---

layout: post
title: struts2标签
subtitle: struts2标签
date: 2018-06-03
author: ZL
header-img: img/20180603.jpg
catalog: true
tags:
- struts标签

---

标签结构

image

控制标签

s:iterator

s:iterator遍历

list数据准备

@Override
public String execute() throws Exception {
  List<String> list = new ArrayList<String>();
  list.add("aaa");
  list.add("bbb");
  list.add("ccc");
  list.add("ddd");
  
  ActionContext.getContext().put("list", list);
  this.addActionError("error!!!!");
  return SUCCESS;
}

iterator遍历list

<s:iterator value="#list">
  <s:property/>
</s:iterator>
<br>
<s:iterator value="#list" var="name">
  <s:property value="#name"/>
</s:iterator>
<br>

效果

aaa bbb ccc ddd 
aaa bbb ccc ddd 

s:iterator计数

<s:iterator begin="1" end="100" step="1">
  <s:property/>
</s:iterator>
<br>

效果

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 

if,elseif,else

<s:if test="#list.size() == 4">
  list.size = 4;
</s:if>
<s:elseif test="#list.size() == 3">
  list.size = 3;
</s:elseif>
<s:else>
  list 不3不4
</s:else>

效果

list.size = 4; 

数据标签

s:property

结合OGNL取数据

<s:property value="#list.size()"/>

效果

4 

UI标签

表单标签

<!-- struts2表单标签 -->
<!-- 好处1: 内置了一套样式.  -->
<!-- 好处2: 自动回显,根据栈中的属性  -->
<!-- theme:指定表单的主题
    xhtml:默认
    simple:没有主题
 -->
<s:form action="Demo3Action" namespace="/" theme="xhtml" >
  <s:textfield name="name" label="用户名"  ></s:textfield>
  <s:password name="password" label="密码" ></s:password>
  <s:radio list="{'男','女'}" name="gender" label="性别" ></s:radio>
  <s:radio list="#{1:'男',0:'女'}" name="gender" label="性别" ></s:radio>
  <s:checkboxlist list="#{2:'抽烟',1:'喝酒',0:'烫头'}" name="habits" label="爱好" ></s:checkboxlist>
  <s:select list="#{2:'大专',1:'本科',0:'硕士'}" headerKey="" headerValue="---请选择---" name="edu" label="学历" >
  </s:select>
  <s:file name="photo" label="近照" ></s:file>
  <s:textarea name="desc" label="个人简介" ></s:textarea>
  <s:submit value="提交" ></s:submit>
</s:form>

效果

image

非表单标签s:actionerror

在Action中this.addActionError("");

@Override
public String execute() throws Exception {
  List<String> list = new ArrayList<String>();
  list.add("aaa");
  list.add("bbb");
  list.add("ccc");
  list.add("ddd");
  
  ActionContext.getContext().put("list", list);
  this.addActionError("error!!!!");
  return SUCCESS;
}

在jsp中<s:actionerror/>即可

<s:actionerror/>

在网页上

image