struts2上传

今天在使用struts2上传的过程中无意发现,struts2上传一个文件大小为0字节的文本竟然会报错FileNotFoundException,尝试了好久也没找到答案,最后只能判断文件的大小后上传,至于文件字节为0的怎么处理就看各位了

struts2上传java源码

package com.jzgx.web.action;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Result;

import com.opensymphony.xwork2.ActionSupport;

@Action(value="fileUpload",results={@Result(name="success",location="/result.jsp"),@Result(name="input",location="/error.jsp")})
public class FileUploadAction extends ActionSupport{
    
    /* 上传文件*/
    private File doc;
    /* 上传文件名称  */
    private String docFileName;
    /* 获取上传文件类型*/
    private String docContentType;

    @Override
    public String execute() throws Exception {
        try{
            //1.获得文件上传的上传目录
            String realPath=ServletActionContext.getServletContext().getRealPath("/upload");
            //2.设置保存目标文件的路径和文件名
            File target=new File(realPath+File.separator+this.getDocFileName());
            //如果doc.length()=0会出现FileNotFoundException,没想到好的解决方法,暂时先过滤掉
            if(doc.length()!=0){
                //3.copy文件内容，上传文件
                FileUtils.copyFile(doc, target);
            }
            return "success";
        }catch(Exception e){
            e.printStackTrace();
            return "error";
        }
    }
    
    public String getDocFileName() {
        return docFileName;
    }
    public void setDocFileName(String docFileName) {
        this.docFileName = docFileName;
    }

    public File getDoc() {
        return doc;
    }
    public void setDoc(File doc) {
        this.doc = doc;
    }

    public String getDocContentType() {
        return docContentType;
    }
    public void setDocContentType(String docContentType) {
        this.docContentType = docContentType;
    }
}

struts.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <!-- web应用编码字符集 采用GBK-->
    <constant name="struts.i18n.encoding" value="GBK"></constant>
    <!-- 上传文件的大小限制设成2G -->
    <constant name="struts.multipart.maxSize" value="2097152000"></constant>
</struts>