第一步：首先写个上传文件的页面（简单的一个form表单）

         
文件上传
    
    
     
              文件上传1：
      
      
        
      
      
      
        
          
     
    

第二步：创建一个基类BaseAction.java,继承ActionSupport，并实现ServletRequestAware,ServletResponseAware,ServletContextAware三个接口，重写三个接口的set方法

public class BaseAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware{    /**     * 编写一个基类，继承ActionSupport并实现相应的接口     * 以后的Action直接继承该类，就可以简单获取到Servlet API     * 这是一个典型的适配设计模式     * @author Owen     */    private static final long serialVersionUID = 7267018575222346353L;            @Override    public void setServletContext(ServletContext servletContext) {    }    @Override    public void setServletResponse(HttpServletResponse response) {    }    @Override    public void setServletRequest(HttpServletRequest request) {    }}

第三步：创建OneUploadAction请求处理类，继承BaseAction

public class OneUploadAction extends BaseAction {    private static final long serialVersionUID = -4445894434193884175L;//    该属性名必须和中name值一致    private File oneFile;//    真实名称    private String oneFileFileName;//    文件类型    private String oneFileContentType;        private HttpServletRequest request;        @Override    public void setServletRequest(HttpServletRequest request) {        this.request = request;    }    @Override    public String execute() throws Exception {//        获取保存上传文件在服务器的真是路径        String uploadPath = request.getServletContext().getRealPath("upload");        System.out.println(uploadPath);//目录真是路径        System.out.println("oneFile--"+oneFile.getName());//文件临时名称        System.out.println("oneFileFileName--"+oneFileFileName);//文件原始名称        System.out.println("oneFileContentType--"+oneFileContentType);//文件类型//        第一种：该步骤适合上传小文件//        将临时文件复制到硬盘上的真是路径        /*        File file = new File(uploadPath, oneFileFileName);//拼接文件的存放路径和存放文件的真实名称        FileUtils.copyFile(oneFile, file);//将临时文件复制到上面这个路径        */        //        第二种：适合大文件上传操作        /*InputStream is = null;        OutputStream os = null;                is = new FileInputStream(oneFile);        os = new FileOutputStream(new File(uploadPath,oneFileFileName));                byte[] buffer = new byte[500];        int length = 0;        while((length=is.read(buffer,0,buffer.length)) != -1){            os.write(buffer, 0,length);        }        os.close();        is.close();*/        copyFile(uploadPath);                return SUCCESS;    }    public void copyFile(String uploadPath){        InputStream is = null;        OutputStream os = null;                try {            is = new FileInputStream(oneFile);            os = new FileOutputStream(new File(uploadPath,oneFileFileName));                        byte[] buffer = new byte[500];            int len = 0;            while((len=is.read(buffer,0,buffer.length)) != -1){                os.write(buffer, 0,len);            }            os.close();            is.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }            }    public File getOneFile() {        return oneFile;    }    public void setOneFile(File oneFile) {        this.oneFile = oneFile;    }    public String getOneFileFileName() {        return oneFileFileName;    }    public void setOneFileFileName(String oneFileFileName) {        this.oneFileFileName = oneFileFileName;    }    public String getOneFileContentType() {        return oneFileContentType;    }    public void setOneFileContentType(String oneFileContentType) {        this.oneFileContentType = oneFileContentType;    }    }

第三步：配置struts.xml文件

         
                      
                   
        
         /WEB-INF/jsp/one_upload_ok.jsp
                
                   
      
     

第四步：浏览器测试