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struts2之类型转换

struts2类型转换 
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struts2有内建的类型转换器，boolean和Boolean，char和Character，int和Integer，long和Long，float和Float，double和Double，Date，字符串类型数组，String类型集合。

基于OGNL的类型转换。 
package com.randy.com.entity;

public class User {

	private String username;
	private String password;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

}

struts2.xml 
<action name="loginUser" class="com.randy.com.LoginUserAction">
	<result name="success">/succ.jsp</result>	
</action>

package com.randy.com;

import com.opensymphony.xwork2.ActionSupport;
import com.randy.com.entity.User;

public class LoginUserAction extends ActionSupport {

	private User user;

	public String execute() {
		System.out.println(user.getUsername() + ":" + user.getPassword());
		return SUCCESS;
	}
	
	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

}

<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>user login</title>
</head>
<body>
	<s:form action="loginUser.action">
		<s:textfield name="user.username" label="name"></s:textfield>
		<s:password name="user.password" label="password"></s:password>
		<s:submit value="submitttt"></s:submit>
	</s:form>
</body>
</html>

这样就能自动组装User对象了。
还能对Map对象进行自动组装。 
<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:form action="loginMap.action">
	<s:textfield name="users['one'].username"></s:textfield>
	<s:password name="users['one'].password"></s:password>
	<s:textfield name="users['me'].username"></s:textfield>
	<s:password name="users['me'].password"></s:password>
	<s:submit value="submit"></s:submit>
</s:form>
</body>
</html>

Action： 
package com.randy.action;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import com.opensymphony.xwork2.ActionSupport;
import com.randy.entity.User;

public class LoginMapAction extends ActionSupport {

	private static final long serialVersionUID = 9143681290982374696L;
	private Map<String, User> users;

	public String execute() {
		System.out.println(users.size());
		Set<String> keySet = users.keySet();
		Iterator<String> iterator = keySet.iterator();
		while (iterator.hasNext()) {
			String key = iterator.next();
			System.out.println(key + ":" + users.get(key).getUsername() + "_"
					+ users.get(key).getPassword());
		}
		return SUCCESS;
	}

	public Map<String, User> getUsers() {
		return users;
	}

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

}

<s:text name="succTip">
	<s:param>${users.get('me').username}</s:param>
</s:text>

对于List类型的话用索引即可，如<s:textfield name="users[0].username"></s:textfield>
若不使用范型，则要配置一个资源文件，文件名命名规则：ActionName-conversion.properties，并将此文件与action类文件放在同一个包下。例如：LoginMapAction-conversion.properties，内容是：Key_users=java.lang.String
Element_users=com.randy.action.User


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