建站
咨詢
售后
建站咨詢
新聞中心
這里有您想知道的互聯(lián)網(wǎng)營銷解決方案
Jquery上傳插件Uploadify無刷新上傳文件
Uploadify v3.2.1 上傳圖片并預(yù)覽
屯留ssl適用于網(wǎng)站、小程序/APP、API接口等需要進(jìn)行數(shù)據(jù)傳輸應(yīng)用場景，ssl證書未來市場廣闊！成為成都創(chuàng)新互聯(lián)公司的ssl證書銷售渠道，可以享受市場價(jià)格4-6折優(yōu)惠！如果有意向歡迎電話聯(lián)系或者加微信：13518219792（備注：SSL證書合作）期待與您的合作！
前端JSP：
后端servlet：
package com.mybank.enterprise.framework.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Iterator;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.mybank.enterprise.util.Constant;
import com.mybank.enterprise.util.StringUtil;
public class UploadIMGSerlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// 上傳文件的保存路徑
private String configPath = Constant.RB.getString("img_path");
// 臨時(shí)文件路徑
private String dirTemp = "resource/temp/";
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String ret_fileName = null;//返回給前端已修改的圖片名稱
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
// 文件保存目錄路徑
String savePath = configPath;
// 臨時(shí)文件目錄
String tempPath = this.getServletContext().getRealPath("/") + dirTemp;
// 創(chuàng)建文件夾
File dirFile = new File(savePath);
if (!dirFile.exists()) {
dirFile.mkdirs();
}
// 創(chuàng)建臨時(shí)文件夾
File dirTempFile = new File(tempPath);
if (!dirTempFile.exists()) {
dirTempFile.mkdirs();
}
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(20 * 1024 * 1024); // 設(shè)定使用內(nèi)存超過5M時(shí)，將產(chǎn)生臨時(shí)文件并存儲(chǔ)于臨時(shí)目錄中。
factory.setRepository(new File(tempPath)); // 設(shè)定存儲(chǔ)臨時(shí)文件的目錄。
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
try {
List items = upload.parseRequest(request);
Iterator itr = items.iterator();
while (itr.hasNext()) {
FileItem item = (FileItem) itr.next();
String fileName = item.getName();
if(fileName!=null){
String endstr = fileName.substring(fileName.indexOf("."),fileName.length());
fileName = StringUtil.createSerial20().concat(endstr);
ret_fileName = fileName;
}
if (!item.isFormField()) {
try {
File uploadedFile = new File(savePath,fileName);
OutputStream os = new FileOutputStream(uploadedFile);
InputStream is = item.getInputStream();
byte buf[] = new byte[1024];// 可以修改 1024 以提高讀取速度
int length = 0;
while ((length = is.read(buf)) > 0) {
os.write(buf, 0, length);
}
// 關(guān)閉流
os.flush();
os.close();
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
//將已修改的圖片名稱返回前端
out.print(ret_fileName);
out.flush();
out.close();
}
}顯示圖片servlet
package com.mybank.enterprise.framework.servlet;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mybank.enterprise.util.Constant;
public class GetIMGServlet extends HttpServlet {
private static final long serialVersionUID = 2761789171087122738L;
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file = req.getParameter("file");
File pic = new File(Constant.RB.getString("img_path")+file);
FileInputStream fis = new FileInputStream(pic);
OutputStream os = resp.getOutputStream();
try {
int count = 0;
byte[] buffer = new byte[1024 * 1024];
while ((count = fis.read(buffer)) != -1)
os.write(buffer, 0, count);
os.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null)
os.close();
if (fis != null)
fis.close();
}
}
}img標(biāo)簽的src可以指向servlet只要返回流對(duì)象即可，常用的如驗(yàn)證碼
參考文章：
http://www.cnblogs.com/yangy608/p/3915337.html
網(wǎng)頁題目：Jquery上傳插件Uploadify無刷新上傳文件
網(wǎng)站網(wǎng)址：http://www.dlmjj.cn/article/pjeche.html
