struts文件上传

文件上传的三种方案：

1、上传到tomcat服务器（上传图片的存放位置与tomcat服务器的耦合度太高，会导致系列的问题）

2、在数据库表中建立二进制字段，将图片存储到数据库（会导致数据库的表数据量过大）

3、上传到指定文件目录，添加服务器与真实目录的映射关系，从而解耦上传文件与tomcat的关系
文件服务器

由于前两种方法都存在比较大的缺陷，日渐被淘汰，我为大家展示第三种上传方法：

在上次struts项目的基础上完善主界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="z" uri="/myjstl"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <h2>小说目录</h2>
    <br>

    <form action="${pageContext.request.contextPath}/sy/clz_list.action"
        method="post">
        书名：<input type="text" name="bname"> <input type="submit"
            value="确定">
    </form>
    <a href="${pageContext.request.contextPath}/sy/clz_preSave.action">增加</a>
    <table border="1" width="100%">
        <tr>
            <td>编号</td>
            <td>班级名称</td>
            <td>老师</td>
            <td>班级图片</td>
        </tr>
        <c:forEach items="${clzList }" var="b">
            <tr>
                <td>${b.cid }</td>
                <td>${b.cname }</td>
                <td>${b.cteacher }</td>
                <td>
                    <img style="height: 80px; 50px" src="${pageContext.request.contextPath}${b.pic}">
                </td>
                <td><a
                    href="${pageContext.request.contextPath}/sy/clz_preSave.action?cid=${b.cid}">修改</a>&nbsp;&nbsp;
                    <a
                    href="${pageContext.request.contextPath}/sy/clz_del.action?cid=${b.cid}">删除</a>&nbsp;
                    <a
                    href="${pageContext.request.contextPath}/sy/clz_preUpload.action?cid=${b.cid}">图片上传</a>&nbsp;
                </td>
            </tr>
        </c:forEach>
    </table>
    <z:page pageBean="${pageBean }"></z:page>
</body>
</html>

添加上传页面clzUpload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>图片上传</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/sy/clz_upload.action" method="post" enctype="multipart/form-data">
  <input type="hidden" value="${result.cid }" name="cid"><br>
  <input type="hidden" value="${result.cname }" name="cname"><br>
  <input type="hidden" value="${result.cteacher }" name="cteacher"><br>
  <input type="file" name="file">
   <input type="submit" value="ok">
</form>
</body>
</html>

配置struts-sy.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
    <package name="sy" extends="base" >
    
    <action name="/hello_*" class="com.temp.HelloAction" method="{1}">
      <result name="success">/success.jsp</result>
    </action>
    <action name="/clz_*" class="com.web.ClazzAction" method="{1}">
      <result name="list">/clzList.jsp</result>
      <result name="preSave">/clzEdit.jsp</result>
      <result name="preUpload">/clzUpload.jsp</result>
      <result name="toList" type="redirectAction">/clz_list</result>
    </action>
    </package>
</struts>

创建ClazzAction.java

package com.web;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.io.FileUtils;

import com.dao.ClazzDao;
import com.entity.Clazz;
import com.util.BaseAction;
import com.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;

public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

    private Clazz clz=new Clazz();
    private ClazzDao clzDao=new ClazzDao();
    //这里的属性名要和name对应
    private File file;
    //xxxFileName
    private String fileFileName;
    //xxxContentType
    private String fileContentType;
    /**
     * 跳转上传图片的界面
     * @return
     */
    public String preUpload() {
            try {
                this.result= this.clzDao.list(clz, null).get(0);
                
            } catch (InstantiationException | IllegalAccessException | SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        return "preUpload";
        
    }
    
    public String upload() {
        String realDir="D:/myimg";
        String severDir="/upload";
        try {
            FileUtils.copyFile(file, new File(realDir+"/"+fileFileName));
            //copyFile(file,new File(realDir+"/"+fileFileName));
            clz.setPic(severDir+"/"+fileFileName);
            try {
                this.clzDao.edit(clz);
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";
    
}
    /**
     * 利用缓冲流技术进行拷贝
     * @param source
     * @param target
     * @throws IOException 
     */
    public void copyFile(File source,File target) throws IOException {
        BufferedInputStream in=new BufferedInputStream(new FileInputStream(file));
        BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(target));
        byte[] bbuf=new byte[1024];
        int len=0;
        while((len=in.read(bbuf))!=-1) {
            out.write(bbuf,0,len);
        }
        in.close();
        out.close();
    }
    public String list(){
        PageBean pageBean =new PageBean();
        pageBean.setRequest(request);
        try {
            List<Clazz> list = this.clzDao.list(clz, pageBean);
            request.setAttribute("clzList",list);
            request.setAttribute("pageBean",pageBean);
        } catch (InstantiationException | IllegalAccessException | SQLException e) {
             // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "list";
        
    }
    /**
     * 跳转编辑页面 （新增修改页面）
     * @return
     */
    public String preSave() {
        if(clz.getCid()!=0) {
            try {
                this.result= this.clzDao.list(clz, null).get(0);
                
            } catch (InstantiationException | IllegalAccessException | SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return "preSave";
        
    }
    public String add() {
        try {
            this.code= this.clzDao.add(clz);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
                | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";
        
    }
    public String edit() {
        try {
            this.clzDao.edit(clz);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
                | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";
        
    }
    public String del() {
        try {
            this.clzDao.del(clz);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
                | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";
        
    }

    @Override
    public Clazz getModel() {
        // TODO Auto-generated method stub
        return clz;
    }
    public File getFile() {
        return file;
    }
    public void setFile(File file) {
        this.file = file;
    }
    public String getFileFileName() {
        return fileFileName;
    }
    public void setFileFileName(String fileFileName) {
        this.fileFileName = fileFileName;
    }
    public String getFileContentType() {
        return fileContentType;
    }
    public void setFileContentType(String fileContentType) {
        this.fileContentType = fileContentType;
    }
    
}

然后配置Servers中的serser.xml文件

效果如下：

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原文地址：https://www.cnblogs.com/huxiaocong/p/11285976.html