json tutorials

json-tutorials/json-gson-example/pom.xml

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+<?xml version="1.0"?>
+<project
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
+	xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>net.aimeizi</groupId>
+		<artifactId>json-tutorials</artifactId>
+		<version>1.0.0</version>
+	</parent>
+	<artifactId>json-gson-example</artifactId>
+	<packaging>jar</packaging>
+	<name>json-gson-example</name>
+	<url>http://maven.apache.org</url>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.6</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+			<version>1.7.1</version>
+		</dependency>
+	</dependencies>
+
+</project>

json-tutorials/json-gson-example/src/main/java/org/json/gson/example/DataObject.java

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+package org.json.gson.example;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+@SuppressWarnings("serial")
+public class DataObject implements Serializable{
+
+	private int data1 = 100;
+	private String data2 = "hello";
+	
+	private List<String> list = new ArrayList<String>() {
+		{
+			add("String 1");
+			add("String 2");
+			add("String 3");
+		}
+	};
+
+	@Override
+	public String toString() {
+		return "DataObject [data1=" + data1 + ", data2=" + data2 + ", list="
+				+ list + "]";
+	}
+
+	public int getData1() {
+		return data1;
+	}
+
+	public void setData1(int data1) {
+		this.data1 = data1;
+	}
+
+	public String getData2() {
+		return data2;
+	}
+
+	public void setData2(String data2) {
+		this.data2 = data2;
+	}
+
+	public List<String> getList() {
+		return list;
+	}
+
+	public void setList(List<String> list) {
+		this.list = list;
+	}
+
+}

json-tutorials/json-gson-example/src/main/java/org/json/gson/example/Gson2Json.java

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+package org.json.gson.example;
+
+import java.io.FileWriter;
+import java.io.IOException;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+public class Gson2Json {
+
+	public static void main(String[] args) {
+		
+		DataObject obj = new DataObject();
+		Gson gson = new GsonBuilder().setPrettyPrinting().create();
+	 
+		// convert java object to JSON format,
+		// and returned as JSON formatted string
+		String json = gson.toJson(obj);
+	 
+		try {
+			//write converted json data to a file named "file.json"
+			FileWriter writer = new FileWriter("src/main/resources/file.json");
+			writer.write(json);
+			writer.close();
+	 
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	 
+		System.out.println(json);
+		
+	}
+
+}

json-tutorials/json-gson-example/src/main/java/org/json/gson/example/GsonFromJson.java

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+package org.json.gson.example;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+public class GsonFromJson {
+
+	public static void main(String[] args) {
+		Gson gson = new GsonBuilder().setPrettyPrinting().create();
+		try {
+			BufferedReader br = new BufferedReader(new FileReader("src/main/resources/file.json"));
+			// convert the json string back to object
+			DataObject obj = gson.fromJson(br, DataObject.class);
+			System.out.println(obj);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+}

json-tutorials/json-gson-example/src/main/java/org/json/gson/example/GsonStreamReaderExample.java

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+package org.json.gson.example;
+
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+
+import com.google.gson.stream.JsonReader;
+
+public class GsonStreamReaderExample {
+
+	public static void main(String[] args) {
+
+		try {
+			JsonReader reader = new JsonReader(new FileReader("src/main/resources/user.json"));
+
+			reader.beginObject();
+
+			while (reader.hasNext()) {
+
+				String name = reader.nextName();
+
+				if (name.equals("name")) {
+
+					System.out.println(reader.nextString());
+
+				} else if (name.equals("age")) {
+
+					System.out.println(reader.nextInt());
+
+				} else if (name.equals("messages")) {
+
+					// read array
+					reader.beginArray();
+
+					while (reader.hasNext()) {
+						System.out.println(reader.nextString());
+					}
+
+					reader.endArray();
+
+				} else {
+					reader.skipValue(); // avoid some unhandle events
+				}
+			}
+
+			reader.endObject();
+			reader.close();
+
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+}

json-tutorials/json-gson-example/src/main/java/org/json/gson/example/GsonStreamWriterExample.java

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+package org.json.gson.example;
+
+import java.io.FileWriter;
+import java.io.IOException;
+
+import com.google.gson.stream.JsonWriter;
+
+public class GsonStreamWriterExample {
+
+	public static void main(String[] args) {
+
+		JsonWriter writer;
+		try {
+			writer = new JsonWriter(new FileWriter("src/main/resources/user.json"));
+
+			writer.beginObject(); // {
+			writer.name("name").value("mkyong"); // "name" : "mkyong"
+			writer.name("age").value(29); // "age" : 29
+
+			writer.name("messages"); // "messages" :
+			writer.beginArray(); // [
+			writer.value("msg 1"); // "msg 1"
+			writer.value("msg 2"); // "msg 2"
+			writer.value("msg 3"); // "msg 3"
+			writer.endArray(); // ]
+
+			writer.endObject(); // }
+			
+			writer.close();
+
+			System.out.println("Done");
+
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+	}
+}

json-tutorials/json-gson-example/src/main/resources/file.json

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+{
+  "data1": 100,
+  "data2": "hello",
+  "list": [
+    "String 1",
+    "String 2",
+    "String 3"
+  ]
+}

json-tutorials/json-gson-example/src/main/resources/user.json

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+{"name":"mkyong","age":29,"messages":["msg 1","msg 2","msg 3"]}