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

2022-01-17 00:00:00 http-headers http content-type java jsp

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

I am created some jsp file that returns as a response some json string. But I see that the Content-Type is set to txt automatically

我的jsp代码看起来像

My jsp code looks like 

<%@ 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

How can I perform something like 

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

在这个例子中?

推荐答案

你可以通过页面指令.

例如:

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

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

    • JSP 文件使用的 MIME 类型和字符编码它发送给客户端的响应.您可以使用任何 MIME 类型或对 JSP 容器有效的字符集.默认 MIME类型为 text/html，默认字符集为 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.

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