ajax提交到后台数据成功但返回不走success而走的error

时间:2021-04-27 18:57:59

下面是ajax代码和Controller层代码,期初以为是后台程序写错了。

 $("#sourcefile").ajaxSubmit({     
type: "post",
dataType: "json", // 'xml', 'script', or 'json' (expected server response type)
url: "/springMVC/upload/up",
success: function (result) {
if (result) {
alert(result.col0);
}

},
error:function(data, XMLHttpRequest, textStatus, errorThrown){
alert(1);
}
});
 @RequestMapping(value="/upload/up")       public   @ResponseBody ExcelName upload(@RequestParam("sourceFile") MultipartFile sourceFile, HttpServletRequest request, ModelMap model,HttpServletResponse response) {       //判断文件是否为空        if (sourceFile==null) return null;        //获取文件名        String name=sourceFile.getOriginalFilename();        System.out.println("name");        //进一步判断文件是否为空(即判断其大小是否为0或其名称是否为null)        long size =sourceFile.getSize();        if (name==null ||("").equals(name) && size==0) return null;        //批量导入。参数:文件名,文件。        List<ExcelName> cpolicyList = ExcelUtils.batchImport(name,sourceFile);      //迭代添加信息(注:实际上这里也可以直接将cpolicyList集合作为参数,在Mybatis的相应映射文件中使用foreach标签进行批量添加。)        for( ExcelName customer:cpolicyList){        colDataService.insertData(customer);        }                       ExcelName e1=new ExcelName();        e1.setCol0("success");        return e1;}




后打点跟踪后台发现,原来因为上传按键type写成了submit导致提交了一次action,致使ajax未获取到返回结果走了error。

下面是修改正确后的jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>上传</title>
<script type="text/javascript" src="./jquery-3.1.1.js"></script>
<script type="text/javascript" src="./jquery.form.js"></script>
<script type="text/javascript">

function submitImport(){
var epath = $('#source_file').val();

if(epath==""){
alert( '导入文件不能为空!');
return;
}

if (epath.substring(epath.lastIndexOf(".") + 1).toLowerCase()!="xlsx") {
alert( '导入文件类型必须为excel!');
return;
}

$("#sourcefile").ajaxSubmit({
type: "post",
dataType: "json", // 'xml', 'script', or 'json' (expected server response type)
url: "/springMVC/upload/up",
success: function (result) {
if (result) {
alert(result.col0);
}

},
error:function(data, XMLHttpRequest, textStatus, errorThrown){
alert(1);
}
});
}
//partExport
function downloadTemplate() {
document.sourcefile.action = "/springMVC/upload/partExport";
form.submit(); //表单提交
}


</script>
</head>
<body>
<div>
<form id="sourcefile" name="sourcefile" action="" method="post" enctype="multipart/form-data">
<input type="button" value="添 加" onClick="addAirLine()" />
<input style="margin-left: 20px;" id="source_file" name="sourceFile" type="file" value="选择文件" />
<input style="margin-left: 20px;" data-loading-text="请勿重复提交" type="button" value="上 传" onClick="submitImport()">
<input style="margin-left: 20px;" type="submit" value="下载模板" onClick="downloadTemplate();">
</form>
</div>
</body>
</html>