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>
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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>
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