Struts2处理集合属性的转换错误

Dear 丶 2021-07-24 23:22 400阅读 0赞

**一 视图**

1 input.jsp

<%@ 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>类型转换的错误处理</title>
        <s:head/>
    </head>
    <body>
    <s:fielderror />
    <h3>类型转换的错误处理</h3>
    <s:form action="login">
        <s:iterator value="{0, 1, 2}" status="stat">
            
            <s:textfield name="users"
                label="第%{#stat.index}个用户信息"/>
        </s:iterator>
        <tr>
            <td colspan="2"><s:submit value="转换" theme="simple"/>
            <s:reset value="重填" theme="simple"/></td>
        </tr>
    </s:form>
    </body>
    </html>

2 ognlinput.jsp

<%@ 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>类型转换的错误处理</title>
        <s:head/>
    </head>
    <body>
    <s:fielderror />
    <h3>类型转换的错误处理</h3>
    <s:form action="login">
        <s:iterator value="{0, 1, 2}" status="stat">
            
            <s:textfield name="users[%{#stat.index}]"
                label="第%{#stat.index}个用户信息"/>
        </s:iterator>
        <tr>
            <td colspan="2"><s:submit value="转换" theme="simple"/>
            <s:reset value="重填" theme="simple"/></td>
        </tr>
    </s:form>
    </body>
    </html>

3 welcome.jsp

<%@ 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>转换结果</title>
    </head>
    <body>
        转换结果!<br/>
        <s:iterator value="users" status="status">
            用户<s:property value="%{#status.index}"/>的用户名：<s:property value="name"/><br/>
            用户<s:property value="%{#status.index}"/>的密码：<s:property value="pass"/><br/>
        </s:iterator>
    </body>
    </html>

**二 配置文件**

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
        
    <struts>
    
        <constant name="struts.custom.i18n.resources" value="mess"/>
        <constant name="struts.i18n.encoding" value="GBK"/>
    
        <package name="conversion" 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>
                <result name="input">/WEB-INF/content/ognlInput.jsp</result>
            </action>
            <action name="*">
                <result>/WEB-INF/content/{1}.jsp</result>    
            </action>        
        </package>
    </struts>

**三 mess.properties**

xwork.default.invalid.fieldvalue={0}字段类型转换失败！

**四 全局转换器配置文件**

org.crazyit.app.domain.User=org.crazyit.app.converter.UserConverter

**五 action**

package org.crazyit.app.action;
    
    import com.opensymphony.xwork2.Action;
    import java.util.Date;
    import java.util.List;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    import org.crazyit.app.domain.*;
    
    public class LoginAction extends ActionSupport
    {
        private List<User> users;
        // users的setter和getter方法
        public void setUsers(List<User> users)
        {
            this.users = users;
        }
        public List<User> getUsers()
        {
            return users;
        }
    }

**六 转换器**

package org.crazyit.app.converter;
    
    import java.util.Map;
    import org.apache.struts2.util.*;
    
    import org.crazyit.app.domain.*;
    
    public class UserConverter extends StrutsTypeConverter
    {
        // 实现将字符串类型转换成复合类型的方法
        public Object convertFromString(Map context
            , String[] values , Class toClass)
        {
            // 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[0].split(",");
            // 为User实例赋值
            user.setName(userValues[0]);
            user.setPass(userValues[1]);
            // 返回转换来的User实例
            return user;
        }
        // 实现将复合类型转换成字符串类型的方法
        public String convertToString(Map context, Object o)
        {
            // 将需要转换的值强制类型转换为User实例
            User user = (User) o;
            return "<" + user.getName() + ","
                + user.getPass() + ">";
        }
    }

**七 领域模型**

package org.crazyit.app.domain;
    
    
    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;
        }
    }

**八 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 4][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 5][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/eef3925d2ff54ac0b5a7d959a67d2b1c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/23f652532b424875ae100276deb5322a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/9c29dd7d6698475bbf79cf46b000f17d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3]: /images/20210724/d2969c30c4424a52b991062d3b70b97b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 4]: /images/20210724/fa8ad751c19a424ead59d1e191745d22.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 5]: /images/20210724/e5cc63acbca5485c8bcf732213f320ec.png