struts2类型转换实现2（通过继承StrutsTypeConverter抽象类）

最新推荐文章于 2020-06-30 14:03:35 发布

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#struts2 #StrutsTypeConverter

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本文详细介绍了Struts2中两种类型转换方式，包括convert.jsp页面实现输入文本到对象的转换，以及convertResult.jsp页面展示转换结果。通过POJO类Point作为示例，展示了如何使用自定义转换器PointConverter实现字符串到对象的复杂属性转换。

二.第二种struts2类型转换方式实例
1.convert.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>类型转换</title>
  </head>
  <body>
    <form action="convert.action" method="post">
    	point:<input name="point" type="text">
              <input type="submit" value="submit">
    </form>
  </body>
</html>

2.convertResult.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>类型转换结果页面</title>
  </head>
  <body>
    	point:<s:property value="point"/>
  </body>
</html>

3.Point.java(POJO类)

package com.hitsoft.model;
public class Point {
	private int x;
	private int y;
	public int getX() {
		return x;
	}
	public void setX(int x) {
		this.x = x;
	}
	public int getY() {
		return y;
	}
	public void setY(int y) {
		this.y = y;
	}
	@Override
	public String toString() {
		String result = "x = " + x + " , y = " +y;
		return result;
	}

}

4.struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="struts2"  extends="struts-default">
	<action name="convert" class="com.hitsoft.action.ConvertAction">
		<result name="success">/convertResult.jsp</result>
	</action>
    </package>
</struts>

5.ConvertAction.java

package com.hitsoft.action;
import java.util.Date;
import com.hitsoft.model.Point;
import com.opensymphony.xwork2.ActionSupport;

public class ConvertAction extends ActionSupport{
	private Point point;

	public Point getPoint() {
		return point;
	}
	public void setPoint(Point point) {
		this.point = point;
	}

	public String execute() throws Exception{
		return "success";
	}
}

6.ConvertAction-conversion.properties(必须与ConvertAction类在同一级包下定义)


point=com.hitsoft.convert.PointConverter

7.PointConverter.java


package com.hitsoft.convert;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.hitsoft.model.Point;

public class PointConverter extends StrutsTypeConverter{

	@SuppressWarnings("unchecked")
	@Override
	public Object convertFromString(Map context, String[] values, Class toClass) {
		Point point = new Point();
		String value = values[0];
		String[] result = value.split(",");
		point.setX(Integer.parseInt(result[0]));
		point.setY(Integer.parseInt(result[1]));
		return point;
	}

	@SuppressWarnings("unchecked")
	@Override
	public String convertToString(Map context, Object o) {
		Point point = (Point) o;
		int x = point.getX();
		int y = point.getY();
		String result = "x: " + x + "y:" + y;
		return result;
	}

}