struts 自动填充和访问ValueStack-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_8208/article/details/82650101

add.jsp：
  
<body>
    <s:form action="AddUserAction">
  		<s:textfield name="user.userName" label="Your name" />
  		<s:textfield name="user.address.address" label="Your address" />
  		<s:textfield name="user.address.zipCode" label="Your zipCode" />
  		<s:textfield name="user.address.phone" label="Your phone" />
  		<s:textfield name="array" label="不使用下标的数组" />
  		<s:textfield name="array" label="不使用下标的数组" />
  		<s:textfield name="initArray[0]" label="使用下标的数组" />
  		<s:textfield name="initArray[1]" label="使用下标的数组" />
  		<s:textfield name="list[0]" label="List" />
  		<s:textfield name="list[1]" label="List" />
  		<s:textfield name="map['user1'].userName" label="Map" />
  		<s:textfield name="map.user2.userName" label="Map" />
  		<s:submit/>
  	</s:form>
  </body>

success.jsp:

  <body>
  	<h4>User: <s:property value="user.userName" /> add success.</h4>
    <h4>Address:<s:property value="user.address.address" /></h4>
    <h4>zipCode:<s:property value="user.address.zipCode" /></h4>
    <h4>phone  :<s:property value="user.address.phone" /></h4>
    <!-- set 将对象设置为ActionContext中的属性映射，默认作用域是Action -->
    <s:set name="username" scope="session" value="user.userName" />
    <h4>Hello <s:property value="#session['username']" /></h4>
    <!-- push 将ActionContext中的对象放入ValueStack顶端，方便标签内访问。 -->
    <s:push value="user">
    <h4>Show userName(<s:property value="userName" />) by push user in ValueStack.</h4>
    </s:push>
    <!-- bean 创建一个类的实例，默认放置在ValueStack中，标签外访问需要设置var为实例指定一个引用，该引用会作为命名参数存在于ActionContext -->
    <s:bean name="com.jaeson.hibernatestudy.bean.User" var="bean">
    	<s:param name="userName">jaesonchen</s:param>
    	<h4>User bean for User.getUserName()=<s:property value="getUserName()" /></h4>
    </s:bean>
    
    <s:if test="#bean.userName == 'jaesonchen1'">
    	<h4>if show #bean.userName=<s:property value="#bean.userName" /></h4>
    </s:if>
    <s:elseif test="user.address.zipCode == 100086">
    	<h4>elseif show user.zipCode=<s:property value="user.address.zipCode" /></h4>
    </s:elseif>
    <s:else>
    	<h4>else show nothing</h4>
    </s:else>
    
    <!-- iterator 遍历Collection Map Enum Iterator Array，支持在ActionContect中定义一个保存遍历状态的变量 -->
    <s:iterator value="array" status="itStatus">
    	<li>
    	<s:property value="#itStatus.count" />
    	<s:property value="array[#itStatus.index]" />
    </s:iterator>
    <s:iterator value="list" status="itStatus">
    	<li>
    	<s:property value="#itStatus.count" />
    	<s:property />
    </s:iterator>
    <s:iterator value="map" status="itStatus">
    	<li>
    	<s:property value="key" />
    	<s:property value="value.userName" />
    </s:iterator>
    <!-- Map遍历的类型为Entry(key, value)，默认情况下listKey指向key，listValue指向value -->
    <s:select name="selectList" list="{'chenzq','jaeson','jaesonchen'}" label="select a name"/>
    <s:select name="selectList" list="list" label="select a num"/>
    <s:select name="selectMap" list="map" listValue="value.userName" label="select a username"/>
    <s:radio name="radioList" list="{'chenzq','jaeson','jaesonchen'}" label="radio a name" />
  </body>

import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.context.annotation.Scope;

import com.opensymphony.xwork2.ActionSupport;
import com.jaeson.hibernatestudy.bean.User;
import com.jaeson.springstudy.service.CommonService;

@SuppressWarnings("all")
@Scope("prototype")
@Controller("userAction")
public class UserAction extends ActionSupport {

	@Override
	public String execute() {
		
		this.getCommonService().saveOrUpdate(this.getUser());
		//throw new RuntimeException("throw in UserAction");
		return SUCCESS;
	}
	
	@Override
	public void validate() {
		
		if (this.getUser().getUserName().length() == 0) {
			this.addFieldError("user.userName", "userName is required.");
		}
	}
	/**
	 * 使用相同名字array提交时，不需要初始化数组。
	 * 使用initArray[0]提交时，必须初始化数组，否则初始化错误 ognl.OgnlException: target is null for setProperty。
	 * List Map等集合类型时，两种提交方式都不能初始化集合。
	 * 在类型转换错误需要返回input时，使用无下标提交的集合每一个输入框都会显示全部的集合内容，最佳实践使用集合下标。
	 */
	private String[] array;
	private double[] initArray = new double[10];
	private List<Integer> list;
	private Map<String, User> map;
	private User user;
	@Resource(name = "commonService")
	private CommonService commonService;
	public User getUser() {
		return this.user;
	}

	public void setUser(User user) {
		this.user = user;
	}
	
	public String[] getArray() {
		return array;
	}

	public void setArray(String[] array) {
		this.array = array;
	}

	public double[] getInitArray() {
		return initArray;
	}

	public void setInitArray(double[] initArray) {
		this.initArray = initArray;
	}

	public List<Integer> getList() {
		return list;
	}

	public void setList(List<Integer> list) {
		this.list = list;
	}	

	public Map<String, User> getMap() {
		return map;
	}

	public void setMap(Map<String, User> map) {
		this.map = map;
	}

	public CommonService getCommonService() {
		return this.commonService;
	}

	public void setCommonService(CommonService commonService) {
		this.commonService = commonService;
	}
	
}

struts.xml:

<action name="AddUserAction" class="userAction">
   <result name="success">/success.jsp</result>
   <result name="input">/add.jsp</result>
  </action>