Struts2（4）：Struts2类型转换2
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.PointActionpoint3=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.split(",");int x = Integer.parseInt(paramValues);int y = Integer.parseInt(paramValues);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 = "";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));point.setY(Integer.parseInt(param));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();}}
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