Struts2（4）：Struts2类型转换2-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_9280/article/details/82067695

1，修改上一节的input.jsp文件

<s:form action="pointConvert">
    	<s:textfield name="point1" label="point1"></s:textfield>
    	<s:textfield name="point2" label="point2"></s:textfield>
    	<s:textfield name="point3" label="point3"></s:textfield>
    	<s:textfield name="age" label="age"></s:textfield>
    	<s:textfield name="username" label="username"></s:textfield>
    	<s:textfield name="date" label="birthday"></s:textfield>
    	<s:submit></s:submit>
    </s:form>

新建了point2,point3两个变量，如果照上一节的方法进行类型转换，需要在PointAction-conversion.properties文件中新建两个配置，即

point2=com.test.convert.PointAction
point3=com.test.convert.PointAction

如果有多个这样的变更，这样做就太繁琐。

2，使用xwork的方式进行类型转换，在src目录下新建一个文件：xwork-conversion.properties

#所有Point类型的实例都用PointConverter进行转换
com.test.bean.Point=com.test.converter.PointConverter2

这样就第1步中的方式简单很多，可以根据类型进行转换，而不需对每个变量都进行一次配置。

同时PointConvert.java类也要进行改造，需继承StrutsTypeConverter

package com.test.convert;

import java.util.Map;
import org.apache.struts2.util.StrutsTypeConverter;
import com.test.bean.Point;

public class PointConvert extends StrutsTypeConverter {

	public Object convertFromString(Map context, String[] values, Class toClass) {
		Point point = new Point();
		String[] paramValues = values[0].split(",");
		int x = Integer.parseInt(paramValues[0]);
		int y = Integer.parseInt(paramValues[1]);
		point.setX(x);
		point.setY(y);
		return point;
	}

	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;
	}
}

struts.xml文件还是上一节的配置，没有修改。

output.jsp文件修改为

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
  <body>
  	point1:<s:property value="point1"/><br>
  	point2:<s:property value="point2"/><br>
  	point3:<s:property value="point3"/><br>
  	age:<s:property value="age"/><br>
  	username:<s:property value="username"/><br>
  	date:<s:property value="date"/><br>
  </body>
</html>

3，如果要进行LIST类型转换，应该怎么做？先对input.jsp进行改造。有三个name为point的输入框。

<s:form action="pointConvert">
    	<s:textfield name="point" label="point1"></s:textfield>
    	<s:textfield name="point" label="point2"></s:textfield>
    	<s:textfield name="point" label="point3"></s:textfield>
    	<s:textfield name="age" label="age"></s:textfield>
    	<s:textfield name="username" label="username"></s:textfield>
    	<s:textfield name="date" label="birthday"></s:textfield>
    	<s:submit></s:submit>
    </s:form>

对应PointAction.java也进行相应的改变，有一个List类型的point变量，用于存放从客户端转来的3个Point

package com.test.action;

import java.util.Date;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
import com.test.bean.Point;

public class PointAction extends ActionSupport {
	private List<Point> point;
	private int age;
	private String username;
	private Date date;

	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public Date getDate() {
		return date;
	}
	public void setDate(Date date) {
		this.date = date;
	}
	
	public List<Point> getPoint() {
		return point;
	}
	public void setPoint(List<Point> point) {
		this.point = point;
	}
	public String execute() throws Exception {
		return SUCCESS;
	}
}

PointConvert也进行相应的改变

public class PointConvert extends StrutsTypeConverter {

	public Object convertFromString(Map context, String[] values, Class toClass) {
		List<Point> list = new ArrayList<Point>();
		for (String value : values) {
			Point point = new Point();
			String[] param = value.split(",");
			point.setX(Integer.parseInt(param[0]));
			point.setY(Integer.parseInt(param[1]));
			list.add(point);
		}
		return list;
	}

	public String convertToString(Map context, Object o) {
		List<Point> list = (List<Point>)o;
		StringBuilder sb = new StringBuilder();
		for(Point point: list){
			sb.append("x= ").append(point.getX()).append(" y=").append(point.getY());
		}
		return sb.toString();
	}
}