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fastjson例子

 
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1.前言.
  如题
2.例子.
import com.alibaba.fastjson.JSON;


public class Person {
	int age;
	String name;
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public static void main(String[] args) {
		String jsonString="{\"name\":\"hah\",\"age\":1}";
		Person person = JSON.parseObject(jsonString, Person.class);
		System.out.println(1);
	}

}


3.参考.
上面为本人的例子,下面是摘录自博客园这位叫PointNet的博主的比较完整的文章:
http://www.cnblogs.com/goody9807/p/4244862.html
二. fastjson 解析json字符串为四种类型

      1. JavaBean

          Person person = JSON.parseObject(jsonString, Person.class);

      2. List<JavaBean>

          List<Person> listPerson =JSON.parseArray(jsonString, Person.class);

      3. List<String>

          List<String> listString = JSON.parseArray(jsonString, String.class);

      4. List<Map<String,Object>>

          List<Map<String, Object>> listMap = JSON.parseObject(jsonString, new TypeReference<List<Map<String,Object>>>(){});  (注意:此处可看出fastjson反射机制比gson更准确, id = 1001 通过fastjson反射仍是 id = 1001 , 而通过gson反射结果 为 id =1001.0 ,

 

JSON解析器fastjson(阿里巴巴出品,版本1.1.26),如果定义了JSONObject为{"JACKIE_ZHANG":"张学友","ANDY_LAU":"刘德华","LIMING":"黎明","Aaron_Kwok":"郭富城"},那么读取值时,KEY顺序无序,测试代码:

 

    import com.alibaba.fastjson.JSONObject;  
      
      
    /** 
     * Created by wangzhenfei on 14-4-15. 
     */  
    public class FastJsonTest {  
        public static void main(String[] args){  
            String jsonStr = "{\"JACKIE_ZHANG\":\"张学友\",\"ANDY_LAU\":\"刘德华\",\"LIMING\":\"黎明\",\"Aaron_Kwok\":\"郭富城\"}" ;  
      
      
            //做5次测试  
            for(int i=0,j=5;i<j;i++)  
            {  
               JSONObject jsonObject = JSONObject.parseObject(jsonStr) ;  
               for(java.util.Map.Entry<String,Object> entry:jsonObject.entrySet()){  
                   System.out.print(entry.getKey()+"-"+entry.getValue()+"\t");  
               }  
                System.out.println();//用来换行  
            }  
        }  
    }  


运行结果:

 

    LIMING-黎明 Aaron_Kwok-郭富城JACKIE_ZHANG-张学友ANDY_LAU-刘德华  
    Aaron_Kwok-郭富城 ANDY_LAU-刘德华LIMING-黎明JACKIE_ZHANG-张学友  
    Aaron_Kwok-郭富城 JACKIE_ZHANG-张学友ANDY_LAU-刘德华LIMING-黎明  
    LIMING-黎明 ANDY_LAU-刘德华JACKIE_ZHANG-张学友Aaron_Kwok-郭富城  
    JACKIE_ZHANG-张学友 LIMING-黎明ANDY_LAU-刘德华Aaron_Kwok-郭富城  

 

 

解决办法:定义为JSONArray,代码如下:

 

    import com.alibaba.fastjson.JSONArray;  
      
    /** 
     * Created by wangzhenfei on 14-4-15. 
     */  
    public class FastJsonTest {  
        public static void main(String[] args){  
            String jsonStr = "[{\"JACKIE_ZHANG\":\"张学友\"},{\"ANDY_LAU\":\"刘德华\"},{\"LIMING\":\"黎明\"},{\"Aaron_Kwok\":\"郭富城\"}]" ;  
            //做5次测试  
            for(int i=0,j=5;i<j;i++)  
            {  
                JSONArray jsonArray = JSONArray.parseArray(jsonStr);  
      
               for(int k=0;k<jsonArray.size();k++){  
                   System.out.print(jsonArray.get(k) + "\t");  
               }  
                System.out.println();//用来换行  
            }  
        }  
    }  


运行结果为:

 

    {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"}  
    {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"}  
    {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"}  
    {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"}  
    {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"}  

 

 

如果就想要定义为JSONObject,而不是JSONArray,可以选用其他JSON解析器,个人推荐使用google的gson,文档明显比fastjson好很多(从这里可以看出阿里巴巴和谷歌的差距):

 

    import com.google.gson.JsonElement;  
    import com.google.gson.JsonObject;  
    import com.google.gson.JsonParser;  
      
    /** 
     * Created by wangzhenfei on 14-4-15. 
     */  
    public class FastJsonTest {  
        public static void main(String[] args){  
            String jsonStr = "{\"JACKIE_ZHANG\":\"张学友\",\"ANDY_LAU\":\"刘德华\",\"LIMING\":\"黎明\",\"Aaron_Kwok\":\"郭富城\"}" ;  
            //做5次测试  
            for(int i=0,j=5;i<j;i++)  
            {  
                JsonObject jsonObject = (JsonObject) new JsonParser().parse(jsonStr);  
                for(java.util.Map.Entry<String,JsonElement> entry:jsonObject.entrySet()){  
                    System.out.print(entry.getKey()+"-"+entry.getValue()+"\t");  
                }  
                System.out.println();//用来换行  
            }  
        }  
    }  


运行结果:

 

 

        JACKIE_ZHANG-"张学友"  ANDY_LAU-"刘德华"  LIMING-"黎明" Aaron_Kwok-"郭富城"      
        JACKIE_ZHANG-"张学友"  ANDY_LAU-"刘德华"  LIMING-"黎明" Aaron_Kwok-"郭富城"      
        JACKIE_ZHANG-"张学友"  ANDY_LAU-"刘德华"  LIMING-"黎明" Aaron_Kwok-"郭富城"      
        JACKIE_ZHANG-"张学友"  ANDY_LAU-"刘德华"  LIMING-"黎明" Aaron_Kwok-"郭富城"      
        JACKIE_ZHANG-"张学友"  ANDY_LAU-"刘德华"  LIMING-"黎明" Aaron_Kwok-"郭富城"      


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