Structs2笔记③--局部类型转换案例

Structs2的类型转换—局部类型转换

Ognl强大的表达式语言，在导入项目的时候我们导入了ognl.jar包，内有TypeConverter类，struct主要依赖于他进行类型转换。

例子

input.jsp

<%@ taglib prefix="s" uri="/struts-tags"%>

<h3><font color="red">使用都逗号将点的两个坐标分隔开</font></h3>

<s:form action="/new/pointConverter">

<s:textfield name="point" label="point"></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 loabel="submit"></s:submit>

</s:form>

对应的坐标实体

Point.Java

package com.test.bean;

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;

}

自定义的类型转换类PointConverter，继承DefaultTypeConverter，重写convertValue

方法

package com.test.convertr;

import java.lang.reflect.Member;

import java.util.Map;

import com.test.bean.Point;

import ognl.DefaultTypeConverter;

/**

* 自定义的转换类

* @author Administrator

public class PointConverter extends DefaultTypeConverter {

@Override

public Object convertValue(Map context, Object value, Class toType) {

if (Point.class==toType) {

Point point=new Point();

String[] str=(String[])value;

String[] paramValues=str[0].split(",");

int x=Integer.parseInt(paramValues[0]);

int y=Integer.parseInt(paramValues[1]);

point.setX(x);

point.setY(y);

return point;

}

if (String.class==toType) {

Point point=(Point)value;

int x=point.getX();

int y=point.getY();

String result="[x="+x+",y="+y+"]";

return result;

}

return null;

}

写与表单相对应的PointAction类

package com.test.action;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

import com.test.bean.Point;

public class PointAction extends ActionSupport{

private Point point;

private int age;

private String username ;

private Date birthday;

public Point getPoint() {

return point;

}

public void setPoint(Point point) {

this.point = point;

}

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 getBirthday() {

return birthday;

}

public void setBrithday(Date birthday) {

this.birthday = birthday;

}

@Override

public String execute() throws Exception {

return SUCCESS;

}

告诉struct 我的Point属性使用我自己写的转换类转换。

在Action目录下建立PointAction-conversion.properties文件

point=com.test.convertr.PointConverter

配置structs.xml

<result name="success">/output.jsp</result>

</action>

建立output.jsp

<%@ taglib prefix="s" uri="/struts-tags"%>

point:<s:property value="point"/><br>

age:<s:property value="age"/><br>

username:<s:property value="username"/><br>

date :<s:property value="date"/>