Struts的属性驱动和模型驱动
struts2中我们可以使用Model-Driven和Property-Driven进行表单数据的封装，便于我们在Action中直接使用
属性驱动时，只要保持表单域名字和Action属性名一致，即可自动进行值得填充。
第一种
http://localhost:8080/Struts/paramter?username=aa&password=bb
访问的路径和参数username=aa&password=bb
代码
package org.heinrich.action;
import com.opensymphony.xwork2.ActionSupport;
public class ParamterAction extends ActionSupport {
private static final long serialVersionUID = -8556185601880040463L;
private String username;
private String password;
public String login(){
System.out.println(username);
System.out.println(password);
return SUCCESS;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
hr-user.xml文件
<action name="paramter" class="org.heinrich.action.ParamterAction" method="login"> <result>/success.jsp</result> </action>
在Action中直接可以拿到
username :heinrich password :123456
在页面上我要拿到username和passowrd的话
username : ${username }
password : ${password }
框架会为你把username和password传到下一个页面
username : heinrich password : 123456
还有一个属性驱动的方式
http://localhost:8080/Struts/paramter?user.username=heinrich&user.password=123456
参数传递方式user.username=heinrich&user.password=123456
package org.heinrich.action;
import org.heinrich.User;
import com.opensymphony.xwork2.ActionSupport;
public class ParamterAction extends ActionSupport {
private static final long serialVersionUID = -8556185601880040463L;
private User user;
public String login(){
System.out.println(user.getUsername());
System.out.println(user.getPassword());
return SUCCESS;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
获取前台传过来的参数,还会把他放到下个页面使用
页面取值
username : ${user.username }
password : ${user.password }
还有一种基于模型驱动的方式,官方不推荐使用,我比较喜欢用官方的
package org.heinrich.action;
import org.heinrich.User;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class ParamterAction extends ActionSupport implements ModelDriven<User>{
private static final long serialVersionUID = -8556185601880040463L;
private User user = new User();
public String login(){
System.out.println(user.getUsername());
System.out.println(user.getPassword());
return SUCCESS;
}
@Override
public User getModel() {
return user;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
在我看来这种方式不错,用来做Abstract类的Action的时候很好用
其实还有
方法3：可以通过ActionContext对象Map parameterMap=context.getParameters();方法，得到请求参数Map，然后通过parameterMap来获取请求参数。需要注意的是：当通过parameterMap的键取得参数值时，取得是一个数组对象，即同名参数的值的集合。
package org.heinrich.action;
import java.util.Map;
import org.heinrich.User;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class ParamterAction extends ActionSupport{
private static final long serialVersionUID = -8556185601880040463L;
public String login(){
Map<String, Object> contextMap = ActionContext.getContext().getParameters();
for(String key:contextMap.keySet()){
Object object = contextMap.get(key);
System.out.println(key+" :"+object.toString());
}
return SUCCESS;
}
}
方法4：通过ActionContext取得HttpServletRequest对象，然后使用request.getParameter("参数名")得到参数值。
package org.heinrich.action;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import org.heinrich.User;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class ParamterAction extends ActionSupport{
private static final long serialVersionUID = -8556185601880040463L;
public String login(){
HttpServletRequest request =(HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
String username = request.getParameter("user.username");
String password = request.getParameter("user.password");
System.out.println(username);
System.out.println(password);
request.setAttribute("username", username);
request.setAttribute("password", password);
return SUCCESS;
}
}