Struts2数据类型转换-优快云博客

本文介绍如何在Struts2框架中实现日期类型的输入与输出转换。通过自定义转换器，能够将表单中的字符串形式的日期转换为Java Date类型，并能将Date类型的日期对象转换回字符串显示在页面上。

页面输入data类型字符串转换成data类型

jsp页面

<s:form action="conversion">
        <s:textfield name="age" label="Age"></s:textfield>
        <s:textfield name="birth" label="Birth"></s:textfield>
        <s:submit></s:submit>
    </s:form>

converter 转换所有Data类型

package com.converters;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import javax.servlet.ServletContext;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.util.StrutsTypeConverter;

public class DateConverter extends StrutsTypeConverter {

    private DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    
    public DateConverter() {
        //System.out.println("DateConverter's constructor...");
    }
    
    
    @Override
    public Object convertFromString(Map context, String[] values, Class toClass) {
        
        //System.out.println("convertFromString...");
        
        if(toClass == Date.class){
            if(values != null && values.length > 0){//String转换成Data
                String value = values[0];
                //System.out.println(value);
                try {
                    return dateFormat.parseObject(value);
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }
        }
        
        //若没有转换成功, 则返回 values
        return values;
    }

    @Override
    public String convertToString(Map context, Object o) {//Data转换成String到页面
        
        System.out.println("convertToString...");
        
        if(o instanceof Date){
            Date date = (Date) o;
            return dateFormat.format(date);
        }
        
        //若转换失败返回 null
        return null;
    }

}

在src目录下配置xwork-conversion.properties文件其中内容

java.util.Date=com.converters.DateConverter

Student类

package com.converters;

import java.util.Date;

public class Student {
    private int age;

    public void setAge(int age) {
        this.age = age;
    }

    public int getAge() {
        return age;
    }

    private Date birth;//Data型

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public Date getBirth() {
        return birth;
    }

    @Override
    public String toString() {
        return "Student [age=" + age + ", birth=" + birth + "]";
    }
    
}

ConversionAction

package com.converters;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class ConversionAction extends ActionSupport implements ModelDriven<Student>{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    public String execute(){
        System.out.println("Student: " + stu);
        return "success";
    }
    
    private Student stu;

    @Override
    public Student getModel() {
        stu = new Student();
        return stu;
    }
    
}