如何放心地从REST响应(json或xml)中提取字段值？

Question

我想从字符串类型的REST响应（json或xml）中提取值。我尝试了以下代码：

final Response response = new ResponseBuilder().setContentType("application/json").setStatusCode(200).setBody("{\"message\":\"hello\"}").build();
Object object = response.path("message");
System.out.println(object);

但是它包含了

Exception in thread "main" java.lang.NullPointerException: Cannot invoke method getObjectMapperConfig() on null object
    at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:48)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:35)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
    at io.restassured.internal.RestAssuredResponseOptionsGroovyImpl.jsonPath(RestAssuredResponseOptionsGroovyImpl.groovy:358)

根本原因是RestAssuredConfig对象在RestAssuredResseOptionsGroovyImpl中为空

那么，既然我已经有了字符串响应，那么在没有get（）或post（）的情况下，如何从原始字符串响应正确构造Response对象呢？

Answer 1

您可以尝试以下操作：

RestAssuredResponseOptionsImpl response = new RestAssuredResponseImpl();
response.setConfig(RestAssuredConfig.config());
response.setRpr(new ResponseParserRegistrar());
response.setContentType("application/json");
response.setStatusCode(200);
response.setContent("{\"message\":\"hello\"}");
Object message = response.path("message");
System.out.println(message);