Struts2的属性驱动原理和模型驱动原理

来源：互联网发布：linux重启ssh服务编辑：程序博客网时间：2024/06/05 15:46

属性驱动:(靠的是ParameterInterceptor拦截器,setValue方法操作值桟属性)

* 在action中设置属性，属性的名称和页面上表单中的name属性的名称保持一致

* 在action中的属性，必须有set和get方法

* 好处：这样设计可以保证action与servlet容器松耦合

* 如果属性驱动和模型驱动属性名重复,只有模型驱动能取到值,属性驱动为null

属性驱动原理图:

例子:

表单页面

<body>  <s:form action="testParameterInterceptor_Login">  帐号<s:textfield name="userName"/><br>  密码<s:password name="passWord"/><br>  <s:submit value="提交"/>  </s:form></body>

Action

public class TestParameterInterceptorAction extends ActionSupport {private String userName;private String passWord;public String execute() throws Exception {return SUCCESS;}public String Login() throws Exception {System.out.println("userName--->"+userName);System.out.println("passWord--->"+passWord);return null;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassWord() {return passWord;}public void setPassWord(String passWord) {this.passWord = passWord;}}

模型驱动:

* 如果在页面上的表单中，表单的内容很多，这个时候就会在action中写很多属性和属性的set,get方法,这样写代码结构不好

* 采用javabean

* 让该action实现ModelDriver

模型驱动原理图:

例子:

javaBean

public class User {private String userName;private String passWord;public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassWord() {return passWord;}public void setPassWord(String passWord) {this.passWord = passWord;}}

表单页面

<body>  <s:form action="testModelDrivenInterceptor_Login">  帐号<s:textfield name="userName"/><br>  密码<s:password name="passWord"/><br>  <s:submit value="提交"/>  </s:form></body>

Action

/** *  要用模型驱动拦截器,就需要实现ModelDriven接口,覆写getModel() */public class TestmodelDrivenInterceptorAction extends ActionSupport implements ModelDriven<User>{private User user = new User();public String execute() throws Exception {return SUCCESS;}public String Login() throws Exception {System.out.println(user.getUserName());System.out.println(user.getPassWord());return null;}public User getModel() {return this.user;}public User getUser() {return user;}public void setUser(User user) {this.user = user;}}