Struts2获取表单的三种常见的方法
1.通过属性驱动式view plaincopy
01.<form action="sys/login.action" method="post">
02. <input type="text" name="username">
03. <input type="submit" value="submit">
04.</form>
Action:直接通过get、set方法获取。
view plaincopy
01.public class sysAction extends ActionSupport{
02. private String username;
03.
04. public String login() throws Exception {
05. System.out.println(username);
06. return SUCCESS;
07. }
08.
09. public String getUsername() {
10. return username;
11. }
12. public void setUsername(String username) {
13. this.username= username;
14. }
15.}
2.模型驱动方式，必须要实现ModelDriven<T>接口。对于要传入多个model第二种方式不方便
view plaincopy
01.<form action="sys/login.action" method="post">
02. <input type="text" name="username">
03. <input type="submit" value="submit">
04.</form>
Action:必须实现getModel() 方法
view plaincopy
01.public class sysAction extends ActionSupport implements ModelDriven<User>{
02. private User user;
03.
04. public String login() throws Exception {
05. System.out.println(getModel().getUsername());
06. return SUCCESS;
07. }
08.
09. public User getModel() {
10. if (null == user) {
11. return user = new User();
12. }
13. return user;
14. }
15.}
3.第三种方式可以完全不实现ModelDriven<T>，也可使用多个model对象的属性。
view plaincopy
01.<form action="sys/login.action" method="post">
02. <input type="text" name="user.username">
03. <input type="text" name="teacher.level">
04. <input type="submit" value="submit">
05.</form>
Action: 必须提供set方法
view plaincopy
01.public class sysAction extends ActionSupport{
02. private User user;
03. private Teacher teacher;
04.
05. public String login() throws Exception {
06. System.out.println(user.getUsername());
07. System.out.println(teacher.getLevel());
08. return SUCCESS;
09. }
10.
11. public void setUser(User user) {
12. this.user = user;
13. }
14. public void setTeacher(Teacher teacher) {
15. this.teacher = teacher;
16. }
17.}
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