- 現在jsp(SUN企業級應用的首選)被越來越多的人應用在後臺程序的開發及動態網頁的製作上了,今天就來介紹一下如何用jsp(SUN企業級應用的首選)來實現文件的上傳。
- 搞了幾天,在網上查了不少資料,終於把上傳功能解決了。程序如下:
- package linkman.helper;
- import java.io.*;
- import java.util.*;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.servlet.ServletInputStream;
- public class UpLoadBean {
- private String SavePath = null;
- private String FileName = null;
- private String Sperator = null;
- private String ErrMsg = "正常返回";
- private byte[] bt = new byte[4096];
- private byte[] prebt = new byte[4096];
- private int t = -1;
- private long FileSize = -1;
- private boolean UserDefineFileName = false;
- /////////////////////////////////////////////////
- public UpLoadBean () {
- FileName = bringFileName ();
- }
- public UpLoadBean (String savepath) {
- SavePath = savepath;
- FileName = bringFileName ();
- }
- /////////////////////////////////////////////////
- // 文件名信息
- private String bringFileName () {
- Calendar dt = Calendar.getInstance ();
- String str = "" + dt.get (Calendar.YEAR) + dt.get (Calendar.MONTH) + dt.get (Calendar.DAY_OF_MONTH);
- str = str + dt.get (Calendar.HOUR) + dt.get (Calendar.MINUTE) + dt.get (Calendar.SECOND);
- return str;
- }
- public void setFileName (String filename) {
- FileName = filename;
- UserDefineFileName = true;
- }
- public String getFileName () {
- return FileName;
- }
- /////////////////////////////////////////////////
- // 上傳文件主程序
- public boolean UpLoad (HttpServletRequest request) throws Exception {
- if (SavePath == null) {
- setErrorMessage ("未設置保存上傳文件的路徑");
- return false;
- }
- request.setCharacterEncoding("utf-8");
- ServletInputStream in = request.getInputStream ();
- ////////////////////////////////////////////
- // 獲取得一行的分隔標誌
- t = in.readLine (bt, 0, bt.length);
- if (t != -1) {
- Sperator = new String (bt, 0, t);
- Sperator = Sperator.substring (0, 28);
- t = -1;
- }
- ////////////////////////////////////////////
- // 取擴展名並設定文件全名
- do {
- t = in.readLine (bt, 0, bt.length);
- String s = new String (bt, 0, t);
- int index = s.indexOf ("filename=/"");
- if (index != -1) {
- s = s.substring (index + 10);
- index = s.indexOf ("/"");
- s = s.substring (0, index);
- index = s.lastIndexOf (".");
- if (!UserDefineFileName) {
- FileName = FileName + s.substring (index); // 設定文件全名
- }
- t = -1;
- }
- } while (t != -1);
- ////////////////////////////////////////////
- // 取文件內容
- FileOutputStream out = new FileOutputStream (SavePath + "//" + FileName);
- t = in.readLine (bt, 0, bt.length);
- String s = new String (bt, 0, t);
- int i = s.indexOf ("Content-Type:");
- if (i == -1) {
- setErrorMessage ("上傳的不是文件");
- return false;
- } else {
- in.readLine (bt, 0, bt.length); // 去掉一個空行
- t = -1;
- }
- boolean state = true;
- long trancsize = 0;
- try {
- t = in.readLine (bt, 0, bt.length);
- while (t != -1) {
- s = new String (bt, 0, t);
- if (s.length () > 28) {
- s = s.substring (0, 28);
- if (s.equals (Sperator)) {
- break;
- }
- }
- /*
- if (bt[0] == 45 && bt[1] == 45 && bt[2] == 45 && bt[3] == 45 && bt[4] == 45) {
- break;
- }
- */
- if (FileSize != -1) {
- if (trancsize >= FileSize) {
- throw new Exception ("上傳文件太大");
- }
- }
- out.write (bt, 0, t);
- trancsize += t;
- t = in.readLine (bt, 0, bt.length);
- }
- } catch (Exception e) {
- state = false;
- out.close ();
- setErrorMessage (e.getMessage ());
- File tmp = new File (SavePath, FileName);
- if (!tmp.delete()) {
- setErrorMessage (e.getMessage () + ",清除未完成");
- }
- } finally {
- if (state) {
- out.close ();
- }
- return state;
- }
- }
- /////////////////////////////////////////////////
- // 上傳文件錯誤信息
- public void setErrorMessage (String errormessage) {
- ErrMsg = errormessage;
- }
- public String getErrorMessage () {
- return ErrMsg;
- }
- /////////////////////////////////////////////////
- // 文件大小信息
- public void setFileSize (long size) {
- FileSize = size;
- }
- public long getFileSize () {
- return FileSize;
- }
- }// end class
JSP上傳文件輕鬆實現
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