FastJson 介绍

Fast json 介绍

Fastjson是一个 Java 语言编写的JSON 处理器 , 由 阿里巴巴 公司开发。
1、遵循 http://json.org 标准，为其官方 网站收录 的参考实现之一。
2、功能 qiang 打，支持 JDK 的各种类型，包括基本的 JavaBean 、 Collection 、 Map 、 Date 、 Enum 、泛型。
3、无依赖，不需要例外额外的 jar ，能够直接跑在 JDK 上。
4、 开源 ，使用Apache License 2.0 协议开源。 http://code.alibabatech. com /wiki/display/FastJSON/Home
5、具有超高的 性能 ，java 世界里没有其他的 json 库能够和 fastjson 可相比了。

Fastjson的最主要的使用入口是 com.alibaba.fastjson.JSON

import com.alibaba.fastjson.JSON;

public static final Object parse(String text); // 把 JSON 文本 parse 为 JSONObject 或者 JSONArray
public static final JSONObject parseObject(String text)；  //  把 JSON 文本 parse 成 JSONObject
public static final <T> T parseObject(String text, Class<T> clazz); // 把 JSON 文本 parse 为 JavaBean
public static final JSONArray parseArray(String text); // 把 JSON 文本 parse 成 JSONArray
public static final <T> List<T> parseArray(String text, Class<T> clazz); //把 JSON 文本 parse 成 JavaBean 集合
public static final String toJSONString(Object object); // 将 JavaBean 序列化为 JSON 文本
public static final String toJSONString(Object object, boolean prettyFormat); // 将 JavaBean 序列化为带格式的 JSON 文本
public static final Object toJSON(Object javaObject); 将 JavaBean 转换为 JSONObject 或者 JSONArray 。

代码示例用到类Foo 和 Bar ：

 

import java.util.*;

public class Foo {
    private String vString = "vStringhehhehe";
    private char vchar = 'x';

    private byte vbyte = 64;
    private short vshort = 128;
    private int vint = 65535;
    private long vlong = 9999999L;

    private float vfloat = 12.1f;
    private double vdouble = 22.203d;

    private boolean vboolean = false;

    // private Date vdate = new Date();
    private Date dddd = new Date();
    private Date vDate = new Date();
    private Date v_Date = new Date();
    private Object vnull = null;

    private String[] avString = { "aaa", "bbb", "ccc" };
    private int[] avint = { 1, 2, 3, 4 };
    private boolean[] avboolean = { true, false, true, true };

    private List<String> listString = new ArrayList<String>();
    private Map<String, String> map = new HashMap<String, String>();

    private Bar bar = new Bar();
    private Bar[] avBar = { new Bar(), new Bar() };
    private List<Bar> listBar = new ArrayList<Bar>();

    {
        listString.add("listString1");
        listString.add("listString2");
        listString.add("listString3");

        map.put("x", "s11111x");
        map.put("y", "s22222y");
        map.put("z", "s33333z");

        listBar.add(new Bar());
        listBar.add(new Bar());
        listBar.add(new Bar());
    }

    public String getvString() {
        return vString;
    }

    public void setvString(String vString) {
        this.vString = vString;
    }

    public char getVchar() {
        return vchar;
    }

    public void setVchar(char vchar) {
        this.vchar = vchar;
    }

    public byte getVbyte() {
        return vbyte;
    }

    public void setVbyte(byte vbyte) {
        this.vbyte = vbyte;
    }

    public short getVshort() {
        return vshort;
    }

    public void setVshort(short vshort) {
        this.vshort = vshort;
    }

    public int getVint() {
        return vint;
    }

    public void setVint(int vint) {
        this.vint = vint;
    }

    public long getVlong() {
        return vlong;
    }

    public void setVlong(long vlong) {
        this.vlong = vlong;
    }

    public float getVfloat() {
        return vfloat;
    }

    public void setVfloat(float vfloat) {
        this.vfloat = vfloat;
    }

    public double getVdouble() {
        return vdouble;
    }

    public void setVdouble(double vdouble) {
        this.vdouble = vdouble;
    }

    public boolean isVboolean() {
        return vboolean;
    }

    public void setVboolean(boolean vboolean) {
        this.vboolean = vboolean;
    }

    public Date getDddd() {
        return dddd;
    }

    public void setDddd(Date dddd) {
        this.dddd = dddd;
    }

    public Date getV_Date() {
        return v_Date;
    }

    public void setV_Date(Date v_Date) {
        this.v_Date = v_Date;
    }

    public Date getvDate() {
        return vDate;
    }

    public void setvDate(Date vDate) {
        this.vDate = vDate;
    }

    public Object getVnull() {
        return vnull;
    }

    public void setVnull(Object vnull) {
        this.vnull = vnull;
    }

    public String[] getAvString() {
        return avString;
    }

    public void setAvString(String[] avString) {
        this.avString = avString;
    }

    public int[] getAvint() {
        return avint;
    }

    public void setAvint(int[] avint) {
        this.avint = avint;
    }

    public boolean[] getAvboolean() {
        return avboolean;
    }

    public void setAvboolean(boolean[] avboolean) {
        this.avboolean = avboolean;
    }

    public List<String> getListString() {
        return listString;
    }

    public void setListString(List<String> listString) {
        this.listString = listString;
    }

    public Map<String, String> getMap() {
        return map;
    }

    public void setMap(Map<String, String> map) {
        this.map = map;
    }

    public Bar getBar() {
        return bar;
    }

    public void setBar(Bar bar) {
        this.bar = bar;
    }

    public Bar[] getAvBar() {
        return avBar;
    }

    public void setAvBar(Bar[] avBar) {
        this.avBar = avBar;
    }

    public List<Bar> getListBar() {
        return listBar;
    }

    public void setListBar(List<Bar> listBar) {
        this.listBar = listBar;
    }
}

 

import com.alibaba.fastjson.JSON; 
import com.alibaba.fastjson.serializer.SerializeConfig; 
import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer; 

import java.util.Date; 
import java.util.Random; 

public class Bar { 
        public static SerializeConfig mapping = new SerializeConfig(); 
        private String barName; 
        private int barAge; 
        private Date barDate = new Date(); 
        static { 
                mapping.put(Date.class, new SimpleDateFormatSerializer("yyyy-MM-dd")); 
        } 
        { 
                Random r = new Random(); 
                barName = "sss_"+String.valueOf(r.nextFloat()); 
                barAge = r.nextInt(10); 
        } 

        public static void main(String[] args) { 
                Object obj = JSON.toJSON(new Bar()); 
                String x1 = JSON.toJSONString(new Bar(), true); 
                System.out.println(x1); 
                String x2 = JSON.toJSONString(new Bar(), mapping); 
                System.out.println(x2); 
        } 

        public String getBarName() { 
                return barName; 
        } 

        public void setBarName(String barName) { 
                this.barName = barName; 
        } 

        public int getBarAge() { 
                return barAge; 
        } 

        public void setBarAge(int barAge) { 
                this.barAge = barAge; 
        } 

        public Date getBarDate() { 
                return barDate; 
        } 

        public void setBarDate(Date barDate) { 
                this.barDate = barDate; 
        } 

        @Override 
        public String toString() { 
                return "Bar{" + 
                                "barName='" + barName + '\'' + 
                                ", barAge=" + barAge + 
                                ", barDate=" + barDate + 
                                '}'; 
        } 
}

import com.alibaba.fastjson.JSON; 
import com.alibaba.fastjson.JSONArray; 
import com.alibaba.fastjson.serializer.SerializeConfig; 
import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer; 

import java.util.*; 

public class Main { 
        private static SerializeConfig mapping = new SerializeConfig(); static { 
                mapping.put(Date.class, new SimpleDateFormatSerializer("yyyy-MM-dd HH:mm:ss")); 
        } 

        public static void main(String[] args) { 
            Test.json2Bean();                            
//            Test.json2List();
//            Test.json2Map();
//            Test.array2JSON();
//            Test.array2JSON2();
//            Test.map2JSON();
        } 

        public static void json2Bean(){ 
                //Bean->JSON
            Bar bar1 = new Bar();
            String str = JSON.toJSONString(bar,true);
            System.out.println(str);
            Bar bar2 = new Bar();
            bar2 = JSON.parseObject(str,Bar.class);
            System.out.println(bar2);

        }

        public static void json2List(){ 
                //List -> JSON array 
                List<Bar> barList = new ArrayList<Bar>(); 
                barList.add(new Bar()); 
                barList.add(new Bar()); 
                barList.add(new Bar()); 
                String json= JSON.toJSONString(barList, true); 
                System.out.println(json); 
                //JSON array -> List 
                List<Bar> barList1 = JSON.parseArray(json,Bar.class); 
                for (Bar bar : barList1) { 
                        System.out.println(bar.toString()); 
                } 
        } 

        public static void json2Map(){ 
                //Map -> JSON 
                Map<String,Bar> map = new HashMap<String, Bar>(); 
                map.put("a",new Bar()); 
                map.put("b",new Bar()); 
                map.put("c",new Bar()); 
                String json = JSON.toJSONString(map,true); 
                System.out.println(json); 
                //JSON -> Map 
                Map<String,Bar> map1 = (Map<String,Bar>)JSON.parse(json); 
                for (String key : map1.keySet()) { 
                        System.out.println(key+":"+map1.get(key)); 
                } 
        } 

        public static void array2JSON(){ 
                String[] arr_String    = {"a","b","c"}; 
                String json_arr_String = JSON.toJSONString(arr_String,true); 
                System.out.println(json_arr_String); 
                JSONArray jsonArray = JSON.parseArray(json_arr_String); 
                for (Object o : jsonArray) { 
                        System.out.println(o); 
                } 
                System.out.println(jsonArray); 
        } 
        public static void array2JSON2(){ 
                Bar[] arr_Bar    = {new Bar(),new Bar(),new Bar()}; 
                String json_arr_Bar = JSON.toJSONString(arr_Bar,true); 
                System.out.println(json_arr_Bar); 
                JSONArray jsonArray = JSON.parseArray(json_arr_Bar); 
                for (Object o : jsonArray) { 
                        System.out.println(o); 
                } 
                System.out.println(jsonArray); 
        } 

        public static void map2JSON(){ 
                Map map = new HashMap(); 
                map.put("a","aaa"); 
                map.put("b","bbb"); 
                map.put("c","ccc"); 
                String json=JSON.toJSONString(map); 
                System.out.println(json); 
                Map map1 = JSON.parseObject(json); 
                for (Object o : map.entrySet()) { 
                        Map.Entry<String,String> entry = (Map.Entry<String,String>)o; 
                        System.out.println(entry.getKey()+"--->"+entry.getValue()); 
                } 
        } 
}

 

 fastjson-1.1.39.jar：http://pan.baidu.com/s/1mg4tbAS

 fastjson-1.1.39-sources.jar：http://pan.baidu.com/s/1mg4YURA