JSON 及 jackson工具

程序员文章站 2022-05-28 22:30:36

...

JSON

JSON简介

概述:json是一种轻量级的数据交互格式、它是基于ECMAScript语法实现一个全新的语言。由于格式比较简单和清晰非常有利于人和阅读和编写、以及的解析和传输、所以说广泛的应用于数据交互。
校验json是否正常的地址.

JSON格式：

数组格式

[1, “pogne”, true]

对象格式

{
“uid”: 1,
“name”: “李小路”,
“sex”: “女”,
“hobby”: [“吃”, “喝”, “嫖”, “赌”]
}

对象数组

[{
“uid”: 1,
“name”: “李小路”,
“sex”: “女”,
“hobby”: [“吃”, “喝”, “嫖”, “赌”]
},
{
“uid”: 2,
“name”: “pgone”,
“sex”: “男”,
“hobby”: [“吃”, “喝”, “嫖”, “赌”]
},
{
“uid”: 3,
“name”: “马苏”,
“sex”: “女”,
“hobby”: [“嫖”]
}
]

复杂格式

{
“classId”: “IT001”,
“stus”: [{
“id”: 1,
“name”: “李小璐”,
“sex”: “女”,
“hobby”: [“吃”, “喝”, “嫖”, “赌”]
},
{
“id”: 2,
“name”: “pgone”,
“sex”: “男”,
“hobby”: [“吃”, “喝”, “嫖”, “赌”]
},
{
“id”: 1,
“name”: “马苏”,
“sex”: “女”,
“hobby”: [“嫖”]
}
]
}

json格式的语法规范：
　　1、用[]表示一个数组用{}表示一个对象
　　2、数组中可以写0-N个元素、每个元素用,隔开最后一个不加,每个元素的类型是object任意类型
　　3、对象中可以有0-N个属性、属性和属性值呈键值对形式、其中键必须是字符串、值可以是object任意类型,每个属性之间用,隔开最后一个属性不加 ,

JSON应用

解析口诀
　　遇见数组就遍历、遇见对象.属性

js解析json数组

@WebServlet("/array")
public class ArrayServlet extends HttpServlet {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//解决响应乱码
		resp.setContentType("text/html;charset=utf-8");
		//响应一个json数组
		resp.getWriter().print("[1, true, \"哈哈\"]");
	}

}

	<script type="text/javascript">
			
		$.ajax({
			url:"${pageContext.request.contextPath}/array",
			type:"get",
			dataType:"json",
			success:function(d){
				$.each(d,function(index,dd){
					console.log(index+"\t"+dd)
				})
			}
			
		})			
	</script>

js解析json对象

@WebServlet("/object")
public class ObjectServlet extends HttpServlet {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//解决响应乱码
		resp.setContentType("text/html;charset=utf-8");
		//响应一个json对象
		resp.getWriter().print("{\r\n" + 
				"	\"id\": 1,\r\n" + 
				"	\"name\": \"pgone\",\r\n" + 
				"	\"sex\": \"男\",\r\n" + 
				"	\"hobby\": [\"吃\", \"嫖\"]\r\n" + 
				"\r\n" + 
				"}");
	}

}

	<script type="text/javascript">
			
		$.get("${pageContext.request.contextPath }/object",{},function(d){
			console.log(d.id+"\t"+d.name+"\t"+d.sex+"\t")
			//遍历的爱好     hb:表示从爱好数组中获取的每一个爱好
			$.each(d.hobby,function(index,hb){
				console.log(hb)
			})
		},"json")
	
	</script>

js解析json 对象数组

@WebServlet("/obj")
public class ObjectArrayServlet extends HttpServlet {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//解决响应乱码
		resp.setContentType("text/html;charset=utf-8");
		//响应一个json对象
		resp.getWriter().print("[{\r\n" + 
				"		\"id\": 1,\r\n" + 
				"		\"name\": \"pgone\",\r\n" + 
				"		\"sex\": \"男\",\r\n" + 
				"		\"hobby\": [\"吃\", \"嫖\"]\r\n" + 
				"\r\n" + 
				"	},\r\n" + 
				"	{\r\n" + 
				"		\"id\": 2,\r\n" + 
				"		\"name\": \"李小璐\",\r\n" + 
				"		\"sex\": \"女\",\r\n" + 
				"		\"hobby\": [\"嫖\"]\r\n" + 
				"\r\n" + 
				"	},\r\n" + 
				"	{\r\n" + 
				"		\"id\": 3,\r\n" + 
				"		\"name\": \"马苏\",\r\n" + 
				"		\"sex\": \"女\",\r\n" + 
				"		\"hobby\": [\"嫖\"]\r\n" + 
				"\r\n" + 
				"	}\r\n" + 
				"]");
	}

}

	<script type="text/javascript">
			
		$.post("${pageContext.request.contextPath }/obj",{},function(d){
			
			$.each(d,function(index,student){
				console.log(student.id+"\t"+student.name+"\t"+student.sex+"\t")
				
				$.each(student.hobby,function(ind,hb){
					console.log(hb)
				})
				
			})
			
		},"json")
	</script>

js解析复杂格式

@WebServlet("/fz")
public class FzServlet extends HttpServlet {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//解决响应乱码
		resp.setContentType("text/html;charset=utf-8");
		//响应一个json对象
		resp.getWriter().print("{\r\n" + 
				"	\"ClassID\": \"IT001\",\r\n" + 
				"	\"stus\": [{\r\n" + 
				"			\"id\": 1,\r\n" + 
				"			\"name\": \"pgone\",\r\n" + 
				"			\"sex\": \"男\",\r\n" + 
				"			\"hobby\": [\"吃\", \"嫖\"]\r\n" + 
				"\r\n" + 
				"		},\r\n" + 
				"		{\r\n" + 
				"			\"id\": 2,\r\n" + 
				"			\"name\": \"李小璐\",\r\n" + 
				"			\"sex\": \"女\",\r\n" + 
				"			\"hobby\": [\"嫖\"]\r\n" + 
				"\r\n" + 
				"		},\r\n" + 
				"		{\r\n" + 
				"			\"id\": 3,\r\n" + 
				"			\"name\": \"马苏\",\r\n" + 
				"			\"sex\": \"女\",\r\n" + 
				"			\"hobby\": [\"嫖\"]\r\n" + 
				"\r\n" + 
				"		}\r\n" + 
				"	]\r\n" + 
				"\r\n" + 
				"}");
	}

}

	<script type="text/javascript">
		
		$.ajax({
			url:"${pageContext.request.contextPath }/fz",
			dataType:"json",
			type:"post",
			success:function(d){
				console.log(d.ClassID)
				$.each(d.stus,function(index,student){
					console.log(student.id+"\t"+student.name+"\t"+student.sex)
					$.each(student.hobby,function(ind,hb){
						console.log(hb)
					})
				})
			}
		})
	</script>

Jackson工具

使用步骤
　1、导入jackson包
JSON 及 jackson工具
　2、创建工具转换对象
　　　new ObjectMapper()
　3、调用转换方法
　　writeValueAsString(java对象)
代码示例

/*
	 * java数组转json数组
	 */
	@Test
	public void arrayToJson() throws JsonProcessingException {
		Object arr[] = {1,true,"哈哈"};
	    //创建工具转换对象
	    ObjectMapper mapper = new  ObjectMapper();
	    //调用转换方法
		String asString = mapper.writeValueAsString(arr);
		System.out.println(asString);
	}
	/*
	 * java对象 转json对象
	 */
	@Test
	public void objectToJson() throws JsonProcessingException {
		
		Student student = new Student(1,"马保国","男","五连鞭、健身、吹牛逼","大师","小伙子你不讲武德我告诉你",new Date());
	    //创建工具转换对象
	    ObjectMapper mapper = new  ObjectMapper();
	    //调用转换方法
		String asString = mapper.writeValueAsString(student);
		
		System.out.println(asString);
	}
	/*
	 * java集合 转json对象数组
	 */
	@Test
	public void objectArrayToJson() throws JsonProcessingException {
		Student stu1= new Student(1,"马保国","男","五连鞭、健身、吹牛逼","大师","小伙子你不讲武德我告诉你",new Date());
		Student stu2 = new Student(2,"切克哇啦","男","偷电瓶、进*","王者","打工、这辈子是不能打工的",new Date());
		
		ArrayList<Student> stu_list = new ArrayList<Student>();
		stu_list.add(stu1);
		stu_list.add(stu2);
		
		 //创建工具转换对象
	    ObjectMapper mapper = new  ObjectMapper();
	    //调用转换方法
		String asString = mapper.writeValueAsString(stu_list);
		System.out.println(asString);
	}
	/*
	 * java复杂格式转换为json对象
	 */
	@Test
	public void fzToJson() throws JsonProcessingException {
		ClassRoom room = new ClassRoom();
		room.setClassId("IT001");
		Student stu1= new Student(1,"马保国","男","五连鞭、健身、吹牛逼","大师","小伙子你不讲武德我告诉你",new Date());
		Student stu2 = new Student(2,"切克哇啦","男","偷电瓶、进*","王者","打工、这辈子是不能打工的",new Date());
		ArrayList<Student> stu_list = new ArrayList<Student>();
		stu_list.add(stu1);
		stu_list.add(stu2);
		room.setStus(stu_list);
		 //创建工具转换对象
	    ObjectMapper mapper = new  ObjectMapper();
	    //调用转换方法
		String asString = mapper.writeValueAsString(room);
		System.out.println(asString);
	}

相关标签： Java第二阶段笔记集 json js ajax

上一篇： ModuleNotFoundError: No module named 'urllib2'

下一篇： ImportError: No module named torch

JSON 及 jackson工具

目录

JSON

JSON简介

数组格式

对象格式

对象数组

复杂格式

JSON应用

js解析json数组

js解析json对象

js解析json 对象数组

js解析复杂格式

Jackson工具

php数组转换js数组操作及json_encode的用法详解

PHP json_encode() 函数详解及中文乱码问题

php语言中使用json的技巧及json的实现代码详解

快速卸载工具Uninstall Tool安装及破解方法图文教程

maya 7.0 artisan建模及工具简介

xml转json工具类（安卓json编辑器教程）

使用asp.net mvc,boostrap及knockout.js开发微信自定义菜单编辑工具(推荐)

Spring boot工具类静态属性注入及多环境配置详解

详解前端构建工具gulpjs的使用介绍及技巧

Telestream Wirecast Pro(直播剪辑工具)如何激活 Telestream Wirecast Pro安装及激活