ajax跨域调用

package com.vv.controller;import java.io.IOException;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import redis.clients.jedis.Jedis;import com.vv.common.GenRandomCode;import com.vv.common.RedisMgr;@Controllerpublic class getImageCtl {private static final Logger _log = LoggerFactory.getLogger("accpet");private static int TIMEOUTSCENDS =3*60;private static String UserFiex= "IMG_VERFIY";@RequestMapping("/getimage.htm")public void getimage(HttpServletRequest request,HttpServletResponse response)throws Exception {String code = this.showVerifyCode(request,response);String uuid = utfStr(request.getParameter("uuid"));_log.info("getimage get parameter uuid = " + uuid );Jedis jedis = null;try{jedis =RedisMgr.getResource();String key = UserFiex+"_"+uuid;_log.info("getimage key = " + key );jedis.setex(UserFiex+"_"+uuid, TIMEOUTSCENDS,code);} catch (Throwable ce) {RedisMgr.returnBrokenJedis(jedis);} finally {RedisMgr.returnResource(jedis);}}@RequestMapping("/verify.htm")@ResponseBodypublic String verify(HttpServletRequest request,HttpServletResponse response)throws Exception {String uuid = utfStr(request.getParameter("uuid"));String code = utfStr(request.getParameter("code"));String back= "-1";Jedis jedis = null;try{jedis =RedisMgr.getResource();String codeBak =  null;String key = UserFiex+"_"+uuid;_log.info("verify key = " + key );codeBak = jedis.get(key);  if(key==null||code==null){ back =  "-3";//参数错误}else if(codeBak==null){back =  "-2";//无效验证码  :uuid没有对应验证码，验证码失效，验证已被验证正确过}else if(key!=null && code != null && codeBak != null && code.equalsIgnoreCase(codeBak)){jedis.del(key);back =  "1";//正确}else {back = "-1";//验证错误}} catch (Throwable ce) {RedisMgr.returnBrokenJedis(jedis);} finally {RedisMgr.returnResource(jedis);}return back;}/** *  * jsonp访问接口验证图片地址：/verify2.htm参数:uuid：校验key   //uuid      code：待校验字符串 jsonp:jsonpCallback //必填参数返回：1:正确 -1:错误-2:无效验证码  :uuid对应验证码失效，uuid对应验证已被验证正确过,uuid没有对应验证码-3:参数错误超时时间为3分钟e.g.$.ajax({type:"get",url:"http://verify.im.baidu.com/verify2.htm",data:{"uuid":uuid,"code":v},dataType:"jsonp",jsonp: "jsonpCallback",//必填 且必须是jsonpCallbackjsonpCallback:"trest",//自定义任意async:false,success:function(data){alert(data); // -1 -2 -3  1},error:function(data){alert("error");}}); *  *  * @param request * @param response * @throws IOException */@RequestMapping("/verify2.htm")public void showVerifyCodeForJsonp( HttpServletRequest request,HttpServletResponse response)throws IOException{response.setContentType("text/plain");      response.setHeader("Pragma", "No-cache");      response.setHeader("Cache-Control", "no-cache");      response.setDateHeader("Expires", 0);      String jsonpCallback = request.getParameter("jsonpCallback");//客户端请求参数  String uuid = utfStr(request.getParameter("uuid"));String code = utfStr(request.getParameter("code"));String back= "-1";Jedis jedis = null;try{jedis =RedisMgr.getResource();String codeBak =  null;String key = UserFiex+"_"+uuid;_log.info("verify key = " + key );codeBak = jedis.get(key);  if(key==null||code==null){ back =  "-3";//参数错误}else if(codeBak==null){back =  "-2";//无效验证码  :uuid没有对应验证码，验证码失效，验证已被验证正确过}else if(key!=null && code != null && codeBak != null && code.equalsIgnoreCase(codeBak)){jedis.del(key);back =  "1";//正确}else {back = "-1";//验证错误}} catch (Throwable ce) {RedisMgr.returnBrokenJedis(jedis);} finally {RedisMgr.returnResource(jedis);}        PrintWriter out = response.getWriter();       back = jsonpCallback+"("+back+")";out.write(back);}private String showVerifyCode( HttpServletRequest request,HttpServletResponse response) throws IOException{GenRandomCode verifyCode = new GenRandomCode();verifyCode.createCode();String code = verifyCode.getCode();_log.info(" verify code = " + code );response.setContentType("image/png");verifyCode.write(response.getOutputStream());return code;}public String utfStr(String str)    {if(str!=null){ try        {            URLEncoder.encode(str, "utf-8");            return str;        }        catch (UnsupportedEncodingException e)        {            e.printStackTrace();        }}        return null;    }}