struts2_struts类型转换

发布时间：2020-12-14 06:26:15 所属栏目：Java 来源：网络整理

导读：一.在Servlet中,表单提交的非字符串类型需要手动转换 1.在struts中,表单提供的常见数据类型struts框架自动转换,无需手动转换 2.在某些情况下,某些自定义类型struts不能完成自动转换,需要进行手动转换,如果需要转换的类型转换频率较高时,手动转换的代码增多,

一.在Servlet中,表单提交的非字符串类型需要手动转换

　　1.在struts中,表单提供的常见数据类型struts框架自动转换,无需手动转换

　　2.在某些情况下,某些自定义类型struts不能完成自动转换,需要进行手动转换,如果需要转换的类型转换频率较高时,手动转换的代码增多,这时可以使用struts的类型转换器来进行转换

二.类型转换

使用类型转换的步骤

编写类型转换器,继承StrutsTypeConverter
编写xwork-conversion.properties配置文件,内容为:要转换的类型=类型转换器

?案例:

　　编写实体类:Point

public class Point {
private int x;
private int y;

</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;int</span><span style="color: #000000"&gt; getX() {
    </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; x;
}
</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;void</span> setX(<span style="color: #0000ff"&gt;int</span><span style="color: #000000"&gt; x) {
    </span><span style="color: #0000ff"&gt;this</span>.x =<span style="color: #000000"&gt; x;
}
</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;int</span><span style="color: #000000"&gt; getY() {
    </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; y;
}
</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;void</span> setY(<span style="color: #0000ff"&gt;int</span><span style="color: #000000"&gt; y) {
    </span><span style="color: #0000ff"&gt;this</span>.y =<span style="color: #000000"&gt; y;
}
@Override
</span><span style="color: #0000ff"&gt;public</span><span style="color: #000000"&gt; String toString() {
    </span><span style="color: #0000ff"&gt;return</span> "(" + x + "," + y + ")"<span style="color: #000000"&gt;;
}

}

　　编写PointAction

import com.ahd.entity.Point;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionSupport;

public class PointAction extends ActionSupport{
private Point point;

</span><span style="color: #0000ff"&gt;public</span><span style="color: #000000"&gt; Point getPoint() {
    </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; point;
}
</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;void</span><span style="color: #000000"&gt; setPoint(Point point) {
    </span><span style="color: #0000ff"&gt;this</span>.point =<span style="color: #000000"&gt; point;
}


@Override
</span><span style="color: #0000ff"&gt;public</span> String execute() <span style="color: #0000ff"&gt;throws</span><span style="color: #000000"&gt; Exception {
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; TODO Auto-generated method stub</span>
    System.out.println(point.getX()+<span style="color: #000000"&gt;point.getY());
    System.out.println(point);
    </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; Action.SUCCESS;
}

}

　　xwork-conversion.properties

com.ahd.entity.Point=com.ahd.converter.PointConverter

　　编写类型转换器:PointTypeConverter,继承StrutsTypeConverter类,并重写convertFromString方法和convertToString方法,

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.ahd.entity.Point;

public class PointConverter extends StrutsTypeConverter{

@Override
</span><span style="color: #0000ff"&gt;public</span><span style="color: #000000"&gt; Object convertFromString(Map context,String[] values,Class toClass) {
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; TODO Auto-generated method stub</span>
    String value=values[0<span style="color: #000000"&gt;];
    Point point</span>=<span style="color: #0000ff"&gt;new</span><span style="color: #000000"&gt; Point();

    </span><span style="color: #0000ff"&gt;int</span> x=Integer.parseInt(value.substring(0,value.indexOf(","<span style="color: #000000"&gt;)));
    </span><span style="color: #0000ff"&gt;int</span> y=Integer.parseInt(value.substring( value.indexOf(",")+1<span style="color: #000000"&gt;,value.length()));

    point.setX(x);
    point.setY(y);

    </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; point;
}

@Override
</span><span style="color: #0000ff"&gt;public</span><span style="color: #000000"&gt; String convertToString(Map context,Object o) {
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; TODO Auto-generated method stub</span>
    Point point=<span style="color: #000000"&gt;(Point)o;
    </span><span style="color: #0000ff"&gt;return</span> "("+point.getX()+","+point.getY()+")"<span style="color: #000000"&gt;;
}

}

　　struts.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"struts-2.0.dtd">

<struts>
<package name="struts2" extends="struts-default" namespace="">
<action name="point" class="com.ahd.action.PointAction">
<result>/success.jsp</result>
<result name="input">/input.jsp</result>
</action>
</package>
</struts>

　　web.xml

struts2_02_modelDrive

<span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;filter</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;filter-name</span><span style="color: #0000ff"&gt;></span>struts2<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;filter-name</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;filter-class</span><span style="color: #0000ff"&gt;></span>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;filter-class</span><span style="color: #0000ff"&gt;></span>
<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;filter</span><span style="color: #0000ff"&gt;></span>
<span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;filter-mapping</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;filter-name</span><span style="color: #0000ff"&gt;></span>struts2<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;filter-name</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;url-pattern</span><span style="color: #0000ff"&gt;></span>/*<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;url-pattern</span><span style="color: #0000ff"&gt;></span>
<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;filter-mapping</span><span style="color: #0000ff"&gt;></span>

<span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file-list</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>index.html<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>index.htm<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>index.jsp<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>default.html<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>default.htm<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>
    <span style="color: #0000ff"&gt;<</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>default.jsp<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file</span><span style="color: #0000ff"&gt;></span>
<span style="color: #0000ff"&gt;</</span><span style="color: #800000"&gt;welcome-file-list</span><span style="color: #0000ff"&gt;></span>

</web-app>

（编辑：李大同）

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