<person> 
  <name>xiazdong</name> 
  <age>20</age> 
</person> 

{ 
  "name":"xiazdong", 
  "age":20 
} 

<section> 
  <title>BOOK</title> 
  <signing> 
    <author name="author-1"/> 
    <book title="book1" price="$11"/> 
  </signing> 
  <signing> 
    <author name="author-2"/> 
    <book title="book2" price="$22"/> 
  </signing> 
</section> 

"section":{ 
    "title":"BOOK", 
    "signing":[ 
    { 
  <span style="white-space:pre"> </span> "author": 
      { 
        "name":"author-1" 
      }, 
      "book": 
      { 
        "title":"book1", 
        "price":"$11" 
      } 
    }, 
    { 
      "author": 
      { 
        "name":"author-2" 
      }, 
      "book": 
      { 
        "title":"book2", 
        "price":"$22" 
      } 
    }   
<span style="white-space:pre"> </span> ]} 
  } 

package com.xiazdong.json; 
 
import weibo4j.org.json.JSONArray; 
import weibo4j.org.json.JSONObject; 
 
public class Test { 
 
  public static void main(String[] args) throws Exception{ 
    JSONObject jsonobj = new JSONObject("{'name':'xiazdong','age':20}"); 
    String name = jsonobj.getString("name"); 
    int age = jsonobj.getInt("age"); 
    System.out.println(name+":"+age);   
     
  } 
} 

JSONArray array = new JSONArray(String str); //将String转为JSONArray

int length = array.length(); //返回Array的长度；

package com.xiazdong.json; 
 
import weibo4j.org.json.JSONArray; 
import weibo4j.org.json.JSONObject; 
 
public class Test { 
 
  public static void main(String[] args) throws Exception{ 
       
    JSONArray jsonarray = new JSONArray("[{'name':'xiazdong','age':20},{'name':'xzdong','age':15}]"); 
    for(int i=0;i<jsonarray.length();i++){ 
      String name = jsonarray.getJSONObject(i).getString("name"); 
      int age = jsonarray.getJSONObject(i).getInt("age"); 
      System.out.println("name="+name); 
      System.out.println("age="+age); 
    } 
     
  } 
} 

package com.xiazdong.json; 
 
import weibo4j.org.json.JSONArray; 
import weibo4j.org.json.JSONObject; 
 
public class Test { 
 
  public static void main(String[] args) throws Exception{ 
 
    String str = "{'name':'xiazdong','age':20,'book':['book1','book2']"; 
    JSONObject obj = new JSONObject(str); 
    System.out.println(obj.getJSONArray("book").getString(0)); 
  } 
} 

package com.xiazdong.json; 
 
import weibo4j.org.json.JSONStringer; 
 
public class JsonStringerDemo { 
 
  public static void main(String[] args) throws Exception{ 
    JSONStringer stringer = new JSONStringer(); 
    String str = stringer.object().key("name").value("xiazdong").key("age").value(20).endObject().toString(); 
    System.out.println(str); 
  } 
 
} 

package com.xiazdong.json; 
 
import java.io.File; 
import java.io.FileReader; 
 
import weibo4j.org.json.JSONArray; 
import weibo4j.org.json.JSONObject; 
import weibo4j.org.json.JSONStringer; 
import weibo4j.org.json.JSONTokener; 
 
public class JsonStringerDemo { 
 
  public static void main(String[] args) throws Exception{ 
     
    JSONStringer js = new JSONStringer(); 
    JSONObject obj2 = new JSONObject(); 
    JSONObject obj3 = new JSONObject(); 
    JSONObject obj4 = new JSONObject(); 
    obj4.put("title", "book1").put("price", "$11"); 
    obj3.put("book", obj4); 
    obj3.put("author", new JSONObject().put("name", "author-1")); 
     
    JSONObject obj5 = new JSONObject(); 
    JSONObject obj6 = new JSONObject(); 
    obj6.put("title", "book2").put("price", "$22"); 
    obj5.put("book", obj6); 
    obj5.put("author", new JSONObject().put("name", "author-2")); 
     
    JSONArray obj7 = new JSONArray(); 
    obj7.put(obj3).put(obj5); 
     
     
     
    obj2.put("title","BOOK"); 
    obj2.put("signing", obj7); 
     
    js.object().key("session").value(obj2).endObject(); 
     
    System.out.println(js.toString()); 
     
    PrintWriter out = new PrintWriter(new FileOutputStream(1.txt)); 
    out.println(js.toString()); 
     
   
  } 
 
} 

{"section":{ 
    "title":"BOOK", 
    "signing":[ 
    { 
      "author": 
      { 
        "name":"author-1" 
      }, 
      "book": 
      { 
        "title":"book1", 
        "price":"$11" 
      } 
    }, 
    { 
      "author": 
      { 
        "name":"author-2" 
      }, 
      "book": 
      { 
        "title":"book2", 
        "price":"$22" 
      } 
    }   
    ]} 
  } 
} 

{ 
  'name':'xiazdong', 
  'book':['book1','book2'] 
} 
package com.xiazdong.json; 
 
import java.io.File; 
import java.io.FileReader; 
 
import weibo4j.org.json.JSONObject; 
import weibo4j.org.json.JSONTokener; 
 
public class JsonStringerDemo { 
 
  public static void main(String[] args) throws Exception{ 
    JSONObject obj = new JSONObject(new JSONTokener(new FileReader(new File("1.txt")))); 
    System.out.println(obj.getJSONArray("book").getString(1)); //可以读取book2 
  } 
 
} 

{"section":{ 
    "title":"BOOK", 
    "signing":[ 
    { 
      "author": 
      { 
        "name":"author-1" 
      }, 
      "book": 
      { 
        "title":"book1", 
        "price":"$11" 
      } 
    }, 
    { 
      "author": 
      { 
        "name":"author-2" 
      }, 
      "book": 
      { 
        "title":"book2", 
        "price":"$22" 
      } 
    }   
    ]} 
  } 
} 

package com.xiazdong.json; 
 
import java.io.File; 
import java.io.FileReader; 
 
import weibo4j.org.json.JSONObject; 
import weibo4j.org.json.JSONTokener; 
 
public class JsonStringerDemo { 
 
  public static void main(String[] args) throws Exception{ 
    JSONObject obj = new JSONObject(new JSONTokener(new FileReader(new File("1.txt")))); 
    System.out.println(obj.getJSONObject("section").getJSONArray("signing").getJSONObject(0).getJSONObject("author").getString("name")); <span style="white-space:pre">   </span>//获取author-1 
  } 
 
}