**以下代码可供参考，不建议直接拷贝到项目中使用** ``` // 本示例使用了Servlet3.0对文件上传的支持 import java.io.IOException; import java.util.Arrays; import java.util.UUID; 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; @WebServlet("/upload") @MultipartConfig public class UploadImgServlet extends HttpServlet { private static final long serialVersionUID = -2712624630388027149L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Do nothing... } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("textml;charset=UTF-8"); request.setCharacterEncoding("UTF-8"); Part part = request.getPart("myFileName");// myFileName是文件域的name属性值 // 文件类型限制 String[] allowedType = { "image/bmp", "image/gif", "image/jpeg", "image/png" }; boolean allowed = Arrays.asList(allowedType).contains(part.getContentType()); if (!allowed) { response.getWriter().write("error|不支持的类型"); return; } // 图片大小限制 if (part.getSize() > 5 * 1024 * 1024) { response.getWriter().write("error|图片大小不能超过5M"); return; } // 包含原始文件名的字符串 String fi = part.getHeader("content-disposition"); // 提取文件拓展名 String fileNameExtension = fi.substring(fi.indexOf("."), fi.length() - 1); // 生成实际存储的真实文件名 String realName = UUID.randomUUID().toString() + fileNameExtension; // 图片存放的真实路径 String realPath = getServletContext().getRealPath("/files") + "/" + realName; // 将文件写入指定路径下 part.write(realPath); // 返回图片的URL地址 response.getWriter().write(request.getContextPath() + "/files/" + realName); } } ```