Strtus2（3）：struts2的类型转换
1，新建一个Point类，包含两个变量x,y。只有set,get方法
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;
}
}
2，新建input.jsp文件
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<body>
<!-- 1,用户输入合法的Point类型的数据后,根据struts.xml文件的配置，会跳转到PointAction.java中处理 -->
<!-- 2,PointAction在setPoint时发现在action目录下有一个PointAction-conversion.properties文件，
<!-- 此时Struts知道会到PointConverter类中去做类型转换，变成 Point类型 -->
<!-- 3,转换完成后，执行PointAction类中的execute转到output.jsp页面，output.jsp取PointAction页面的getPoint方法的返回值 -->
<!-- 4，在得到返回值前，需要先到PointConverter方法再做类型转换，变成String类型 -->
<!-- 5，如何确认哪个JavaBean对应哪个转换器？这是在xwork-conversion.properties中设置的 -->
<!-- 6，如果想给某个实例指定特定的转换器，就在同个包目录下，建立 类名+"-conversion.properties"文件，如Point2Action-conversion.properties -->
<s:form action="pointConvert">
<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></s:submit>
</s:form>
</body>
</html>
3，建立转换类
package com.test.convert;
import java.util.Map;
import ognl.DefaultTypeConverter;
import com.test.bean.Point;
public class PointConvert extends DefaultTypeConverter {
/**
* 根据toType的类型来判断是从客户端到服务器端，还是从服务器端到客户端
*/
public Object convertValue(Map context, Object value, Class toType) {
//从客户端到服务端
if (Point.class == toType) {
Point point = new Point();
String[] str = (String[]) value;
String[] paramString = str[0].split(",");
int x = Integer.parseInt(paramString[0]);
int y = Integer.parseInt(paramString[1]);
point.setX(x);
point.setY(y);
return point;
}
//从服务端到客户端
if (String.class == toType) {
Point point = (Point) value;
int x = point.getX();
int y = point.getY();
String resultString = "[x=" + x + ",y=" + y + "]";
return resultString;
}
return null;
}
}
4，建PointAction
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 date;
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 getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public String execute() throws Exception {
return SUCCESS;
}
}
5，建指定类型转换配置文件PointAction-conversion.properties，放在action目录下
point=com.test.convert.PointConvert
6，配置struts.xml文件
<action name="pointConvert" class="com.test.action.PointAction"> <result name="success">/output.jsp</result> <result name="input">/input.jsp</result> </action>