Gson用法总结

最近android开发频繁用到Gson库，传送接受json数据，以此总结一下

Student类(javabean类）

public class Student {
private int number;
private String name;
public Student(int number, String name) {
this.number = number;
this.name = name;
}
public int getNumber() { return number;}
public String getName() { return name; }
public void setNumber(int number) {this.number = number;}
public void setName(String name) {this.name = name;}
}

Teacher类(javabean类)

public class Teacher {
private String name;
private boolean sex;
public Teacher(String name, boolean sex) {
this.name = name;
this.sex = sex;
}
public String getName() {return name;}
public boolean getSex() {return sex;}
public void setName(String name) {this.name = name;}
public void setSex(boolean sex) {this.sex = sex;}
}


• javabean对象, json字符串互相转换
  
Student studnet = new Student();
student.setName("zhouyu");
student.setNumber(140);
/*对象转化为字符串*/
String jsonStudent = new Gson().toJson(student);
/*字符串转化为对象*/
Student student = new Gson().from(jsonStudent, Student.class);
/* jsonStudent: {"number":140,"name":"周宇"} */


• javabean对象数组转化为字符串
  
List<Student> studentList = new ArrayList<Student>();
Student studentOne = new Student(11, "周宇");
Student studentTwo = new Student( 12, "周坤");
Student studentThree= new Student(13, "周恒");
studentList.add(studentOne);
studentList.add(studentTwo);
studentList.add(studentThree);
/*对象数组转化为字符串*/
String jsonStudentList = new Gson().toJson(studentList);
System.out.println(jsonStudentList);
/*将字符串转化为对象数组*/
JsonParser parser = new JsonParser();
JsonArray jsonArray = parser.parse(jsonStudentList).getAsJsonArray();
Gson gson = new Gson();
for(JsonElement element : jsonArray) {
Student student = gson.fromJson(element, Student.class);
System.out.println(student.getName());
}
/*jsonStudentList:[{"number":11,"name":"周宇"},{"number":12,"name":"周坤"},{"number":13,"name":"周恒"}] */


• json字符串的拼接与解析
  
List<Student> studentList = new ArrayList<Student>();
List<Teacher> teacherList = new ArrayList<Teacher>();
Student studentOne = new Student(11, "周宇");
studentList.add(studentOne);
Student studentTwo = new Student( 12, "周坤");
studentList.add(studentTwo);
Student studentThree= new Student(13, "周恒");
studentList.add(studentThree);
Teacher teacherOne = new Teacher("张三", true); teacherList.add(teacherOne);
Teacher teacherTwo = new Teacher("李四", false); teacherList.add(teacherTwo);
Teacher teacherThree = new Teacher("王五",true);
teacherList.add(teacherThree);
String jsonStudentList = new Gson().toJson(studentList);
String jsonTeacherList = new Gson().toJson(teacherList);
JSONObject objectOne = new JSONObject();
objectOne.put("studentList", jsonStudentList);
objectOne.put("teacherList", jsonTeacherList);
String jsonComplex = objectOne.toString();
JSONObject objectTwo = new JSONObject(jsonComplex);
String jsonStudentList = objectTwo.getString("studentList");
String jsonTeacherList = objectTwo.getString("teacherList");