zoukankan      html  css  js  c++  java
  • google gson使用

    关键字: json gson java

    Gson网址http://code.google.com/p/google-gson/

    1.简单的处理list和map

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    Gson gson = new Gson();
    List testList = new ArrayList();
    testList.add("first");
    testList.add("second");
    String listToJson = gson.toJson(testList);
    System.out.println(listToJson);     
    //prints ["first","second"]
      
    Map testMap = new HashMap();
    testMap.put("id", "id.first");
    testMap.put("name","name.second");
    String mapToJson = gson.toJson(testMap);
    System.out.println(mapToJson);  
    //prints {"id":"id.first","name":"name.second"}

     2.处理带泛型的集合

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    List<TestBean> testBeanList = new ArrayList<TestBean>();
    TestBean testBean = new TestBean();
    testBean.setId("id");
    testBean.setName("name");
    testBeanList.add(testBean);
              
    java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<TestBean>>() {
    }.getType();
    String beanListToJson = gson.toJson(testBeanList,type);
    System.out.println(beanListToJson);
    //prints [{"id":"id","name":"name"}]
              
    List<TestBean> testBeanListFromJson = gson.fromJson(beanListToJson, type);
    System.out.println(testBeanListFromJson);
    //prints [TestBean@1ea5671[id=id,name=name,birthday=<null>]]

    map等其他集合类型同上

    3.Date类型转化

    先写工具类

    工具类
    1 1. import java.lang.reflect.Type;
    2 2.
    3 3. import com.google.gson.JsonDeserializationContext;
    4 4. import com.google.gson.JsonDeserializer;
    5 5. import com.google.gson.JsonElement;
    6 6. import com.google.gson.JsonParseException;
    7 7.
    8 8. publicclass UtilDateDeserializer implements JsonDeserializer<java.util.Date> {
    9 9.
    10 10. @Override
    11 11. public java.util.Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
    12 12. throws JsonParseException {
    13 13. returnnew java.util.Date(json.getAsJsonPrimitive().getAsLong());
    14 14. }
    15 15. }
    代码
    11. import java.lang.reflect.Type;
    22.
    33. import com.google.gson.JsonElement;
    44. import com.google.gson.JsonPrimitive;
    55. import com.google.gson.JsonSerializationContext;
    66. import com.google.gson.JsonSerializer;
    77.
    88. publicclass UtilDateSerializer implements JsonSerializer<java.util.Date> {
    99.
    1010. @Override
    1111. public JsonElement serialize(java.util.Date src, Type typeOfSrc,
    1212. JsonSerializationContext context) {
    1313. returnnew JsonPrimitive(src.getTime());
    1414. }
    1515.
    1616. }
    序列化
    11. /**
    2 2. * 序列化方法
    3 3. * @param bean
    4 4. * @param type
    5 5. * @return
    6 6. */
    77. publicstatic String bean2json(Object bean, Type type) {
    88. Gson gson =new GsonBuilder().registerTypeAdapter(java.util.Date.class, new UtilDateSerializer())
    99. .setDateFormat(DateFormat.LONG).create();
    1010. return gson.toJson(bean);
    1111. }
    1212.
    1313. /**
    14 14. * 反序列化方法
    15 15. * @param json
    16 16. * @param type
    17 17. * @return
    18 18. */
    1919. publicstatic<T> T json2bean(String json, Type type) {
    2020. Gson gson =new GsonBuilder().registerTypeAdapter(java.util.Date.class, new UtilDateDeserializer())
    2121. .setDateFormat(DateFormat.LONG).create();
    2222. return gson.fromJson(json, type);
    2323. }
    现在开始测试
    1# List<TestBean> testBeanList =new ArrayList<TestBean>();
    2# TestBean testBean =new TestBean();
    3# testBean.setId("id");
    4# testBean.setName("name");
    5# testBean.setBirthday(new java.util.Date());
    6# testBeanList.add(testBean);
    7#
    8# java.lang.reflect.Type type =new com.google.gson.reflect.TypeToken<List<TestBean>>() {
    9# }.getType();
    10# String beanListToJson = bean2json(testBeanList, type);
    11# System.out.println("beanListToJson:"+ beanListToJson);
    12# //prints [{"id":"id","name":"name","birthday":1256531559390}]
    13#
    14# List<TestBean> testBeanListFromJson = json2bean(beanListToJson, type);
    15# System.out.println(testBeanListFromJson);
    16# //prints [TestBean@77a7f9[id=id,name=name,birthday=Mon Oct 26 12:39:05 CST 2009]]
  • 相关阅读:
    Android(java)学习笔记68:使用proguard混淆android代码
    SGU 194 Reactor Cooling
    关于流量有上下界的网络流问题的求解
    关于最小割的求解方法
    HDU 5311 Hidden String
    POJ 3548 Restoring the digits
    POJ 2062 HDU 1528 ZOJ 2223 Card Game Cheater
    ZOJ 1967 POJ 2570 Fiber Network
    HDU 1969 Pie
    HDU 1956 POJ 1637 Sightseeing tour
  • 原文地址:https://www.cnblogs.com/yangy608/p/2734300.html
Copyright © 2011-2022 走看看