关于JSON与JAVA数据的转换

这里要用到一个JSON-lib这个Java类包，主要用于把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

1、List
Java代码

1. boolean[] boolArray = new boolean[]{true,false,true};
2. JSONArray jsonArray1 = JSONArray.fromObject( boolArray );
3. System.out.println( jsonArray1 );
4. // prints [true,false,true]
5.
6. List list = new ArrayList();
7. list.add( "first" );
8. list.add( "second" );
9. JSONArray jsonArray2 = JSONArray.fromObject( list );
10. System.out.println( jsonArray2 );
11. // prints ["first","second"]
12.
13. JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );
14. System.out.println( jsonArray3 );
15. // 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

1. Map map = new HashMap();
2. map.put( "name", "json" );
3. map.put( "bool", Boolean.TRUE );
4.
5. map.put( "int", new Integer(1) );
6. map.put( "arr", new String[]{"a","b"} );
7. map.put( "func", "function(i){ return this.arr; }" );
8. JSONObject json = JSONObject.fromObject( map );
9. System.out.println( json );
10. //{"func":function(i){ return this.arr; },"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; }" );
JSONObject json = JSONObject.fromObject( map );
System.out.println( json );
//{"func":function(i){ return this.arr; },"arr":["a","b"],"int":1,"name":"json","bool":true}

3、BEAN
Java代码

1. /**
2. * Bean.java
3. private String name = "json";
4. private int pojoId = 1;
5. private char[] options = new char[]{'a','f'};
6. private String func1 = "function(i){ return this.options; }";
7. private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options;");
8. */
9. JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );
10. System.out.println( jsonObject );
11. //{"func1":function(i){ return this.options; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options; }}

/**
* 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; }";
private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options;");
*/
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );
System.out.println( jsonObject );
//{"func1":function(i){ return this.options; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options; }}

4、BEANS
Java代码

1. /**
2. * private int row ;
3. private int col ;
4. private String value ;
5. *
6. */
7. List list = new ArrayList();
8. JsonBean2 jb1 = new JsonBean2();
9. jb1.setCol(1);
10. jb1.setRow(1);
11. jb1.setValue("xx");
12.
13. JsonBean2 jb2 = new JsonBean2();
14. jb2.setCol(2);
15. jb2.setRow(2);
16. jb2.setValue("");
17.
18.
19. list.add(jb1);
20. list.add(jb2);
21.
22. JSONArray ja = JSONArray.fromObject(list);
23. System.out.println( ja.toString() );
24. //[{"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

1. String json = "{name=/"json/",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";
2. JSONObject jsonObject = JSONObject.fromString(json);
3. Object bean = JSONObject.toBean( jsonObject );
4. assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );
5. assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );
6. assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );
7. assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );
8. assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );
9. List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );
10. 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

1. String json = "{/"value/":/"xx/",/"row/":1,/"col/":1}";
2. JSONObject jsonObject = JSONObject.fromString(json);
3. JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );
4. assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol()) );
5. assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );
6. 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[j];
</e>
</a>
<a class="array">
<e type="function" params="i,j">
return matrix[j];
</e>
</a>

JSONArray json = (JSONArray) XMLSerializer.read( xml );
System.out.println( json );
// prints [function(i,j){ return matrix[j]; }]