struts2 s:select 标签
1.静态生成 [html] view plain copy
<s:select name="user.sex" list="#{'0':'男','1':'女'}" label="性别" headerKey="" headerValue="请选择性别"></s:select>
注解：这里从页面来静态（也就是在页面中写死啦）构造下拉选项，关键点是list="#{'0':'男','1':'女'}" 通过它实现的select的两个option 。headerKey指定缺省的选项"key",headerValue指定缺省的选项"value"。
2.设置下拉框数据源
<% java.util.HashMap map = new java.util.LinkedHashMap();
map.put(1, "aaa");
map.put(2, "bbb");
map.put(3, "ccc");
request.setAttribute("map", map);
request.setAttribute("aa", "2");
%>
<s:select list="#request.map"
label="abc" listKey="key" listValue="value" value="#request.aa" headerKey="0" headerValue="aabb">
</s:select>
value的值设置为了2，所以初始化下拉框时，会自动选择key值为2的选项
3.action传递list过来在页面展示
要展示的list里的对象Program：
public class Program implements Serializable{
private int programid;
private String programName;
public int getProgramid() {
return programid;
}
public void setProgramid(int programid) {
this.programid = programid;
}
public String getProgramName() {
return programName;
}
public void setProgramName(String programName) {
this.programName = programName;
}
}
获取list的action：
xxxAction extends extends ActionSupport {
private List<Program> programs ;//list集合
public List<Program> getPrograms() {
return programs;
}
public void setPrograms(List<Program> programs) {
this.programs = programs;
}
}
jsp显示的页面：
<s:select list="programs " listValue="programName " listKey="programid " name="program" id="program" headerKey="0l" headerValue="" > </s:select>
listKey说明下拉框的key值对应 programid字段，listValue说明下拉框的显示部分对应programName字段
