一、导入包

• 需要将commons-fileupload和commons-io包和struts包一起导入

实现步骤：

1. 在Jsp页面实现客户端选择上传文件
2. 配置Struts.xml，拦截器会自动接收上传的文件
3. 在Action中实现代码上传文件存入服务器中
4. 跳转至新页面展示上传的文件

二、单个文件上传

上传页面

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
     
     
      
      
     

上传成功页面

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %>
     
上传的文件

UploadAction

package com.pb.web.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.apache.commons.io.IOUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {    //上传文件全路径、类型、文件名    private File upload;    private String uploadContentType;    private String uploadFileName;    //新文件保存路径和名称    private String savePah;    public String doUpload() throws IOException{        System.out.println(upload);        System.out.println(uploadContentType);        System.out.println(uploadFileName);        String newFileName=System.currentTimeMillis()+uploadFileName.substring(uploadFileName.lastIndexOf("."));        System.out.println("新的文件名:"+newFileName);        //获取上传路径        savePah=ServletActionContext.getServletContext().getRealPath("/upload/"+newFileName);        System.out.println("上传保存的路径和名称:"+savePah);        //使用文件输入、输出流写入文件        FileInputStream fis=new FileInputStream(upload);        FileOutputStream fos=new FileOutputStream(savePah);        //设置缓冲区大小        /*byte[] bytes=new byte[1024];        //读取文件        int length=fis.read(bytes);        while(length>0){            //写入文件            fos.write(bytes);            length=fis.read(bytes);        }*/        //复制文件        IOUtils.copy(fis, fos);        fos.flush();        fos.close();        fis.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 getSavePah() {        return savePah;    }    public void setSavePah(String savePah) {        this.savePah = savePah;    }            }

 

 

struts.xml

     
         
          
         
          
           
        
             /singleUploadSuccess.jsp    
            
        
             /error.jsp    
            
        
             /singleUpload.jsp    
            
           
      
     

三、限制文件大小

• 在struts.xml中配置常量

     5M大小

在action下配置拦截器

         
      5000000        
         
     

五、限制文件类型

         
      image/pjpeg,image/jpeg,image/gif,image/png    
      5000000        
         
     

 

     
         
          
          
          
          
          
           
                    
         40000             
         image/jpeg,image/pjpeg,image/gif,image/png        
                 
            
        
             /oneUploadSuccess.jsp    
            
        
             /error.jsp    
            
           
      
     

 

六、多个文件上传

和单个文件上传一个只是接收参数变为数组

mulUpload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
     
     
      
      
      
      
     

error.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %>
     上传失败返回
     

mulUploadSuccess.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %>
     
     
     
      
     
     

UploadAction.java

package com.pb.web.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.apache.commons.io.IOUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {    // 文件上传路径、类型、名称    private List
     
       upload;    private List
      
        uploadFileName;    private List
       
         uploadContentType;    // 新的文件名称    private List
        
          savePath=new ArrayList
         
          ();    public String upload() throws IOException {        for (int i = 0; i < upload.size(); i++) {            //重命名 用长时间+原来的文件名            String newFileName = System.currentTimeMillis()+""+uploadFileName.get(i);            System.out.println("新的文件名:"+newFileName);        //获取上传路径            //将新的路径和名称添加入集合            savePath.add(ServletActionContext.getServletContext().getRealPath("/upload/"+newFileName));            System.out.println(savePath.get(i));            //读取文件            FileInputStream fis=new FileInputStream(upload.get(i));            //写入文件            FileOutputStream fos=new FileOutputStream(savePath.get(i));            //将文件从输入流，复制到输出流中            IOUtils.copy(fis, fos);            //强制刷新输出流，清空缓冲区            fos.flush();            fos.close();            fis.close();        }        return SUCCESS;    }    public List
          
            getUpload() { return upload; } public void setUpload(List
           
             upload) { this.upload = upload; } public List
            
              getUploadFileName() { return uploadFileName; } public void setUploadFileName(List
             
               uploadFileName) { this.uploadFileName = uploadFileName; } public List
              
                getUploadContentType() { return uploadContentType; } public void setUploadContentType(List
               
                 uploadContentType) { this.uploadContentType = uploadContentType; } public List
                
                  getSavePath() { return savePath; } public void setSavePath(List
                 
                   savePath) { this.savePath = savePath; }}
                 
                
               
              
             
            
           
          
         
        
       
      
     

struts.xml

     
         
          
          
          
              
          
          
               
            
             
         image/jpeg,image/pjpeg,image/png    
             
         5000000    
            
            
                
        
             /mulUploadSuccess.jsp    
            
        
             /error.jsp    
            
           
      
     

更详细的请参考：struts下载包中的帮助文档：

file://stuts2/struts2-2.3.4.1-all/struts-2.3.4.1/docs/WW/file-upload.html