struts2之单个文件上传

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>