java jquery 单个和多个图片上传的例子

package com.servlet; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.Collection; import javax.servlet.ServletException; import javax.servlet.annotation.MultipartConfig; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.Part; /** * 多个文件上传服务. * * @author : Yc */ @WebServlet(urlPatterns = { "/uploadMultiService" }) @MultipartConfig public class UploadMultiServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String charset = "UTF-8"; req.setCharacterEncoding(charset); resp.setCharacterEncoding(charset); //getParts方法获取表单的所有成员. Collection<Part> parts = req.getParts(); for (Part part : parts) { // 需要判断当前的part封装的是普通的表单项(文本框,单选按钮......),还是上传域 if (part.getContentType() == null) { // part的ContentType保存了上传的数据信息,如果为空,代表当前的part封装了普通表单项 System.out.println(">>> 当前的part是普通的表单项目,不是上传域"); } else { // 如果是上传域,保存上传的数据到指定位置 saveFile(part,req); } } resp.getWriter().write("upload ok");// 回写文本响应,激活ajax的success事件 resp.getWriter().close(); } private void saveFile(Part part,HttpServletRequest req) throws ServletException, IOException { String header = part.getHeader("Content-Disposition"); String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\"")); String uploadDir = req.getServletContext().getRealPath("/")+"uploads/"; InputStream in = part.getInputStream(); FileOutputStream os = new FileOutputStream(uploadDir+fileName); byte[] bytes = new byte[1024]; int len = -1; // IO读写 while((len=in.read(bytes))!=-1){ os.write(bytes, 0, len); } System.out.println(">>> 保存上传文件完成! "); in.close(); os.close(); } }