1. File Upload process:
Step 1: first use the <s: File> label of the form to receive uploaded files on the client, for example:
1 <% @ page Language = "Java" Import = "Java. util. * "pageencoding =" GBK "%> 2 <% @ taglib prefix =" S "uri ="/Struts-tags "%> 3 <HTML> 4Step 2: declare the three attributes in the action and declare the get and set methods.
1 filefieldname (the name must be the same as the name attribute of the <s: filr> label in the form): receives the value of wordfile in the form, that is, the actual path of the received file on the client.
Example: private file wordfile;
2 filefieldnamecontenttype: attributes of the uploaded file; example: Private string wordfilecontenttype
3 filefieldnamefilename: indicates the uploaded file name, for example, private sting wordfilefilename. For example, if the uploaded file is index. jsp, then wordfilefilename = index. jsp
Because both 2 and 3 are attributes of the uploaded file, they all carry the method defined when the <s: File> tag is uploaded.
Sample Code:
1 package com.atguigu.struts2.FileUpload.app; 2 3 import java.io.File; 4 5 import com.opensymphony.xwork2.ActionSupport; 6 7 public class TestAction extends ActionSupport { 8 9 /**10 * 11 */12 private static final long serialVersionUID = 1L;13 private File wordFile;14 private String wordFileContentTypeString;15 private String wordFileFileName;16 /**17 * @return the wordFile18 */19 public File getWordFile() {20 return wordFile;21 }22 /**23 * @param wordFile the wordFile to set24 */25 public void setWordFile(File wordFile) {26 this.wordFile = wordFile;27 }28 /**29 * @return the wordFileContentTypeString30 */31 public String getWordFileContentTypeString() {32 return wordFileContentTypeString;33 }34 /**35 * @param wordFileContentTypeString the wordFileContentTypeString to set36 */37 public void setWordFileContentTypeString(String wordFileContentTypeString) {38 this.wordFileContentTypeString = wordFileContentTypeString;39 }40 /**41 * @return the wordFileFileName42 */43 public String getWordFileFileName() {44 return wordFileFileName;45 }46 /**47 * @param wordFileFileName the wordFileFileName to set48 */49 public void setWordFileFileName(String wordFileFileName) {50 this.wordFileFileName = wordFileFileName;51 }52 public String execute() throws Exception {53 // TODO Auto-generated method stub54 return super.execute();55 }56 }File Upload? What is File Upload? Read the client file and write it into the service. Therefore, you must use the input and output streams.
Step 3: declare the input stream and output stream, and write the file to the specified server location:
1) first set the storage location of the file: servletcontext. getrealpath ("/files/" + wordfilefilename); set the file to the Files folder in the root directory,
Wordfilefilename: indicates the name of the file to be uploaded when the Files folder is put.
2) read the uploaded file and write the file to the specified location.
Fileinputstream in = new fileinputstream (PPT);/put the file into the input stream fileoutputstream out = new fileoutputstream (DIR); byte [] buffer = new byte [1024]; int Len = 0; while (LEN = in. read (buffer ))! =-1) {// read the message out of the uploaded file from the input stream. write (buffer, 0, Len); // write the uploaded file to the wordfilefilename file in the Files folder on our server}Complete sample code:
1 servletcontext = servletactioncontext. getservletcontext (); 2 string dir = servletcontext. getrealpath ("/file/" + pptfilename); 3 fileinputstream FCM = new fileinputstream (PPT); 4 fileoutputstream Fos = new fileoutputstream (DIR ); 5 byte [] buffer = new byte [1024]; // because fileinputstream is a byte stream, a byte array should be declared to store 6 int Len = 0 bytes read from the file; 7 while (LEN = Fi. read (buffer ))! =-1) {// FCM. the read () method reads the file. If the read is not complete, the system returns-1 8 Fos if the read is complete. write (buffer, 0, Len); 9} 10 FOS. close (); 11. close ();
Simple File Upload of struts2
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