java - 如何在 JSP 页面中显示 Pretty Print JSON 字符串

Question

我想在 JSP 页面中显示一个 JSON 字符串。我正在使用 Spring MVC 框架。下面是代码

String result = restTemplate.getForObject(url.toString(), String.class);

ObjectMapper mapper = new ObjectMapper();
Object json = mapper.readValue(result, Object.class);

String indented = mapper.defaultPrettyPrintingWriter().writeValueAsString(json);

System.out.println(indented);//This print statement show correct way I need

model.addAttribute("response", (indented));

这一行 System.out.println(indented); 打印出这样的东西-

{
  "attributes" : [ {
    "nm" : "ACCOUNT",
    "error" : "null SYS00019CancellationException in CoreImpl fetchAttributes\n java.util.concurrent.CancellationException\n\tat java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:231)\n\tat java.util.concurrent.FutureTask.",
    "status" : "ERROR"
  } ]
}

这是我需要使用 JSP 页面显示的方式。但是当我像这样将它添加到模型中时-

model.addAttribute("response", (indented));

然后在 resultform.jsp 页面中显示出来，如下所示-

    <fieldset>
        <legend>Response:</legend>
            <strong>${response}</strong><br />

    </fieldset>

我在浏览器上得到这样的东西-

{ "attributes" : [ { "nm" : "ACCOUNT", "error" : "null    
SYS00019CancellationException in CoreImpl fetchAttributes\n 
java.util.concurrent.CancellationException\n\tat 
java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:231)\n\tat 
java.util.concurrent.FutureTask.", "status" : "ERROR" } ] }

我不需要。不知道为什么要这样包起来？我需要它上面打印出来的方式，就像这样。

{
  "attributes" : [ {
    "nm" : "ACCOUNT",
    "error" : "null SYS00019CancellationException in CoreImpl fetchAttributes\n java.util.concurrent.CancellationException\n\tat java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:231)\n\tat java.util.concurrent.FutureTask.",
    "status" : "ERROR"
  } ]
}

谁能告诉我为什么会这样？我怎样才能按照我需要的方式在 JSP 页面中显示它？

Answer 1

White space characters are usually collapsed in HTML (by default).这些字符包括换行符。将 JSON 转储到 <pre> 中.

<pre>
${response}
</pre>

其他解决方案:https://stackoverflow.com/a/10474709/139010