Merge pull request #4445 from psysane/master

[BAEL-1631] Count with JsonPath

json-path/src/main/resources/online_store.json

@@ -0,0 +1,23 @@
+{
+    "items":{
+        "book":[
+            {
+                "author":"Arthur Conan Doyle",
+                "title":"Sherlock Holmes",
+                "price":8.99
+            },
+            {
+                "author":"J. R. R. Tolkien",
+                "title":"The Lord of the Rings",
+                "isbn":"0-395-19395-8",
+                "price":22.99
+            }
+        ],
+        "bicycle":{
+            "color":"red",
+            "price":19.95
+        }
+    },
+    "url":"mystore.com",
+    "owner":"baeldung"
+}

json-path/src/test/java/com/baeldung/jsonpath/introduction/JsonPathUnitTest.java

@@ -0,0 +1,46 @@
+package com.baeldung.jsonpath.introduction;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.Map;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.jayway.jsonpath.JsonPath;
+
+import net.minidev.json.JSONArray;
+
+public class JsonPathUnitTest {
+
+    private static String json;
+    private static File jsonFile = new File("src/main/resources/online_store.json");
+
+    private static String readFile(File file, Charset charset) throws IOException {
+        return new String(Files.readAllBytes(file.toPath()), charset);
+    }
+
+    @BeforeClass
+    public static void init() throws IOException {
+        json = readFile(jsonFile, StandardCharsets.UTF_8);
+    }
+
+    @Test
+    public void shouldMatchCountOfObjects() {
+        Map<String, String> objectMap = JsonPath.read(json, "$");
+        assertEquals(3, objectMap.keySet()
+            .size());
+    }
+
+    @Test
+    public void shouldMatchCountOfArrays() {
+        JSONArray jsonArray = JsonPath.read(json, "$.items.book[*]");
+        assertEquals(2, jsonArray.size());
+    }
+
+}