吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：Struts2的类型转换：处理Set集合

<?xml version="1.0" encoding="GBK"?>
<project name="struts" basedir="." default="">
    <property name="dist" value="classes"/>
    <property name="src" value="src"/>
    
    <path id="classpath">
        <fileset dir="lib">
            <include name="*.jar"/>
        </fileset>
        <pathelement path="${dist}"/>
    </path>

    <target name="compile" description="Compile all source code">
        <delete dir="${dist}"/>
        <mkdir dir="${dist}"/>
        <copy todir="${dist}">
            <fileset dir="${src}">
                <exclude name="**/*.java"/>
            </fileset>        
        </copy>
        <javac destdir="classes" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${src}"/>
            <classpath refid="classpath"/>
        </javac>
    </target>

</project>
<?xml version="1.0" encoding="GBK"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
    <!-- 定义Struts 2的核心Filter -->
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <!-- 让Struts 2的核心Filter拦截所有请求 -->
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <package name="lee" extends="struts-default">

        <action name="login" class="org.crazyit.app.action.LoginAction">
            <result>/WEB-INF/content/welcome.jsp</result>
            <result name="error">/WEB-INF/content/welcome.jsp</result>
        </action>
        <action name="*">
            <result>/WEB-INF/content/{1}.jsp</result>        
        </action>
    </package>
</struts>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2012, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Set属性的类型转换</title>
</head>
<body>
<h3>Set属性的类型转换</h3>
<s:form action="login">
    <s:textfield name="users" label="第一个用户信息"/>
    <s:textfield name="users" label="第二个用户信息"/>
    <s:textfield name="birth" label="用户生日"/>
    <tr>
        <td colspan="2"><s:submit value="转换" theme="simple"/>
        <s:reset value="重填" theme="simple"/></td>
    </tr>
</s:form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
    <title>转换结果</title>
</head>
<body>
    <s:actionmessage/>
    <s:property value="users"/>
<!-- 访问users集合属性里索引属性值为crazyit.org的元素的name属性-->
用户crazyit.org的用户名为：<s:property value="users('crazyit.org').name"/><br/>
<!-- 访问users集合属性里索引属性值为crazyit.org的元素的pass属性-->
用户crazyit.org的密码为：<s:property value="users('crazyit.org').pass"/><br/>
<!-- 访问users集合属性里索引属性值为fkit的元素的name属性-->
用户fkit的用户名为：<s:property value="users('fkit').name"/><br/>
<!-- 访问users集合属性里索引属性值为fkit的元素的pass属性-->
用户fkit的密码为：<s:property value="users('fkit').pass"/><br/>
生日为：<s:property value="birth"/><br/>
</body>
</html>
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <package name="lee" extends="struts-default">

        <action name="login" class="org.crazyit.app.action.LoginAction">
            <result>/WEB-INF/content/welcome.jsp</result>
            <result name="error">/WEB-INF/content/welcome.jsp</result>
        </action>
        <action name="*">
            <result>/WEB-INF/content/{1}.jsp</result>        
        </action>
    </package>
</struts>
package org.crazyit.app.action;

import com.opensymphony.xwork2.*;
import java.util.Date;
import java.util.Set;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2012, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class LoginAction extends ActionSupport
{
    private Set users;
    private Date birth;
    // users的setter和getter方法
    public void setUsers(Set users)
    {
        this.users = users;
    }
    public Set getUsers()
    {
        return this.users;
    }
    // birth的setter和getter方法
    public void setBirth(Date birth)
    {
        this.birth = birth;
    }
    public Date getBirth()
    {
        return this.birth;
    }
    // 没有提供execute()方法,
    // 将直接使用ActionSupport的execute()方法
}
#指定users属性的类型转换器是UserConverter
users= org.crazyit.app.converter.UserConverter
# 指定users集合属性里集合元素的索引属性是name
KeyProperty_users=name
package org.crazyit.app.converter;

import java.util.*;
import org.apache.struts2.util.StrutsTypeConverter;

import org.crazyit.app.domain.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author Yeeku.H.Lee kongyeeku@163.com
 * @version 1.0
 */
public class UserConverter extends StrutsTypeConverter
{
    public Object convertFromString(Map context
        , String[] values, Class toClass)
    {
        Set result = new HashSet();
        for (int i = 0; i < values.length ; i++ )
        {
            // 创建一个User实例
            User user = new User();
            // 只处理请求参数数组第一个数组元素，
            // 并将该字符串以英文逗号分割成两个字符串
            String[] userValues = values[i].split(",");
            // 为User实例的属性赋值
            user.setName(userValues[0]);
            user.setPass(userValues[1]);
            // 将User实例添加到Set集合中
            result.add(user);
        }
        return result;
    }
    public String convertToString(Map context, Object o)
    {
        // 如果待转换对象的类型是Set
        if (o.getClass() == Set.class)
        {
            Set users = (Set)o;
            String result = "[";
            for (Object obj : users )
            {
                User user = (User)obj;
                result += "<" + user.getName()
                    + "," + user.getPass() + ">";
            }
            return result + "]";
        }
        else
        {
            return "";
        }
    }
}
package org.crazyit.app.domain;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2012, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class User
{
    private String name;
    private String pass;

    // name的setter和getter方法
    public void setName(String name)
    {
        this.name = name;
    }
    public String getName()
    {
        return this.name;
    }

    // pass的setter和getter方法
    public void setPass(String pass)
    {
        this.pass = pass;
    }
    public String getPass()
    {
        return this.pass;
    }

    public boolean equals(Object obj)
    {
        // 如果待比较的两个对象是同一个对象，直接返回true
        if(this == obj)
        {
            return true;
        }
        // 只有当obj是User对象
        if (obj != null && obj.getClass() == User.class)
        {
            User user = (User)obj;
            // 两个对象的name属性相等即认为二者相等
            return this.getName().equals(user.getName());
        }
        return false;
    }
    // 根据name计算hashCode
    public int hashCode()
    {
        return name.hashCode();
    }
}
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原文地址：https://www.cnblogs.com/tszr/p/12364841.html