struts2 文件上传 三种方式

struts.multipart.maxSize=10240000：用于限制上传文件的大小
struts.multipart.allowedTypes=.xls,.zip:用于限制上传文件类型
struts.multipart.parser=pell:解决上传空文件的报错问题

struts.multipart.saveDir：该属性指定上传文件的临时保存路径,该属性的默认值是javax.servlet.context.tempdir

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 {
        ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
        String realpath = ServletActionContext.getServletContext().getRealPath("/images");
        System.out.println(realpath);
        if (image != null) {
            File savedir=new File(realpath);
            if(!savedir.getParentFile().exists())
                savedir.getParentFile().mkdirs();
            for(int i=0;i<image.length;i++){
                File savefile = new File(savedir, imageFileName[i]);
                FileUtils.copyFile(image[i], 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[] getImageContentType() {
        return imageContentType;
    }

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

    public String[] getImageFileName() {
        return imageFileName;
    }

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

}

第二种方式

package com.ljq.action;

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

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
/**
 * 使用数组上传多个文件
 *
 * @author ljq
 *
 */
@SuppressWarnings("serial")
public class UploadAction2 extends ActionSupport{
    private File[] image; //上传的文件
    private String[] imageFileName; //文件名称
    private String[] imageContentType; //文件类型
    private String savePath;

    @Override
    public String execute() throws Exception {
        ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
        //取得需要上传的文件数组
        File[] files = getImage();
        if (files !=null && files.length > 0) {
            for (int i = 0; i < files.length; i++) {
                //建立上传文件的输出流, getImageFileName()[i]
                System.out.println(getSavePath() + "\\" + getImageFileName()[i]);
                FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName()[i]);
                //建立上传文件的输入流
                FileInputStream fis = new FileInputStream(files[i]);
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len=fis.read(buffer))>0) {
                    fos.write(buffer, 0, len);
                }
                fos.close();
                fis.close();
            }
        }
        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;
    }

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

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

}

第三种方式

package com.ljq.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**
 * 使用List上传多个文件
 *
 * @author ljq
 *
 */
@SuppressWarnings("serial")
public class UploadAction3 extends ActionSupport {
    private List<File> image; // 上传的文件
    private List<String> imageFileName; // 文件名称
    private List<String> imageContentType; // 文件类型
    private String savePath;

    @Override
    public String execute() throws Exception {
        ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
        // 取得需要上传的文件数组
        List<File> files = getImage();
        if (files != null && files.size() > 0) {
            for (int i = 0; i < files.size(); i++) {
                FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName().get(i));
                FileInputStream fis = new FileInputStream(files.get(i));
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len = fis.read(buffer)) > 0) {
                    fos.write(buffer, 0, len);
                }
                fis.close();
                fos.close();
            }
        }
        return SUCCESS;
    }

    public List<File> getImage() {
        return image;
    }

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

    public List<String> getImageFileName() {
        return imageFileName;
    }

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

    public List<String> getImageContentType() {
        return imageContentType;
    }

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

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

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

}

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" />
    <constant name="struts.multipart.maxSize" value="10701096"/>

    <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="upload1" namespace="/upload1" extends="struts-default">
        <action name="upload1" class="com.ljq.action.UploadAction2" method="execute">
            <!-- 要创建/image文件夹，否则会报找不到文件 -->
            <param name="savePath">/image</param>
            <result name="success">/WEB-INF/page/message.jsp</result>
        </action>
    </package>
    <package name="upload2" namespace="/upload2" extends="struts-default">
        <action name="upload2" class="com.ljq.action.UploadAction3" method="execute">
            <!-- 要创建/image文件夹，否则会报找不到文件 -->
            <param name="savePath">/image</param>
            <result name="success">/WEB-INF/page/message.jsp</result>
        </action>
    </package>
</struts>

上传表单页面upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!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}/upload1/upload1.do -->
        <!-- ${pageContext.request.contextPath}/upload2/upload2.do -->
        <!--  -->
        <form action="${pageContext.request.contextPath}/upload2/upload2.do" enctype="multipart/form-data" method="post">
            文件1:<input type="file" name="image"><br/>
            文件2:<input type="file" name="image"><br/>
            文件3:<input type="file" name="image"><br/>
                <input type="submit" value="上传" />
        </form>
    </body>
</html>

显示页面message.jsp

<%@ 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>My JSP 'message.jsp' starting page</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/>
  <s:debug></s:debug>