❶ java上傳圖片
/**
*
*/
package net.hlj.chOA.action;
import java.io.File;
import java.io.UnsupportedEncodingException;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.hlj.chOA..DangAnDao;
import net.hlj.chOA..LogDao;
import net.hlj.chOA..ZiYuanDao;
import net.hlj.chOA.model.DangAn;
import net.hlj.chOA.model.User;
import net.hlj.chOA.model.ZiYuan;
import net.hlj.chOA.util.GetId;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
/**
* @author lcy
*
*/
public class ZiYuanAction extends DispatchAction {
public ActionForward addZiYuan(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
String title = "";
String fileupload="";
SimpleDateFormat fmt = new SimpleDateFormat("yyMMddhhssmmSSS");
Date now = new Date();
String date = fmt.format(now);
String filePath = request.getSession().getServletContext().getRealPath(
"/");
String uploadPath = filePath + "upload\\uploadZiYuan\\";
String tempPath = filePath + "upload\\uploadZiYuan\\" + "uploadTemp";
String suffix = null;
if (!new File(uploadPath).isDirectory()) {
new File(uploadPath).mkdirs();
}
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(4194304);// 設置初始化內存，如果上傳的文件超過該大小，將不保存到內存，而且硬碟中(單位：byte)
File fileTemp = new File(tempPath);// 建立臨時目錄
fileTemp.mkdir();
factory.setRepository(fileTemp);
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(4194304);// 設置客戶端最大上傳，-1為無限大（單位：byte）
try {
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> i = items.iterator();
String[] rightType = {".gif", ".jpeg", ".doc", ".xls",
".pdf", ".txt", ".rar" };
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (fi.isFormField()) {
try {
if (fi.getFieldName().equals("title")) {
title = fi.getString("UTF-8");
}
} catch (UnsupportedEncodingException e) {
log.error(e.getMessage(), e);
}
} else {
String fileName = fi.getName();
int l = fileName.length();
if (!fileName.equals("")) {
int pos = fileName.lastIndexOf(".");
// suffix = fileName.substring(l - 4, l);
suffix = fileName.substring(pos, l);
boolean result = false;
String ext = fileName.substring(fileName
.lastIndexOf("."));
for (int j = 0; j < rightType.length; j++) {
if (ext.toLowerCase().equals(rightType[j])) {
result = true;
break;
}
}
if (!result) {
request.setAttribute("error", "上傳文件類型有誤！");
return mapping.findForward("addZiyuan");
}
// if (!suffix.equalsIgnoreCase(".jpg") &&
// !suffix.equalsIgnoreCase(".gif")
// && !suffix.equalsIgnoreCase(".png") &&
// !suffix.equalsIgnoreCase(".bmp")) {
// request.setAttribute("message", "上傳文件類型有誤！");
// return mapping.findForward("danganList");
// }
if (fileName != null) {
File savedFile = new File(uploadPath, date + suffix);
try {
fi.write(savedFile);
fileupload = "upload/uploadZiYuan/" + date
+ suffix;
} catch (Exception e) {
log.error(e.getMessage(), e);
}
}
}
}
}
} catch (FileUploadException e) {
log.error(e.getMessage(), e);
}
ZiYuan zy=new ZiYuan();
zy.setTitle(title);
zy.setUpload(fileupload);
ZiYuanDao zyDao=new ZiYuanDao();
try {
zyDao.addZiYuan(zy, this.servlet.getServletContext());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
LogDao lDao=new LogDao();
//刪除操做添加日誌 isDel 0是增加，1是刪除，2是修改,3是審批
User user1 =(User)request.getSession().getAttribute("userBean");
String ip=request.getLocalAddr();
int id=GetId.getId("ziyuan", this.servlet.getServletContext());
try {
lDao.addLogMe("ziyuan", id , ip, user1.getName(), user1.getId(), 0, this.servlet.getServletContext());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mapping.findForward("ziyuanList");
}
public ActionForward deleteZiYuan(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
String[] ids= request.getParameterValues("id");
ZiYuanDao zyDao=new ZiYuanDao();
LogDao lDao=new LogDao();
for(int i=0;i<ids.length;i++){
try {
zyDao.deleteZiYuan(Integer.parseInt(ids[i]), this.servlet.getServletContext());
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
User user =(User)request.getSession().getAttribute("userBean");
String ip=request.getLocalAddr();
try {
lDao.addLogMe("tbl_users",Integer.parseInt(ids[i]), ip, user.getName(), user.getId(), 1, this.servlet.getServletContext());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return mapping.findForward("ziyuanList");
}
public ActionForward updateZiYuan(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws NumberFormatException, SQLException {
String id="";
String title = "";
String fileupload="";
SimpleDateFormat fmt = new SimpleDateFormat("yyMMddhhssmmSSS");
Date now = new Date();
String date = fmt.format(now);
String filePath = request.getSession().getServletContext().getRealPath(
"/");
String uploadPath = filePath + "upload\\uploadZiYuan\\";
String tempPath = filePath + "upload\\uploadZiYuan\\" + "uploadTemp";
String suffix = null;
if (!new File(uploadPath).isDirectory()) {
new File(uploadPath).mkdirs();
}
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(4194304);// 設置初始化內存，如果上傳的文件超過該大小，將不保存到內存，而且硬碟中(單位：byte)
File fileTemp = new File(tempPath);// 建立臨時目錄
fileTemp.mkdir();
factory.setRepository(fileTemp);
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(4194304);// 設置客戶端最大上傳，-1為無限大（單位：byte）
try {
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> i = items.iterator();
String[] rightType = {".gif", ".jpeg", ".doc", ".xls",
".pdf", ".txt", ".rar" };
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (fi.isFormField()) {
try {
if (fi.getFieldName().equals("title")) {
title = fi.getString("UTF-8");
}
if (fi.getFieldName().equals("id")) {
id = fi.getString("UTF-8");
}
} catch (UnsupportedEncodingException e) {
log.error(e.getMessage(), e);
}
} else {
String fileName = fi.getName();
int l = fileName.length();
if (!fileName.equals("")) {
int pos = fileName.lastIndexOf(".");
// suffix = fileName.substring(l - 4, l);
suffix = fileName.substring(pos, l);
boolean result = false;
String ext = fileName.substring(fileName
.lastIndexOf("."));
for (int j = 0; j < rightType.length; j++) {
if (ext.toLowerCase().equals(rightType[j])) {
result = true;
break;
}
}
if (!result) {
request.setAttribute("error", "上傳文件類型有誤！");
request.setAttribute("id", id);
return mapping.findForward("selectZiyuan");
}
// if (!suffix.equalsIgnoreCase(".jpg") &&
// !suffix.equalsIgnoreCase(".gif")
// && !suffix.equalsIgnoreCase(".png") &&
// !suffix.equalsIgnoreCase(".bmp")) {
// request.setAttribute("message", "上傳文件類型有誤！");
// return mapping.findForward("danganList");
// }
if (fileName != null) {
File savedFile = new File(uploadPath, date + suffix);
try {
fi.write(savedFile);
fileupload = "upload/uploadZiYuan/" + date
+ suffix;
} catch (Exception e) {
log.error(e.getMessage(), e);
}
}
}else{
//這里寫如果用戶沒有重寫添加附件則保持原來的附件
ZiYuanDao zyDao = new ZiYuanDao();
ZiYuan zy=(ZiYuan)zyDao.selectZiYuanById(Integer.parseInt(id), this.servlet.getServletContext()).get(0);
fileupload=zy.getUpload();
}
}
}
} catch (FileUploadException e) {
log.error(e.getMessage(), e);
}
ZiYuan zy=new ZiYuan();
zy.setId(Integer.parseInt(id));
zy.setTitle(title);
zy.setUpload(fileupload);
ZiYuanDao zyDao=new ZiYuanDao();
try {
zyDao.updateZiYuan(zy, this.servlet.getServletContext());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
LogDao lDao=new LogDao();
//刪除操做添加日誌 isDel 0是增加，1是刪除，2是修改,3是審批
User user1 =(User)request.getSession().getAttribute("userBean");
String ip=request.getLocalAddr();
try {
lDao.addLogMe("ziyuan", Integer.parseInt(id) , ip, user1.getName(), user1.getId(), 2, this.servlet.getServletContext());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mapping.findForward("ziyuanList");
}
}
❷ 怎麼用Java實現圖片上傳
下面這是servlet的內容：
package demo;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class DemoServlet extends HttpServlet {
private static final String UPLOAD_DIRECTORY = "upload";
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
DiskFileItemFactory factory=new DiskFileItemFactory();
ServletFileUpload sfu=new ServletFileUpload(factory);
sfu.setHeaderEncoding("UTF-8");
sfu.setProgressListener(new ProgressListener() {
public void update(long pBytesRead, long pContentLength, int pItems) {
System.out.println("文件大小為："+pContentLength+",當前已處理："+pBytesRead);
}
});
//判斷提交上來的數據是否是上傳表單的數據
if(!ServletFileUpload.isMultipartContent(request)){
PrintWriter writer= response.getWriter();
writer.println("Error:表單必須包含 enctype=multipart/form-data");
writer.flush();
return;
}
factory.setSizeThreshold(MEMORY_THRESHOLD);
//設置臨時儲存目錄
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
//設置最大文件上傳值
sfu.setFileSizeMax(MAX_FILE_SIZE);
//設置最大請求值（包含文件和表單數據）
sfu.setSizeMax(MAX_REQUEST_SIZE);
String uploadpath=getServletContext().getRealPath("./")+ File.separator+UPLOAD_DIRECTORY;
File file=new File(uploadpath);
if(!file.exists()){
file.mkdir();
}
try {
List<FileItem> formItems = sfu.parseRequest(request);
if(formItems!=null&&formItems.size()>0){
for(FileItem item:formItems){
if(!item.isFormField()){
String fileName=new File(item.getName()).getName();
String filePath=uploadpath+File.separator+fileName;
File storeFile=new File(filePath);
System.out.println(filePath);
item.write(storeFile);
request.setAttribute("message", "文件上傳成功！");
}
}
}
} catch (Exception e) {
request.setAttribute("message", "錯誤信息："+e.getMessage());
}
getServletContext().getRequestDispatcher("/demo.jsp").forward(request, response);
}
}
下面是jsp的內容，jsp放到webapp下，如果想放到WEB-INF下就把servlet里轉發的路徑改一下：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="demo.do" enctype="multipart/form-data" method="post">
<input type="file" name="file1" />
<%
String message = (String) request.getAttribute("message");
%>
<%=message%>
<input type="submit" value="提交"/>
</form>
</body>
</html>
這段代碼可以實現普通的文件上傳，有大小限制，上傳普通的圖片肯定沒問題，別的一些小的文件也能傳
❸ 請問用Java 如何實現圖片上傳功能
自己寫程序來上傳位元組流文件很難的，用SmartUpload.jar包吧，專門用於JSP上傳下載的，唯一缺點就是中文支持不太好，不過你可以改一下原程序的字元集就行了。上網搜，沒有找我！我給你發
❹ java實現圖片上傳至伺服器並顯示，如何做希望要具體的代碼實現
很簡單。
可以手寫IO讀寫（有點麻煩）。
怕麻煩的話使用FileUpload組件 在servlet里doPost嵌入一下代碼
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
response.setContentType("text/html;charset=gb2312");
PrintWriter out=response.getWriter();
//設置保存上傳文件的目錄
String uploadDir =getServletContext().getRealPath("/up");
System.out.println(uploadDir);
if (uploadDir == null)
{
out.println("無法訪問存儲目錄！");
return;
}
//根據路徑創建一個文件
File fUploadDir = new File(uploadDir);
if(!fUploadDir.exists()){
if(!fUploadDir.mkdir())//如果UP目錄不存在 創建一個 不能創建輸出...
{
out.println("無法創建存儲目錄!");
return;
}
}
if (!DiskFileUpload.isMultipartContent(request))
{
out.println("只能處理multipart/form-data類型的數據!");
return ;
}
DiskFileUpload fu = new DiskFileUpload();
//最多上傳200M數據
fu.setSizeMax(1024 * 1024 * 200);
//超過1M的欄位數據採用臨時文件緩存
fu.setSizeThreshold(1024 * 1024);
//採用默認的臨時文件存儲位置
//fu.setRepositoryPath(...);
//設置上傳的普通欄位的名稱和文件欄位的文件名所採用的字元集編碼
fu.setHeaderEncoding("gb2312");
//得到所有表單欄位對象的集合
List fileItems = null;
try
{
fileItems = fu.parseRequest(request);//解析request對象中上傳的文件
}
catch (FileUploadException e)
{
out.println("解析數據時出現如下問題：");
e.printStackTrace(out);
return;
}
//處理每個表單欄位
Iterator i = fileItems.iterator();
while (i.hasNext())
{
FileItem fi = (FileItem) i.next();
if (fi.isFormField()){
String content = fi.getString("GB2312");
String fieldName = fi.getFieldName();
request.setAttribute(fieldName,content);
}else{
try
{
String pathSrc = fi.getName();
if(pathSrc.trim().equals("")){
continue;
}
int start = pathSrc.lastIndexOf('\\');
String fileName = pathSrc.substring(start + 1);
File pathDest = new File(uploadDir, fileName);
fi.write(pathDest);
String fieldName = fi.getFieldName();
request.setAttribute(fieldName, fileName);
}catch (Exception e){
out.println("存儲文件時出現如下問題：");
e.printStackTrace(out);
return;
}
finally //總是立即刪除保存表單欄位內容的臨時文件
{
fi.delete();
}
}
}
注意 JSP頁面的form要加enctype="multipart/form-data" 屬性， 提交的時候要向伺服器說明一下 此頁麵包含文件。
如果 還是麻煩，乾脆使用Struts 的上傳組件 他對FileUpload又做了封裝，使用起來更傻瓜化，很容易掌握。
-----------------------------
以上回答，如有不明白可以聯系我。
❺ java web開發，上傳圖片並讀取
java web開發中，使用文件操作類來上傳圖片並讀取，如下代碼：
*@desc:圖片處理工具
*@author:bingye
*@createTime:2015-3-17下午04:25:32
*@version:v1.0
*/
publicclassImageUtil{
/**
*將圖片寫到客戶端
*@author:bingye
*@createTime:2015-3-17下午04:36:04
*@history:
*@paramimage
*@paramresponsevoid
*/
publicstaticvoidwriteImage(byte[]image,HttpServletResponseresponse){
if(image==null){
return;
}
byte[]buffer=newbyte[1024];
InputStreamis=null;
OutputStreamos=null;
try{
is=newByteArrayInputStream(image);
os=response.getOutputStream();
while(is.read(buffer)!=-1){
os.write(buffer);
os.flush();
}
}catch(IOExceptione){
e.printStackTrace();
}finally{
try{
if(is!=null){is.close();}
if(os!=null){os.close();}
}catch(IOExceptione){
e.printStackTrace();
}
}
}
/**
*獲取指定路勁圖片
*@author:bingye
*@createTime:2015-3-21上午10:50:44
*@paramfilePath
*@paramresponsevoid
*/
publicstaticvoidwriteImage(StringfilePath,HttpServletResponseresponse){
FileimageFile=newFile(filePath);
if(imageFile!=null&&imageFile.exists()){
byte[]buffer=newbyte[1024];
InputStreamis=null;
OutputStreamos=null;
try{
is=newFileInputStream(imageFile);
os=response.getOutputStream();
while(is.read(buffer)!=-1){
os.write(buffer);
os.flush();
}
}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}finally{
try{
if(is!=null){is.close();}
if(os!=null){os.close();}
}catch(IOExceptione){
e.printStackTrace();
}
}
}
}
/**
*圖片上傳到文件夾
*@author:bingye
*@createTime:2015-3-20下午08:07:25
*@paramfile
*@paramsavePath
*@returnboolean
*/
(CommonsMultipartFilefile,StringsavePath){
if(file!=null&&!file.isEmpty()){
//獲取文件名稱
StringfileName=file.getOriginalFilename();
//獲取後綴名
StringsuffixName=fileName.substring(fileName.indexOf(".")+1);
//新名稱
StringnewFileName=System.currentTimeMillis()+"."+suffixName;
//新文件路勁
StringfilePath=savePath+newFileName;
//獲取存儲文件路徑
FilefileDir=newFile(savePath);
if(!fileDir.exists()){
//如果文件夾沒有：新建
fileDir.mkdirs();
}
FileOutputStreamfos=null;
try{
fos=newFileOutputStream(filePath);
fos.write(file.getBytes());
fos.flush();
returnResultUtil.success("UPLOAD_SUCCESS",URLEncoder.encode(newFileName,"utf-8"));
}catch(Exceptione){
e.printStackTrace();
returnResultUtil.fail("UPLOAD_ERROR");
}finally{
try{
if(fos!=null){
fos.close();
}
}catch(IOExceptione){
e.printStackTrace();
returnResultUtil.fail("UPLOAD_ERROR");
}
}
}
returnResultUtil.fail("UPLOAD_ERROR");
}}
❻ java怎樣上傳圖片(寫個例子謝謝);
用struts2框架。。。馬上OK。。。
在響應的ACTION中，只需要定義一個File的變數即可
❼ java實現圖片上傳至伺服器並顯示，如何做
給你段代碼，是用來在ie上顯示圖片的（servlet）：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String id = request.getParameter("id");
File file = new File(getServletContext().getRealPath("/")+"out"+"/"+id+".gif");
response.setCharacterEncoding("gb2312");
response.setContentType("doc");
response.setHeader("Content-Disposition", "attachment; filename=" + new String(file.getName().getBytes("gb2312"),"iso8859-1"));
System.out.println(new String(file.getName().getBytes("gb2312"),"gb2312"));
OutputStream output = null;
FileInputStream fis = null;
try
{
output = response.getOutputStream();
fis = new FileInputStream(file);
byte[] b = new byte[1024];
int i = 0;
while((i = fis.read(b))!=-1)
{
output.write(b, 0, i);
}
output.write(b, 0, b.length);
output.flush();
response.flushBuffer();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace();
}
finally
{
if(fis != null)
{
fis.close();
fis = null;
}
if(output != null)
{
output.close();
output = null;
}
}
}
這個程序的功能是根據傳入的文件名（id），來為瀏覽器返回圖片流，顯示在<img>標簽里
標簽的格式寫成如下：
<img src="http://localhost:8080/app/preview?id=111 "/><br/>
顯示的是111.gif這個圖片
你上面的問題：
1.我覺得你的第二個辦法是對的，我們也是這樣做的，需要的是把資料庫的記錄id號傳進servlet,然後讀取這條記錄中的路徑信息，生成流以後返回就是了
關於上傳文件的問題，我記得java中應該專門有個負責文件上傳的類，你調用就行了，上傳後存儲在指定的目錄里，以實體文件的形式存放
你可以參考這個：
http://blog.csdn.net/arielxp/archive/2004/09/28/119592.aspx
回復：
1.是的，在response中寫入流就行了
2.是發到servlet中的，我們一般都是寫成servlet,短小精悍，使用起來方便，struts應該也可以，只是我沒有試過，恩，你理解的很對
❽ java怎麼上傳圖片
使用Commons-FileUpload 上傳文件
Struts 的文件上傳
jspSmartUpload上傳文件
❾ java實現上傳圖片功能
首先需要先要在資料庫中建立一個數據表格一遍存儲和查詢，在數據表格中的項中添加數據區和存儲路徑。數據區用來存儲圖片，在存儲時需要用到轉換功能，讓圖片轉換成數據流字元然後才能導入資料庫進行存儲，並且在輸入同時在同一語句中添加存儲路徑。
希望以上思路能讓你有點啟發
❿ java圖片上傳
public class UploadBean {
private String saveDir = "."; // 要保存文件的路徑
private String charset = ""; // 字元集
private ArrayList<Object> tmpFileName = new ArrayList<Object>(); // 臨時存放文件名的數據結構
private Hashtable<String,String> parameter = new Hashtable<String,String>(); // 存放參數名和值的數據結構
private HttpServletRequest request; // 用於傳入請求對象的實例
private String boundary = ""; // 內存數據的分隔符
private int len = 0; // 每次從內在中實際讀到的位元組長度
private String queryString;
private int count; // 上載的文件總數
private String[] fileName; // 上載的文件名數組
private long maxFileSize = 1024*1024 * 1024 * 1; // 最大文件上載位元組;
private String tagFileName = ""; public final void init(HttpServletRequest request) throws ServletException {
this.request = request;
boundary = request.getContentType().substring(30); // 得到內存中數據分界符
queryString = request.getQueryString();
} public String getParameter(String s) { // 用於得到指定欄位的參數值,重寫request.getParameter(String
// s)
if (parameter.isEmpty()) {
return null;
}
return (String) parameter.get(s);
} public String[] getParameterValues(String s) { // 用於得到指定同名欄位的參數數組,重寫request.getParameterValues(String
// s)
ArrayList<String> al = new ArrayList<String>();
if (parameter.isEmpty()) {
return null;
}
Enumeration<String> e = parameter.keys();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
if (-1 != key.indexOf(s + "||||||||||") || key.equals(s)) {
al.add(parameter.get(key));
}
}
if (al.size() == 0) {
return null;
}
String[] value = new String[al.size()];
for (int i = 0; i < value.length; i++) {
value[i] = (String) al.get(i);
}
return value;
} public String getQueryString() {
return queryString;
} public int getCount() {
return count;
} public String[] getFileName() {
return fileName;
} public void setMaxFileSize(long size) {
maxFileSize = size;
} public void setTagFileName(String filename) {
tagFileName = filename;
} public void setSaveDir(String saveDir) { // 設置上載文件要保存的路徑
this.saveDir = saveDir;
File testdir = new File(saveDir); // 為了保證目錄存在,如果沒有則新建該目錄
if (!testdir.exists()) {
testdir.mkdirs();
}
} public void setCharset(String charset) { // 設置字元集
this.charset = charset;
} public boolean uploadFile() throws ServletException, IOException { // 用戶調用的上載方法
setCharset(request.getCharacterEncoding());
return uploadFile(request.getInputStream());
} private boolean uploadFile(ServletInputStream servletinputstream) throws // 取得央存數據的主方法
ServletException, IOException {
String line = null;
byte[] buffer = new byte[4096];
while ((line = readLine(buffer, servletinputstream, charset)) != null) {
if (line.startsWith("Content-Disposition: form-data;")) {
int i = line.indexOf("filename=");
if (i >= 0) { // 如果一段分界符內的描述中有filename=,說明是文件的編碼內容
String fName = getFileName(line);
if (fName.equals("")) {
continue;
}
if (count == 0 && tagFileName.length() != 0) {
String ext = fName.substring((fName.lastIndexOf(".") + 1));
fName = tagFileName + "." + ext;
}
tmpFileName.add(fName);
count++;
while ((line = readLine(buffer, servletinputstream, charset)) != null) {
if (line.length() <= 2) {
break;
}
}
File f = new File(saveDir, fName);
FileOutputStream dos = new FileOutputStream(f);
long size = 0l;
while ((line = readLine(buffer, servletinputstream, null)) != null) {
if (line.indexOf(boundary) != -1) {
break;
}
size += len;
if (size > maxFileSize) {
throw new IOException("文件超過" + maxFileSize + "位元組!");
}
dos.write(buffer, 0, len);
}
dos.close();
} else { // 否則是欄位編碼的內容
String key = getKey(line);
String value = "";
while ((line = readLine(buffer, servletinputstream, charset)) != null) {
if (line.length() <= 2) {
break;
}
}
while ((line = readLine(buffer, servletinputstream, charset)) != null) { if (line.indexOf(boundary) != -1) {
break;
}
value += line;
}
put(key, value.trim(), parameter);
}
}
}
if (queryString != null) {
String[] each = split(queryString, "&");
for (int k = 0; k < each.length; k++) {
String[] nv = split(each[k], "=");
if (nv.length == 2) {
put(nv[0], nv[1], parameter);
}
}
}
fileName = new String[tmpFileName.size()];
for (int k = 0; k < fileName.length; k++) {
fileName[k] = (String) tmpFileName.get(k); // 把ArrayList中臨時文件名倒入數據中供用戶調用
}
if (fileName.length == 0) {
return false; // 如果fileName數據為空說明沒有上載任何文件
}
return true;
} private void put(String key, String value, Hashtable<String,String> ht) {
if (!ht.containsKey(key)) {
ht.put(key, value);
} else { // 如果已經有了同名的KEY,就要把當前的key更名,同時要注意不能構成和KEY同名
try {
Thread.sleep(1); // 為了不在同一ms中產生兩個相同的key
} catch (Exception e) {
}
key += "||||||||||" + System.currentTimeMillis();
ht.put(key, value);
}
} /*
* 調用ServletInputstream.readLine(byte[] b,int
* offset,length)方法,該方法是從ServletInputstream流中讀一行
* 到指定的byte數組,為了保證能夠容納一行,該byte[]b不應該小於4096,重寫的readLine中,調用了一個成員變數len為
* 實際讀到的位元組數(有的行不滿4096),則在文件內容寫入時應該從byte數組中寫入這個len長度的位元組而不是整個byte[]
* 的長度,但重寫的這個方法返回的是String以便分析實際內容,不能返回len,所以把len設為成員變數,在每次讀操作時 把實際長度賦給它.
* 也就是說在處理到文件的內容時數據既要以String形式返回以便分析開始和結束標記,又要同時以byte[]的形式寫到文件 輸出流中.
*/
private String readLine(byte[] Linebyte,
ServletInputStream servletinputstream, String charset) {
try {
len = servletinputstream.readLine(Linebyte, 0, Linebyte.length);
if (len == -1) {
return null;
}
if (charset == null) {
return new String(Linebyte, 0, len);
} else {
return new String(Linebyte, 0, len, charset);
} } catch (Exception _ex) {
return null;
} } private String getFileName(String line) { // 從描述字元串中分離出文件名
if (line == null) {
return "";
}
int i = line.indexOf("filename=");
line = line.substring(i + 9).trim();
i = line.lastIndexOf("");
if (i < 0 || i >= line.length() - 1) {
i = line.lastIndexOf("\\");
if (line.equals("")) {
return "";
}
if (i < 0 || i >= line.length() - 1) {
return line;
}
}
return line.substring(i + 1, line.length() - 1);
} private String getKey(String line) { // 從描述字元串中分離出欄位名
if (line == null) {
return "";
}
int i = line.indexOf("name=");
line = line.substring(i + 5).trim();
return line.substring(1, line.length() - 1);
} public static String[] split(String strOb, String mark) {
if (strOb == null) {
return null;
}
StringTokenizer st = new StringTokenizer(strOb, mark);
ArrayList<String> tmp = new ArrayList<String>();
while (st.hasMoreTokens()) {
tmp.add(st.nextToken());
}
String[] strArr = new String[tmp.size()];
for (int i = 0; i < tmp.size(); i++) {
strArr[i] = (String) tmp.get(i);
}
return strArr;
}
}