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>  

来自：http://blog.csdn.net/u013147600/article/details/44919719