20.struts2的数据填充和类型转换.md

时间：2023-03-09 09:08:50
20.struts2的数据填充和类型转换.md

目录

1. struts2的自动填充

当jsp和Action类中对象名称一致时候，拦截器会自动拦截填充。

拦截器：

Demo:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

    <form action="${pageContext.request.contextPath}/user_register.action" method="post">

        用户名:<input type="text" name="name"><br/>

        年     龄:<input type="text" name="age"><br/>

        生     日:<input type="text" name="birth"><br/>

        <input type="submit" value="注册">

    </form>

  </body>

</html>
package per.liyue.struts2_datafomat;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

	/*

	* 注意：一定要提供Setter方法

	*/

	private String name;

	private int age;

	private Date birth;

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		this.age = age;

	}

	public Date getBirth() {

		return birth;

	}

	public void setBirth(Date birth) {

		this.birth = birth;

	}

	public String register(){

		System.out.println(name);

		System.out.println(age);

		System.out.println(birth);

		return "register";

	}

}


<?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>

    <package name="data_conversion"  extends="struts-default" >

        <!-- 使用通配符实现 -->

        <action name="user_*" class="per.liyue.struts2_datafomat.UserAction" method="{1}">

            <result name="{1}">/user.jsp</result>

        </action>

    </package>

</struts>
<?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>

    <!-- 在总配置文件中引入其他配置文件 -->

    <include file="per/liyue/code/struts2demo/config_HelloStruts2.xml"></include>  

    <include file="per/liyue/code/struts2_data/data.xml"></include>   

    <include file="per/liyue/struts2_datafomat/data_conversion.xml"></include>

</struts>

在浏览器地址栏输入：

http://localhost.:8080/StrutsDemo1/user_register.action

填写后提交，得到输入内容

2. struts2的对象填充

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

    <form action="${pageContext.request.contextPath}/user_register.action" method="post">

        用户名:<input type="text" name="user.name"><br/>

        年     龄:<input type="text" name="user.age"><br/>

        生     日:<input type="text" name="user.birth"><br/>

        <input type="submit" value="注册">

    </form>

  </body>

</html>
package per.liyue.struts2_datafomat;

import java.util.Date;

public class User {

    /*

     * 注意：一定要提供Setter方法

     */

    private String name;

    private int age;

    private Date birth;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public Date getBirth() {

        return birth;

    }

    public void setBirth(Date birth) {

        this.birth = birth;

    }

}
package per.liyue.struts2_datafomat;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

	/*

	* 注意：提供setter和getter方法

	*/

	private User user;

	public User getUser() {

		return user;

	}

	public void setUser(User user) {

		this.user = user;

	}

	public String register(){

		System.out.println(user.getName());

		System.out.println(user.getAge());

		System.out.println(user.getBirth());

		return "register";

	}

}

其他保持不变，浏览器地址栏输入：

http://localhost.:8080/StrutsDemo1/user_register.action

填写后提交，得到输入内容.

3. struts2的类型转换器

对于一些没有按照指定格式输入的内容，那么可以用自定义的类型转换器来处理：

3.1 类继承关系

---TypeConverter

------DefaultTypeConverter

---------StrutsTypeConverter

3.2 局部转换器

步骤：

  1. 编写转换器类：继承转换类

  2. 在包下建立属性文件,文件名称严格按照格式

  • Action名称-conversion.properties
  • 然后配置:需要转换的字段名=自定义转换器类的权限名称

    例如birthday=cn.itcast.convertor.DateTypeConvertor

3.3 全局转换器

步骤：

  1. 继承转换类，实现抽象方法
  1. 在包下建立属性文件，严格按照格式
  • xwork-conversion.properties

3.4 注意

二者可以同时共用，但是同时出现时候优先局部转换器

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