使用JackSon反序列化，封装数据

Json是一种高效的数据结构，在Android与服务器后台交互的过程中常常涉及到Json数据的封装，在这篇文章中将会分析如何讲json数据反序列化为对象，进行进一步的数据封装。

首先json的数据格式先做一个简单的介绍，如下格式

{
    "response": [
        {
            "name": "小周",
            "age": 20,
            "birthday": 844099200000,
            "email": "xiaomin@sina.com",
            "countryInfo": {
                "golden": 40,
                "silver": 23,
                "copper": 33,
                "tank": 1
            },
            "countryDetail": [
                {
                    "id": "no",
                    "header": "号码",
                    "printable": true
                },
                {
                    "id": "name",
                    "header": "姓名",
                    "printable": true
                },
                {
                    "id": "detail",
                    "header": "详细",
                    "printable": false
                }
            ]
        }
    ]
}

这是一个标准的从服务器传回的Json数据，我自己对于json的理解是“[]”中封装的是数组数据，"{}"中封装的是对象数据，而key-value的形式是属性和值的对应关系。也就是说再创建对应的JavaBean的时候见到"[]"应当将其用数组或者list,set等容器封装起来，而"{}"中的数据应当当成一个对象封装起来

  封装起来的效果如下代码：

public class UserJson {
	private List<User> response;

	public List<User> getResponse() {
		return response;
	}

	public void setResponse(List<User> response) {
		this.response = response;
	}

	 
	
}

<pre name="code" class="java">private String name;
	private Integer age;
	private Date birthday;
	private String email;
	private Country countryInfo;

	private List<CountryDetail> countryDetail;

	public List<CountryDetail> getCountryDetail() {
		return countryDetail;
	}

	public void setCountryDetail(List<CountryDetail> countryDetail) {
		this.countryDetail = countryDetail;
	}

	public Country getCountryInfo() {
		return countryInfo;
	}

	public void setCountryInfo(Country countryInfo) {
		this.countryInfo = countryInfo;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

<pre name="code" class="java">public class Country {
	private int golden;
	private int silver;
	private int copper;
	private int tank;
	public int getGolden() {
		return golden;
	}
	public void setGolden(int golden) {
		this.golden = golden;
	}
	public int getSilver() {
		return silver;
	}
	public void setSilver(int silver) {
		this.silver = silver;
	}
	public int getCopper() {
		return copper;
	}
	public void setCopper(int copper) {
		this.copper = copper;
	}
	public int getTank() {
		return tank;
	}
	public void setTank(int tank) {
		this.tank = tank;
	}
	
}

<pre name="code" class="java">public class CountryDetail {
	 private String id;
     private String header;
     private boolean printable;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getHeader() {
		return header;
	}
	public void setHeader(String header) {
		this.header = header;
	}
	public boolean isPrintable() {
		return printable;
	}
	public void setPrintable(boolean printable) {
		this.printable = printable;
	}
     

 
}

上面是有关javabean 的封装，接下来是利用Jsason的反序列化，处理数据

public class JsonParse2 {
	final static String json = "{ \"response\":[ {\"name\":\"小民\",\"age\":20,\"birthday\":844099200000,\"email\":\"xiaomin@sina.com\""
			+ ",\"countryInfo\":{\"golden\": 40,\"silver\": 23,\"copper\": 33,\"tank\": 1},\"countryDetail\":[{\"id\":\"no\","
			+ "\"header\":\"号码\",\"printable\":true},{\"id\":\"name\",\"header\":\"姓名\",\"printable\":true},{\"id\":\"detail\",\"header\":\"详细\",\"printable\":false}]  }]}";

	public static void main(String[] args) {
		ObjectMapper mapper = new ObjectMapper();

		User user=null;
		try {
			UserJson userJson = mapper.readValue(json,
					new TypeReference<UserJson>() {
					});
			user = userJson.getResponse().get(0);
//			System.out.println(userJson.getResponse().getCountryDetail().get(0)
//					.getHeader());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		 System.out.println(user.getCountryDetail().get(0).getHeader());
	}

}

需要注意的是TypeReference的使用，因为jackson把数据默认解析成了Map对象，我们需要用泛型指明其目标类型。这只是一个简单的例子，帮助大家理解，本人水平有限，若有纰漏之处，希望指正，转载请注明出处