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struts2单个文件上传的两种实现方式

通过2种方式模拟单个文件上传,效果如下所示

开发步骤如下:

1、新建一个web工程,导入struts2上传文件所需jar,如下图

目录结构

2、新建Action

第一种方式

代码如下:
package com.ljq.action;

import java.io.File;

import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings(“serial”)public class UploadAction extends ActionSupport{    private File image; //上传的文件    private String imageFileName; //文件名称    private String imageContentType; //文件类型

    public String execute() throws Exception {        String realpath = ServletActionContext.getServletContext().getRealPath(“/images”);        //D:\apache-tomcat-6.0.18\webapps\struts2_upload\images        System.out.println(“realpath: “+realpath);        if (image != null) {            File savefile = new File(new File(realpath), imageFileName);            if (!savefile.getParentFile().exists())                savefile.getParentFile().mkdirs();            FileUtils.copyFile(image, savefile);            ActionContext.getContext().put(“message”, “文件上传成功”);        }        return “success”;    }

    public File getImage() {        return image;    }

    public void setImage(File image) {        this.image = image;    }

    public String getImageFileName() {        return imageFileName;    }

    public void setImageFileName(String imageFileName) {        this.imageFileName = imageFileName;    }

    public String getImageContentType() {        return imageContentType;    }

    public void setImageContentType(String imageContentType) {        this.imageContentType = imageContentType;    }

    }

第二种方式

代码如下:
package com.ljq.action;

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings(“serial”)public class UploadAction2 extends ActionSupport {

    // 封装上传文件域的属性    private File image;    // 封装上传文件类型的属性    private String imageContentType;    // 封装上传文件名的属性    private String imageFileName;    // 接受依赖注入的属性    private String savePath;

    @Override    public String execute() {        FileOutputStream fos = null;        FileInputStream fis = null;        try {            // 建立文件输出流            System.out.println(getSavePath());            fos = new FileOutputStream(getSavePath() + “\\” + getImageFileName());            // 建立文件上传流            fis = new FileInputStream(getImage());            byte[] buffer = new byte[1024];            int len = 0;            while ((len = fis.read(buffer)) > 0) {                fos.write(buffer, 0, len);            }        } catch (Exception e) {            System.out.println(“文件上传失败”);            e.printStackTrace();        } finally {            close(fos, fis);        }        return SUCCESS;    }

    /**     * 返回上传文件的保存位置     *      * @return     */    public String getSavePath() throws Exception{        return ServletActionContext.getServletContext().getRealPath(savePath);     }

    public void setSavePath(String savePath) {        this.savePath = savePath;    }

    public File getImage() {        return image;    }

    public void setImage(File image) {        this.image = image;    }

    public String getImageContentType() {        return imageContentType;    }

    public void setImageContentType(String imageContentType) {        this.imageContentType = imageContentType;    }

    public String getImageFileName() {        return imageFileName;    }

    public void setImageFileName(String imageFileName) {        this.imageFileName = imageFileName;    }

    private void close(FileOutputStream fos, FileInputStream fis) {        if (fis != null) {            try {                fis.close();            } catch (IOException e) {                System.out.println(“FileInputStream关闭失败”);                e.printStackTrace();            }        }        if (fos != null) {            try {                fos.close();            } catch (IOException e) {                System.out.println(“FileOutputStream关闭失败”);                e.printStackTrace();            }        }    }

}

struts.xml配置文件

代码如下:
<?xml version=”1.0″ encoding=”UTF-8″ ?><!DOCTYPE struts PUBLIC    “-//Apache Software Foundation//DTD Struts Configuration 2.0//EN”    “http://struts.apache.org/dtds/struts-2.0.dtd”>

<struts>    <!– 该属性指定需要Struts2处理的请求后缀,该属性的默认值是action,即所有匹配*.action的请求都由Struts2处理。        如果用户需要指定多个请求后缀,则多个后缀之间以英文逗号(,)隔开。 –>    <constant name=”struts.action.extension” value=”do” />    <!– 设置浏览器是否缓存静态内容,默认值为true(生产环境下使用),开发阶段最好关闭 –>    <constant name=”struts.serve.static.browserCache” value=”false” />    <!– 当struts的配置文件修改后,系统是否自动重新加载该文件,默认值为false(生产环境下使用),开发阶段最好打开 –>    <constant name=”struts.configuration.xml.reload” value=”true” />    <!– 开发模式下使用,这样可以打印出更详细的错误信息 –>    <constant name=”struts.devMode” value=”true” />    <!– 默认的视图主题 –>    <constant name=”struts.ui.theme” value=”simple” />    <!–<constant name=”struts.objectFactory” value=”spring” />–>    <!–解决乱码    –>    <constant name=”struts.i18n.encoding” value=”UTF-8″ />    <!– 指定允许上传的文件最大字节数。默认值是2097152(2M) –>    <constant name=”struts.multipart.maxSize” value=”10701096″/>    <!– 设置上传文件的临时文件夹,默认使用javax.servlet.context.tempdir –>    <constant name=”struts.multipart.saveDir ” value=”d:/tmp” />             <package name=”upload” namespace=”/upload” extends=”struts-default”>        <action name=”*_upload” class=”com.ljq.action.UploadAction” method=”{1}”>            <result name=”success”>/WEB-INF/page/message.jsp</result>        </action>    </package>    <package name=”upload2″ extends=”struts-default”>        <action name=”upload2″ class=”com.ljq.action.UploadAction2″ method=”execute”>            <!– 动态设置savePath的属性值 –>            <param name=”savePath”>/images</param>            <result name=”success”>/WEB-INF/page/message.jsp</result>            <result name=”input”>/upload/upload.jsp</result>            <interceptor-ref name=”fileUpload”>                <!– 文件过滤 –>                <param name=”allowedTypes”>image/bmp,image/png,image/gif,image/jpeg</param>                <!– 文件大小, 以字节为单位 –>                <param name=”maximumSize”>1025956</param>            </interceptor-ref>            <!– 默认拦截器必须放在fileUpload之后,否则无效 –>            <interceptor-ref name=”defaultStack” />        </action>    </package></struts>

上传表单页面

代码如下:
<%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%><%@taglib uri=”/struts-tags” prefix=”s” %>

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”><html>    <head>        <title>文件上传</title>

        <meta http-equiv=”pragma” content=”no-cache”>        <meta http-equiv=”cache-control” content=”no-cache”>        <meta http-equiv=”expires” content=”0″>    </head>

    <body>        <!– ${pageContext.request.contextPath}/upload/execute_upload.do –>        <!– ${pageContext.request.contextPath}/upload2/upload2.do –>        <form action=”${pageContext.request.contextPath}/upload2/upload2.do”               enctype=”multipart/form-data” method=”post”>            文件:<input type=”file” name=”image”>                <input type=”submit” value=”上传” />        </form>        <br/>        <s:fielderror />    </body></html>

显示结果页面

代码如下:
<%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%><%@ taglib uri=”/struts-tags” prefix=”s”%><!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”><html>  <head>    <title>上传成功</title>    <meta http-equiv=”pragma” content=”no-cache”>    <meta http-equiv=”cache-control” content=”no-cache”>    <meta http-equiv=”expires” content=”0″>      </head>  <body>    上传成功!    <br/><br/>    <!– ${pageContext.request.contextPath} tomcat部署路径,          如:D:\apache-tomcat-6.0.18\webapps\struts2_upload\ –>    <img src=”${pageContext.request.contextPath}/<s:property value=”‘images/’+imageFileName”/>”>    <s:debug></s:debug>  </body></html>

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