如何使用java中的XPath / JsonPath更改json文件中的值

这是json文件

{ "session": { "name":"JSESSIONID", "value":"5864FD56A1F84D5B0233E641B5D63B52" }, "loginInfo": { "loginCount":77, "previousLoginTime":"2014-12-02T11:11:58.561+0530" } } 

我想更改name.by的值直接给XPath / JsonPath Like

($.session.name).changevalue("MYSESSINID")这只是一个例子

我正确使用jackson库并使用以下代码通过XPath进行读取

 ObjectMapper mapper = new ObjectMapper(); Object jsonObj=mapper.readValue(new File(Json file), Object.class); Object name=PropertyUtils.getProperty(jsonObj, "session.name"); System.out.println("Name:"+name); 

他们是一种通过XPath更改名称的方法

 PropertyUtils.setProperty(jsonObj, "session.value", "new value"); 

仍然在文件中它无法正常工作。

Answer 1

使用Jayways JsonPath您可以：

 private static final Configuration configuration = Configuration.builder() .jsonProvider(new JacksonJsonNodeJsonProvider()) .mappingProvider(new JacksonMappingProvider()) .build(); @Test public void a_value_can_be_updated(){ String originalJson = "{\n" + "\"session\":\n" + " {\n" + " \"name\":\"JSESSIONID\",\n" + " \"value\":\"5864FD56A1F84D5B0233E641B5D63B52\"\n" + " },\n" + "\"loginInfo\":\n" + " {\n" + " \"loginCount\":77,\n" + " \"previousLoginTime\":\"2014-12-02T11:11:58.561+0530\"\n" + " }\n" + "}"; JsonNode updatedJson = JsonPath.using(configuration).parse(originalJson).set("$.session.name", "MYSESSINID").json(); System.out.println(updatedJson.toString()); } 

您可以配置默认的JsonProvider，因此您不必在所有调用中传递它。

Answer 2

 PropertyUtils.setProperty(jsonObj, "session.value", "new value"); PropertyUtils.setProperty(jsonObj, "session.name", "new name"); mapper.writeValue(Json File ,jsonObj);