转自：http://www.2cto.com/kf/201403/282787.html

第一种解决方案：

1.手动实现文件过滤：

判断上传的文件是否在允许的范围内
定义该Action允许上传的文件类型 private String allowTypes;
利用Struts2的输入效验判断用户的输入的文件是否合理

UploadAction.java

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package action;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
 
import org.apache.struts2.ServletActionContext;
 
import com.opensymphony.xwork2.ActionSupport;
 
public class UploadAction extends ActionSupport {
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private String title;
    private File uploadfile;
    private String uploadfileContentType;
    private String uploadfileFileName;
    private String savePath;
    private String allowType;//定义该Action允许上传的文件类型
     
    public boolean check(String type){
        String[] types=allowType.split(",");
        for(String s:types){
            if(s.equals(type)){
                return true;
            }
        }
        return false;
         
    }
    public void  validate(){
        boolean b=check(uploadfileContentType);
        if(!b){
            addFieldError("upload","上传文件错误");
        }
    }
    public String getAllowType() {
        return allowType;
    }
 
    public void setAllowType(String allowType) {
        this.allowType = allowType;
    }
 
    public String upload()  throws  Exception {
         
         
        FileInputStream fis = new FileInputStream(getUploadfile());
        FileOutputStream  fos=new FileOutputStream(getSavePath()+"\\"+getUploadfileFileName());
        byte[] buffer=new byte[1024];
        int len=0;
        while((len=fis.read(buffer))>0){
            fos.write(buffer,0,len);
        }
        fos.close();
        fis.close();
         
        return SUCCESS;
    }
 
    public String getTitle() {
        return title;
    }
 
    public void setTitle(String title) {
        this.title = title;
    }
 
 
    public File getUploadfile() {
        return uploadfile;
    }
 
    public void setUploadfile(File uploadfile) {
        this.uploadfile = uploadfile;
    }
 
    public String getUploadfileContentType() {
        return uploadfileContentType;
    }
 
    public void setUploadfileContentType(String uploadfileContentType) {
        this.uploadfileContentType = uploadfileContentType;
    }
 
    public String getUploadfileFileName() {
        return uploadfileFileName;
    }
 
    public void setUploadfileFileName(String uploadfileFileName) {
        this.uploadfileFileName = uploadfileFileName;
    }
 
    public String getSavePath() {
        return ServletActionContext.getServletContext().getRealPath(savePath);//得到绝对路径
    }
 
    public void setSavePath(String savePath) {
        this.savePath = savePath;
    }
 
}

struts.xml

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<!--?xml version="1.0" encoding="UTF-8"?-->
 
<struts>
 
    <package name="hello" namespace="/hello" extends="struts-default">
         
            <!-- 设置允许上传的文件类型 -->
                <param name="allowType">image/x-png,file/txt,image/jpeg
             
            <param name="savePath">/uploadFiles
            <result name="success">
                /success.jsp
            </result>
            <result name="input">
                /index.jsp
            </result>
        </action>
    </package>
</struts>

index.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib  prefix="s"  uri="/struts-tags"%>>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
 
<html>
   
     
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">   
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
   
   
   
  <s:fielderror>
    <form action="/Upload-1/hello/login" method="post" enctype="multipart/form-data">
    文件名：<input type="text" name="title">
    文件：<input type="file" name="uploadfile">
<input type="submit">
    </form>
   
 
</s:fielderror>

success.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib  prefix="s" uri="/struts-tags"%>
 
   
   
  <%
String path = request.getContextPath();
  System.out.println(path);
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
System.out.println(basePath);
%>
   
  上传成功！<br>
  文件标题：<s:property value="title"><br>
  文件为:<img src="" 'uploadfiles="" '+uploadfilefilename"="" style="display: none;"><img alt="加载中..." title="图片加载中..." src="http://www.2cto.com/statics/images/s_nopic.gif">"/><br>
   
 
</s:property>

第二种解决方案：

2.拦截器实现文件过滤：

配置fileUpload拦截器两个参数：
allowedTypes:允许上传文件的类型，多个值用,分开
maximumSize:允许上传文件的大小，单位字节。

UploadAction.java

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package action;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
 
import org.apache.struts2.ServletActionContext;
 
import com.opensymphony.xwork2.ActionSupport;
 
public class UploadAction extends ActionSupport {
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private String title;
    private File uploadfile;
    private String uploadfileContentType;
    private String uploadfileFileName;
    private String savePath;
    private String allowedTypes;
     
     
        public String getAllowedTypes() {
        return allowedTypes;
    }
    public void setAllowedTypes(String allowedTypes) {
        this.allowedTypes = allowedTypes;
    }
 
    public String upload()  throws  Exception {
         
         
        FileInputStream fis = new FileInputStream(getUploadfile());
        FileOutputStream  fos=new FileOutputStream(getSavePath()+"\\"+getUploadfileFileName());
        byte[] buffer=new byte[1024];
        int len=0;
        while((len=fis.read(buffer))>0){
            fos.write(buffer,0,len);
        }
        fos.close();
        fis.close();
         
        return SUCCESS;
    }
 
    public String getTitle() {
        return title;
    }
 
    public void setTitle(String title) {
        this.title = title;
    }
 
 
    public File getUploadfile() {
        return uploadfile;
    }
 
    public void setUploadfile(File uploadfile) {
        this.uploadfile = uploadfile;
    }
 
    public String getUploadfileContentType() {
        return uploadfileContentType;
    }
 
    public void setUploadfileContentType(String uploadfileContentType) {
        this.uploadfileContentType = uploadfileContentType;
    }
 
    public String getUploadfileFileName() {
        return uploadfileFileName;
    }
 
    public void setUploadfileFileName(String uploadfileFileName) {
        this.uploadfileFileName = uploadfileFileName;
    }
 
    public String getSavePath() {
        return ServletActionContext.getServletContext().getRealPath(savePath);//得到绝对路径
    }
 
    public void setSavePath(String savePath) {
        this.savePath = savePath;
    }
 
}

struts.xml

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<!--?xml version="1.0" encoding="UTF-8"?-->
 
<struts>
 
    <package name="hello" namespace="/hello" extends="struts-default">
         
             
             <interceptor-ref name="fileUpload">
               <param name="allowedTypes">image/x-png,image/gif,image/jpeg
               <param name="maximumSize">20000000
            </interceptor-ref>
            <interceptor-ref name="defaultStack"></interceptor-ref>
            <param name="savePath">/uploadFiles
            <result name="success">
                /success.jsp
            </result>
            <result name="input">
                /index.jsp
            </result>
        </action>
    </package>
</struts>

 

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