struts--CRUD优化（图片上传）

1.上传方式

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

2.web代码优化

 package com.yuan.crud.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.opensymphony.xwork2.ModelDriven;
 import com.yuan.crud.dao.ClazzDao;
 import com.yuan.crud.entity.Clazz;
 import com.yuan.crud.util.PageBean;

 public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

     private Clazz clz = new Clazz();
     private ClazzDao clzdao = new ClazzDao();
     //这里的属性名一定要和页面上name的值对应
     private File file;
     private String fileFileName;
     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) {
                 e.printStackTrace();
             }
         return "preUpload";
     }

     public String upload() {
         String realDir="D:/image";//保存路径尽量不要带中文，
         String severDir = "/upload";//读取路径
     try {
 //        FileUtils.copyFile(file, new File(realDir+"/"+fileFileName));
         copyFile(file, new File(realDir+"/"+fileFileName));
         clz.setPic(severDir+"/"+fileFileName);
         try {
             this.clzdao.edit(clz);
         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             e.printStackTrace();
         }
     } catch (IOException e) {
         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{
         try {
             BufferedInputStream in = new BufferedInputStream(new FileInputStream(source));
             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();
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         }

     }

     /**
      * 查询
      * @return
      */
     public String list() {
         PageBean pageBean = new PageBean();
         pageBean.setRequest(request);
         try {
             List<Clazz> list = this.clzdao.list(clz, pageBean);
             System.out.println(list);
             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 (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     public String edit() {
         try {
             this.clzdao.edit(clz);
         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     public String del() {
         try {
             this.clzdao.del(clz);
         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     @Override
     public Clazz getModel() {

         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;
     }

 }

3.jsp代码

3.1  clzList.jsp

 <%@ 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="/****"%>
 <!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>
 <form action="${pageContext.request.contextPath }/sy/clz_list.action" method="post">

  班级名： <input type="text" name="cname" /><input type="submit" value="确定"/>

 </form>
 <a href="${pageContext.request.contextPath }/sy/clz_preSave.action">新增</a>
 <table border="1" width="100%">
    <tr>
        <td>编号</td>
        <td>班级名</td>
        <td>教员</td>
        <td>图片</td>
        <td>操作</td>
    </tr>

    <c:forEach items="${clzList }" var="c">
      <tr>
        <td>${c.cid }</td>
        <td>${c.cname }</td>
        <td>${c.cteacher }</td>
        <td>
        <img style="height: 60px;width: 60px;" src="${pageContext.request.contextPath }${c.pic}">
        </td>
        <td>
        <a href="${pageContext.request.contextPath }/sy/clz_preSave.action?cid=${c.cid}">修改</a>&nbsp;&nbsp;&nbsp;
        <a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid}">删除</a>&nbsp;&nbsp;&nbsp;
        <a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">图片上传</a>&nbsp;&nbsp;&nbsp;
        </td>
    </tr>
    </c:forEach>
 </table>
 <z:Page pageBean="${pageBean }"></z:Page>
 </body>
 </html>

3.2  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="${pageContext.request.contextPath }/sy/clz_upload.action" method="post" enctype="multipart/form-data">
  <input type="hidden" name="cid" value="${result.cid }"/>
  <input type="hidden" name="cname" value="${result.cname }"/>
  <input type="hidden" name="cteacher" value="${result.cteacher }"/>
  <input type="file" name="file">
 <input type="submit" value="ok"/>
 </form>
 </body>
 </html>

4.配置xml

4.1  struts-sy.xml

 <?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" namespace="/sy">
       <action name="/hello_*" class="com.yuan.web.HelloAction" method="{1}">
         <result name="success">/success.jsp</result>
       </action>

       <action name="/clz_*" class="com.yuan.crud.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>

4.2  server.xml 配置（在Servers项目中找到）

在最后一个Value标签后面插入：
<Context path="/T226_struts01/upload" docBase="D:/image"/>

注：path为当前项目名下的upload文件夹，docBase为图片保存的路径

5. 页面显示

5.1 首页

5.2 上传页面

5.3 结果

谢谢观看  ^-^！！！