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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：类型转换中的错误处理

<?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>

#改变默认的类型转换失败后的提示信息
xwork.default.invalid.fieldvalue={0}字段类型转换失败！

#u6539u53d8u9ed8u8ba4u7684u7c7bu578bu8f6cu6362u5931u8d25u540eu7684u63d0u793au4fe1u606f
xwork.default.invalid.fieldvalue={0}u5b57u6bb5u7c7bu578bu8f6cu6362u5931u8d25uff01

<?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>
    <!-- 配置国际化资源文件 -->
    <constant name="struts.custom.i18n.resources" value="mess"/>
    <package name="lee" extends="struts-default">
        <action name="login" class="org.crazyit.app.action.LoginAction">
            <!-- 配置名为input的逻辑视图，当转换失败后转入该逻辑视图 -->
            <result name="input">/WEB-INF/content/input.jsp</result>
            <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), 2001-2016, 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>类型转换的错误处理</title>
</head>
<body>
<s:fielderror/>
<h3>类型转换的错误处理</h3>
<p><b>输入的用户名、密码以逗号（,）隔开</b></p>
<s:form action="login">
    <s:textfield name="user" label="用户"/>
    <tr>
        <td colspan="2"><s:submit value="转换" theme="simple"/>
        <s:reset value="重填" theme="simple"/></td>
    </tr>
</s:form>
</body>
</html>

<%--
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), 2001-2016, 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>转换结果</title>
</head>
<body>
    <s:actionmessage/>
    用户名为:<s:property value="user.name"/><br/>
    密码为：<s:property value="user.pass"/><br/>
</body>
</html>

#改变默认的类型转换失败后的提示信息
xwork.default.invalid.fieldvalue={0}字段类型转换失败！

#u6539u53d8u9ed8u8ba4u7684u7c7bu578bu8f6cu6362u5931u8d25u540eu7684u63d0u793au4fe1u606f
xwork.default.invalid.fieldvalue={0}u5b57u6bb5u7c7bu578bu8f6cu6362u5931u8d25uff01

<?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>
    <!-- 配置国际化资源文件 -->
    <constant name="struts.custom.i18n.resources" value="mess"/>
    <package name="lee" extends="struts-default">
        <action name="login" class="org.crazyit.app.action.LoginAction">
            <!-- 配置名为input的逻辑视图，当转换失败后转入该逻辑视图 -->
            <result name="input">/WEB-INF/content/input.jsp</result>
            <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.ActionSupport;

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 LoginAction
    extends ActionSupport
{
    private User user;

    // user的setter和getter方法
    public void setUser(User user)
    {
        this.user = user;
    }
    public User getUser()
    {
        return this.user;
    }

    public String execute() throws Exception
    {
        if (getUser().getName().equals("crazyit.org")
            && getUser().getPass().equals("leegang") )
        {
            addActionMessage("登录成功！");
            return SUCCESS;
        }
        addActionMessage("登录失败！！");
        return ERROR;
    }
}

#指定user属性需要使用UserConverter类来完成类型转换
user=org.crazyit.app.converter.UserConverter

package org.crazyit.app.converter;

import java.util.Map;
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
{
    // 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() + ">";
    }
}

package org.crazyit.app.domain;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, 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 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;
    }

}

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原文地址：https://www.cnblogs.com/tszr/p/12364851.html