舉一個(gè)例子：工程中有一個(gè)公司列表頁(yè)面companyList.jsp、一個(gè)公司信息編輯頁(yè)面companyForm.jsp，一個(gè)action CompanyAction。在公司列表頁(yè)面上點(diǎn)擊某個(gè)公司的Id字段就跳轉(zhuǎn)到公司信息編輯頁(yè)面，編輯完成后點(diǎn)擊save按鈕又返回到companyList.jsp。
companyList.jsp的代碼：
<%@ include file="/common/taglibs.jsp"%>
<head>
<title><fmt:message key="companyList.title"/></title>
<meta name="heading" content="<fmt:message key='companyList.heading'/>"/>
<meta name="menu" content="CompanyMenu"/>
</head>
<c:out value="${buttons}" escapeXml="false" />
<display:table name="companies" class="table" requestURI="" id="companyList" export="true" pagesize="25">
<display:column property="id" sortable="true" href="editCompany.html" media="html"
paramId="id" paramProperty="id" titleKey="company.id"/>
<display:column property="name" sortable="true" titleKey="company.name"/>
</display:table>
<script type="text/javascript">
highlightTableRows("companyList");
</script>
其中id列的連接為editCompany.html，實(shí)際上就是companyForm.jsp，Struts 2會(huì)進(jìn)行映射的。
companyForm.jsp的代碼：
<%@ include file="/common/taglibs.jsp"%>
<head>
<title><fmt:message key="companyDetail.title"/></title>
<meta name="heading" content="<fmt:message key='companyDetail.heading'/>"/>
</head>
<s:form id="companyForm" action="saveCompany" method="post" validate="true">
<li style="display: none">
<s:hidden key="company.id"/>
</li>
<s:textfield key="company.name" required="false" maxlength="50" cssClass="text medium"/>
<li class="buttonBar bottom">
<s:submit cssClass="button" method="save" key="button.save" theme="simple"/>
<s:submit cssClass="button" method="delete" key="button.delete"
onclick="return confirmDelete('Company')" theme="simple"/>
<s:submit cssClass="button" method="cancel" key="button.cancel" theme="simple"/>
</li>
</s:form>
<script type="text/javascript">
Form.focusFirstElement($("companyForm"));
</script>
CompanyAction的代碼：
public class CompanyAction extends BaseAction implements Preparable {
private GenericManager<Company, Long> companyManager;
private Company company;
private Long id;
public void setCompanyManager(GenericManager<Company, Long> companyManager) {
this.companyManager = companyManager;
}
public void setId(Long id) {
this. id = id;
}
public Company getCompany() {
return company;
}
public void setCompany(Company company) {
this.company = company;
}
public String delete() {
companyManager.remove(company.getId());
return SUCCESS;
}
public String edit() {
if (id != null) {
company = companyManager.get(id);
} else {
company = new Company();
}
return SUCCESS;
}
public String save() throws Exception {
if (cancel != null) {
return "cancel";
}
if (delete != null) {
return delete();
}
boolean isNew = (company.getId() == null);
companyManager.save(company);
return SUCCESS;
}
}
struts.xml中的相關(guān)配置：
<action name="editCompany" class="com.opentide.openstore.webapp.action.CompanyAction" method="edit">
<result>/WEB-INF/pages/companyForm.jsp</result>
<result name="error">/WEB-INF/pages/companyList.jsp</result>
</action>
<action name="saveCompany" class="com.opentide.openstore.webapp.action.CompanyAction" method="save">
<result name="input">/WEB-INF/pages/companyForm.jsp</result>
<result name="cancel" type="redirect">companyList.jsp</result>
<result name="delete" type="redirect">companyList.jsp</result>
<result name="success" type="redirect">companyList.jsp</result>
</action>
如果現(xiàn)在有一個(gè)customerForm.jsp，要在該頁(yè)面上提供編輯公司信息的入口，編輯完畢并保存后返回到customerForm.jsp。這個(gè)要求可以擴(kuò)展為“從哪個(gè)頁(yè)面轉(zhuǎn)進(jìn)來(lái)，處理完畢后就轉(zhuǎn)到原來(lái)的頁(yè)面”，這該如何實(shí)現(xiàn)呢？
在目前的配置中，CompanyAction的各個(gè)result指向的頁(yè)面是寫(xiě)死的，如果能夠在運(yùn)行時(shí)才確定各個(gè)result指向的頁(yè)面就好了，恰好Struts 2提供了這樣的方法。
修改CompanyAction，為它增加一個(gè)屬性ReturnUrl，用來(lái)保存處理完畢時(shí)要跳轉(zhuǎn)回去的頁(yè)面：
private String returnUrl;
public String getReturnUrl() {
return returnUrl;
}
public void setReturnUrl(String returnUrl) {
this.returnUrl = returnUrl;
}
修改struts.xml中saveCompany的配置，各個(gè)result指向的頁(yè)面從returnUrl參數(shù)取得：
<action name="saveCompany" class="com.opentide.openstore.webapp.action.CompanyAction" method="save">
<result name="input">/WEB-INF/pages/companyForm.jsp</result>
<result name="cancel" type="redirect">${returnUrl}</result>
<result name="delete" type="redirect">${returnUrl}</result>
<result name="success" type="redirect">${returnUrl}</result>
</action>
修改companyForm.jsp，為表單增加一個(gè)名為returnUrl的隱藏域，用于記錄returnUrl參數(shù)的值，并且在提交表單的時(shí)候?yàn)樵搮?shù)重新賦值：
<s:hidden key="returnUrl" />
最后修改companyList.jsp，為跳轉(zhuǎn)到companyForm.jsp的連接增加returnUrl參數(shù)，參數(shù)值為companyList.jsp本身（即通知companyForm.jsp，處理完畢后還回到現(xiàn)在companyList.jsp頁(yè)面）：
<display:column property="id" sortable="true" href="editCompany.html?returnUrl=companyList.jsp" media="html"
paramId="id" paramProperty="id" titleKey="company.id"/>
發(fā)布修改后的工程并運(yùn)行，果然達(dá)到了預(yù)期的目的。
要在其它頁(yè)面上提供公司信息編輯的入口，只要在該頁(yè)面上提供一個(gè)連接，連接地址為editCompany.html?returnUrl=<當(dāng)前頁(yè)面地址>即可。
posted on 2008-03-13 21:14
雨奏 閱讀(3849)
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