java - 在 jsp 文件中将 Content-Type 设置为 application/json

Question

我创建了一些 jsp 文件，它作为响应返回一些 json 字符串。但是我看到 Content-Type 自动设置为 txt

我的jsp代码看起来像

<%@ page import="java.util.Random" %>
<%@ page language="java" %>
<%@ page session="false" %>

<%
  String retVal = "// some json string";

     int millis = new Random().nextInt(1000);
     //    System.out.println("sleeping for " + millis + " millis");
     Thread.sleep(millis);
%>
<%=retVal%>

我怎样才能执行类似的操作

setHeader("Content-Type", "application/json");

在这个例子中？

Answer 1

您可以通过 Page directive .

例如:

<%@ page language="java" contentType="application/json; charset=UTF-8"
    pageEncoding="UTF-8"%>

• contentType="mimeType [ ;charset=characterSet ]"|"text/html;charset=ISO-8859-1"

The MIME type and character encoding the JSP file uses for the response it sends to the client. You can use any MIME type or character set that are valid for the JSP container. The default MIME type is text/html, and the default character set is ISO-8859-1.