如何使用java中的XPath / JsonPath更改json文件中的值 [英] How to change values in a json file using XPath/JsonPath in java

问题描述

这里是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，直接给出XPath / JsonPath Like

I want to change the value of name.by directly giving XPath/JsonPath Like

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

($.session.name).changevalue("MYSESSINID") this is just a Example

我正确使用jackson库并使用下面的通过XPath读取的代码

I am correctly using jackson library and using the below code for reading via XPath

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);

因此他们可以通过XPath更改名称

so is their a way to change the name by XPath

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

仍在文件中无效。

推荐答案

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，这样您就不必将其传入所有电话。

You can configure the default JsonProvider so you don't have to pass it in all calls.

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