检查HTTP POST请求的内容类型到Java servlet

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/checkContentType")
public class CheckContentTypeServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String contentType = request.getContentType();
        if (contentType != null) {
            if (contentType.equals("application/json")) {
                // 处理JSON数据
            } else if (contentType.equals("application/x-www-form-urlencoded")) {
                // 处理表单数据
            } else if (contentType.equals("multipart/form-data")) {
                // 处理文件上传数据
            } else {
                // 其他类型数据
            }
        } else {
            // 没有指定内容类型
        }
    }
}