js给servlet传值的类型

// JavaScript
window.location.href = "servlet?name=John&age=30";

// Servlet
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));

<!-- HTML -->
<form action="servlet" method="post" enctype="multipart/form-data">
    <input type="text" name="name">
    <input type="number" name="age">
    <input type="file" name="file">
    <button type="submit">Submit</button>
</form>

// Servlet
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));
Part filePart = request.getPart("file");

// JavaScript
let data = {
    name: "John",
    age: 30,
    hobbies: ["reading", "sports"]
};

fetch('servlet', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify(data)
});

// Servlet
BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
    sb.append(line);
}
String jsonString = sb.toString();
JSONObject json = new JSONObject(jsonString);
String name = json.getString("name");
int age = json.getInt("age");
JSONArray hobbies = json.getJSONArray("hobbies");