Spring MVC - 如何在 Rest Controller 中将简单字符串作为 JSON 返回 [英] Spring MVC - How to return simple String as JSON in Rest Controller

问题描述

我的问题本质上是对的跟进这个问题.

My question is essentially a follow-up to this question.

@RestController
public class TestController
{
    @RequestMapping("/getString")
    public String getString()
    {
        return "Hello World";
    }
}

在上面，Spring 会将Hello World"添加到响应正文中.如何将字符串作为 JSON 响应返回?我知道我可以添加引号，但这感觉更像是一种黑客攻击.

In the above, Spring would add "Hello World" into the response body. How can I return a String as a JSON response? I understand that I could add quotes, but that feels more like a hack.

请提供任何示例以帮助解释此概念.

Please provide any examples to help explain this concept.

注意:我不想将其直接写入 HTTP 响应正文，我想以 JSON 格式返回字符串(我正在使用我的控制器使用 RestyGWT 要求响应为有效的 JSON格式).

Note: I don't want this written straight to the HTTP Response body, I want to return the String in JSON format (I'm using my Controller with RestyGWT which requires the response to be in valid JSON format).

推荐答案

Either return text/plain(如 仅从 Spring MVC 3 控制器返回字符串消息) 或者将你的字符串包裹起来

Either return text/plain (as in Return only string message from Spring MVC 3 Controller) OR wrap your String is some object

public class StringResponse {

    private String response;

    public StringResponse(String s) { 
       this.response = s;
    }

    // get/set omitted...
}

将您的响应类型设置为 MediaType.APPLICATION_JSON_VALUE (= "application/json")

@RequestMapping(value = "/getString", method = RequestMethod.GET,
                produces = MediaType.APPLICATION_JSON_VALUE)

你会得到一个类似于

{  "response" : "your string value" }

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