2008-02-27

Struts2内建类型转换器数据器使用简介

struts2 内建了类型转换器，可以方便的将我们在页面上输入的字符串数据转换成JavaBean中的Boolean,Float,Integer,Double,Long等数据类型，在无法转换成功时，还可以给出错误提示，非常方便

首先简历JavaBean:

 

package HelloWorld;

public class User {
    private String username;
      private Integer password;

      private String[] books;
      public String[] getBooks() {
            return books;
        }
        public void setBooks(String[] books) {
            this.books = books;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public Integer getPassword() {
            return password;
        }
        public void setPassword(Integer password) {
            this.password = password;
        }

    
}

 

编写Action,需要继承ActionSupport,在action中有两个变量，一个是User类，一个是birth属性

我们定义birth属性和user类中的password属性都必须是Integer类型

 

package HelloWorld;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
 

private String tip;
private User user;
private Integer birth;


public Integer getBirth() {
    return birth;
}

public void setBirth(Integer birth) {
    this.birth = birth;
}

public String execute() throws Exception{
    System.out.println(this.getUser().getUsername());
    System.out.println(this.getUser().getPassword());
          return SUCCESS;
    
  }

public User getUser() {
    return user;
}

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

public String getTip() {
    return tip;
}
public void setTip(String tip) {
    this.tip = tip;
}


  
}

 

web.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <filter>
      <filter-name>struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
    </filter>
    <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping>


</web-app>

 

struts.xml (WEB-INF/classes下)

 

<?xml version="1.0" encoding="GBK" ?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <package name="struts" extends="struts-default">
       <action name="Login" class="HelloWorld.LoginAction">
         <result name="input">/helloworld/index.jsp</result>
         <result name="success">/helloworld/welcome.jsp</result>
         
         <result name="error">/helloworld/error.jsp</result>
       </action>
    </package>
</struts>

 

struts.properties(WEB-INF/classes下)

struts.custom.i18n.resources=messageResource

 

信息录入页面：

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
    <title></title>
  </head>
  <body>     
   <div style="color:red">
    <s:fielderror />
</div>
     <s:form action="Login">
       <s:textfield name="user.username" key="username"></s:textfield>

       <s:textfield name="user.password" key="password"></s:textfield>
 <s:textfield name="birth" key="password"></s:textfield>
       <s:submit value="login"></s:submit>
    </s:form>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
  </body>
</html>

信息展示页面：

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<%@ page isELIgnored="false" %>
   
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
  <head>
    <title></title>
  </head>
  <body>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
   <body>
        转换成功!<br>
  用户1的用户名为：<s:property value="user.username"/><br>
  用户1的密码为：<s:property value="user.password"/><br>
  
    </body>
</html>

 

 

我们在资源文件中加入：

xwork.default.invalid.fieldvalue={0}类型转换错误，运行index.jsp.,在三个输入框中都输入admin,则会出现以下提示：


user.password字段类型转换失败
birth字段类型转换失败

 

在资源文件中定义的是全局转换错误提示的内容，如果想对具体Action中的字段进行提示，则编写ActionName.properties,本文中对应的就是LoginAction.properties,放在和Action同一个目录下，内容格式如下：invalid.fieldvalue.birth （其中birth为action中属性名）

本文LoginAction.properties内容为：invalid.fieldvalue.birth=生日必须为数字

再次运行index.jsp.结果如下：

user.password字段类型转换失败
生日必须位数字

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