编辑jsp页面：
1 <html> 2 <head> 3 <base href="<%=basePath%>"> 4 5 <title>My JSP 'index.jsp' starting page</title> 6 <meta http-equiv="pragma" content="no-cache"> 7 <meta http-equiv="cache-control" content="no-cache"> 8 <meta http-equiv="expires" content="0"> 9 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 10 <meta http-equiv="description" content="This is my page"> 11 <!-- 12 <link rel="stylesheet" type="text/css" href="styles.css"> 13 --> 14 </head> 15 16 <body> 17 <div class="container"> 18 <!-- 文件上传时必须设置 entype 为 multipart/form-data 不对字符进行编码 --> 19 <form action="UploadServlet" method="post" enctype="multipart/form-data"> 20 <table> 21 <tr> 22 <!-- 设置 for ="file" 在鼠标点击标签时会弹出文件选取框 --> 23 <td><label for="file">上传文件：</label></td> 24 <td><input type="file" id="file" name="picture" value=""/></td> 25 </tr> 26 <tr> 27 <!-- 设置占据两个单元格 --> 28 <td colspan="2" ><input type="submit" value="提交"/></td> 29 </tr> 30 </table> 31 </form> 32 </div> 33 34 </body> 35 </html>
编辑servlet：
1 import java.io.IOException; 2 import java.util.UUID; 3 4 import javax.servlet.ServletException; 5 import javax.servlet.annotation.MultipartConfig; 6 import javax.servlet.annotation.WebServlet; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 import javax.servlet.http.Part; 11 12 @WebServlet("/UploadServlet") 13 @MultipartConfig 14 public class UploadServlet extends HttpServlet{ 15 16 @Override 17 protected void doGet(HttpServletRequest req, HttpServletResponse resp) 18 throws ServletException, IOException { 19 super.doPost(req, resp); 20 } 21 @Override 22 protected void doPost(HttpServletRequest req, HttpServletResponse resp) 23 throws ServletException, IOException { 24 //获取文件部件 part 25 Part part = req.getPart("upload"); 26 //获取服务器的路径 27 String root = req.getServletContext().getRealPath("/upload"); 28 System.out.println("服务器路径:"+root); 29 /** 30 * 可以选择 使用getSubmittedFikeName 获取文件名 或从文件头部信息中截取文件名 31 */ 32 /** 33 * 获取文件名 34 */ 35 String name= part.getSubmittedFileName(); 36 System.out.println("SubmittedFileName:" + name); 37 //截取文件后缀名 38 String ext = name.substring(name.lastIndexOf("."),name.length()); 39 /** 40 * 获取文件头部信息（目的是从头部信息中截取文件名或扩展名） 41 */ 42 // String name=part.getHeader("content-disposition"); 43 // System.out.println("name:"+name); 44 // //获取文件后缀名 45 // //form-data; name="upload"; filename="C:UsersAdministratorDesktoperror.PNG" 46 // //需要提取从最后一个点后的后缀名 由于默认路径字符串里最后带有引号 则需要使用length()-1 47 // String ext = name.substring(name.lastIndexOf("."),name.length()-1); 48 // System.out.println("ext:"+ext); 49 //写出完整的文件路径 50 String filename = root+"\"+UUID.randomUUID().toString()+ext; 51 System.out.println("filename:"+filename); 52 //写入文件 53 part.write(filename); 54 55 } 56 57 58 }