项目开发过程中碰到问题汇总

 

一 网站跨域问题

      网站跨域是指请求的目标网站与当前所在的发请求的网站，不在一个域名映射下面，这样的请求就会被浏览器拒绝，认为是跨域调用

   解决办法 

1 jsonp进行异步跨域请求

2 被调方设置请求头允许跨域

response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

3 httpclient进行内部转发

4 通过nginx api网站进行反向代理转发

5 通过spring-cloude zuul网关转发
       

二 城市级联查询参数回显的问题

	var province=$("#province").val();
    	if(province!=0){
    		$("select[name='province']").val(province);
    		$("select[name='province']").trigger("change");
    		var city=$("#city").val();
    		$("select[name='city']").val(city);
    	}

三 导出文件查询参数传递的问题

//导出数据
    	$("#export").bind("click",function(){
    			var param=$("#searchForm").serialize();
    			window.location.href="${ctx}/dealer/enroll/export.do? 
                 dealerId=${dealerId}&"+param;
    	});

四 异步加载页面的问题

    后台返回jsp页面，js异步加载回来一个页面 往指定区域丢就可以了使用html标签做全局替换

 $.ajax({
            type: "GET",
            url: tml,
            data:{
            	param:param,
            	pageNo:pageNo,
            	pageSize:pageSize
            } ,
            dataType: 'html',
            success: function(res){
           		 $("#wrapper").html(res);
            },
            errot:function(error){
                poptys("网络异常，请稍后再试！");
            }
        });

五 百万数据导出poi报错问题

(1)集成java包

        
			org.apache.poi
			poi
			${poi.version}
		
		
			org.apache.poi
			poi-ooxml
			${poi.version}
		
		
			org.apache.poi
			poi-ooxml-schemas
			${poi.version}
		

(2)编写工具类

public class ExcelUtils {
    /**
     * 导出Excel
     * @param sheetName sheet名称
     * @param title 标题
     * @param values 内容
     * @param wb HSSFWorkbook对象
     * @return
     */
    public static SXSSFWorkbook getXSSFWorkbook(int total,String []title,String [][]values, XSSFWorkbook wbs){
        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        if(wbs == null){
            wbs = new XSSFWorkbook();
        }
        SXSSFWorkbook wb= new SXSSFWorkbook(wbs, 100);
        double rel=Double.valueOf(total)/1000000;
        int step=(int) Math.ceil(rel);
        for(int st=0;st

 

(3) 实现导出控制

 @RequestMapping(value="/export.do")
	 public String export(HttpServletRequest request, HttpServletResponse response) throws Exception {
		 Env env=EnvUtils.getEnv();
		 Map queryparam = new HashMap();
		 paramQuery(env, queryparam);
		 long dealerId = env.paramLong("dealerId");
	     int total = dealerEnrollService.findTotalByDearId(dealerId, queryparam);
		 List dealerEnrolls = dealerEnrollService.findByDearId(0,0,dealerId,queryparam);
		 SXSSFWorkbook wb=null;
		 OutputStream os=null;
		 long start = System.currentTimeMillis();
		try {	
			    String[] title = {"序号","投放序号","姓名","手机","城市","车系","报名时间","效果"};
			    String fileName = "线索信息表"+System.currentTimeMillis()+".xlsx";
			    
			    String[][] content = new String[total][title.length];
			    for (int i = 0; i < total; i++) {
			          content[i][0] = dealerEnrolls.get(i).getId()+"";
			          content[i][1] = dealerEnrolls.get(i).getLuanchId()+"";
			          content[i][2] = dealerEnrolls.get(i).getName();
			          content[i][3] = dealerEnrolls.get(i).getPhone();
			          content[i][4] = dealerEnrolls.get(i).getCity();
			          content[i][5] = dealerEnrolls.get(i).getSerialName();
			          content[i][6] = T.format(dealerEnrolls.get(i).getCreateat(), "yyyy-MM-dd");
			          content[i][7] = dealerEnrolls.get(i).getExportDesc();
			     }
			    wb = ExcelUtils.getXSSFWorkbook(total,title, content, null);
		        response.setContentType("application/octet-stream;charset=utf-8");
		        response.setHeader("Content-Disposition", "attachment;filename="+java.net.URLEncoder.encode(fileName, "UTF-8"));
		        response.addHeader("Pargam", "no-cache");
		        response.addHeader("Cache-Control", "no-cache");
		        os= response.getOutputStream();
		 		wb.write(os);
	 		long end = System.currentTimeMillis();
	 		logger.info("export data expend time:="+(end-start));
	     } catch (Exception ex) {
	    	 throw new RuntimeException(ex.getMessage());
	     }finally{
	 		try {
				os.flush();
				os.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				 throw new RuntimeException(e.getMessage());
			}
	     }
		return "dealer/admin/enroll/list";
	 }

六 导出文件中文名丢失问题

加上这一句

  response.setHeader("Content-Disposition", "attachment;filename="+java.net.URLEncoder.encode(fileName, "UTF-8"));

 

七 关于浏览行请求兼容性问题

 

八 接口联条乱码问题

     这个问题是我在跟其他团队进行接口联调过程中碰到的，因为不知道到底是发送方问题导致，还是接收方问题导致的乱码

问题，以至于互相甩锅了很久。最后自己想到了一个办法，检查对方传过来的编码，然后自己再对应的转化一下

 

/** 
	* @Title: getCode 
	* @Description: TODO(这里用一句话描述这个方法的作用) 
	* @param str
	* @return   
	* @author xiaozhengwen 
	* JSONObject    返回类型 
	* @throws 
	*/
	private String getCode(String str) {
		try {
		  String encode = "GB2312";    
	      if (str.equals(new String(str.getBytes(encode), encode))) {      //判断是不是GB2312
	           String s = encode;      
	          return s;      //是的话，返回“GB2312“，以下代码同理
	      }       
		  encode = "ISO-8859-1";      
	      if (str.equals(new String(str.getBytes(encode), encode))) {      //判断是不是ISO-8859-1
	           String s1 = encode;      
	          return s1;      
	      }       
		  encode = "UTF-8";        
		  if (str.equals(new String(str.getBytes(encode), encode))) {   //判断是不是UTF-8
		           String s2 = encode;      
		          return s2;      
		  }     
		  encode = "GBK";     
	      if (str.equals(new String(str.getBytes(encode), encode))) {      //判断是不是GBK
	           String s3 = encode;      
	          return s3;      
	      }
	      encode= "GB18030";
	      if (str.equals(new String(str.getBytes(encode), encode))) {      //判断是不是GBK
	           String s4 = encode;      
	          return s4;      
	      }
		 } catch (Exception e) {
			e.printStackTrace();
		 }
		 return "";
	}

 

 

@RequestMapping(value="/asyncContractInto.do")
	@ResponseBody
	public JSONObject asyncContractInto(HttpServletRequest request,HttpServletResponse response,@RequestParam String cdata) {
		String realIpAdrress = IpUtils.getRealIpAdrress(request);
		try {
			request.setCharacterEncoding("utf-8");
			String str=cdata;
			String code = getCode(str);
			logger.info("原始合同数据编码格式:"+code);
			logger.info("remote ip "+realIpAdrress);
			//if(IP.indexOf(realIpAdrress)==-1) return new ResultJsonObj().unOk("", "IP校验不过").translateToJSON();
			if(T.isBlank(cdata)) return new ResultJsonObj().unOk("", "请求参数为空").translateToJSON();
			String strx=new String(str.getBytes("ISO-8859-1"),"UTF-8");
			logger.info("cdata u8 decode:= "+strx);
			String decode = URLDecoder.decode(strx);
			logger.info("cdata := "+decode);
			dealerContractService.asynContract(decode);
			return new ResultJsonObj().ok("更新成功", "ok").translateToJSON();
		}catch (DateDuplictException e){
			return new ResultJsonObj().code(e.getCode(),e.getMsg()).translateToJSON();
		}catch (AsynDealerException e){
			return new ResultJsonObj().code(e.getCode(),e.getMsg()).translateToJSON();
		}catch (RefundException e){
			return new ResultJsonObj().code(e.getCode(),e.getMsg()).translateToJSON();
		}catch (NoneDealerException e) {
			return new ResultJsonObj().code(e.getCode(),e.getMsg()).translateToJSON();
		}catch(AsynAuthException e){
			logger.info("car server exception :="+e.getMsg());
			return new ResultJsonObj().code(e.getCode(),e.getMsg()).translateToJSON();
		}catch(AddBrandNumException e) {
			return new ResultJsonObj().code(e.getCode(),e.getMsg()).translateToJSON();
		}catch(Exception e) {
			e.printStackTrace();
			return new ResultJsonObj().error("", "服务器异常!"+e.getMessage()).translateToJSON();
		}
	}