文件上传示例-优快云博客

1.上传文件的jsp文件代码：uploadfile.jsp

1.<%@ page contentType="text/html;charset=GBK" language="java" %> 2.<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> 3. 4.<html> 5.<head> 6.<title>一个上传文件的例子</title> 7.</head> 8.<BODY> 9.<h1>一个上传文件的例子</h1> 10.<html:errors/><br> 11.<html:form action="uploadfile.do" enctype="multipart/form-data"> 12. <html:file property="file" /><br><br> 13. <html:submit></html:submit> 14.</html:form> 15.</BODY> 16. 17.</html>

2.sucess.jsp代码：

1.<%@ page contentType="text/html;charset=GBK" language="java" %> 2.<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> 3. 4.<html> 5.<h1>上传成功...</h1><html:link forward="index">返回</html:link> 6.</html>

3.ActionForm类代码：UploadFileForm.java

4.Action类中的代码：UploadFileAction.java

1.//Created by MyEclipse Struts 2.// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_4.0.0/xslt/JavaClass.xsl 3. 4.package testfile.actions; 5. 6.import javax.servlet.http.HttpServletRequest; 7.import javax.servlet.http.HttpServletResponse; 8. 9.import org.apache.struts.action.Action; 10.import org.apache.struts.action.ActionForm; 11.import org.apache.struts.action.ActionForward; 12.import org.apache.struts.action.ActionMapping; 13.import org.apache.struts.upload.FormFile; 14.import org.apache.struts.action.ActionErrors; 15.import org.apache.struts.action.ActionError; 16.import org.apache.struts.upload.*; 17.import testfile.forms.*; 18.import java.io.*; 19. 20./** 21.* MyEclipse Struts 22.* Creation date: 11-14-2005 23.* 24.* XDoclet definition: 25.* @struts.action validate="true" 26.*/ 27.public class UploadFileAction extends Action{ 28. 29. 30.public ActionForward execute ( 31. ActionMapping mapping, 32. ActionForm form, 33. HttpServletRequest request, 34. HttpServletResponse response) throws Exception{ 35. 36. ActionErrors errors=new ActionErrors(); 37. 38. UploadFileForm hff=(UploadFileForm)form; 39. FormFile file=hff.getFile(); 40. 41. 42. //*************如果ActionForm中没验证则加上这段***************** 43. //if(file==null || file.getFileSize()<10 || file.getFileName()==null){ 44. // errors.add("file",new ActionError("error.file.null")); 45. // saveErrors(request,errors); 46. // return (new ActionForward(mapping.getInput())); 47. //} 48. 49. //*************取得上传文件的信息**************** 50. String dir=servlet.getServletContext().getRealPath("/upload"); 51. String fname=file.getFileName(); 52. String size=Integer.toString(file.getFileSize())+"bytes"; 53. String url=dir+"//"+fname; 54. 55. //*************限制非图片文件的上传******************* 56. String fileType=(fname.substring(fname.lastIndexOf('.')+1)).toLowerCase(); 57. if((!fileType.equals("jpg")) && (!fileType.equals("bmp")) && (!fileType.equals("gif")) && (!fileType.equals("jpeg"))){ 58. errors.add("filetype",new ActionError("error.file.type")); 59. saveErrors(request,errors); 60. return (new ActionForward(mapping.getInput())); 61. } 62. 63. //*************限制文件不能超过2M****************** 64. if(file.getFileSize()>2097152){ 65. errors.add("size",new ActionError("error.file.size")); 66. saveErrors(request,errors); 67. return (new ActionForward(mapping.getInput())); 68. } 69. 70. //*************要用到的输入输出流***************** 71. InputStream streamIn=file.getInputStream(); 72. OutputStream streamOut=new FileOutputStream(url); 73. 74. //*************将文件输出到目标文件***************** 75. int bytesRead=0; 76. byte[] buffer=new byte[8192]; 77. while((bytesRead=streamIn.read(buffer,0,8192))!=-1){ 78. streamOut.write(buffer,0,bytesRead); 79. } 80. 81. streamOut.close(); 82. streamIn.close(); 83. file.destroy(); 84. 85. return mapping.findForward("sucess"); 86.} 87. 88.}

5.properties文件内容：

1.error.file.size=The file is too large,the size must less than 2M ! 2. 3.error.file.null=Please choose the file! 4. 5.error.file.type=Type of the file must be ".jpg" or ".jpeg" or ".bmp" or ".gif" !

6.struts-config.xml代码：

<?xml version="1.0" encoding="UTF-8"?> 10.<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" 11. 12."http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd"> 13. 14.<struts-config> 15. 16. <form-beans > 17. <form-bean name="uploadForm" type="testfile.forms.UploadFileForm" /> 18. 19. </form-beans> 20. <global-forwards> 21. <forward name="sucess" path="/sucess.jsp" /> 22. <forward name="index" path="/uploadfile.jsp" /> 23. </global-forwards> 24. <action-mappings > 25. <action path="/uploadfile" 26. name="uploadForm" 27. scope="request" 28. input="/uploadfile.jsp" 29. type="testfile.actions.UploadFileAction" /> 30. 31. </action-mappings> 32. 33. <message-resources parameter="com.yourcompany.struts.ApplicationResources" /> 34.</struts-config>

7.web.xml代码：

1.<?xml version="1.0" encoding="UTF-8"?> 2.<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> 3. 4.<web-app> 5. <servlet> 6. <servlet-name>action</servlet-name> 7. <servlet-class>org.apache.struts.action.ActionServlet</servlet-class> 8. <init-param> 9. <param-name>config</param-name> 10. <param-value>/WEB-INF/struts-config.xml</param-value> 11. </init-param> 12. <init-param> 13. <param-name>debug</param-name> 14. <param-value>3</param-value> 15. </init-param> 16. <init-param> 17. <param-name>detail</param-name> 18. <param-value>3</param-value> 19. </init-param> 20. <load-on-startup>0</load-on-startup> 21. </servlet> 22. 23. <servlet-mapping> 24. <servlet-name>action</servlet-name> 25. <url-pattern>*.do</url-pattern> 26. </servlet-mapping> 27. 28. <welcome-file-list> 29. <welcome-file>uploadfile.jsp</welcome-file> 30. </welcome-file-list> 31. 32. <taglib> 33. <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri> 34. <taglib-location>/WEB-INF/struts-html.tld</taglib-location> 35. </taglib> 36.</web-app>

转自 http://heisetoufa.javaeye.com/