JavaWeb -- Struts2 构建视图:标签和结果, UI组件标签
1. 示例
action 注入数据 和 处理action
/**
* OgnlAction
*/
public class UiAction extends ActionSupport {
private static final long serialVersionUID = -6933309304624396640L;
/* 婚否 */
private boolean married = true;
/* javabean集合 */
private List userList;
/*省集合*/
private List<Area> provinces ;
/* 选中的id */
private Integer selectedId = 10;
public List getUserList() {
return userList;
}
public void setUserList(List userList) {
this.userList = userList;
}
public String reg() {
popUserList();
return "success";
}
public String toRegView() {
System.out.println("toRegView");
return "loginView";
}
/**
* 保存数据,
*/
public String saveData(){
popUserList();
popProvinces();
return "showView" ;
}
/**
* 组装用户集合
*/
private void popUserList(){
userList = new ArrayList<User>();
User u = null ;
for(int i = 0 ; i < 10 ; i ++){
u = new User();
u.setId(1 + i);
u.setName("tom" + i);
u.setAge(20 + i);
userList.add(u);
}
}
/**
* 组装province集合数组
*/
private void popProvinces(){
provinces = new ArrayList<Area>();
Area p1 = new Area(1,"1号省");
p1.getCities().add(new Area(11,"1.1城市"));
p1.getCities().add(new Area(12,"1.2城市"));
p1.getCities().add(new Area(13,"1.3城市"));
Area p2 = new Area(2,"2号省");
p2.getCities().add(new Area(21,"2.1城市"));
p2.getCities().add(new Area(22,"2.2城市"));
p2.getCities().add(new Area(23,"2.3城市"));
provinces.add(p1);
provinces.add(p2);
}
public boolean isMarried() {
return married;
}
public void setMarried(boolean married) {
this.married = married;
}
public Integer getSelectedId() {
return selectedId;
}
public void setSelectedId(Integer selectedId) {
this.selectedId = selectedId;
}
public List<Area> getProvinces() {
return provinces;
}
public void setProvinces(List<Area> provinces) {
this.provinces = provinces;
}
}
showview.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>showView.jsp</title>
<style type="text/css">
.even{
background-color: blue;
}
.odd{
background-color: yellow;
}
</style>
</head>
<body>
<br>
------------------------------------------------------------------------<br>
request.username = <s:property value="#request.username" /><br>
session['username'] = <s:property value="#session.username" /><br>
application.username = <s:property value="#application.username" /><br>
attr.username = <s:property value="#attr.username" /><br>
parameters.username = <s:property value="#parameters.username" /><br>
vs.username = <s:property value="username" /><br>
vs.username = ${request['struts.valueStack']}<br>
<!-- 强制ognl表达式解析 -->
<s:textfield name="#session.username" label="%{#request.username}"/><br>
------------------------------------------------------------------------<br>
s:property<br>
<s:property value="'<hr>tom'" escape="false"/>
<br>
------------------------------------------------------------------------<br>
s:set:如果没有指定范围,则存放ActioinContext自身的map中,<br>
<s:set var="applicationmyname" value="#session['username']" />
<s:property value="applicationmyname" />
<br>------------------------------------------------------------------------<br>
s:push,将对象放到栈顶,标签结束后从栈顶删除<br>
<s:push value="#application.username">
<s:property/>
</s:push>
<br>------------------------------------------------------------------------<br>
s:bean,将创建新的javabean对象,到栈顶也可指定actionContextmap自身中<br>
<s:bean name="cn.itcast.struts2.model.User" var="mybean">
<s:param name="name" value="#request.username" />
<s:property value="name"/>
</s:bean>
<s:property value="#mybean.name"/>
<br>------------------------------------------------------------------------<br>
s:action,在jsp直接调用某个action.<br>
<s:action name="RegAction_toRegView" namespace="/regns" executeResult="true"/>
<br>------------------------------------------------------------------------<br>
s:iterator,迭代集合属性的<br>
<table border="1">
<tr>
<td>count</td><td>index</td><td>name</td><td>age</td><td>状态</td>
<td>编辑</td><td>查看</td>
</tr>
<s:iterator value="userList" var="u" status="st">
<tr class='<s:property value="#st.even?'even':'odd'" />'>
<td><s:property value="#st.count" /></td>
<td><s:property value="#st.index" /></td>
<td><s:property value="#u.name" /></td>
<td><s:property value="#u.age" /></td>
<td>
<s:if test="#u.age < 23">少年</s:if>
<s:elseif test="#u.age > 27">老年</s:elseif>
<s:else>中年</s:else>
</td>
<td>
<s:url action="UserAction_edit" namespace="/user" var="editUrl" escapeAmp="false">
<s:param name="id" value="#u.id" />
<s:param name="name" value="#u.name" />
</s:url>
<a href='<s:property value="#editUrl"/>'>编辑</a>
</td>
<td><a href='<s:url action="UserAction_view" namespace="/user"><s:param name="id" value="#u.id" /></s:url>'>查看</a></td>
</tr>
</s:iterator>
</table>
<br>------------------------------------------------------------------------<br>
s:url,访问url资源<br>
<s:url includeParams="all" var="myurl"/>
<s:property value="myurl"/>
<br>------------------------------------------------------------------------<br>
s:i18n,s:text通常结合在一起使用,访问指定资源文件中串<br>
<s:i18n name="cn.itcast.struts2.action.RegAction_zh">
<s:text name="label.age" var="mytext"/>
</s:i18n>
<s:property value="#mytext"/>
<br>------------------------------------------------------------------------<br>
访问集合的大小以及是否为空<br>
userList.size = <s:property value="userList.size"/><br>
userList.isEmpty = <s:property value="userList.isEmpty"/>
<br>------------------------------------------------------------------------<br>
ognl表示定义集合<br>
<s:iterator value="{'tom1','hjerry3','tomca5','kking7','jerrli9'}">
<s:property /><br>
</s:iterator>
<br>------------------------------------------------------------------------<br>
ognl定义map集合<br>
<s:iterator value="#{100:'tom',200:'jerry',300:'kingkong'}">
key = <s:property value="key" /> : value = <s:property value="value" /><br>
</s:iterator>
<br>------------------------------------------------------------------------<br>
集合的过滤<br>
<s:iterator value="userList.{?#this.age > 25}">
<s:property/><br>
</s:iterator>
集合的投影<br>
<s:iterator value="userList.{name}">
<s:property/><br>
</s:iterator>
<br>------------------------------------------------------------------------<br>
ognl表达式调用方法<br>
<s:property value="sayHello(#session.username)"/>
<br>------------------------------------------------------------------------<br>
ognl调用任意类的静态方法<br>
<s:property value="@cn.itcast.struts2.action.HelloWorldAction@sayStaticHello(#session.username)"/>
<br>------------------------------------------------------------------------<br>
主题:<br>
<s:form theme="xhtml">
<s:textfield name="username" label="UserName" />
</s:form>
<br>------------------------------------------------------------------------<br>
s:textfield标签<br>
<s:textfield name="username" key="label.name.global" theme="xhtml" value='%{username}'/>
<br>------------------------------------------------------------------------<br>
s:checkbox<br>
<s:checkbox name="married" label="婚否" />
</body>
</html>
reg.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>reg.jsp</title>
</head>
<body>
<s:debug />
<s:form namespace="/ui" action="UiAction_reg" method="post" theme="xhtml">
<s:checkbox name="married" label="婚否" />
<s:select list="#{101:'tom',202:'jerry',303:'kingkong'}" label="username"
listKey="key" listValue="value"/>
<s:select name="selectedId" list="userList" listKey="id" listValue="name" label="UserName"/>
<s:radio name="sex" list="#{0:'男',1:'女'}" label="性别" />
<s:checkboxlist name="hobby" list="#{0:'足球',1:'篮球',2:'乒乓球'}" label="爱好"/>
<s:doubleselect name="selectProvinceId" list="provinces" listKey="id" listValue="areaName"
doubleName="selectedCityId" doubleList="cities" doubleListKey="id" doubleListValue="areaName"
label="区域"/>
<s:submit />
</s:form>
</body>
</html>
关联选择 area 区域类
package cn.itcast.struts2.model;
import java.util.ArrayList;
import java.util.List;
/**
* 区域类
*/
public class Area {
private Integer id ;
private String areaName ;
private String areaNo ;
private int type ;
/* 省所属城市集合 */
private List<Area> cities = new ArrayList<Area>();
public Area(Integer id, String areaName) {
this.id = id;
this.areaName = areaName;
}
public Area(Integer id, String areaName, String areaNo) {
this.id = id;
this.areaName = areaName;
this.areaNo = areaNo;
}
public Area(Integer id, String areaName, String areaNo, int type) {
this.id = id;
this.areaName = areaName;
this.areaNo = areaNo;
this.type = type;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getAreaName() {
return areaName;
}
public void setAreaName(String areaName) {
this.areaName = areaName;
}
public String getAreaNo() {
return areaNo;
}
public void setAreaNo(String areaNo) {
this.areaNo = areaNo;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public List<Area> getCities() {
return cities;
}
public void setCities(List<Area> cities) {
this.cities = cities;
}
}
<s:doubleselect /> 产生的级联菜单是换行的， 可通过如下方式解决 s:doubleselect 换行的问题。
<style type="text/css">
.nobr br{display:none;}
</style>
在有s:doubleselect 的 s:form 表单上套上div
<div class="nobr">
<s:form> ...... </s:form>
</div>
http://blog.csdn.net/shangpusp/article/details/4956011
