获取参数方式：
集合类型封装：
前端表单：
<form action="${pageContext.request.contextPath}/Demo4Action" 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>
获取参数：
package param; import java.util.List;
import java.util.Map; import com.opensymphony.xwork2.ActionSupport; //struts2 封装集合类型参数
public class Demo4Action 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;
} }
这里获得的参数直接封装到集合中