Struts2文件上传

复习一下基于Struts2的文件上传下载
这部分是上传功能，支持多个文件的上传，允许限定上传的文件类型
实例中，以限定上传文件为图片格式为例

转载请注明出处：http://blog.csdn.net/u012219290

基本效果：

选择文件上传：

上传成功：

上传失败：

项目结构：

开发步骤：

1.新建Struts2Upload项目工程，导入struts2需要的jar包（项目结构图中），配置web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <filter>    <filter-name>struts2</filter-name>    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  </filter>   <filter-mapping>    <filter-name>struts2</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping> </web-app>

2.新建FileUploadAction.java

package action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;/** * Struts2文件上传,支持多个文件 *  * @author Administrator *  */@SuppressWarnings("unused")public class FileUploadAction extends ActionSupport {    private static final long serialVersionUID = 1L;    private File[] upload;// 文件 必须与上传的input的name一致    private String[] uploadFileName;// 文件名 **FileName    private String[] uploadContentType;// 文件类型 **ContentType    private String allowTypes;//允许上传的文件类型    private String savePath;// 文件上传保存目录    private int saveCount;// 上传保存成功的个数    private String msg;//返回的提示信息    public String fileUpload() {        String realPath = ServletActionContext.getServletContext()                .getRealPath(savePath);        File file = new File(realPath);        if (!file.exists()) {            file.mkdirs();        }        try {            if (upload != null && upload.length > 0) {                //校验是否存在不允许上传的文件类型                if(!filterTypes(allowTypes,uploadContentType)){                    msg = "存在不允许的文件类型";                    return "upload";                }                saveCount = fileCopy(upload, uploadFileName, realPath);                //saveCount = fileCopy2(upload, uploadFileName, realPath);                msg = "恭喜你,上传成功啦";            }        } catch (Exception e) {            e.printStackTrace();        }        return SUCCESS;    }    /**     * 使用文件流保存文件     * @param files 文件数组     * @param fileNames 文件名数组     * @param realPath 保存路径     * @return 保存成功的文件个数     * @throws Exception     */    private int fileCopy(File[] files, String[] fileNames, String realPath)            throws Exception {        FileInputStream in = null;        FileOutputStream out = null;        int count = 0;        for (int i = 0; i < files.length; i++) {            System.out.println("文件名：" + fileNames[i] +" 文件类型：" + uploadContentType[i]);            in = new FileInputStream(files[i]);            out = new FileOutputStream(realPath + File.separator + fileNames[i]);            byte[] b = new byte[1024];            int len = 0;            while ((len = in.read(b)) != -1) {                out.write(b, 0, len);            }            count++;        }        in.close();        out.close();        return count;    }    /**     * 使用org.apache.commons.io.FileUtils工具类保存     * @param files 文件数组     * @param fileNames 文件名数组     * @param realPath 保存路径     * @return 保存成功的文件个数     * @throws Exception     */    private int fileCopy2(File[] files, String[] fileNames, String realPath)            throws Exception {        int count = 0;        for (int i = 0; i < files.length; i++) {            FileUtils.copyFile(files[i], new File(realPath                     + File.separator                    + fileNames[i]));            count++;        }        return count;    }    /**     * 手动过滤,也可以通过配置struts2的fileUpload拦截器过滤     * @param types 允许上传的文件类型字符串（逗号分隔）     * @param allTypes 上传文件的类型数组     * @return true:符合  false:不符合     */    private boolean filterTypes(String types,String[] allTypes){        if(types==null && "".equals(types)){            return true;        }        for(String str : allTypes){            if(!types.contains(str)){                return false;            }        }        return true;    }    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }    public String getAllowTypes() {        return allowTypes;    }    public void setAllowTypes(String allowTypes) {        this.allowTypes = allowTypes;    }    public int getSaveCount() {        return saveCount;    }    public void setSaveCount(int saveCount) {        this.saveCount = saveCount;    }    public String[] getUploadFileName() {        return uploadFileName;    }    public void setUploadFileName(String[] uploadFileName){        this.uploadFileName = uploadFileName;    }    public String[] getUploadContentType() {        return uploadContentType;    }    public void setUploadContentType(String[] uploadContentType) {        this.uploadContentType = uploadContentType;    }    public String getSavePath() {        return savePath;    }    public void setSavePath(String savePath) {        this.savePath = savePath;    }    public File[] getUpload() {        return upload;    }    public void setUpload(File[] upload) {        this.upload = upload;    }}

3.配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"    "http://struts.apache.org/dtds/struts-2.3.dtd"><struts>    <!--将默认上传的文件大小改为500MB -->    <constant name="struts.multipart.maxSize" value="524288000"/>    <!--编码-->    <constant name="struts.i18n.encoding" value="UTF-8" />    <!--开发模式-->    <constant name="struts.devMode" value="true" />    <package name="default" extends="json-default" namespace="/">        <action name="fileUploadAction" class="action.FileUploadAction" method="fileUpload">            <!-- 配置文件保存路径 -->            <param name="savePath">/upload</param>            <!-- 配置允许上传的文件类型-->            <param name="allowTypes">image/png,image/gif,image/jpg,image/jpeg</param>            <result name="success">/success.jsp</result>            <result name="upload">/upload.jsp</result>        </action>    </package></struts>

4.新建upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>    <head>        <base href="<%=basePath%>">        <title>文件上传</title>    </head>    <body>        <span style="color:red">${msg}</span><br/>        <fieldset style="width: 50%;border-color: #99CCCC">            <legend>图片上传</legend>            <form action="fileUploadAction.action" enctype="multipart/form-data" method="post">                <input type="file" name="upload" multiple="multiple"/>                <input type="submit" value="上传"><br/><br/>                <span style="color:red;font-size:10px">图片格式仅限jpeg、jpg、png</span>            </form>            <!--             如果浏览器不支持 multiple="multiple" 则使用多个input的形式            <form action="fileUploadAction.action" enctype="multipart/form-data" method="post">                <input type="file" name="upload"/><br/>                <input type="file" name="upload" /><br/>                <input type="file" name="upload" /><br/>                <input type="submit" value="上传"><br/><br/>                <span style="color:red;font-size:10px">图片格式仅限jpeg、jpg、png</span>            </form>             -->        </fieldset>    </body></html>

5.新建success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib uri="/struts-tags" prefix="s"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>    <head>        <base href="<%=basePath%>">        <title>文件上传</title>    </head>    <body>        <span style="color:red;font-size:20px">${msg}</span><br/>        <!-- 个数：${saveCount}<br/> -->        <c:forEach items="${uploadFileName}" var="fileName">            <img style="width: 200px;margin-bottom: 5px;margin-left: 200px"                 src="<%=basePath%>/${savePath}/${fileName}"><br/>        </c:forEach>    </body></html>

6.部署项目到tomcat，浏览器访问http://localhost:8080/Struts2Upload/upload.jsp

转载请注明出处：http://blog.csdn.net/u012219290