这是我拥有的JSON字符串:
{"attributes":[{"nm":"ACCOUNT","lv":[{"v":{"Id":null,"State":null},"vt":"java.util.Map","cn":1}],"vt":"java.util.Map","status":"SUCCESS","lmd":13585},{"nm":"PROFILE","lv":[{"v":{"Party":null,"Ads":null},"vt":"java.util.Map","cn":2}],"vt":"java.util.Map","status":"SUCCESS","lmd":41962}]}
我需要将上述JSON String转换为Pretty Print JSON Output(使用Jackson),如下所示:
String
{ "attributes": [ { "nm": "ACCOUNT", "lv": [ { "v": { "Id": null, "State": null }, "vt": "java.util.Map", "cn": 1 } ], "vt": "java.util.Map", "status": "SUCCESS", "lmd": 13585 }, { "nm": "PROFILE "lv": [ { "v": { "Party": null, "Ads": null }, "vt": "java.util.Map", "cn": 2 } ], "vt": "java.util.Map", "status": "SUCCESS", "lmd": 41962 } ] }
有人可以根据我上面的示例为我提供示例吗?如何实现这种情况?我知道有很多例子,但我无法正确理解。一个简单的例子将对您的帮助有所帮助。
更新:
以下是我正在使用的代码:
ObjectMapper mapper = new ObjectMapper(); System.out.println(mapper.defaultPrettyPrintingWriter().writeValueAsString(jsonString));
但这与我如上所述需要输出的方式不兼容。
这是我用于上述JSON的POJO:
public class UrlInfo implements Serializable { private List<Attributes> attribute; } class Attributes { private String nm; private List<ValueList> lv; private String vt; private String status; private String lmd; } class ValueList { private String vt; private String cn; private List<String> v; }
谁能告诉我我是否为JSON获得了正确的POJO?
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));
下面的行打印出这样的内容:
System.out.println(indented); { "attributes" : [ { "nm" : "ACCOUNT", "error" : "null SYS00019CancellationException in CoreImpl fetchAttributes\n java.util.concurrent.CancellationException\n\tat java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:231)\n\tat java.util.concurrent.FutureTask.", "status" : "ERROR" } ] }
这是我需要表现出来的方式。但是当我将它添加到这样的模型中时:
model.addAttribute("response", (indented));
然后在resultform jsp页面中显示出来,如下所示:
<fieldset> <legend>Response:</legend> <strong>${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 我需要上面打印出来的方式。谁能告诉我为什么会这样发生?
要缩进任何旧的JSON,只需将其绑定为Object,例如:
Object
Object json = mapper.readValue(input, Object.class);
然后以缩进形式将其写出:
String indented = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(json);
这避免了您必须定义实际的POJO来映射数据。
或者,您也可以使用JsonNode(JSON树)。
JsonNode