Gson笔记

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.3.1</version>
</dependency>

package edu.zju.chwl.gson;

import java.util.List;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

/**
 * 使用Goggle的gson库，将json解析成java bean
 * 
 * json:[{name:chwl, age:25, addressList:[{country:china, province:hubei},{country:china, province:zhejiang}]}, {name:chwl, age:25,addressList:[{country:china, province:hubei}, {country:china,province:zhejiang}]}] 
 * 转化为：List<Student> ， List<Address>为Student的成员变量
 * 
 * @author chwl
 * @Date 2016年1月7日 下午10:37:55
 */
public class GsonParse {
    public static void main(String[] args) {
        String jsonStr = "[{name:chwl, age:25, addressList:[{country:china, province:hubei}, {country:china, province:zhejiang}]}, {name:chwl, age:25, addressList:[{country:china, province:hubei}, {country:china, province:zhejiang}]}]";
         /** 
          * 配置Gson对象，可读源码
          * Gson gson = new GsonBuilder()
          *     .registerTypeAdapter(Id.class, new IdTypeAdapter())
          *     .enableComplexMapKeySerialization()
          *     .serializeNulls()
          *     .setDateFormat(DateFormat.LONG)
          *     .setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
          *     .setPrettyPrinting()
          *     .setVersion(1.0)
          *     .create();  
          */
        Gson gson = new GsonBuilder().create();
        //TypeToken用于声明复杂对象的类型，对于简单类型，使用public <T> T fromJson(String json, Class<T> classOfT)，比如第二个参数可为String.class
        List<Student> list=gson.fromJson(jsonStr,
                new TypeToken<List<Student>>() {}.getType());
        System.out.println(list);
    }

}

class Address {
    private String country;
    private String province;

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    @Override
    public String toString() {
        //打印json格式的字符串
        return "{country:" + country + ", province:" + province + "}";
    }

}

class Student {
    private String name;
    private int age;
    private List<Address> addressList;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public List<Address> getAddressList() {
        return addressList;
    }

    public void setAddressList(List<Address> addressList) {
        this.addressList = addressList;
    }

    @Override
    public String toString() {
        //打印json格式的字符串
        return "{name:" + name + ", age:" + age + ", addressList:"
                + addressList + "}";
    }

}

[{name:chwl, age:25, addressList:[{country:china, province:hubei}, {country:china, province:zhejiang}]}, {name:chwl, age:25, addressList:[{country:china, province:hubei}, {country:china, province:zhejiang}]}]