struts2多图片上传实例

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本文转载自：http://blog.csdn.net/java_cxrs/article/details/6004144

描述：

通过struts2实现多图片上传。

我使用的版本是2.2.1，使用的包有如下几个：

具体实现：

1. 创建上传图片的页面

fileUpload.jsp

<%@ page language="<a href="http://lib.csdn.net/base/17" class='replace_word' title="Java EE知识库" target='_blank' style='color:#df3434; font-weight:bold;'>Java</a>" 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+"/";    %>         <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">    <html>      <head>        <base href="<%=basePath%>">                <title>My JSP 'fileUpLoad.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" mce_href="styles.css">         -->           </head>            <body>                 <center>                      <s:form action ="fileUpload" method ="POST" enctype ="multipart/form-data" >                      <s:fielderror />                      <s:file name ="myFile" label ="Image File1"/>                      <s:file name ="myFile" label ="Image File2"/>                      <s:file name ="myFile" label ="Image File3"/>                      <s:textfield name ="caption" label ="Caption" />    <s:submit/>                        </s:form>                    </center>      </body>    </html>

在FileUpload.jsp中，先将表单的提交方式设为POST，然后将enctype设为multipart/form-data，这并没有什么特别之处。接下来，<s:file/>标志将文件上传控件绑定到Action的myFile属性，因为要上传多张图片我们就暂且添加三个file

注意这三个file的name属性要相同。

2. 创建处理图片上传的action

FileUploadAction.java

package com.ywjava.action;    import java.io.BufferedInputStream;  import java.io.BufferedOutputStream;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.InputStream;  import java.io.OutputStream;  import java.util.ArrayList;  import java.util.Date;  import java.util.List;    import org.apache.struts2.ServletActionContext;    import com.opensymphony.xwork2.ActionSupport;    public class FileUploadAction extends ActionSupport {      private static final long serialVersionUID = 572146812454l;      private static final int BUFFER_SIZE = 16 * 1024;      private List<File> myFile = new ArrayList<File>();        private List<String> contentType = new ArrayList<String>();      private List<String> fileName = new ArrayList<String>();    //文件名      private List<String> imageFileName = new ArrayList<String>();      private String caption;        private static void copy(File src, File dst) {          try {              InputStream in = null;              OutputStream out = null;              try {                  in = new BufferedInputStream(new FileInputStream(src),                          BUFFER_SIZE);                  out = new BufferedOutputStream(new FileOutputStream(dst),                          BUFFER_SIZE);                  byte[] buffer = new byte[BUFFER_SIZE];                  while (in.read(buffer) > 0) {                      out.write(buffer);                  }              } finally {                  if (null != in) {                      in.close();                  }                  if (null != out) {                      out.close();                  }              }          } catch (Exception e) {              e.printStackTrace();          }      }            private static String getExtention(String fileName) {          int pos = fileName.lastIndexOf(".");          return fileName.substring(pos);      }        @Override      public String execute() {          if (myFile == null)              return INPUT;          for (int i = 0; i < myFile.size(); i++) {              imageFileName.add(new Date().getTime()+ getExtention(this.getMyFileFileName().get(i))) ;              File imageFile = new File(ServletActionContext.getServletContext()  //得到图片保存的位置(根据root来得到图片保存的路径在tomcat下的该工程里)                            .getRealPath("UploadImages")                         + "/" + imageFileName);               copy(myFile.get(i), imageFile);  //把图片写入到上面设置的路径里            }          return SUCCESS;      }          public List<File> getMyFile() {          return myFile;      }        public void setMyFile(List<File> myFile) {          this.myFile = myFile;      }        public List<String> getContentType() {          return contentType;      }        public void setContentType(List<String> contentType) {          this.contentType = contentType;      }          public List<String> getMyFileFileName() {          return fileName;      }        public void setMyFileFileName(List<String> fileName) {          this.fileName = fileName;      }          public List<String> getImageFileName() {          return imageFileName;      }        public void setImageFileName(List<String> imageFileName) {          this.imageFileName = imageFileName;      }        public String getCaption() {          return caption;      }        public void setCaption(String caption) {          this.caption = caption;      }        public static int getBufferSize() {          return BUFFER_SIZE;      }    }

在FileUploadAction中我分别写了setMyFileContentType、setMyFileFileName、setMyFile和setCaption四个Setter方法，

后两者很容易明白，分别对应FileUpload.jsp中的<s:file/>和<s:textfield/>标志。但是前两者并没有显式地与任何的页面标志绑定，

那么它们的值又是从何而来的呢？其实，<s:file/>标志不仅仅是绑定到myFile，

还有myFileContentType（上传文件的MIME类型）和myFileFileName（上传文件的文件名，该文件名不包括文件的路径）。

因此，<s:file name="xxx" />对应Action类里面的xxx、xxxContentType和xxxFileName三个属性。

FileUploadAction作用是将浏览器上传的文件拷贝到WEB应用程序的

UploadImages文件夹下，新文件的名称是由系统时间与上传文件的后缀组成，

该名称将被赋给imageFileName属性，以便上传成功的跳转页面使用。

3. 创建显示图片的页面

showUpload.jsp

<%@ 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+"/";        %>                                                                                                                                                                                                                          <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">                                              <html>                                                                                                         <head>                                                                                                         <base href="<%=basePath%>">                                                                                                                                                                                                 <title>Show Image</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" mce_href="styles.css">                                                        -->                                                                                                                                                                                                                           </head>                                                                                                                                                                                                                       <body>                                                                                                         <s:iterator value="imageFileName" status="length">                                                                                                                                                                                  <div                                                                                                                   style="padding: 3px; border: solid 1px #cccccc; text-align: center">                                                 <img src='UploadImages/<s:property value ="imageFileName" /> ' />                                                    <br />                                                                                                               <s:property value="caption" />                                                                                   </div>                                                                                                             </s:iterator>                                                                                                      <s:property value ="caption" />                                                                                                                                                                                                   </body>                                                                                                      </html>

4.Action配置文件

Struts.xml

<?xml version="1.0" encoding="UTF-8" ?>  <!DOCTYPE struts PUBLIC      "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"      "http://struts.apache.org/dtds/struts-2.0.dtd">    <struts>        <constant name="struts.enable.DynamicMethodInvocation" value="false" />      <constant name="struts.devMode" value="false" />        <!-- 指定国际化资源文件的baseName为messageResource -->      <constant name="struts.custom.i18n.resources" value="messageResource" />        <!-- 设置该应用使用的解码集 -->      <constant name="struts.i18n.encoding" value="utf-8" />        <!-- 上传的全部图片的最大限制-->      <constant name="struts.multipart.maxSize" value="1024102400" />            <!-- 临时存放文件的路径 -->      <constant name="struts.multipart.saveDir" value="d:/test" />            <package name="index" namespace="/" extends="struts-default">            <action name="index" class="com.ywjava.action.IndexAction">              <result>                  /WEB-INF/page/fileUpLoad.jsp              </result>          </action>                <action name="fileUpload" class="com.ywjava.action.FileUploadAction">              <!-- 限制图片的格式和图片的大小 -->              <interceptor-ref name="fileUpload">                  <param name="allowedTypes">                    image/bmp,image/png,image/gif,image/jpeg,image/pjpeg                  </param>              </interceptor-ref>              <!-- 默认的拦截器，必须要写 -->              <interceptor-ref name="defaultStack" />               <result name="input"> /WEB-INF/page/fileUpLoad.jsp</result>              <result name="success">/WEB-INF/page/showUpload.jsp</result>            </action>      </package>      <!--          <constant name="struts.multipart.saveDir" value="d:/test"></constant>      -->        <!-- Add packages here -->    </struts>

Action配置文件里所做的配置都有注释，不明白的地方看下注释

另外因为做了国际化处理所以需要一个国际化配置的文件

放在src目录下

5.国际化配置文件

messageResource_zh_CN.properties(只配置了中文的)

struts.messages.error.content.type.not.allowed=/u4E0A/u4F20/u7C7B/u578B/u9519/u8BEF

struts.messages.error.file.too.large=/u4E0A/u4F20/u6587/u4EF6/u592A/u5927

总结：struts2上传图片利用了fileUpload拦截器而变的简单，主要是在action中做相应处理获取文件的相应信息。

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