Fastjson使用

fastjson主要的使 用入口

Fastjson API入口类是com.alibaba.fastjson.JSON，常用的序列化操作都可以在JSON类上的静态方法直接完成。

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

3、有关类库的一些说明

SerializeWriter：相当于StringBuffer

JSONArray：相当于List

JSONObject：相当于Map

JSON反序列化没有真正数组，本质类型都是List

4、fastjson还有很多很高级的特性

比如支持注解、支持全类型序列化，这些都是很好的特性，功能强大，不在本次测试范围。

5、测试代码

  1. package lavasoft.stu.json; 
  3. import com.alibaba.fastjson.JSON; 
  4. import com.alibaba.fastjson.serializer.SerializeConfig; 
  5. import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer; 
  7. import java.util.*; 
  9. /** 
  10. * Created by IntelliJ IDEA. 
  11. * 
  12. * @author leizhimin 11-11-22 上午9:15 
  13. */ 
  14. public class Foo { 
  15.     private String vString = "vStringhehhehe"; 
  16.     private char vchar = 'x'; 
  18.     private byte vbyte = 64; 
  19.     private short vshort = 128; 
  20.     private int vint = 65535; 
  21.     private long vlong = 9999999L; 
  23.     private float vfloat = 12.1f; 
  24.     private double vdouble = 22.203d; 
  26.     private boolean vboolean = false; 
  28. //    private Date vdate = new Date(); 
  29.     private Date dddd = new Date(); 
  30.     private Date vDate = new Date(); 
  31.     private Date v_Date = new Date(); 
  32.     private Object vnull = null; 
  34.     private String[] avString = {"aaa", "bbb", "ccc"}; 
  35.     private int[] avint = {1, 2, 3, 4}; 
  36.     private boolean[] avboolean = {true, false, true, true}; 
  38.     private List<String> listString = new ArrayList<String>(); 
  39.     private Map<String, String> map = new HashMap<String, String>(); 
  41.     private Bar bar = new Bar(); 
  42.     private Bar[] avBar = {new Bar(), new Bar()}; 
  43.     private List<Bar> listBar = new ArrayList<Bar>(); 
  45.     { 
  46.         listString.add("listString1"); 
  47.         listString.add("listString2"); 
  48.         listString.add("listString3"); 
  50.         map.put("x", "s11111x"); 
  51.         map.put("y", "s22222y"); 
  52.         map.put("z", "s33333z"); 
  54.         listBar.add(new Bar()); 
  55.         listBar.add(new Bar()); 
  56.         listBar.add(new Bar()); 
  57.     } 
  61.     public String getvString() { 
  62.         return vString; 
  63.     } 
  65.     public void setvString(String vString) { 
  66.         this.vString = vString; 
  67.     } 
  69.     public char getVchar() { 
  70.         return vchar; 
  71.     } 
  73.     public void setVchar(char vchar) { 
  74.         this.vchar = vchar; 
  75.     } 
  77.     public byte getVbyte() { 
  78.         return vbyte; 
  79.     } 
  81.     public void setVbyte(byte vbyte) { 
  82.         this.vbyte = vbyte; 
  83.     } 
  85.     public short getVshort() { 
  86.         return vshort; 
  87.     } 
  89.     public void setVshort(short vshort) { 
  90.         this.vshort = vshort; 
  91.     } 
  93.     public int getVint() { 
  94.         return vint; 
  95.     } 
  97.     public void setVint(int vint) { 
  98.         this.vint = vint; 
  99.     } 
  101.     public long getVlong() { 
  102.         return vlong; 
  103.     } 
  105.     public void setVlong(long vlong) { 
  106.         this.vlong = vlong; 
  107.     } 
  109.     public float getVfloat() { 
  110.         return vfloat; 
  111.     } 
  113.     public void setVfloat(float vfloat) { 
  114.         this.vfloat = vfloat; 
  115.     } 
  117.     public double getVdouble() { 
  118.         return vdouble; 
  119.     } 
  121.     public void setVdouble(double vdouble) { 
  122.         this.vdouble = vdouble; 
  123.     } 
  125.     public boolean isVboolean() { 
  126.         return vboolean; 
  127.     } 
  129.     public void setVboolean(boolean vboolean) { 
  130.         this.vboolean = vboolean; 
  131.     } 
  133.     public Date getDddd() { 
  134.         return dddd; 
  135.     } 
  137.     public void setDddd(Date dddd) { 
  138.         this.dddd = dddd; 
  139.     } 
  141.     public Date getV_Date() { 
  142.         return v_Date; 
  143.     } 
  145.     public void setV_Date(Date v_Date) { 
  146.         this.v_Date = v_Date; 
  147.     } 
  149.     public Date getvDate() { 
  150.         return vDate; 
  151.     } 
  153.     public void setvDate(Date vDate) { 
  154.         this.vDate = vDate; 
  155.     } 
  157.     public Object getVnull() { 
  158.         return vnull; 
  159.     } 
  161.     public void setVnull(Object vnull) { 
  162.         this.vnull = vnull; 
  163.     } 
  165.     public String[] getAvString() { 
  166.         return avString; 
  167.     } 
  169.     public void setAvString(String[] avString) { 
  170.         this.avString = avString; 
  171.     } 
  173.     public int[] getAvint() { 
  174.         return avint; 
  175.     } 
  177.     public void setAvint(int[] avint) { 
  178.         this.avint = avint; 
  179.     } 
  181.     public boolean[] getAvboolean() { 
  182.         return avboolean; 
  183.     } 
  185.     public void setAvboolean(boolean[] avboolean) { 
  186.         this.avboolean = avboolean; 
  187.     } 
  189.     public List<String> getListString() { 
  190.         return listString; 
  191.     } 
  193.     public void setListString(List<String> listString) { 
  194.         this.listString = listString; 
  195.     } 
  197.     public Map<String, String> getMap() { 
  198.         return map; 
  199.     } 
  201.     public void setMap(Map<String, String> map) { 
  202.         this.map = map; 
  203.     } 
  205.     public Bar getBar() { 
  206.         return bar; 
  207.     } 
  209.     public void setBar(Bar bar) { 
  210.         this.bar = bar; 
  211.     } 
  213.     public Bar[] getAvBar() { 
  214.         return avBar; 
  215.     } 
  217.     public void setAvBar(Bar[] avBar) { 
  218.         this.avBar = avBar; 
  219.     } 
  221.     public List<Bar> getListBar() { 
  222.         return listBar; 
  223.     } 
  225.     public void setListBar(List<Bar> listBar) { 
  226.         this.listBar = listBar; 
  227.     } 
  228. }
package lavasoft.stu.json; 

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; 

/** 
* Created by IntelliJ IDEA. 
* 
* @author leizhimin 11-11-22 上午9:15 
*/ 
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(); 
    } 

    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 + 
                '}'; 
    } 
}

package lavasoft.stu.json; 

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.*; 

/** 
* Created by 2IntelliJ IDEA. 
* 
* @author leizhimin 11-11-22 上午9:45 
*/ 
public class Test { 
    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) { 
        Foo f1 = new Foo(); 
        Date date = new Date(); 
        String text = JSON.toJSONString(date, mapping); 
        System.out.println(text); 
        System.out.println(JSON.toJSONString(f1, true)); 
        String x2 =JSON.toJSONString(f1, mapping); 
        System.out.println(x2); 
    } 

    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()); 
        } 
    } 
}

说明：

SerializeConfig：是对序列化过程中一些序列化过程的特殊配置，这里用作日期格式的定义。

有关需要带类型的全类型序列化过程，需要调用JSON.toJSONStringZ()方法。

需要美化输出时候，需要打开序列化美化开关，在方法中true那个参数。

输出结果：

"2011-11-23 23:30:33" 
{ 
  "avBar":[{ 
    "barAge":174398800, 
    "barDate":1322062233062, 
    "barName":"sss_0.62378174" 
  },{ 
    "barAge":38938962, 
    "barDate":1322062233062, 
    "barName":"sss_0.36014742" 
  }], 
  "avString":["aaa","bbb","ccc"], 
  "avboolean":[true,false,true,true], 
  "avint":[1,2,3,4], 
  "bar":{ 
    "barAge":1601495948, 
    "barDate":1322062233062, 
    "barName":"sss_0.46644872" 
  }, 
  "dddd":1322062233046, 
  "listBar":[ 
    { 
      "barAge":-1090113522, 
      "barDate":1322062233062, 
      "barName":"sss_0.83562374" 
    }, 
    { 
      "barAge":478603194, 
      "barDate":1322062233062, 
      "barName":"sss_0.59483266" 
    }, 
    { 
      "barAge":1118357669, 
      "barDate":1322062233062, 
      "barName":"sss_0.9961642" 
    } 
  ], 
  "listString":[ 
    "listString1", 
    "listString2", 
    "listString3" 
  ], 
  "map":{"x":"s11111x","y":"s22222y","z":"s33333z"}, 
  "v_Date":1322062233046, 
  "vboolean":false, 
  "vbyte":64, 
  "vchar":"x", 
  "vdouble":22.203, 
  "vfloat":12.1, 
  "vint":65535, 
  "vlong":9999999, 
  "vshort":128 
} 
{"avBar":[{"barAge":174398800,"barDate":"2011-11-23 23:30:33","barName":"sss_0.62378174"},{"barAge":38938962,"barDate":"2011-11-23 23:30:33","barName":"sss_0.36014742"}],"avString":["aaa","bbb","ccc"],"avboolean":[true,false,true,true],"avint":[1,2,3,4],"bar":{"barAge":1601495948,"barDate":"2011-11-23 23:30:33","barName":"sss_0.46644872"},"dddd":"2011-11-23 23:30:33","listBar":[{"barAge":-1090113522,"barDate":"2011-11-23 23:30:33","barName":"sss_0.83562374"},{"barAge":478603194,"barDate":"2011-11-23 23:30:33","barName":"sss_0.59483266"},{"barAge":1118357669,"barDate":"2011-11-23 23:30:33","barName":"sss_0.9961642"}],"listString":["listString1","listString2","listString3"],"map":{"x":"s11111x","y":"s22222y","z":"s33333z"},"v_Date":"2011-11-23 23:30:33","vboolean":false,"vbyte":64,"vchar":"x","vdouble":22.203,"vfloat":12.1,"vint":65535,"vlong":9999999,"vshort":128} 

Process finished with exit code 0

测试小例子：

JSONObject json = new JSONObject();
json.put("aa", "11");
json.put("bb", "22");
json.put("cc", "33");
String jsonStr = json.toString();
System.out.println(jsonStr);
// {"aa":"11","bb":"22","cc":"33"}    

System.out.println(JSONObject.parseObject(jsonStr).get("aa"));
// 11

String o = "{'area':{'area':'1','pagetype':'home'},'pagetype':'home'}";
System.out.println(((Map) JSONObject.parseObject(o).get("area")).get("area"));
// 1
String text = JSON.toJSONString(o);
Map<String, Object> userMap = 
        JSON.parseObject(o, new TypeReference<Map<String, Object>>() {});
System.out.println(((Map) userMap.get("area")).get("NotExsit"));
// null

System.out.println(JSON.toJSONString((Map) userMap.get("area")));
// {"area":"1","pagetype":"home"}