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;

@Controller
public 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")
	@ResponseBody
	public 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jsonpCallback
				jsonpCallback:"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;
    }
}

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!