struts2多图片上传实例【转】

原文地址：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="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>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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原文地址：https://www.cnblogs.com/wxy325/p/3194673.html