struts2 实现文件上传：

Action 代码：

    package com.action;                import java.io.File;        import java.io.FileInputStream;        import java.io.FileOutputStream;        import java.io.InputStream;        import java.io.OutputStream;                import org.apache.struts2.ServletActionContext;                import com.opensymphony.xwork2.ActionSupport;                public class FileUploadAction extends BaseAction{                                /**            *             */            private static final long serialVersionUID = 1L;                                            /**            * 上传后存放在临时文件夹里的文件            */            private File <span style="color:#ff0000;">file;</span>                        /**            * 文件名称            */            private String <span style="color:#ff0000;">fileFileName</span>;                        /**            * 文件的MIME类型            */            private String<span style="color:#ff0000;"> fileContentType</span>;                                    /**            * 保存的路径            */            private String savePath;                                    public String getSavePath() {                return savePath;            }                    public void setSavePath(String savePath) {                this.savePath = savePath;            }                    public File getFile() {                return file;            }                    public void setFile(File file) {                this.file = file;            }                    public String getFileFileName() {                return fileFileName;            }                    public void setFileFileName(String fileFileName) {                this.fileFileName = fileFileName;            }                    public String getFileContentType() {                return fileContentType;            }                    public void setFileContentType(String fileContentType) {                this.fileContentType = fileContentType;            }                                    public String execute() throws Exception            {                                 String root = ServletActionContext.getServletContext().getRealPath(savePath);                                    InputStream is = new FileInputStream(file);                            OutputStream os = new FileOutputStream(new File(root, fileFileName));                                                            byte[] buffer = new byte[500];                    @SuppressWarnings("unused")                    int length = 0;                                        while(-1 != (length = is.read(buffer, 0, buffer.length)))                    {                        os.write(buffer);                    }                                        os.close();                    is.close();                                                            return SUCCESS;                            }                                }  

struts2.xml配置信息：

    <?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>                    <package name="fileUpload" extends="struts-default" namespace="/">                            <action name="fileUpload_*" class="com.action.FileUploadAction" method="{1}">                                   <param name="savePath">/upload</param> //注意在当前工程里建一个 upload文件夹                                  <result>                    /login.jsp                </result>                                 </action>                            </package>        </struts>  

文件上传的 jsp 页面：

    <form action="fileUpload.action" method="post" enctype="multipart/form-data">               file: <input type="file" name="file"/><br>               <input type="submit" value="submit"/>           </form>  

struts2实现文件下载源码：支持中文文件名

action 的代码：

    package com.action;                import java.io.IOException;        import java.io.InputStream;        import org.apache.struts2.ServletActionContext;                        public class FileDownloadAction extends BaseAction{                    /**            *             */            private static final long serialVersionUID = 1L;            /**            * 文件名称            */            private String fileName;                                    public String getFileName() throws IOException {                                            <span style="color:#ff0000;">return  new String(fileName.getBytes(), "ISO8859-1"); //转码 使其支持中文，不然无法显示文件名的中文字符</span>            }                            public void setFileName(String fileName) {                                            this.fileName = fileName;;                                }                                 public InputStream getInputStream() throws Exception{                             return ServletActionContext.getServletContext().getResourceAsStream( fileName);                                             }                                             public String execute()throws Exception{                            return SUCCESS;                        }        }  

下载的 struts2.xml配置信息：

    <action name="download" class="com.action.FileDownloadAction">                                <result type="stream" name="success">                             <param name="contentDisposition">attachment;fileName="${fileName}"</param>                        <param name="contentType">application/octet-stream;charset=ISO8859-1</param>                        <param name="inputName"><span style="color:#ff0000;">InputStream</span></param> //InputStream 是有Action中的<span style="font-family: Arial; font-size: 14px; line-height: 26px;">getInputStream()方法 去掉get而定的，要一致</span>                        <param name="bufferSize">10485760</param>//文件大小（10M）                    </result>                                            </action>  

jsp页面：

    <a href="download.action?fileName=upload/铭记11er.mp3">点击下载</a>