Gson---簡單入門

1-1.Diaosi.java(bean)

package Bean;

import com.google.gson.annotations.SerializedName;

public class Diaosi {
    @SerializedName("NAME")
    private String name;
    private String school;
    private boolean has_girlfriend;
    private double age;
    private Object car;
    private String[] major;
    private transient String ignore;

    public String getIgnore() {
        return ignore;
    }

    public void setIgnore(String ignore) {
        this.ignore = ignore;
    }

    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 boolean isHas_girlfriend() {
        return has_girlfriend;
    }

    public void setHas_girlfriend(boolean has_girlfriend) {
        this.has_girlfriend = has_girlfriend;
    }

    public double getAge() {
        return age;
    }

    public void setAge(double age) {
        this.age = age;
    }

    public Object getCar() {
        return car;
    }

    public void setCar(Object car) {
        this.car = car;
    }

    public String[] getMajor() {
        return major;
    }

    public void setMajor(String[] major) {
        this.major = major;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    private String comment;
    private String birthday;

//    public String toString(){
//        
//        return "[name:'"+name+"',school:'"+school+"',has_girlfriend:'"+has_girlfriend+"',age:'"+age+"',major:'"+major+"']";
//    }

}

1-2.

GsonGreateSample.java

package day05.gson;

import java.lang.reflect.Field;

import com.google.gson.FieldNamingStrategy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import Bean.Diaosi;

public class GsonGreateSample {
    public static void main(String[] args) {
        Diaosi wangxiaoer = new Diaosi();
        Object nullObject = null;
        wangxiaoer.setName("wangxiaoer");
        wangxiaoer.setAge(25.2);
        wangxiaoer.setBirthday("1990-01-01");
        wangxiaoer.setSchool("藍翔");
        wangxiaoer.setMajor(new String[] { "理髮", "挖掘機" });
        wangxiaoer.setHas_girlfriend(false);
        wangxiaoer.setCar(nullObject);
        wangxiaoer.setComment("這是一個註釋");
        // gson
        GsonBuilder gsonbuilder = new GsonBuilder();
        gsonbuilder.setPrettyPrinting();
        gsonbuilder.setFieldNamingStrategy(new FieldNamingStrategy() {

            @Override
            public String translateName(Field f) {
                if (f.getName().equals("school")) {
                    return "SCHOOL";
                }
                return f.getName();
            }
        });
        Gson gson = gsonbuilder.create();
        System.out.println(gson.toJson(wangxiaoer));
    }

}

結果：

-------------------------------------------------------

{

  "NAME": "wangxiaoer",

  "SCHOOL": "藍翔",

  "has_girlfriend": false,

  "age": 25.2,

  "major": [

    "理髮",

    "挖掘機"

  ],

  "comment": "這是一個註釋",

  "birthday": "1990-01-01"

}

-------------------------------------------------------

2-1.

Diaosinew.java(bean)

package Bean;

import java.util.List;

import com.google.gson.annotations.SerializedName;

public class Diaosinew {
    @SerializedName("NAME")
    private String name;
    private String school;
    private boolean has_girlfriend;
    private double age;
    private Object car;
    private List<String> major;
    public List<String> getMajor() {
        return major;
    }

    public void setMajor(List<String> major) {
        this.major = major;
    }

    private transient String ignore;

    public String getIgnore() {
        return ignore;
    }

    public void setIgnore(String ignore) {
        this.ignore = ignore;
    }

    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 boolean isHas_girlfriend() {
        return has_girlfriend;
    }

    public void setHas_girlfriend(boolean has_girlfriend) {
        this.has_girlfriend = has_girlfriend;
    }

    public double getAge() {
        return age;
    }

    public void setAge(double age) {
        this.age = age;
    }

    public Object getCar() {
        return car;
    }

    public void setCar(Object car) {
        this.car = car;
    }



    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    private String comment;
    private String birthday;


//    public String toString(){
//        
//        return "[name:'"+name+"',school:'"+school+"',has_girlfriend:'"+has_girlfriend+"',age:'"+age+"',major:'"+major+"']";
//    }

}

2-2.

ReadGSONSample.java

package day05;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

import com.google.gson.Gson;

import Bean.Diaosinew;

public class ReadGSONSample {
    public static void main(String[] args) throws IOException {
        File file = new File(ReadJSONSample.class.getResource("/wangxiaoer.json").getFile());
        String content = FileUtils.readFileToString(file);
        Gson gson=new Gson();
        Diaosinew wangxiaoer =(Diaosinew) gson.fromJson(content, Diaosinew.class);
        System.out.println(wangxiaoer.getMajor());
        System.out.println(wangxiaoer.getMajor().getClass());
    }
    
}

 結果：

[理髮, 挖掘機]

class java.util.ArrayList