SpringMVC框架下使用jQueryAJAX进行数据交互

package com.mlxp.controller; import java.awt.Color; import java.awt.Graphics; import java.awt.Image; import java.awt.image.FilteredImageSource; import java.io.IOException; import java.io.PrintWriter; import java.util.Random; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import Acme.JPM.Encoders.GifEncoder; import com.eteks.awt.PJAGraphicsExtension; import com.eteks.awt.PJAGraphicsManager; import com.eteks.awt.PJAImage; import com.eteks.filter.Web216ColorsFilter; @Controller @RequestMapping("/login") public class LoginController { @RequestMapping("/checkLogin") public void checkLogin(String logintype,String username, String password, String code ,HttpServletRequest request, HttpServletResponse response, ModelMap model) { System.out.println("checkLogin"); int status = 0; String result = "？？？"; if(username==null || password == null ){ status = 2; result = "请输入用户名和密码！"; }else{ //验证码 String maskCode = (String)request.getSession().getAttribute("maskCode"); if(maskCode==null || "".equals(maskCode) || code==null ){ status = 4; result = "验证超时"; }else{ maskCode = maskCode.toLowerCase(); code = code.toLowerCase(); if(!maskCode.equals(code)){ status = 5; result = "验证码输入错误"; }else{ if("mlxp".equals(username)&&"123456".equals(password)){ status = 6; result = "登陆成功"; request.getSession().setAttribute("username", "mlxp"); }else{ status = 7; result = "用户名或密码错误"; } } } } //xml StringBuffer xml = new StringBuffer(); xml.append("<root>"); xml.append("<result>"+result+"</result>"); xml.append("<status>"+status+"</status>"); xml.append("</root>"); responseXMLString(response, xml.toString()); } @RequestMapping("/logout") public String logout(HttpServletRequest request){ request.getSession().removeAttribute("username"); return "login"; } /** * 生成验证码 * @throws IOException */ @RequestMapping("/maskCode") public void maskCode(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 产生4位随机数字 Random random = new Random(); String sRand = ""; for (int i = 0; i < 4; i++) { String rand = String.valueOf(random.nextInt(10)); sRand += rand; } // 设定字体 String fontPath = request.getSession().getServletContext().getRealPath("/fonts"); PJAGraphicsManager graphicsManager; graphicsManager = PJAGraphicsManager.getDefaultGraphicsManager(); graphicsManager.loadFonts(fontPath); // 画图 Image localImage = new PJAImage(46, 20); Object localObject = localImage.getGraphics(); ((PJAGraphicsExtension) localObject).setFont("", 1, 14); ((Graphics) localObject).setColor(Color.gray); ((Graphics) localObject).draw3DRect(0, 0, 45, 19, false); ((Graphics) localObject).setColor(Color.black); ((Graphics) localObject).drawString(sRand, 5, 16); Random localRandom = new Random(System.currentTimeMillis()); for (int i = 0; i < 80; ++i) { int j = localRandom.nextInt(46); int k = localRandom.nextInt(20); ((Graphics) localObject).drawLine(j, k, j, k); } sendGIFImage(localImage, response); //将验证码存入session request.getSession().setAttribute("maskCode", sRand); } /** * 将图片输出到浏览器 */ public void sendGIFImage(Image paramImage, HttpServletResponse response) throws ServletException, IOException { // 禁止图像缓存。 response.setContentType("image/gif"); response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setHeader("Expires", "0"); ServletOutputStream localServletOutputStream = response.getOutputStream(); try { new GifEncoder(paramImage, localServletOutputStream).encode(); } catch (IOException localIOException) { new GifEncoder(new FilteredImageSource(paramImage.getSource(),new Web216ColorsFilter()), localServletOutputStream).encode(); } localServletOutputStream.flush(); } public void responseXMLString(HttpServletResponse response, String xml){ response.setContentType("application/xml"); response.setCharacterEncoding("UTF-8"); PrintWriter out = null; try { out = response.getWriter(); out.print(xml.toString()); } catch (IOException e) { e.printStackTrace(); } finally { if (out != null){ out.close(); } } } }