commons-fileupload实现单次上传文件（word文档）

首先是这个文件需要用到的maven包

<dependency>
	    <groupId>commons-fileupload</groupId>
	    <artifactId>commons-fileupload</artifactId>
	    <version>1.2.2</version>
	</dependency>
	<dependency>
	    <groupId>commons-io</groupId>
	    <artifactId>commons-io</artifactId>
	    <version>1.3.2</version>
	</dependency>
	<dependency>
	    <groupId>portlet-api</groupId>
	    <artifactId>portlet-api</artifactId>
	    <version>1.0</version>
	</dependency>
	<dependency>
	    <groupId>javax.servlet</groupId>
	    <artifactId>servlet-api</artifactId>
	    <version>2.4</version>
	</dependency>
	<dependency>
	    <groupId>junit</groupId>
	    <artifactId>junit</artifactId>
	    <version>3.8.2</version>
	</dependency>

然后是servlet实现代码

public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");  
          response.setCharacterEncoding("utf-8"); 
          //1、创建一个DiskFileItemFactory工厂  
          DiskFileItemFactory factory=new DiskFileItemFactory();
          //创建解析器
          ServletFileUpload upload=new ServletFileUpload(factory);
          upload.setHeaderEncoding("utf-8");
          factory.setSizeThreshold(1024*500);//内存极限值
          File linshi = new File("E:\linshi");//暂时使用硬盘来解决内存不足的存储问题
          factory.setRepository(linshi);//设置过大的读取路径
          upload.setSizeMax(1024*1024*5);//设置最大值
          try {
            List<FileItem> items = upload.parseRequest(request);
              for (FileItem item : items) {  
                    // 若是一个一般的表单域, 打印信息  
                    if (item.isFormField()) {  
                        String name = item.getFieldName();  
                        String value = item.getString("utf-8");  
                        System.out.println(name + ": " + value);
                    }  
                    // 若是文件域则把文件保存到 e:\files 目录下.  
                    else {  
                        String fileName = item.getName();  
      
                        InputStream in = item.getInputStream(); 
                       
                        
                         
                        fileName=(new Date()).getTime()+"";
                        String fileUrl = "E:/files/" + fileName+".docx";//文件最终上传的位置  
                       
                        OutputStream out = new FileOutputStream(fileUrl);
                        
                        int len=0;
                        byte buffer[] = new byte[1024];
                        //字节流保护文档的完整.不可以使用高级流
                        while((len=in.read(buffer))>0){
                            out.write(buffer, 0, len);
                        }
                        
                      
                        out.close();  
                        in.close();  
                       
                    }  
                }  
        } catch (FileUploadException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        
    }