Struts 学习笔记 二
login.jsp 登陆页面?
<html:form action="/login" > 帐号：<html:text property="userName"/> <html:errors property="userName"/><br/> 密码：<html:password property="userPassword"/> <html:errors property="userPassword"/> <html:submit value="登录"/> </html:form>
success.jsp 登陆成功???????
<body> <center> 帐号：${loginBean.userName }<br/> 密码：${loginBean.userPassword } </center> </body>?fail.jsp 登陆失败页面
<body> 您的帐号和密码有误！ </body>
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LoginAction.java
public class LoginAction extends Action{@Overridepublic ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {LoginForm logFor=(LoginForm)form; UserManager um=new UserManager(); boolean flag=um.userLogin(logFor.getUserName(),logFor.getUserPassword()); String page="fail"; if(flag){ page="success"; } return mapping.findForward(page);}}?
?UserManager.java
public class UserManager { public boolean userLogin(String userName,String userPassword){ boolean flag=false; if("admin".equals(userName)&&"admin".equals(userPassword)){ flag=true; } return flag; } }LoginForm.java?
public class LoginForm extends ActionForm{private String userName;private String userPassword;public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserPassword() {return userPassword;}public void setUserPassword(String userPassword) {this.userPassword = userPassword;}}?
struts-config.xml??????????????
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<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd"><struts-config><data-sources /><form-beans><form-bean name="loginForm" type="com.login.LoginForm"></form-bean></form-beans><global-exceptions /><global-forwards /><action-mappings><action path="/login" attribute="loginBean" input="/login.jsp"name="loginForm" scope="request" type="com.login.LoginAction"><forward name="success" path="/success.jsp"></forward><forward name="fail" path="/fail.jsp"></forward></action></action-mappings><message-resources parameter="com.struts.ApplicationResources"></message-resources></struts-config>
<action>标签中的属性含义描述如下：
1. name：表示ActionForm的名称。也就是<form-bean>标签中的name属性的值。
2. path：表示Struts动作，必须以“/”开头。
3. scope：表示ActionForm类的对象实例（在本例中是LoginForm类的对
?象实例）保存的范围。这个属性值只能取request和session。默认值是session。
?如果scope的值为request，表示将LoginForm类的对象实例以LoginForm作为键值保存到了request的属性中。
?如果scope的值为session，表示不将LoginForm类的对象实例保存到request的属性中。
?但不管scope的值是request还是session。Struts都会将LoginForm类的对象实例保存到session的属性中。
4. type：表示LoginAction类的全名。
5. input：表示如果客户端提交的数据未通过简单验证后要跳转到的页面，也就是在
LoginForm类的validate方法中返回的ActionErrors对象中含有错误描述信息。
Struts会自动跳转到input属性所指的JSP页面。
<action>标签中的子标签<forward>定义了可以在动作类（在本例中就是LoginAction类）中读取的forward页的URL。
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一个请求的整个流程
util.RequestUtils - ??Get module name for path /login.do
util.RequestUtils - ??Module name found: default
action.RequestProcessor - Processing a 'POST' for path '/login'
util.RequestUtils -? ??Looking for ActionForm bean instance in scope 'request' under attribute key 'loginBean'
util.RequestUtils -? ??Creating new ActionForm instance of type 'com.login.LoginForm'
util.RequestUtils -? --> com.login.LoginForm@d9cbcb
action.RequestProcessor -? Storing ActionForm bean instance in scope 'request' under attribute key 'loginBean'
action.RequestProcessor -? Populating bean properties from this request
beanutils.BeanUtils - ?BeanUtils.populate(com.login.LoginForm@d9cbcb, {userName=[Ljava.lang.String;@d2b64e,
??????userPassword=[Ljava.lang.String;@1bef1ac})
beanutils.BeanUtils -?? setProperty(com.login.LoginForm@d9cbcb, userName, [admin])
beanutils.ConvertUtils - Convert string 'admin' to class 'java.lang.String'
beanutils.ConvertUtils -?? Using converter org.apache.commons.beanutils.converters.StringConverter@9e8c34
beanutils.BeanUtils -?? setProperty(com.login.LoginForm@d9cbcb, userPassword, [admin])
beanutils.ConvertUtils - Convert string 'admin' to class 'java.lang.String'
beanutils.ConvertUtils -?? Using converter org.apache.commons.beanutils.converters.StringConverter@9e8c34
action.RequestProcessor -? Validating input form properties
action.RequestProcessor -?? No errors detected, accepting input
action.RequestProcessor -? Looking for Action instance for class com.login.LoginAction
action.RequestProcessor -?? Returning existing Action instance
action.RequestProcessor - processForwardConfig(ForwardConfig
[name=success,path=/success.jsp,redirect=false,contextRelative=false])
[localhost].[/Struts1] - servletPath=/success.jsp, pathInfo=null, queryString=null, name=null
[localhost].[/Struts1] -? Path Based Forward
servlet.JspServlet - ??JspEngine --> /success.jsp
servlet.JspServlet - ????? ServletPath: /success.jsp
servlet.JspServlet - ???????? PathInfo: null
servlet.JspServlet - ???????? RealPath: E:\EXPL\tomcat5.5\webapps\Struts1\success.jsp
servlet.JspServlet - ?????? RequestURI: /Struts1/success.jsp
servlet.JspServlet - ????? QueryString: null
servlet.JspServlet - ?? Request Params:
servlet.JspServlet - ?? userName = admin
servlet.JspServlet - ?? userPassword = admin???????
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