Gson转换器 android
引入gson包 //Gson解析.封装服务器返回json结果 Gson gson = new Gson(); //1、对象转string Student stu = new Student(); stu.setStudentId(333); stu.setStudentName("qqq"); String stuStr = gson.toJson(stu); System.out.println(stuStr); //{"studentName":"qqq","studentId":333} // string转对象 Student user2 = gson.fromJson(stuStr, Student.class); System.out.println(user2); String stuTemp = "{\"studentName\":\"qqq2\",\"studentId\":3335}"; Student user4 = gson.fromJson(stuTemp, Student.class); System.out.println(user4); //2、对象List转string List<Student> testBeanList = new ArrayList<Student>(); Student testBean = new Student(); testBean.setStudentId(555); testBean.setStudentName("552"); testBeanList.add(testBean); //Gson gsonList = new Gson(); Type type = new TypeToken<List<Student>>(){}.getType(); //指定集合对象属性 String beanListToJson = gson.toJson(testBeanList, type); System.out.println(beanListToJson); //[{"studentName":"552","studentId":555}] //集合string转对象list List<Student> testBeanListFromJson = gson.fromJson(beanListToJson, type); System.out.println(testBeanListFromJson); //[555:552] //3、集合如果不指定类型 默认为String List<String> testList = new ArrayList<String>(); testList.add("first"); testList.add("second"); String listToJson = gson.toJson(testList); System.out.println(listToJson); //["first","second"] //集合字符串转回来需要指定类型 List<String> testList2 = (List<String>) gson.fromJson(listToJson, new TypeToken<List<String>>() { }.getType()); System.out.println(testList2); //4、 将HashMap字符串转换为 JSON Map<String, String> testMap = new HashMap<String, String>(); testMap.put("id", "id.first"); testMap.put("name", "name.second"); String mapToJson = gson.toJson(testMap); System.out.println(mapToJson); //{"id":"id.first","name":"name.second"} //HashMap转对象 Map<String, String> userMap2 = (Map<String, String>) gson.fromJson(mapToJson, new TypeToken<Map<String, String>>() { }.getType()); System.out.println(userMap2); //{id=id.first, name=name.second} //5、对象含有普通对象、集合、map情况 Student user1 = new Student(); user1.setStudentId(1001); user1.setStudentName("张三"); Student user3 = new Student(); user3.setStudentId(1002); user3.setStudentName("李四"); Map<String, Student> userMap = new HashMap<String, Student>(); userMap.put("user1", user1); userMap.put("user3", user3); List<Student> userList = new ArrayList<Student>(); userList.add(user1); userList.add(user3); Teacher groupBean = new Teacher(); groupBean.setStudent(user1); groupBean.setStus(userList); groupBean.setMap((HashMap)userMap); //groupBean.setUserList(userList); Gson gsonGroup = new Gson(); String sGroupBean = gsonGroup.toJson(groupBean, new TypeToken<Teacher>() { }.getType()); System.out.println(sGroupBean); /*{"stus":[{"studentName":"张三","studentId":1001},{"studentName":"李四","studentId":1002}],"student":{"studentName":"张三","studentId":1001},"map":{"user3":{"studentName":"李四","studentId":1002},"user1":{"studentName":"张三","studentId":1001}},"id":0,"age":0}*/ //复杂对象string转对象 Teacher groupBean2 = (Teacher) gson.fromJson(sGroupBean, new TypeToken<Teacher>() { }.getType()); System.out.println(groupBean2);
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