struts實現上傳篇

xuehongliang發表於2007-06-29

做了一個上傳下載的程式,還有很多地方需要改進的地方,還是先貼上來吧,以後在用到的時候做個參照:

上傳:用到struts提供的FormFile類,以及html:file標籤.在設計上傳頁面的時候有多個上傳瀏覽框.我這回用了一個土方法在頁面上進行了迴圈賦值,所以在ActionForm中FormFile定義成陣列,不知道還有沒有更好的方法.

java 程式碼
  1. public class UploadAction extends Action {
  3. public ActionForward execute(ActionMapping mapping, ActionForm form,
  4. HttpServletRequest request, HttpServletResponse response)
  5. throws Exception {
  7. int totalFileSize = 0;
  8. List list = new ArrayList();
  9. // 在web.xml中讀取系統上傳預設路徑
  10. String path = servlet.getInitParameter("file-upload");
  11. // 獲取頁面資訊,得到上傳檔案的相關資訊.
  12. UploadForm upform = (UploadForm) form;
  13. // FormFile是struts提供的處理上傳的類
  14. FormFile[] file = upform.getFile();
  15. for (int i = 0; i < file.length; i++) {
  16. // 取得上傳檔案的檔名.
  17. String fileName = file[i].getFileName();
  18. // 取得上傳檔案的大小,轉成字串型別的目的是為了在頁面上顯示檔案大小.
  19. String size = file[i].getFileSize()+"";
  21. totalFileSize += file[i].getFileSize();
  22. if (fileName.equals("") || fileName.equals(null)) {
  23. request.setAttribute("total",totalFileSize);
  24. request.setAttribute("filearraylist",list);
  25. return mapping.findForward("success");
  26. } else {
  27. // 主要方法,上傳檔案
  28. uploadFile(file[i], path, fileName, size, upform, request);
  30. FileInfo fi = new FileInfo();
  31. fi.setFileName(fileName);
  32. fi.setFileSize(size);
  34. list.add(fi);
  36. // 上傳成功後彈出上傳成功對話方塊,在這裡加一個標誌,在頁面進行判斷用.
  37. request.setAttribute("flags", true);
  39. // 取得檔案上傳路徑
  40. File fileList = new File(path);
  41. // 取得所有檔名
  42. String[] files = fileList.list();
  43. // 將檔名放入request範圍在頁面顯示用.
  44. request.setAttribute("fileList", files);
  45. }
  46. }
  47. request.setAttribute("total",totalFileSize);
  48. request.setAttribute("filearraylist",list);
  49. return mapping.findForward("success");
  50. }
  52. private void uploadFile(FormFile file, String path, String fileName,
  53. String size, UploadForm upform, HttpServletRequest request) {
  54. try {
  55. InputStream is = file.getInputStream();
  56. OutputStream os = new FileOutputStream(path + "/" + fileName);
  57. // 檔案大小
  58. byte[] buffer = new byte[20480];
  59. while ((is.read(buffer, 0, buffer.length)) != -1) {
  60. os.write(buffer, 0, buffer.length);
  61. }
  62. os.flush();
  63. file.destroy();
  64. // 關閉流
  65. close(is, os);
  66. } catch (FileNotFoundException e) {
  67. e.printStackTrace();
  68. } catch (IOException e) {
  69. e.printStackTrace();
  70. }
  71. }
  73. private void close(InputStream is, OutputStream os) throws IOException {
  74. is.close();
  75. os.close();
  76. }
  78. }
  80. public class UploadForm extends ActionForm {
  82. private FormFile[] file = new FormFile[4];
  84. private String fileName;
  86. private String size;
  88. public FormFile[] getFile() {
  89. return file;
  90. }
  92. public void setFile(FormFile[] file) {
  93. this.file = file;
  94. }
  96. public String getFileName() {
  97. return fileName;
  98. }
  100. public void setFileName(String fileName) {
  101. this.fileName = fileName;
  102. }
  104. public String getSize() {
  105. return size;
  106. }
  108. public void setSize(String size) {
  109. this.size = size;
  110. }
  112. }

upload頁面:

jsp 程式碼
  1. <%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
  2. <%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
  3. <%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>
  5. <%@ page language="java" contentType="text/html; charset=GB2312"%>
  7. <logic:present name="flags">
  8. <script language="javascript" >alert("上傳成功!")script>
  9. logic:present>
  10. <html:html>
  11. <head>
  12. <title>test struts upload filetitle>
  13. head>
  14. <body>
  15. <html:errors/>
  16. <html:messages id="messages" message="true">
  17. <LI><bean:write name="messages" />LI>
  18. html:messages>
  19. <html:form action="upload" enctype="multipart/form-data">
  20. <table cellpadding="0" cellspacing="0" border="0" >
  21. <tr>
  22. <td>
  23. <table height="80%" width="80%">
  24. <tr>
  25. <td bgcolor="#ddcc">
  26. 選擇檔案
  27. td>
  28. tr>
  29. table>
  30. td>
  31. tr>
  32. <tr height="50">
  33. <td width=2%>
  34. <table height="80%" width="80%" cellpadding="0" cellspacing="0" border="0">
  35. <tr>
  36. <% for(int i=0;i<4;i++){%>
  37. <td>
  38. <html:file property='' />
  39. td>
  40. <%
  41. }
  42. %>
  43. tr>
  44. table>
  45. td>
  46. tr>
  47. <tr>
  48. <td>
  49. <html:submit onclick="return(confirm('你確認要上傳檔案嗎?'))">上傳檔案html:submit>
  50. td>
  51. tr>
  52. <tr>
  53. <td>
  54. <table height="80%" width="80%">
  55. <tr bgcolor="#ddcc">
  56. <td width="50%">檔名td>
  57. <td width="50%">檔案大小(byte)td>
  58. tr>
  59. <tr>
  60. <logic:empty name="filearraylist" scope="request">
  61. <tr><td width="50%">總計td><td width="50%">0td>tr>
  62. logic:empty>
  63. <logic:notEmpty name="filearraylist" scope="request">
  64. <logic:iterate id="element" name="filearraylist" scope="request">
  65. <tr>
  66. <td width="50%"><bean:write name="element" property="fileName" />td>
  67. <td width="50%"><bean:write name="element" property="fileSize" />td>
  68. tr>
  69. logic:iterate>
  70. <tr><td>總計td><td><bean:write name="total"/>td>tr>
  71. logic:notEmpty>
  72. tr>
  73. table>
  74. td>
  75. tr>
  76. table>
  77. html:form>
  78. <br/><br/><br/>
  79. <%int i=0;%>
  80. <logic:notEmpty name="fileList" scope="request">
  81. <table cellpadding="0" cellspacing="0" border="0">
  82. <tr>
  83. <td>
  84. <logic:iterate id="element" name="fileList" scope="request">
  85. <%= ++i%>
  86. <a href="?filename=">

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