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        大家都知道Servlet上传文件的时候用的是commons-fileupload插件上传的，但是过程极其的麻烦，同样Struts2也有自带的文件上传，但是过程比Servlet里面的简单了不少，接下来请大家看演示：

      我们现在先建一个表单用于上传文件：

package org.web;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {	private File upload;                       //封装上传文件的属性（单个）	private String uploadContentType;          //封装上传文件的类型（单个）	private String uploadFileName;             //封装上传文件的名称（单个）	private String savePath;                   //获取文件上传的路径（单个）		//实现文件的单个上传	public String execute() throws IOException{		byte[]by=new byte[1024];		//获取物理路径"/upload"		String path=ServletActionContext.getServletContext().getRealPath(savePath);		FileInputStream in = new FileInputStream(getUpload());		FileOutputStream out=new FileOutputStream(path+"\\"+getUploadFileName());		int i=in.read(by);		while(i>0){			out.write(by,0,i);			i=in.read(by);		}		in.close();		out.flush();		out.close();		return SUCCESS;	}					public File getUpload() {		return upload;	}	public void setUpload(File upload) {		this.upload = upload;	}	public String getUploadContentType() {		return uploadContentType;	}	public void setUploadContentType(String uploadContentType) {		this.uploadContentType = uploadContentType;	}	public String getUploadFileName() {		return uploadFileName;	}	public void setUploadFileName(String uploadFileName) {		this.uploadFileName = uploadFileName;	}	public String getSavePath() {		return savePath;	}	public void setSavePath(String savePath) {		this.savePath = savePath;	}	}

       接着我们来配置struts.xml文件：

   
   			
    						
     		
     			
      /upload			
      
       /upload_suc.jsp
      		
     		 	
    
   

        注意：

   1.execute的方法千万别写错，要不然上传不到服务器upload里面。

    2.UploadAction里面File upload，此处的upload必须要和jsp里面的name的值一样

   3.文件类型命名：upload+ContentType