Determine whether form filling is repeated

Written the problem encountered when judging whether the company name was repeated, and then corrected it
Service layer

	// 判断公司名称是否重复
    @SuppressWarnings("unchecked")
	public boolean isNameExsit(String companyname){
    	if (StringUtils.isBlank(companyname)) {
			return false;
		}
		写sql语句判断公司名称重复的次数
    	String sql = "select count(companyname) from T_CASE_BASEINFO where caseno not like 'S%' and isDelete != 1 and companyname = ?";
		List<BigDecimal> result = createSQLQuery(sql, companyname).list();
		return result.get(0).compareTo(BigDecimal.ZERO) != 0; // 返回结果 ‘！=0’
    }

controller layer

	// 验证公司名称是否重复
	@RequestMapping(params="method=isNameExsit")
    public void isNameExsit(HttpServletRequest request , HttpServletResponse response) throws UnsupportedEncodingException{
    	// 获取前台填写的公司名称
    	String companyname = request.getParameter("companyname");
    	// 判断公司名称是否为空
        if (StringUtils.isNotBlank(companyname)) {
        	// 汉字解码
        	companyname = new String(java.net.URLDecoder.decode(companyname, "UTF-8"));
        }else{
        	companyname="";
        }
        // 调用service方法，判断是否正确
        boolean  isName = caseBaseinfoService.isNameExsit(companyname);
        if (isName) { // 如果正确
            SpringMVCUtils.render(response, ServletUtils.TEXT_TYPE, "yes");
        }else{
        	SpringMVCUtils.render(response, ServletUtils.TEXT_TYPE, "no");
		}
        
    }

jsp page

		//公司名称
		var companyname = $("#companyname").val();
        if(companyname==""){
           alertTip('企业名称不能为空','companyname');
           flags = false;
        }else{
	        $.ajax({
		        	type : "get",
					async : false,
	        		url:"${ctx}/blyw/blyw.do?method=isNameExsit&companyname="+encodeURI(encodeURI(companyname.trim())), // 二次编码
	        		success: function(companyname){
		        		if (companyname=='yes') {
							alertTip('企业名称已重复','companyname');
							 flags = false;
						}
	        		}
	        	});
        }


<tr>
	<th><span class="tRed">*</span>公司名称</th>
	<td colspan="3">
		<input id="companyname" class="text" value="${caseinfo.companyname}" name="companynamec">
	</td>
</tr>