FastJson学习笔记

1.测试实体类

/** * * @Description: 测试 * @date 2017年7月12日 下午6:04:09 * @version V1.0 */
public class Person {
    /** * 姓名 */
    private String name;
    /** * 年龄 */
    private Integer age;
    /** * 地址 */
    private String address;
    /** * 电话 */
    private String tellphone;


    public Person(){}
    /** * @param name * @param age */
    public Person(String name,Integer age) {
        super();
        this.name = name;
        this.age = age;
    }
    public Person(String name,Integer age,String address,String tellphone) {
        this.name = name;
        this.age = age;
        this.address = address;
        this.tellphone = tellphone;
    }

    /** * @return the name */
    public String getName() {
        return name;
    }

    /** * @param name * the name to set */
    public void setName(String name) {
        this.name = name;
    }

    /** * @return the age */
    public Integer getAge() {
        return age;
    }

    /** * @param age * the age to set */
    public void setAge(Integer age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getTellphone() {
        return tellphone;
    }

    public void setTellphone(String tellphone) {
        this.tellphone = tellphone;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ",age=" + age + "]";
    }
}

2.FastJson常用API

/** * com.alibaba.fastjson.JSON; * This is the main class for using Fastjson * You usually call these two methods toJSONString(Object) and parseObject(String,Class). */
public class FastJsonTest {


    /** * deserializes json into model */
    public void jsonToModel(){
        StringBuilder jsonBuilder = new StringBuilder(128);
        jsonBuilder.append("{\"name\":\"xiaoming\",\"age\":\"25\"}");
        Person person = JSON.parseObject(jsonBuilder.toString(),Person.class);
        System.out.println(person);
        // Person [name=xiaoming,age=25]
    }

    /** * the object that your are serializing/deserializing is a ParameterizedType * then you must use the parseObject(String,Type,Feature[]) method */
    public void jsonToList(){
        StringBuilder jsonBuilder = new StringBuilder(128);
        jsonBuilder.append("[");
        jsonBuilder.append("{\"name\":\"Tom\",\"age\":\"23\"},");
        jsonBuilder.append("{\"name\":\"Cat\",\"age\":\"21\"}");
        jsonBuilder.append("]");
        Type type = new TypeReference<List<Person>>() {}.getType();
        // This method deserializes the specified Json into an object of the specified type.
        // This method is useful if the specified object is a generic type(泛型)
        // For non-generic objects,use parseObject(String,Class,Feature[]) instead
        List<Person> list = JSON.parseObject(jsonBuilder.toString(),type);
        for(Person p : list){
            System.out.println(p);
        }
      // Person [name=Tom,age=23]
       // Person [name=Cat,age=21]
    }

    public void jsonToMap(){
        StringBuilder jsonBuilder = new StringBuilder(128);
        jsonBuilder.append("{\"name\":\"xiaoming\",\"age\":\"25\"}");
        Type type = new TypeReference<Map<String,Object>>() {}.getType();
        Map  map = JSON.parseObject(jsonBuilder.toString(),type);
        System.out.println(map);
        //{name=xiaoming,age=25}
    }

    /** * serializes model to Json */
    public void  modelToJson(){
        String json = JSON.toJSONString(new Person("tocmat",22));
        System.out.println(json);
        // {"age":22,"name":"tocmat"}
         //格式化
        System.out.println(JSON.toJSONString(new Person("测试",25),true));
        /** * { "age":25,"name":"测试" } */
    }

    /** * 集合转json字符串 */
    public void listToJson(){
        Person one = new Person("Tom",21);
        Person two = new Person("Cat",25);
        List<Person> list = new ArrayList<>();
        list.add(one);
        list.add(two);
        String json = JSON.toJSONString(list,true);
        System.out.println(json);
        /** [ { "age":21,"name":"Tom" },{ "age":25,"name":"Cat" } ] */
    }

    /** * 自定义反序列化 */
   public void customerJsonToObject(){
     // Feature.AllowSingleQuotes 允许单引号 默认已使用
       // Feature.AllowUnQuotedFieldNames 允许没有引号的key 默认已使用
       // ....
       StringBuilder jsonBuilder = new StringBuilder(128);
       jsonBuilder.append("{\"name\":\'xiaoming\',age:\"25\"}");
       Person person = JSON.parseObject(jsonBuilder.toString(),Person.class,Feature.AllowSingleQuotes);
       System.out.println(person);
       //Person [name=xiaoming,age=25]
   }

    /** * 自定义序列化 */
   public void customerObjectToJson(){
       // SerializerFeature.QuoteFieldNames 用引号包裹key 默认已使用
       // SerializerFeature.SortField 排序输出字段 默认已使用
      // SerializerFeature.PrettyFormat 格式化
      // SerializerFeature.UseSingleQuotes key和字符串值 使用单引号
       // .....

       String json = JSON.toJSONString(new Person("tomcat",22),SerializerFeature.PrettyFormat,SerializerFeature.UseSingleQuotes);
       System.out.println(json);
       /** { 'age':22,'name':'tomcat' } */
       //忽略的字段和包含字段
       SimplePropertyPreFilter filter = new SimplePropertyPreFilter();
       filter.getExcludes().add("name"); //忽略name字段
       filter.getExcludes().add("age"); // 忽略age字段
       Person person = new Person("张三",25,"某某地址","1534587787");
       String personjson = JSON.toJSONString(person,filter);
       System.out.println(personjson);
       // {"address":"某某地址","tellphone":"1534587787"}

       filter = new SimplePropertyPreFilter();
       filter.getIncludes().add("address"); //包含address字段
       filter.getIncludes().add("age");  //包含age字段
       System.out.println(JSON.toJSONString(person,filter));
       // {"address":"某某地址","age":25}
   }



    public static void main(String[] args){
        FastJsonTest  test = new FastJsonTest();
        test.customerObjectToJson();

    }



}