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": "[e-mail]",            "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\":\"[e-mail]\""+ ",\"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 blocke.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