struts2_struts类型转换

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

1. 编写类型转换器,继承strutstypeconverter
2. 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

　　

package com.ahd.entity;

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;
    }
    @override
    public string tostring() {
        return "(" + x + "," + y + ")";
    }
    
}

point

 

　　编写pointaction

　　

package com.ahd.action;

import com.ahd.entity.point;
import com.opensymphony.xwork2.action;
import com.opensymphony.xwork2.actionsupport;

public class pointaction extends actionsupport{
    private point point;
    
    public point getpoint() {
        return point;
    }
    public void setpoint(point point) {
        this.point = point;
    }


    @override
    public string execute() throws exception {
        // todo auto-generated method stub
        system.out.println(point.getx()+point.gety());
        system.out.println(point);
        return action.success;
    }
}

pointaction

 

　　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,

package com.ahd.converter;

import java.util.map;

import org.apache.struts2.util.strutstypeconverter;

import com.ahd.entity.point;

public class pointconverter extends strutstypeconverter{

    @override
    public object convertfromstring(map context, string[] values, class toclass) {
        // todo auto-generated method stub
        string value=values[0];
        point point=new point();
        
        int x=integer.parseint(value.substring(0, value.indexof(",")));
        int y=integer.parseint(value.substring( value.indexof(",")+1,value.length()));
        
        point.setx(x);
        point.sety(y);
        
        return point;
    }

    @override
    public string converttostring(map context, object o) {
        // todo auto-generated method stub
        point point=(point)o;
        return "("+point.getx()+","+point.gety()+")";
    }
    
}

　　

　　struts.xml

　　

<?xml version="1.0" encoding="utf-8"?>

<!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>

struts.xml

 

　　

　　web.xml

　　

<?xml version="1.0" encoding="utf-8"?>
<!doctype web-app public "-//sun microsystems, inc.//dtd web application 2.3//en" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app id="webapp_id">
    <display-name>struts2_02_modeldrive</display-name>
    
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.strutsprepareandexecutefilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>
</web-app>

web.xml