js如何调用servlet

<form action="YourServletURL" method="post">
    <input type="text" name="paramName" />
    <input type="submit" value="Submit" />
</form>

var xhr = new XMLHttpRequest();
xhr.open('POST', 'YourServletURL', true);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
        console.log(xhr.responseText);
    }
};
xhr.send('paramName=value');

fetch('YourServletURL', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
    },
    body: 'paramName=value'
})
.then(response => response.text())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");