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.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();
}
}