flask+ajax post 400错误_编程技术网-程序员技术内容聚合平台

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前端代码

<!DOCTYPE html>
<html lang="en">
<head>
    <!--<meta charset="UTF-8">-->
    <!--<meta http-equiv="Access-Control-Allow-Origin" content="*" />-->
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

    <title>Title</title>
</head>
<meta charset="UTF-8">
<title>showImages</title>
<style type="text/css">
    .float{
        float:left;
        width : 200px;
        height: 200px;
        overflow: hidden;
        border: 1px solid #CCCCCC;
        border-radius: 10px;
        padding: 5px;
        margin: 5px;
    }
    img{
        position: relative;
    }
    .result{
        width: 200px;
        height: 200px;
        text-align: center;
        box-sizing: border-box;
    }


    #file_input{
        display: none;
    }


    .delete{
        width: 200px;
        height:200px;
        position: absolute;
        text-align: center;
        line-height: 200px;
        z-index: 10;
        font-size: 30px;
        background-color: rgba(255,255,255,0.8);
        color: #777;
        opacity: 0;
        transition-duration: 0.7s;
        -webkit-transition-duration: 0.7s;
    }


    .delete:hover{
        cursor: pointer;
        opacity: 1;
    }



</style>


<script src="/uploads/allimg/210417/20094251E-0.jpg"></script>
<script type="text/javascript">


window.onload = function(){
    var input = document.getElementById("file_input");
    var result;
    var dataArr = []; // 储存所选图片的结果(文件名和base64数据)
    var fd;  //FormData方式发送请求
    var oSelect = document.getElementById("select");
    var oAdd = document.getElementById("add");
    var oSubmit = document.getElementById("submit");
    var oInput = document.getElementById("file_input");

    if(typeof FileReader==='undefined'){
        alert("抱歉，你的浏览器不支持 FileReader");
        input.setAttribute('disabled','disabled');
    }else{
        input.addEventListener('change',readFile,false);
    }　　　　　//handler


    function readFile(){
        fd = new FormData();
        var iLen = this.files.length;
        for(var i=0;i<iLen;i++){
            if (!input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp/i)){　　//判断上传文件格式
                return alert("上传的图片格式不正确，请重新选择");
            }
            var reader = new FileReader();
            fd.append(i,this.files[i]);
            reader.readAsDataURL(this.files[i]);  //转成base64
            reader.fileName = this.files[i].name;

            reader.onload = function(e){
                var imgMsg = {
                    name : this.fileName,//获取文件名
                    base64 : this.result   //reader.readAsDataURL方法执行完后，base64数据储存在reader.result里
                }
                dataArr.push(imgMsg);
                result = '<div class="delete">delete</div><div class="result">![]()</div>';
                var div = document.createElement('div');
                div.innerHTML = result;
                div['className'] = 'float';
                document.getElementsByTagName('body')[0].appendChild(div);  　　//插入dom树
                var img = div.getElementsByTagName('img')[0];
                img.onload = function(){
                    var nowHeight = ReSizePic(this); //设置图片大小
                    this.parentNode.style.display = 'block';
                    var oParent = this.parentNode;
                    if(nowHeight){
                        oParent.style.paddingTop = (oParent.offsetHeight - nowHeight)/2 + 'px';
                    }
                }
                div.onclick = function(){
                    $(this).remove();                  // 在页面中删除该图片元素
                }
            }
        }
    }


    function send(){
        var submitArr = [];
        $('.subPic').each(function () {
                submitArr.push({
                    name: $(this).attr('alt'),
                    base64: $(this).attr('src')
                });
            }
        );
        $.ajax({
            url : 'http://127.0.0.1:5000/predict',
            type : 'post',
            data : JSON.stringify(submitArr),
            dataType: 'json',
            enctype:'multipart/form-data',
            //contentType:"application / x-www-form-urlencoded",
            contentType: 'application/json;charset=UTF-8',
            processData: false,   //用FormData传fd时需有这两项

            success : function(data){
                console.log('返回的数据：'+JSON.stringify(data))
          　}
        })
    }




    oSelect.onclick=function(){
        oInput.value = "";   // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
        //清空已选图片
        $('.float').remove();
        oInput.click();
    }


    oAdd.onclick=function(){
        oInput.value = "";   // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
        oInput.click();
    }


    oSubmit.onclick=function(){
        if(!dataArr.length){
            return alert('请先选择文件');
        }
        send();
    }
}
/*
 用ajax发送fd参数时要告诉jQuery不要去处理发送的数据，
 不要去设置Content-Type请求头才可以发送成功，否则会报“Illegal invocation”的错误，
 也就是非法调用，所以要加上“processData: false,contentType: false,”
 * */


function ReSizePic(ThisPic) {
    var RePicWidth = 200; //这里修改为您想显示的宽度值

    var TrueWidth = ThisPic.width; //图片实际宽度
    var TrueHeight = ThisPic.height; //图片实际高度

    if(TrueWidth>TrueHeight){
        //宽大于高
        var reWidth = RePicWidth;
        ThisPic.width = reWidth;
        //垂直居中
        var nowHeight = TrueHeight * (reWidth/TrueWidth);
        return nowHeight;  //将图片修改后的高度返回，供垂直居中用
    }else{
        //宽小于高
        var reHeight = RePicWidth;
        ThisPic.height = reHeight;
    }
}



</script>
</head>
    <body>
            <div class="container">
                <label>请选择一个图像文件：</label>
                <button id="select">(重新)选择图片</button>
                <button id="add">(追加)图片</button>
                <input type="file" id="file_input" name="image" multiple/> <!--用input标签并选择type=file，记得带上multiple，不然就只能单选图片了-->
                <button id="submit" type="submit" class="subPic">提交</button>
            </div>
    </body>
</html><!DOCTYPE html>
<html lang="en">
<head>
 <!--<meta charset="UTF-8">-->
 <!--<meta http-equiv="Access-Control-Allow-Origin" content="*" />--> <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 <title>Title</title>
</head>
<meta charset="UTF-8">
<title>showImages</title>
<style type="text/css">
 .float{
        float:left;
        width : 200px;
        height: 200px;
        overflow: hidden;
        border: 1px solid #CCCCCC;
        border-radius: 10px;
        padding: 5px;
        margin: 5px;
    }
    img{
        position: relative;
    }
    .result{
        width: 200px;
        height: 200px;
        text-align: center;
        box-sizing: border-box;
    }
    #file_input{
        display: none;
    }
    .delete{
        width: 200px;
        height:200px;
        position: absolute;
        text-align: center;
        line-height: 200px;
        z-index: 10;
        font-size: 30px;
        background-color: rgba(255,255,255,0.8);
        color: #777;
        opacity: 0;
        transition-duration: 0.7s;
        -webkit-transition-duration: 0.7s;
    }
    .delete:hover{
        cursor: pointer;
        opacity: 1;
    }
</style>
<script src="/uploads/allimg/210417/20094251E-0.jpg"></script>
<script type="text/javascript">
window.onload = function(){
    var input = document.getElementById("file_input");
    var result;
    var dataArr = []; // 储存所选图片的结果(文件名和base64数据)
    var fd;  //FormData方式发送请求
 var oSelect = document.getElementById("select");
    var oAdd = document.getElementById("add");
    var oSubmit = document.getElementById("submit");
    var oInput = document.getElementById("file_input");
    if(typeof FileReader==='undefined'){
        alert("抱歉，你的浏览器不支持 FileReader");
        input.setAttribute('disabled','disabled');
    }else{
        input.addEventListener('change',readFile,false);
    } //handler
    function readFile(){
        fd = new FormData();
        var iLen = this.files.length;
        for(var i=0;i<iLen;i++){
            if (!input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp/i)){ //判断上传文件格式
 return alert("上传的图片格式不正确，请重新选择");
            }
            var reader = new FileReader();
            fd.append(i,this.files[i]);
            reader.readAsDataURL(this.files[i]);  //转成base64
            reader.fileName = this.files[i].name;
            reader.onload = function(e){
                var imgMsg = {
                    name : this.fileName,//获取文件名
 base64 : this.result   //reader.readAsDataURL方法执行完后，base64数据储存在reader.result里
 }
                dataArr.push(imgMsg);
                result = '<div class="delete">delete</div><div class="result"><img class="subPic" src="'+this.result+'" alt="'+this.fileName+'"/></div>';
                var div = document.createElement('div');
                div.innerHTML = result;
                div['className'] = 'float';
                document.getElementsByTagName('body')[0].appendChild(div);  //插入dom树
 var img = div.getElementsByTagName('img')[0];
                img.onload = function(){
                    var nowHeight = ReSizePic(this); //设置图片大小
 this.parentNode.style.display = 'block';
                    var oParent = this.parentNode;
                    if(nowHeight){
                        oParent.style.paddingTop = (oParent.offsetHeight - nowHeight)/2 + 'px';
                    }
                }
                div.onclick = function(){
                    $(this).remove();                  // 在页面中删除该图片元素
 }
            }
        }
    }
    function send(){
        var submitArr = [];
        $('.subPic').each(function () {
                submitArr.push({
                    name: $(this).attr('alt'),
                    base64: $(this).attr('src')
                });
            }
        );
        $.ajax({
            url : 'http://127.0.0.1:5000/predict',
            type : 'post',
            data : JSON.stringify(submitArr),
            dataType: 'json',
            enctype:'multipart/form-data',
            //contentType:"application / x-www-form-urlencoded",
            contentType: 'application/json;charset=UTF-8',
            processData: false,   //用FormData传fd时需有这两项
 success : function(data){
                console.log('返回的数据：'+JSON.stringify(data))
          }
        })
    }
    oSelect.onclick=function(){
        oInput.value = "";   // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
 //清空已选图片
 $('.float').remove();
        oInput.click();
    }
    oAdd.onclick=function(){
        oInput.value = "";   // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
 oInput.click();
    }
    oSubmit.onclick=function(){
        if(!dataArr.length){
            return alert('请先选择文件');
      }
        send();
    }
}
/*
 用ajax发送fd参数时要告诉jQuery不要去处理发送的数据，
 不要去设置Content-Type请求头才可以发送成功，否则会报“Illegal invocation”的错误，
 也就是非法调用，所以要加上“processData: false,contentType: false,”
 * */
function ReSizePic(ThisPic) {
    var RePicWidth = 200; //这里修改为您想显示的宽度值
 var TrueWidth = ThisPic.width; //图片实际宽度
 var TrueHeight = ThisPic.height; //图片实际高度
 if(TrueWidth>TrueHeight){
        //宽大于高
 var reWidth = RePicWidth;
        ThisPic.width = reWidth;
        //垂直居中
 var nowHeight = TrueHeight * (reWidth/TrueWidth);
        return nowHeight;  //将图片修改后的高度返回，供垂直居中用
 }else{
        //宽小于高
 var reHeight = RePicWidth;
        ThisPic.height = reHeight;
    }
}
</script>
</head>
 <body> <div class="container">
 <label>请选择一个图像文件：</label>
 <button id="select">(重新)选择图片</button>
 <button id="add">(追加)图片</button>
 <input type="file" id="file_input" name="image" multiple/> <!--用input标签并选择type=file，记得带上multiple，不然就只能单选图片了-->
 <button id="submit" type="submit" class="subPic">提交</button>
 </div> </body></html>

pyhton代码

@app.route('/predict', methods=['POST'])
def predict():
    # 获取输入数据
 file = request.files['file']
    #file = request.files('file',None)
 img_bytes = file.read()

postman是成功了的，命令行一直报400错误，求助大佬帮忙看看