APP
?
第一點：Java代碼實現(xiàn)文件上傳
FormFile file = manform.getFile();
String newfileName =?null;
String newpathname =?null;
String fileAddre =?"/numUp";
try
{
????InputStream stream = file.getInputStream();//?把文件讀入
????String filePath = request.getRealPath(fileAddre);//取系統(tǒng)當前路徑
????File file1 =?new?File(filePath);//添加了自動創(chuàng)建目錄的功能
????((File)file1).mkdir();
????newfileName = System.currentTimeMillis()
????????+ file.getFileName().substring(
????????file.getFileName().lastIndexOf('.'));
????ByteArrayOutputStream baos =?new?ByteArrayOutputStream();
????OutputStream bos =?new?FileOutputStream(filePath +?"/"
????????+ newfileName);
????newpathname = filePath +?"/"?+ newfileName;
????System.out.println(newpathname);
????//?建立一個上傳文件的輸出流
????System.out.println(filePath +?"/"?+ file.getFileName());
????int?bytesRead = 0;
????byte[] buffer =?new?byte[8192];
????while?((bytesRead = stream.read(buffer, 0, 8192)) != -1)
????{
????????bos.write(buffer, 0, bytesRead);//?將文件寫入服務器
????}
????bos.close();
????stream.close();
}
catch?(FileNotFoundException e)
{
????e.printStackTrace();
}
catch?(IOException e)
{
????e.printStackTrace();
}
?第二點：Jsp頁面上實現(xiàn)文件上傳
package?com.vogoal.util;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Hashtable;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
?
public?class?JspFileUpload
{
????/**?request對象?*/
????private?HttpServletRequest request =?null;
????/**?上傳文件的路徑?*/
????private?String uploadPath =?null;
????/**?每次讀取得字節(jié)的大小?*/
????private?static?int BUFSIZE = 1024 * 8;
????/**?存儲參數的Hashtable?*/
????private?Hashtable paramHt =?new?Hasptable();
????/**?存儲上傳的文件的文件名的ArrayList?*/
????private?ArrayList updFileArr =?new?ArrayList();
????/**
?????*?設定request對象。
?????*
?????*?@param?request
?????*????????????HttpServletRequest?request對象
?????*/
????public?void setRequest(HttpServletRequest request) {
????????this.request = request;
????}
????/**
?????*?設定文件上傳路徑。
?????*
?????*?@param?path
?????*????????????用戶指定的文件的上傳路徑。
?????*/
????public?void setUploadPath(String path) {
????????this.uploadPath = path;
????}
文件上傳上處理程序
????/**
?????*?文件上傳處理主程序。???????B
?????*
?????*?@return?int?操作結果?0?文件操作成功；1?request對象不存在。?2?沒有設定文件保存路徑或者文件保存路徑不正確；3
?????*?????????沒有設定正確的enctype；4?文件操作異常。
?????*/
????public?int process() {
????????int status = 0;
????????//?文件上傳前，對request對象，上傳路徑以及enctype進行check。
????????status = preCheck();
????????//?出錯的時候返回錯誤代碼。
????????if?(status != 0)
????????????return?status;
????????try?{
????????????//???參數或者文件名?u??
????????????String name =?null;
????????????//?參數的value
????????????String value =?null;
????????????//?讀取的流是否為文件的標志位
????????????boolean fileFlag =?false;
????????????//?要存儲的文件。
????????????File tmpFile =?null;
????????????//?上傳的文件的名字
????????????String fName =?null;
????????????FileOutputStream baos =?null;
????????????BufferedOutputStream bos =?null;
????????????//???存儲參數的Hashtable
????????????paramHt =?new?Hashtable();
????????????updFileArr =?new?ArrayList();
????????????int rtnPos = 0;
????????????byte[] buffs =?new?byte[BUFSIZE * 8];
????????????//??取得ContentType
????????????String contentType = request.getContentType();
????????????int index = contentType.indexOf("boundary=");
????????????String boundary =?"--"?+ contentType.substring(index + 9);
????????????String endBoundary = boundary +?"--";
????????????//??從request對象中取得流。
????????????ServletInputStream sis = request.getInputStream();
????????????//?讀取1行
????????????while?((rtnPos = sis.readLine(buffs, 0, buffs.length)) != -1) {
????????????????String strBuff =?new?String(buffs, 0, rtnPos);
????????????????//?讀取1行數據?n??
????????????????if?(strBuff.startsWith(boundary)) {
????????????????????if?(name !=?null?&& name.trim().length() > 0) {
????????????????????????if?(fileFlag) {
????????????????????????????bos.flush();
????????????????????????????baos.close();
????????????????????????????bos.close();
????????????????????????????baos =?null;
????????????????????????????bos =?null;
????????????????????????????updFileArr.add(fName);
????????????????????????}?else?{
????????????????????????????Object obj = paramHt.get(name);
????????????????????????????ArrayList al =?new?ArrayList();
????????????????????????????if?(obj !=?null) {
????????????????????????????????al = (ArrayList) obj;
????????????????????????????}
????????????????????????????al.add(value);
????????????????????????????System.out.println(value);
????????????????????????????paramHt.put(name, al);
????????????????????????}
????????????????????}
????????????????????name =?new?String();
????????????????????value =?new?String();
????????????????????fileFlag =?false;
????????????????????fName =?new?String();
????????????????????rtnPos = sis.readLine(buffs, 0, buffs.length);
????????????????????if?(rtnPos != -1) {
????????????????????????strBuff =?new?String(buffs, 0, rtnPos);
????????????????????????if?(strBuff.toLowerCase().startsWith(
????????????????????????????????"content-disposition: form-data; ")) {
????????????????????????????int nIndex = strBuff.toLowerCase().indexOf(
????????????????????????????????????"name="");
????????????????????????????int nLastIndex = strBuff.toLowerCase().indexOf(
????????????????????????????????????""", nIndex + 6);
????????????????????????????name = strBuff.substring(nIndex + 6, nLastIndex);
????????????????????????}
????????????????????????int fIndex = strBuff.toLowerCase().indexOf(
????????????????????????????????"filename="");
????????????????????????if?(fIndex != -1) {
????????????????????????????fileFlag =?true;
????????????????????????????int fLastIndex = strBuff.toLowerCase().indexOf(
????????????????????????????????????""", fIndex + 10);
????????????????????????????fName = strBuff.substring(fIndex + 10, fLastIndex);
????????????????????????????fName = getFileName(fName);
????????????????????????????if?(fName ==?null?|| fName.trim().length() == 0) {
????????????????????????????????fileFlag =?false;
????????????????????????????????sis.readLine(buffs, 0, buffs.length);
????????????????????????????????sis.readLine(buffs, 0, buffs.length);
????????????????????????????????sis.readLine(buffs, 0, buffs.length);
????????????????????????????????continue;
????????????????????????????}else{
????????????????????????????????fName = getFileNameByTime(fName);
????????????????????????????????sis.readLine(buffs, 0, buffs.length);
????????????????????????????????sis.readLine(buffs, 0, buffs.length);
????????????????????????????}
????????????????????????}
????????????????????}
????????????????}?else?if?(strBuff.startsWith(endBoundary)) {
????????????????????if?(name !=?null?&& name.trim().length() > 0) {
????????????????????????if?(fileFlag) {
????????????????????????????bos.flush();
????????????????????????????baos.close();
????????????????????????????bos.close();
????????????????????????????baos =?null;
????????????????????????????bos =?null;
????????????????????????????updFileArr.add(fName);
????????????????????????}?else?{
????????????????????????????Object obj = paramHt.get(name);
????????????????????????????ArrayList al =?new?ArrayList();
????????????????????????????if?(obj !=?null) {
????????????????????????????????al = (ArrayList) obj;
????????????????????????????}
????????????????????????????al.add(value);
????????????????????????????paramHt.put(name, al);
????????????????????????}
????????????????????}
????????????????}?else?{
????????????????????if?(fileFlag) {
????????????????????????if?(baos ==?null?&& bos ==?null) {
????????????????????????????tmpFile =?new?File(uploadPath + fName);
????????????????????????????baos =?new?FileOutputStream(tmpFile);
????????????????????????????bos =?new?BufferedOutputStream(baos);
????????????????????????}
????????????????????????bos.write(buffs, 0, rtnPos);
????????????????????????baos.flush();
????????????????????}?else?{
????????????????????????System.out.println("test :"?+ value +?"--"?+ strBuff);
????????????????????????value = value + strBuff;
????????????????????}
????????????????}
????????????}
????????}?catch?(IOException e) {
????????????status = 4;
????????}
????????return?status;
????}
????private?int preCheck() {
????????int errCode = 0;
????????if?( request ==?null?)
????????????return?1;
????????if?( uploadPath ==?null?|| uploadPath.trim().length() == 0 )
????????????return?2;
????????else{
????????????File tmpF =?new?File(uploadPath);
????????????if?(!tmpF.exists())
????????????????return?2;
????????}
????????String contentType = request.getContentType();
????????if?( contentType.indexOf("multipart/form-data") == -1 )
????????????return?3;
????????return?errCode;
????}
????public?String getParameter(String name){
????????String value =?"";
????????if?( name ==?null?|| name.trim().length() == 0 )
????????????return?value;
????????value = (paramHt.get(name) ==?null)?"":(String)((ArrayList)paramHt.get(name)).get(0);
????????return?value;
????}
????public?String[] getParameters(String name){
????????if?( name ==?null?|| name.trim().length() == 0 )
????????????return?null;
????????if?( paramHt.get(name) ==?null?)
????????????return?null;
????????ArrayList al = (ArrayList)paramHt.get(name);
????????String[] strArr =?new?String[al.size()];
????????for?( int i=0;i<al.size();i++ )
????????????strArr[i] = (String)al.get(i);
????????return?strArr;
????}
???
????public?int getUpdFileSize(){
????????return?updFileArr.size();
????}
???
????public?String[] getUpdFileNames(){
????????String[] strArr =?new?String[updFileArr.size()];
????????for?( int i=0;i<updFileArr.size();i++ )
????????????strArr[i] = (String)updFileArr.get(i);
????????return?strArr;
????}
????private?String getFileName(String input){
????????int fIndex = input.lastIndexOf("\");
????????if?(fIndex == -1) {
????????????fIndex = input.lastIndexOf("/");
????????????if?(fIndex == -1) {
????????????????return?input;
????????????}
????????}
????????input = input.substring(fIndex + 1);
????????return?input;
????}
????private?String getFileNameByTime(String input){
????????int index = input.indexOf(".");
????????Date dt =?new?Date();
????????SimpleDateFormat sdf =?new?SimpleDateFormat("yyyyMMddHHmmssSSS");
????????return?input.substring(0,index) + sdf.format(dt) + input.substring(index);
????}
}
?
?
?2.在Jsp頁面中進行引用該Java類：
<%@page?import="com.vogoal.util.JspFileUpload"%>
<%
????//初始化
????JspFileUpload jfu =?new?JspFileUpload();
????//設定request對象
????jfu.setRequest(request);
????//設定上傳的文件路徑
????jfu.setUploadPath("C:\");
????//上傳處理
????int?rtn = jfu.process();
????//取得form中其他input控件參數的值
????String username = jfu.getParameter("username");
????//如果對應同一個參數有多個input控件，返回數組
????String[] usernameArr = jfu.getParameters("username");
????//取得上傳的文件的名字
????String[] fileArr = jfu.getUpdFileNames();
????//取得上傳文件的個數，這個方法有點雞肋
????int?fileNumber = jfu.getUpdFileSize();
//下面的是測試輸出的代碼。
//???????out.println("parameter:" + username);
//???????out.println("parameter size:" + usernameArr.length);
//???????out.println("fileArr size:" + fileArr.length);
//???????if (fileArr.length > 0)
//??????????????out.println("fileArr 0:" + fileArr[0]);
%>
?
第三點：struts2實現(xiàn)文件的上傳和下載
第一步：在WEB-INF/lib下加入commons-fileupload-1.2.1.jar、commons-io-1.3.2.jar。這兩個文件可以從
第二步：把form表的enctype設置為：“multipart/form-data“，如下：
Java代碼
public?class?UploadAction{?
??private?File uploadImage;?//文件?
??private?String uploadImageContentType;//文件的類型?
??private?String uploadImageFileName;//文件的名稱?
??private?String bookname;//書名?
??private?String author;//作者?
??private?String savePath;//文件的保存位置?
??//屬性的getter/setter方法?
??public?String upload()?throws?Exception{?
??//實現(xiàn)上傳代碼，I/O操作完成?
??return?"uploadSuccess";?
??}?
}
?
注：一個表單里的文件域對應Action中三個屬性，分別是文件，文件名，文件類型，命名是固定的，文件名必須表單中的文件域名稱相同（uploadImage），文件名為：文件+FileName，文件類型：文件+ContentType。
?
第四步：將我們的上傳Action配置到struts.xml中。
<action?name="upload"?class="com.gqy.UploadAction">?
??????<param?name="savePath">/uploadFile</param>?
??????<result>/success.jsp</result>??</action>
注：指定上傳文件的在服務器上的保存目錄，需要在UploadAction中為定義savePath變量并為其添加相應的setter和getter方法，便于Struts2將/uploadFile值賦給savePath屬性，即要想在UploadAction中使用savePath變量必須在UploadAction定義。
配置文件過濾類型：
<param?name="allowTypes">???????image/bmp,image/png,image/gif,image/jpeg???</param>
手動配置文件大小限制
<param?name="maximumSize"?>1048576</param>?
使用Struts2的文件上傳攔截器實現(xiàn)文件過濾
Struts2提供了一個文件上傳的攔截器—fileUpload，通過配置該攔截器可以方便實現(xiàn)上傳文件的過濾。
配置fileUpload攔截器時，可以為其指定兩個參數：
§ allowedTypes：指定允許上傳的文件類型，多個文件類型之間以英文逗號(,)隔開。
§ maximumSize：指定允許上傳的文件大小，單位是字節(jié)。
提示：通過配置fileUpload攔截器，可以輕松的實現(xiàn)文過濾，當文件過濾失敗后，系統(tǒng)自動轉入input邏輯視圖，因此必須為該Action配置名為input的邏輯視圖，除此之外，還必須顯示地為該Action配置defaultStack的攔截器引用。
使用Struts2的攔截器實現(xiàn)文件過濾配置如下：
?<action?name="uploadFileAction"?class="com.actions.UploadFileAction">?
???????????<interceptor-ref?name="defaultStack">?
??????????????<!--?配置允許上傳的文件類型，多個用","分隔?-->??????????????????
??????????????<param?name="fileUpload.allowedTypes">??????????????????????
????????????????????image/bmp,image/png,image/gif,image/jpeg,image/jpg??
????????????????????,image/x-png, image/pjpeg?
??????????????</param>?????????????????
??????????????<!--?配置允許上傳的文件大小，單位字節(jié),本例為：1MB?-->?
??????????????<param?name="fileUpload.maximumSize">1048576</param>?
??????????</interceptor-ref>?
??????????<result?name="input">/jsp/oneFileFileupload.jsp</result>?
??????????<result?name="success">/jsp/result.jsp</result>?
</action>
當用戶上傳失敗后，需要有一定的提示信息。在Struts2中，使用<s:fielderror/>標簽即可將錯誤提示信息輸出到頁面中。
注：要想使用Struts2錯誤提示信息，則上傳文件的Action類，必須繼承ActionSupport，否則Struts2不會提供輸出錯誤提示信息功能。
我們可以配置資源文件（.properties）來保存輸出給用戶的信息。
struts.messages.eror.file.too.large：當上傳文件大小超過設定的值時，Struts2將輸出該key對應的提示信息。
struts.messages.error.content.type.not.allowed：當上傳文件類型不符合設定的值時，Struts2將輸出該key對應的提示信息。
struts.messages.error.uploading：當上傳文件時出現(xiàn)未知錯誤時，Struts2將輸出該key對應的提示信息。
我們還要將資源文件配置到struts.xml文件中，接下來看看我們的資源文件，已經包含中文了，得把它進行一下轉換再配置到工程中。
在struts.xml中設定資源文件：
<constant name="struts.custom.i18n.resources" value="messages"/>或
<constant name="struts.custom.i18n.resources" value="messages_zh_CN"/>
用命令native2ascii??d:messages.properties d:messages_zh_CN.properties將原有的資源文件轉換成支持中的。
注：保持國際化，資源文件的名稱后綴為： *_zh_CN＋文件擴展名的形式。
對于多個文件上傳的原理同上，但是需要注意的是，多個文件域的name屬性名必須相同，而且在Action中應該使用File [] 或者List<File>來接收。
個人覺得用這樣的方式進行多個文件上傳不是很好。
Struts2進行文件下載:
Struts2提供了stream結果類型，該結果類型專門用于支持文件下載的功能。當指定stream結果類型時，需要配置一個inputName參數，該參數指定了一個輸入流，這個輸入流是被下載文件的入口(即通過該入口才能實現(xiàn)文件以流的方式實現(xiàn)下載)。
實現(xiàn)文件下載的Action
?????public?class?FileDownloadAction?implements?Action{?
??????????
????????????//該屬性值在配置文件中指定，Struts2會自動進行注入（即賦值），需要為該屬性提供setter和 getter方法?
????????????private?String?inputPath;//指定要下載的文件的完整路徑(路徑名＋文件名)?
????????????/*
??????????????*?實現(xiàn)下載的Action類應該提供一個返回InputStream實例的方法，該方法對應在??????
?????????????????<result.../>里的inputName屬性值為targetFile
????????????*/
????????????public?InputStream?getTargetFile()?throws?Exception{?
???????????????return??ServletActionContext.getServletContext().getResourceAsStream(inputPath);?
????????????}?
????????????//處理用戶請求的execute方法，該方法返回success字符串?
????????????public?String?execute()?throws?Exception{?
???????????????return?"success";?
????????????}
?????????@Override
?????????public?void?doIt(FSM arg0, Input arg1) {
??????????????//?TODO?Auto-generated method stub
?????????????
?????????}?
?????????}
對應Action在struts.xml文件中的配置
<action?name="download"?class="com.FileDownloadAction">
???<!--指定被下載資源的位置-->
??????<param?name="inputPath">/uploadFile/demo.txt</param>
???<!--配置結果類型為stream的結果-->
???<result?name="success"?type="stream">
???????<!--指定下載文件的文件類型-->
??????????<param?name="contentType"></param>
???????<!--指定下載文件的文件位置-->
??????????<param?name="inputName">targetFile</param>
???????<!--指定下載文件的下載方式及下載時的保存文件名，filename保存時的文件名必須有擴展名，擴展名指示了下載類型的圖標-->
??????????<param?name="contentDisposition">
????????????????attachment;filename=Struts2.txt
??????????</param>
???????<!--指定下載文件的緩沖區(qū)大小-->
??????????<param?name="bufferSize">4096</param>
???</result>
</action>
后端代碼邏輯大部分是相同的，目前能夠支持MySQL,Oracle,SQL。在使用前需要配置一下數據庫，可以參考我寫的這篇文章：
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本文摘自 ：https://www.cnblogs.com/
