struts2局部類型轉換
需求為：在頁面的文本框輸入一個x、y坐標，之間用","隔開，Action中有一個Point類型的屬性，Point類里面有兩個字段，分別是x，y，int型，要求當頁面提交時將文本框中的字符串轉換成Point對象，當Action返回到頁面時將Point轉換成字符串顯示
1、首先做一個jsp用于輸入和提交：point.jsp
<s:form action="Converter">
<s:textfield name="point" label="Point"></s:textfield>
<s:textfield name="point.x" label="Point.X"></s:textfield>
<s:textfield name="point.y" label="Point.Y"></s:textfield>
<s:submit label="submit"></s:submit>
</s:form>
2、再建一個用于顯示的jsp-converter.jsp
<body>
<s:property value="point"/><br>
<s:property value="point.x"/><br>
<s:property value="point.y"/><br>
</body>
3、Action類 ConverterAction
public class ConverterAction extends ActionSupport{
private Point point;
public Point getPoint() {
return point;
}
public void setPoint(Point point) {
this.point = point;
}
public String execute()throws Exception {
return "success";
}
}
4、struts.xml
<action name="Converter"
class="com.test.struts2.action.ConverterAction">
<result name="success">/converter.jsp</result>
<result name="input">/point.jsp</result>
</action>
5、轉換類 ConverterPoint
public class ConverterPoint extends DefaultTypeConverter {
@Override
public Object convertValue(Map context, Object value, Class toType) {
if(Point.class == toType){
String[] params = (String[])value;
params = params[0].split(",");
Point point = new Point();
point.setX(Integer.parseInt(params[0]));
point.setY(Integer.parseInt(params[1]));
return point;
}else if(String.class == toType){
Point point = (Point)value;
return "x=" + point.getX() + ",y=" + point.getY();
}
return super.convertValue(context, value, toType);
}
}
6、配置轉換
在ConverterAction 類的同一目錄下定義屬性文件ConverterAction-conversion.properties，注意文件名，-conversion.properties為固定不變，ConverterAction為Action的名字，文件內容：
point=com.test.struts2.action.ConverterPoint
Ok了，這樣就完工了