Java JSON 之 字符串解析

http://www.verejava.com/?id=16998539745244

下载依赖 jar 包   

json.jar 


package com.json1;

import org.json.JSONException;
import org.json.JSONObject;

public class Test
{
    public static void main(String[] args)
    {
        /*
         题目: 将下面的JSON字符串 解析并打印出来 key=value
            {name:'李俊',age:25,marriage:true,money:1000.5}
         */
        
        try
        {
            String str="{name:'李俊',age:25,marriage:true,money:1000.5}";
            //放到 JSONObject 里面解析
            JSONObject jsonObj=new JSONObject(str);
            //通过 key 获得 对应的 value 值
            String name=jsonObj.getString("name");
            int age=jsonObj.getInt("age");
            boolean marriage=jsonObj.getBoolean("marriage");
            double money=jsonObj.getDouble("money");
            
            System.out.println(name+","+age+","+marriage+","+money);
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }
}





package com.json2;

import org.json.JSONException;
import org.json.JSONObject;

public class Test
{
    public static void main(String[] args)
    {
        /*
         题目: 将下面的JSON字符串 解析并打印出来
            {name:'李俊',age:25,address:{city:'北京',street:'回龙观',community:'新龙城',floor:10}}
         */
        
        
        try
        {
            String str="{name:'李俊',age:25,address:{city:'北京',street:'回龙观',community:'新龙城',floor:10}}";
            //最外面一层 是一个 JSONObject
            JSONObject jsonObj=new JSONObject(str);
            String name=jsonObj.getString("name");
            int age=jsonObj.getInt("age");
            
            //获得嵌套的 JSONObject
            JSONObject addressObj=jsonObj.getJSONObject("address");
            String city=addressObj.getString("city");
            String street=addressObj.getString("street");
            String community=addressObj.getString("community");
            int floor=addressObj.getInt("floor");
            
            System.out.println(name);
            System.out.println(age);
            System.out.println("地址:"+city+" "+street+" "+community+" "+floor);
            
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }
}






package com.json3;

import org.json.JSONArray;
import org.json.JSONException;

public class Test
{
    public static void main(String[] args)
    {
        /*
         题目: 将下面的JSON字符串 解析并打印出来
            ['篮球','乒乓球','足球','橄榄球','棒球','台球','高尔夫球']
         */
        
        try
        {
            String str="['篮球','乒乓球','足球','橄榄球','棒球','台球','高尔夫球']";
            //用 JSONArray 数组解析
            JSONArray jsonArray=new JSONArray(str);
            
            for(int i=0;i<jsonArray.length();i++)
            {
                String value=jsonArray.getString(i);
                System.out.println(value);
            }
            
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }
}





package com.json4;

import org.json.JSONArray;
import org.json.JSONException;

public class Test
{
    public static void main(String[] args)
    {
        /*
         题目: 将下面的JSON字符串 解析并打印出来
            [['乒乓球','台球','高尔夫球'],['足球','橄榄球','棒球']]
         */
        String str="[['乒乓球','台球','高尔夫球'],['足球','橄榄球','棒球']]";
        //解析 第一层
        try
        {
            JSONArray jsonArray=new JSONArray(str);
            for(int i=0;i<jsonArray.length();i++)
            {
                //['乒乓球','台球','高尔夫球']
                JSONArray childArray=jsonArray.getJSONArray(i);
                for(int j=0;j<childArray.length();j++)
                {
                    String value=childArray.getString(j);
                    System.out.print(value+" ");
                }
                //换一行
                System.out.println("");
            }
            
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }
}






package com.json5;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class Test
{
    public static void main(String[] args)
    {
        /*
         1.将下面的JSON字符串 解析并打印出来
                {name:'李俊',age:25,address:{description:'北京 回龙观 新龙城',floor:10},like:['唱歌','画画','旅游']}
         */
        String str="{name:'李俊',age:25,address:{description:'北京 回龙观 新龙城',floor:10},like:['唱歌','画画','旅游']}";
        //JSONObject 解析
        try
        {
            JSONObject jsonObj=new JSONObject(str);
            String name=jsonObj.getString("name");
            int age=jsonObj.getInt("age");
            System.out.println(name+","+age);
            
            //地址是  JSONObject
            JSONObject addressObj=jsonObj.getJSONObject("address");
            String description=addressObj.getString("description");
            int floor=addressObj.getInt("floor");
            System.out.println(description+","+floor);
            
            //爱好是 JSONArray
            JSONArray likeArray=jsonObj.getJSONArray("like");
            for(int i=0;i<likeArray.length();i++)
            {
                String value=likeArray.getString(i);
                System.out.println(value);
            }
            
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }
}






package com.json6;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class Test
{
    public static void main(String[] args)
    {
        /*
         2. 将下面的JSON字符串 解析并打印出来
                [{start:'北京',end:'上海',price:105},{start:'北京',end:'岳阳',price:175},{start:'北京',end:'广州',price:251}]
         */
        String str="[{start:'北京',end:'上海',price:105},{start:'北京',end:'岳阳',price:175},{start:'北京',end:'广州',price:251}]";
        //最外层 JSONArray
        try
        {
            JSONArray jsonArray=new JSONArray(str);
            for(int i=0;i<jsonArray.length();i++)
            {
                JSONObject jsonObj=jsonArray.getJSONObject(i);
                String start=jsonObj.getString("start");
                String end=jsonObj.getString("end");
                int price=jsonObj.getInt("price");
                
                System.out.println(start+","+end+","+price);
            }
            
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }
}

http://www.verejava.com/?id=16998539745244