Javascript 发送此AJAX帖子数据的正确内容类型
我在使用ajax post发送base64图像数据时遇到问题 我想我的内容类型值是错误的,但我尝试了application/json、text/json和image/jpeg,但没有成功 JavascriptJavascript 发送此AJAX帖子数据的正确内容类型,javascript,java,ajax,spark-java,spark-framework,Javascript,Java,Ajax,Spark Java,Spark Framework,我在使用ajax post发送base64图像数据时遇到问题 我想我的内容类型值是错误的,但我尝试了application/json、text/json和image/jpeg,但没有成功 Javascript function sendFormData(fD) { var urls = fD.get('urls'); console.log('urls', urls); var xhr = new XMLHttpRequest();
function sendFormData(fD)
{
var urls = fD.get('urls');
console.log('urls', urls);
var xhr = new XMLHttpRequest();
xhr.open('POST', '/editsongs.update_artwork');
alert(urls);
xhr.setRequestHeader("Content-type", "image/jpeg");
xhr.send(urls);
}
浏览器控制台显示
["data:image/jpeg;base64,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…
Java服务器代码
public String updateArtwork(Request request, Response response)
{
System.out.println("Received artwork");
for(String s:request.queryParams())
{
System.out.println("---"+s);
}
System.out.println("ReadParms");
return "";
}
仅输出
Received artwork
ReadParms
更新为以表单形式发送
// Once we got everything, time to retrieve our objects
function sendData()
{
var fD = new FormData();
// send Files data directly
var files = imgList.filter(
function isFile(obj)
{
return obj.type === 'file';
}
);
files.forEach(
function appendToFD(obj)
{
fD.append('files[]', obj.file);
}
);
// for elems, we will need to grab the data from the server
var elems = imgList.filter(
function isElem(obj)
{
return obj.type === "element";
}
);
var urls = elems.map(
function grabURL(obj)
{
return obj.element.src;
}
);
if (urls.length)
fD.append('urls', JSON.stringify(urls));
sendFormData(fD);
};
function sendFormData(fD)
{
// but here we will just log the formData's content
var files = fD.getAll('files[]');
console.log('files: ', files);
var urls = fD.get('urls');
console.log('urls', urls);
var xhr = new XMLHttpRequest();
xhr.open('POST', '/editsongs.update_artwork');
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(fD);
}
然后在服务器上我有
public String updateArtwork(Request request, Response response)
{
System.out.println("Received artwork");
for(String s:request.queryParams())
{
System.out.println("***"+s);
System.out.println(request.queryParams(s));
}
System.out.println("ReadParms");
return "";
}
及其产出
Received artwork
***-----------------------------330219842643
Content-Disposition: form-data; name
"urls"
["data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBxMSEhUSExIWFhUXFxgXGBcYFRgXFxkdGBcWGBgYFx0YHSggHR0lHRkYITEhJSkrLi4uFyA1ODMtNygtLisBCgoKDg0OFQ8PFSsZFRkrLSstLSstKysrLS03KystLSstKy03LSstLSstNzc3KysrLS0tKysrKysrKysrKysrK//AABEIAKoBKQMBIgACEQEDEQH...."]
-----------------------------330219842643--
ReadParms
所以我现在得到了数据,但我真的不明白如何在Java中解析内容配置部分
这段代码最初不是我写的,因为你可以看到FormData是构建的,它不是来自实际的表单。我的第一次尝试是尝试从FormData中提取数据并以不同的方式发送,另一种方法是不首先存储在FormData中,但不知道如何执行
更新2
尝试只发送第一个url,而不是formdata或一堆url,因为实际上只有一个url。但它不起作用,服务器没有收到任何内容
function sendFormData(urls)
{
console.log('urls', urls[0]);
var xhr = new XMLHttpRequest();
xhr.open('POST', '/editsongs.update_artwork');
xhr.setRequestHeader("Content-type", "text/json");
alert(JSON.stringify(urls[0]));
xhr.send(JSON.stringify(urls[0]));
}
您正试图使用
queryParams()
查看正文中的数据,这将为您提供位于url中的查询参数
使用
body()?是的,它是一个FormData对象,但是数据不是用我的代码从FormData中提取出来的也许这有帮助我不熟悉你在服务器端做什么,但是看起来你试图用queryParams()
获取请求体,这将在url中获取查询参数。这也解释了为什么在第二个示例中它被截断,URL只能这么长。找出如何使用第一个方法从正文(getReader()
?)读取数据,并以这种方式获取Base64字符串