Struts2——（8）struts2中文件的上传

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

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

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

<?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

<%@ 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

<%@ 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>

巴特西

Struts2——（8）struts2中文件的上传

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