Struts2手动实现文件上传过滤

太过爱你忘了你带给我的痛 2021-07-24 19:33 330阅读 0赞

**一 视图**

1 uploadForm.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>利用输入校验完成文件过滤</title>
        <s:head/>
    </head>
    <body>
    <s:fielderror/>
    <s:form action="upload"
        enctype="multipart/form-data">
        <s:textfield name="title" label="文件标题"/>
        <s:file name="upload" label="选择文件"/>
        <s:submit value="上传"/>
    </s:form>
    </body>
    </html>

2 succ.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>上传成功</title>
    </head>
    <body>
        上传成功!<br/>
        文件标题:<s:property value=" + title"/><br/>
        文件为：<img src="<s:property value="'uploadFiles/'
            + uploadFileName"/>"/><br/>
    </body>
    </html>

**二 配置文件**

<?xml version="1.0" encoding="GBK"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
        
        <constant name="struts.i18n.encoding" value="GBK"/>
        <package name="lee" extends="struts-default">
        
        <action name="upload" class="org.crazyit.app.action.UploadAction">
            
            <param name="savePath">/uploadFiles</param>
            
            <param name="allowTypes">image/png,image/gif,image/jpeg</param>
            <result name="input">/WEB-INF/content/uploadForm.jsp</result>
            
            <result>/WEB-INF/content/succ.jsp</result>
        </action>
            <action name="*">
                <result>/WEB-INF/content/{1}.jsp</result>
            </action>
        </package>
    </struts>

**三 action**

package org.crazyit.app.action;
    
    import com.opensymphony.xwork2.Action;
    import com.opensymphony.xwork2.ActionSupport;
    import org.apache.struts2.ServletActionContext;
    
    import java.io.File;
    import java.io.*;
    
    
    
    public class UploadAction extends ActionSupport
    {
        // 封装文件标题请求参数的属性
        private String title;
        // 封装上传文件域的属性
        private File upload;
        // 封装上传文件类型的属性
        private String uploadContentType;
        // 封装上传文件名的属性
        private String uploadFileName;
        // 直接在struts.xml文件中配置的属性
        private String savePath;
        // 定义该Action允许上传的文件类型
        private String allowTypes;
        // allowTypes的setter和getter方法
        public String getAllowTypes()
        {
            return allowTypes;
        }
        public void setAllowTypes(String allowTypes)
        {
            this.allowTypes = allowTypes;
        }
    
        // 接受struts.xml文件配置值的方法
        public void setSavePath(String value)
        {
            this.savePath = value;
        }
        // 获取上传文件的保存位置
        private String getSavePath() throws Exception
        {
            return ServletActionContext.getServletContext()
                .getRealPath(savePath);
        }
    
        // title的setter和getter方法
        public void setTitle(String title)
        {
            this.title = title;
        }
        public String getTitle()
        {
            return (this.title);
        }
    
        // upload的setter和getter方法
        public void setUpload(File upload)
        {
            this.upload = upload;
        }
        public File getUpload()
        {
            return (this.upload);
        }
    
        // uploadContentType的setter和getter方法
        public void setUploadContentType(String uploadContentType)
        {
            this.uploadContentType = uploadContentType;
        }
        public String getUploadContentType()
        {
            return (this.uploadContentType);
        }
    
        // uploadFileName的setter和getter方法
        public void setUploadFileName(String uploadFileName)
        {
            this.uploadFileName = uploadFileName;
        }
        public String getUploadFileName()
        {
            return (this.uploadFileName);
        }
    
        @Override
        public String execute() throws Exception
        {
            // 以服务器的文件保存地址和原文件名建立上传文件输出流
            FileOutputStream fos = new FileOutputStream(getSavePath()
                + "\\" + getUploadFileName());
            FileInputStream fis = new FileInputStream(getUpload());
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = fis.read(buffer)) > 0)
            {
                fos.write(buffer , 0 , len);
            }
            fos.close();
            return SUCCESS;
        }
    
        /**
         * 过滤文件类型
         * @param types 系统所有允许上传的文件类型
         * @return 如果上传文件的文件类型允许上传，返回null
         *           否则返回error字符串
         */
        public String filterTypes(String[] types)
        {
            // 获取允许上传的所有文件类型
            String fileType = getUploadContentType();
            for (String type : types)
            {
                if (type.equals(fileType))
                {
                    return null;
                }
            }
            return ERROR;
        }
    
    // 执行输入校验
    public void validate()
    {
        // 将允许上传文件类型的字符串以英文逗号（,）
        // 分解成字符串数组从而判断当前文件类型是否允许上传
        String filterResult = filterTypes(getAllowTypes().split(","));
        // 如果当前文件类型不允许上传
        if (filterResult != null)
        {
            // 添加FieldError
            addFieldError("upload" , "您要上传的文件类型不正确！");
        }
    }
    }

**四 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/0ac1c3916d09454ea1bc25771e7d224d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/44d68cb89e754800a5baa9637434a02d.png