java读取json数据方法

拼搏现实的明天。 2022-07-12 11:53 165阅读 0赞

JSON-lib这个Java类包用于把bean,map和XML转换成JSON并能够把JSON转回成bean和DynaBean。  
  
下载地址:http://json-lib.sourceforge.net/  
还要需要的第3方包:  
org.apache.commons(3.2以上版本)  
org.apache.oro  
net.sf.ezmorph(ezmorph-1.0.4.jar)  
nu.xom

import net.sf.json.JSONArray;  
import net.sf.json.JSONObject;

1、List  
Java代码  
boolean\[\] boolArray = new boolean\[\]\{true,false,true\};        
JSONArray jsonArray1 = JSONArray.fromObject( boolArray );        
System.out.println( jsonArray1 );        
// prints \[true,false,true\]      
    
List list = new ArrayList();        
list.add( "first" );        
list.add( "second" );        
JSONArray jsonArray2 = JSONArray.fromObject( list );        
System.out.println( jsonArray2 );        
// prints \["first","second"\]      
    
JSONArray jsonArray3 = JSONArray.fromObject( "\['json','is','easy'\]" );        
System.out.println( jsonArray3 );        
// prints \["json","is","easy"\]      
  
            boolean\[\] boolArray = new boolean\[\]\{true,false,true\};    
            JSONArray jsonArray1 = JSONArray.fromObject( boolArray );    
            System.out.println( jsonArray1 );    
            // prints \[true,false,true\]    
              
            List list = new ArrayList();    
            list.add( "first" );    
            list.add( "second" );    
            JSONArray jsonArray2 = JSONArray.fromObject( list );    
            System.out.println( jsonArray2 );    
            // prints \["first","second"\]    
  
            JSONArray jsonArray3 = JSONArray.fromObject( "\['json','is','easy'\]" );    
            System.out.println( jsonArray3 );    
            // prints \["json","is","easy"\]     2、Map  
Java代码  
Map map = new HashMap();        
map.put( "name", "json" );        
map.put( "bool", Boolean.TRUE );        
    
map.put( "int", new Integer(1) );        
map.put( "arr", new String\[\]\{"a","b"\} );        
map.put( "func", "function(i)\{ return this.arr\[i\]; \}" );        
JSONObject json = JSONObject.fromObject( map );        
System.out.println( json );        
//\{"func":function(i)\{ return this.arr\[i\]; \},"arr":\["a","b"\],"int":1,"name":"json","bool":true\}    
  
         Map map = new HashMap();    
         map.put( "name", "json" );    
         map.put( "bool", Boolean.TRUE );    
          
         map.put( "int", new Integer(1) );    
         map.put( "arr", new String\[\]\{"a","b"\} );    
         map.put( "func", "function(i)\{ return this.arr\[i\]; \}" );    
         JSONObject json = JSONObject.fromObject( map );    
         System.out.println( json );    
         //\{"func":function(i)\{ return this.arr\[i\]; \},"arr":\["a","b"\],"int":1,"name":"json","bool":true\} 3、BEAN  
Java代码  
/\*\*    
     \* Bean.java    
        private String name = "json";      
        private int pojoId = 1;      
        private char\[\] options = new char\[\]\{'a','f'\};      
        private String func1 = "function(i)\{ return this.options\[i\]; \}";      
        private JSONFunction func2 = new JSONFunction(new String\[\]\{"i"\},"return this.options\[i\];");    
    \*/      
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );        
System.out.println( jsonObject );        
//\{"func1":function(i)\{ return this.options\[i\]; \},"pojoId":1,"name":"json","options":\["a","f"\],"func2":function(i)\{ return this.options\[i\]; \}\}      
  
/\*\*  
     \* Bean.java  
        private String name = "json";    
        private int pojoId = 1;    
        private char\[\] options = new char\[\]\{'a','f'\};    
        private String func1 = "function(i)\{ return this.options\[i\]; \}";    
        private JSONFunction func2 = new JSONFunction(new String\[\]\{"i"\},"return this.options\[i\];");  
    \*/  
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );    
System.out.println( jsonObject );    
//\{"func1":function(i)\{ return this.options\[i\]; \},"pojoId":1,"name":"json","options":\["a","f"\],"func2":function(i)\{ return this.options\[i\]; \}\}   4、BEANS  
Java代码  
/\*\*    
      \* private int row ;    
          private int col ;    
          private String value ;    
      \*    
      \*/    
List list = new ArrayList();    
         JsonBean2 jb1 = new JsonBean2();    
         jb1.setCol(1);    
         jb1.setRow(1);    
         jb1.setValue("xx");    
              
         JsonBean2 jb2 = new JsonBean2();    
         jb2.setCol(2);    
         jb2.setRow(2);    
         jb2.setValue("");    
              
              
         list.add(jb1);    
         list.add(jb2);    
              
         JSONArray ja = JSONArray.fromObject(list);    
         System.out.println( ja.toString() );    
         //\[\{"value":"xx","row":1,"col":1\},\{"value":"","row":2,"col":2\}\]    
  
/\*\*  
      \* private int row ;  
          private int col ;  
          private String value ;  
      \*  
      \*/  
List list = new ArrayList();  
         JsonBean2 jb1 = new JsonBean2();  
         jb1.setCol(1);  
         jb1.setRow(1);  
         jb1.setValue("xx");  
          
         JsonBean2 jb2 = new JsonBean2();  
         jb2.setCol(2);  
         jb2.setRow(2);  
         jb2.setValue("");  
          
          
         list.add(jb1);  
         list.add(jb2);  
          
         JSONArray ja = JSONArray.fromObject(list);  
         System.out.println( ja.toString() );  
         //\[\{"value":"xx","row":1,"col":1\},\{"value":"","row":2,"col":2\}\] 5、String to bean  
Java代码  
String json = "\{name=/"json/",bool:true,int:1,double:2.2,func:function(a)\{ return a; \},array:\[1,2\]\}";        
JSONObject jsonObject = JSONObject.fromString(json);        
Object bean = JSONObject.toBean( jsonObject );        
assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );        
  assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );        
  assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );        
   assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );        
   assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );        
  List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );        
  assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );      
  
String json = "\{name=/"json/",bool:true,int:1,double:2.2,func:function(a)\{ return a; \},array:\[1,2\]\}";    
JSONObject jsonObject = JSONObject.fromString(json);    
Object bean = JSONObject.toBean( jsonObject );    
assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );    
  assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );    
  assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );    
   assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );    
   assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );    
  List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );    
  assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );    Java代码  
String json = "\{/"value/":/"xx/",/"row/":1,/"col/":1\}";        
JSONObject jsonObject = JSONObject.fromString(json);    
  JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );        
   assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())  );        
     assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );        
     assertEquals( jsonObject.get( "value" ), bean.getValue() );      
  
String json = "\{/"value/":/"xx/",/"row/":1,/"col/":1\}";    
  JSONObject jsonObject = JSONObject.fromString(json);  
   JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );    
    assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())  );    
      assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );    
      assertEquals( jsonObject.get( "value" ), bean.getValue() );   6  json to xml  
1)  
JSONObject json = new JSONObject( true );    
String xml = XMLSerializer.write( json );    
  
<o class="object" null="true">    
  
2)  
JSONObject json = JSONObject.fromObject("\{/"name/":/"json/",/"bool/":true,/"int/":1\}");    
String xml = XMLSerializer.write( json );    
<o class="object">    
   <name type="string">json</name>    
   <bool type="boolean">true</bool>    
   <int type="number">1</int>    
</o>    
   <o class="object">  
      <name type="string">json</name>  
      <bool type="boolean">true</bool>  
      <int type="number">1</int>  
   </o>  
3)  
JSONArray json = JSONArray.fromObject("\[1,2,3\]");    
String xml = XMLSerializer.write( json );    
<a class="array">  
   <e type="number">1</e>    
   <e type="number">2</e>    
   <e type="number">3</e>    
</a>    
  
7 、xml to json  
<a class="array">    
  <e type="function" params="i,j">    
      return matrix\[i\]\[j\];    
  </e>    
</a>    
   <a class="array">  
     <e type="function" params="i,j">  
         return matrix\[i\]\[j\];  
     </e>  
   </a>  
    
JSONArray json = (JSONArray) XMLSerializer.read( xml );    
System.out.println( json );    
// prints \[function(i,j)\{ return matrix\[i\]\[j\]; \}\]