JSON - 基础篇

package testJson;
import java.util.HashMap;
import java.util.Map;
import org.json.JSONObject;
import bean.DiaoSi;
public class CreateJson {
  public static void main(String[] args) {
    createJsonByPut();
    createJsonByMap();
    createJsonByBean();
  }
  // 使用put方法构建
  private static void createJsonByPut() {
    JSONObject wangxiaoer = new JSONObject();
    String nullObj = null;
    try {
      wangxiaoer.put("name", "王小二");
      wangxiaoer.put("age", 25.2);
      wangxiaoer.put("birthday", "1990-01-01");
      wangxiaoer.put("school", "蓝翔");
      wangxiaoer.put("major", new String[] {"理发", "挖掘机"});
      wangxiaoer.put("house", nullObj); // 这里不能直接写null
      System.out.println(wangxiaoer.toString());
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  // 使用map方式构建
  private static void createJsonByMap() {
    Map<String, Object> wangxiaoer = new HashMap<String, Object>();
    Object nullObj = null;
    wangxiaoer.put("name", "王小二");
    wangxiaoer.put("age", 25.2);
    wangxiaoer.put("birthday", "1990-01-01");
    wangxiaoer.put("school", "蓝翔");
    wangxiaoer.put("major", new String[] {"理发", "挖掘机"});
    wangxiaoer.put("house", nullObj);
    System.out.println(new JSONObject(wangxiaoer).toString());
  }
  // 使用Java Bean
  private static void createJsonByBean() {
    DiaoSi wangxiaoer = new DiaoSi();
    wangxiaoer.setName("王小二");
    wangxiaoer.setAge(25.2);
    wangxiaoer.setBirthday("1990-01-01");
    wangxiaoer.setSchool("蓝翔");
    wangxiaoer.setMajor(new String[] {"理发", "挖掘机"});
    wangxiaoer.setHouse(null);
    System.out.println(new JSONObject(wangxiaoer).toString());
  }
}

// 第三种方式中使用到的java bean代码如下
package bean;
public class DiaoSi {
  private String name;
  private String school;
  private double age;
  private Object house;
  private String[] major;
  private String birthday;
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getSchool() {
    return school;
  }
  public void setSchool(String school) {
    this.school = school;
  }
  public double getAge() {
    return age;
  }
  public void setAge(double age) {
    this.age = age;
  }
  public Object getHouse() {
    return house;
  }
  public void setHouse(Object house) {
    this.house = house;
  }
  public String[] getMajor() {
    return major;
  }
  public void setMajor(String[] major) {
    this.major = major;
  }
  public String getBirthday() {
    return birthday;
  }
  public void setBirthday(String birthday) {
    this.birthday = birthday;
  }
}

// 三种方式所输出的结果：
{"birthday":"1990-01-01","school":"蓝翔","age":25.2,"name":"王小二","major":["理发","挖掘机"]}
{"birthday":"1990-01-01","school":"蓝翔","age":25.2,"name":"王小二","house":null,"major":["理发","挖掘机"]}
{"birthday":"1990-01-01","school":"蓝翔","age":25.2,"name":"王小二","house":null,"major":["理发","挖掘机"]}