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用Struts2实现文件上传
文件的上传和下载是网页开发中经常要遇到的问题，本文将结合MyEclipse+Struts2开发一个文件上传系统。
本文利用的Java组件是Commons fileUpload（commons-fileupload-1.2.1.jar）
1 文件上传：
这是实现后的页面效果图：
1.1 准备
打开MyEclipse，建立web project名为DDDemo1，右击MyEclipse→Project facets，选择struts2.x，添加Struts2组件。
注意：在选择URL pattern时必须选择【/*】，否则将无法读取struts标签，当然如果你不用struts标签就无所谓了╮(╯_╰)╭
1.2 JSP
首先是输入页面fileUploadInput.jsp，如上图所示，代码为：
1 <%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 <%@ taglib prefix = "s" uri = "/struts-tags" %> 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head>10 <title>Upload File</title>11 <s:head/>12 </head>13 14 <body>15 <s:form action = "fileUpload" enctype = "multipart/form-data" method = "post">16 <s:file name = "file" label = "File"/>17 <s:submit/>18 </s:form>19 </body>20 </html>
如果经过Action返回SUCCESS，跳转页面为fileUploadSuccess.jsp,同时显示文件名称及扩展名。
1 <%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 <%@ taglib prefix = "s" uri = "/struts-tags" %> 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head>10 <title>Upload File</title>11 <s:head/>12 </head>13 14 <body>15 <h1>File Upload Success</h1>16 File Name:<s:property value = "fileFileName"/><br/>17 File Content Type:<s:property value = "fileContentType"/>18 <s:submit value = "返回" align="left" onclick="javascript:history.go(-1);" />19 </body>20 </html>
如果失败，则跳转到fileUploadError.jsp，按键"返回"返回到之前页面
1 <%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 <%@ taglib prefix = "s" uri = "/struts-tags" %> 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head>10 <title>Upload File</title>11 <s:head/>12 </head>13 14 <body>15 <h1>File Upload Error</h1>16 <s:submit value = "返回" align="left" onclick="javascript:history.go(-1);" />17 </body>18 </html>
1.3 文件上传Action页面FileUploadAction
1 package action; 2 3 import java.io.File; 4 import java.io.FileInputStream; 5 import java.io.FileOutputStream; 6 import java.io.InputStream; 7 import java.io.OutputStream; 8 9 import com.opensymphony.xwork2.ActionSupport;10 11 public class FileUploadAction extends ActionSupport {12 13 /**14 * 15 */16 private static final long serialVersionUID = -4311773232805645652L;17 private File file;18 private String fileContentType;19 private String fileFileName;20 21 public String execute() throws Exception {22 byte[] buffer = new byte[1024];23 InputStream in = new FileInputStream(file);24 OutputStream out = new FileOutputStream(new File("f:///Test//"25 + fileFileName));26 int length = in.read(buffer);27 while (length > 0) {28 out.write(buffer);29 length = in.read(buffer);30 }31 in.close();32 out.flush();33 out.close();34 35 return SUCCESS;36 }37 38 public File getFile() {39 return file;40 }41 42 public void setFile(File file) {43 this.file = file;44 }45 46 public String getFileFileName() {47 return fileFileName;48 }49 50 public void setFileFileName(String fileFileName) {51 this.fileFileName = fileFileName;52 }53 54 public String getFileContentType() {55 return fileContentType;56 }57 58 public void setFileContentType(String fileContentType) {59 this.fileContentType = fileContentType;60 }61 62 }
1.4 struts.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> 3 <struts> 4 <package name="qian" extends="struts-default"> 5 <action name="fileUpload" class="action.FileUploadAction"> 6 <result name = "input">fileUploadError.jsp</result> 7 <result name = "success">fileUploadSuccess.jsp</result> 8 </action> 9 </package>10 </struts>
1.5 文件类型过滤
这里以图片格式为例，将struts.xml修改为：
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> 3 <struts> 4 <package name="qian" extends="struts-default"> 5 <action name="fileUpload" class="action.FileUploadAction"> 6 <interceptor-ref name="defaultStack"> 7 <!-- 设置文件类型 --> 8 <param name="fileUpload.allowedTypes"> 9 image/bmp,image/png,image/gif,image/jpeg,image/jpg 10 </param>11 <!-- 限制文件大小，这里设置10MB -->12 <param name="fileUpload.maximumSize">10485760</param>13 </interceptor-ref> 14 <result name = "input">fileUploadError.jsp</result>15 <result name = "success">fileUploadSuccess.jsp</result>16 </action>17 </package>18 </struts>
1.6 小结
对上传系统进行测试，首先输入地址，选择上传的文件：
成功界面，并在相应磁盘中找到上传的文件：
失败界面：
用Struts2实现文件上传
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