JSON — json-lib ——— java与json互转 实例代码片断（一）

http://json-lib.sourceforge.net/snippets.html#Creating%20a%20JSONArray%20from%20a%20JSON%20formatted%20string

Snippets

From Java to JSON

1. Creating a JSONObject from scratch
2. Creating a JSONObject from a JSON formatted string
3. Creating a JSONObject from a Map
4. Creating a JSONObject from a JavaBean
5. Creating a JSONArray from scratch
6. Creating a JSONArray from a JSON formatted string
7. Creating a JSONArray from a Collection
8. Creating a JSONArray from an array
9. JavaScript functions
10. Exclude properties
11. Exclude properties (with filters)

From JSON to Java

1. JSONObject to DynaBean
2. JSONObject to JavaBean
3. JSONArray to List
4. JSONArray to array
5. JSONArray to array (type conversion)
6. JSONObject to JavaBean, exclude properties with filters

From Java to JSON

Creating a JSONObject from scratch

JSONObject jsonObject = new JSONObject()
                               .element( "string", "JSON" )
                               .element( "integer", "1" )
                               .element( "double", "2.0" )
                               .element( "boolean", "true" );
 assertEquals( "JSON", jsonObject.getString("string") );
 assertEquals( 1, jsonObject.getInt("integer") );
 assertEquals( 2.0d, jsonObject.getDouble("double"), 0d );
 assertTrue( jsonObject.getBoolean("boolean") );

JSONObject jsonObject = new JSONObject() .element( "string", "JSON" ) .element( "integer", "1" ) .element( "double", "2.0" ) .element( "boolean", "true" ); assertEquals( "JSON", jsonObject.getString("string") ); assertEquals( 1, jsonObject.getInt("integer") ); assertEquals( 2.0d, jsonObject.getDouble("double"), 0d ); assertTrue( jsonObject.getBoolean("boolean") ); [ Index| From Java to JSON]

Creating a JSONObject from a JSON formatted string

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}";
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str );
 assertEquals( "JSON", jsonObject.getString("string") );
 assertEquals( 1, jsonObject.getInt("integer") );
 assertEquals( 2.0d, jsonObject.getDouble("double"), 0d );
 assertTrue( jsonObject.getBoolean("boolean") );

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}"; JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str ); assertEquals( "JSON", jsonObject.getString("string") ); assertEquals( 1, jsonObject.getInt("integer") ); assertEquals( 2.0d, jsonObject.getDouble("double"), 0d ); assertTrue( jsonObject.getBoolean("boolean") ); [ Index| From Java to JSON]

Creating a JSONObject from a Map

Map map = new HashMap();
 map.put( "string", "JSON" );
 map.put( "integer", "1" );
 map.put( "double", "2.0" );
 map.put( "boolean", "true" );
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( map );
 assertEquals( "JSON", jsonObject.getString("string") );
 assertEquals( 1, jsonObject.getInt("integer") );
 assertEquals( 2.0d, jsonObject.getDouble("double"), 0d );
 assertTrue( jsonObject.getBoolean("boolean") );

Map map = new HashMap(); map.put( "string", "JSON" ); map.put( "integer", "1" ); map.put( "double", "2.0" ); map.put( "boolean", "true" ); JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( map ); assertEquals( "JSON", jsonObject.getString("string") ); assertEquals( 1, jsonObject.getInt("integer") ); assertEquals( 2.0d, jsonObject.getDouble("double"), 0d ); assertTrue( jsonObject.getBoolean("boolean") ); [ Index| From Java to JSON]

Creating a JSONObject from a JavaBean

public class MyJavaBean {
    private String string;
    private int integer;
    private double dooble;
    private boolean bool;

    // getters & setters
}

 MyJavaBean bean = new MyJavaBean();
 bean.setString( "JSON" );
 bean.setInteger( 1 );
 bean.setDooble( 2.0d );
 bean.setBool( true );
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( bean );
 assertEquals( "JSON", jsonObject.getString("string") );
 assertEquals( 1, jsonObject.getInt("integer") );
 assertEquals( 2.0d, jsonObject.getDouble("dooble"), 0d );
 assertTrue( jsonObject.getBoolean("bool") );

public class MyJavaBean { private String string; private int integer; private double dooble; private boolean bool; // getters & setters } MyJavaBean bean = new MyJavaBean(); bean.setString( "JSON" ); bean.setInteger( 1 ); bean.setDooble( 2.0d ); bean.setBool( true ); JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( bean ); assertEquals( "JSON", jsonObject.getString("string") ); assertEquals( 1, jsonObject.getInt("integer") ); assertEquals( 2.0d, jsonObject.getDouble("dooble"), 0d ); assertTrue( jsonObject.getBoolean("bool") ); [ Index| From Java to JSON]

Creating a JSONArray from scratch

JSONArray jsonArray = new JSONArray()
                               .element( "JSON" )
                               .element( "1" )
                               .element( "2.0" )
                               .element( "true" );
 assertEquals( "JSON", jsonArray.getString(0) );
 assertEquals( 1, jsonArray.getInt(1) );
 assertEquals( 2.0d, jsonArray.getDouble(2), 0d );
 assertTrue( jsonArray.getBoolean(3) );

JSONArray jsonArray = new JSONArray() .element( "JSON" ) .element( "1" ) .element( "2.0" ) .element( "true" ); assertEquals( "JSON", jsonArray.getString(0) ); assertEquals( 1, jsonArray.getInt(1) ); assertEquals( 2.0d, jsonArray.getDouble(2), 0d ); assertTrue( jsonArray.getBoolean(3) ); [ Index| From Java to JSON]

Creating a JSONArray from a JSON formatted string

String str = "['JSON', 1, 2.0, true]";
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( str );
 assertEquals( "JSON", jsonArray.getString(0) );
 assertEquals( 1, jsonArray.getInt(1) );
 assertEquals( 2.0d, jsonArray.getDouble(2), 0d );
 assertTrue( jsonArray.getBoolean(3) );

String str = "['JSON', 1, 2.0, true]"; JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( str ); assertEquals( "JSON", jsonArray.getString(0) ); assertEquals( 1, jsonArray.getInt(1) ); assertEquals( 2.0d, jsonArray.getDouble(2), 0d ); assertTrue( jsonArray.getBoolean(3) ); [ Index| From Java to JSON]

Creating a JSONArray from a Collection

List list = new ArrayList();
 list.add( "JSON" );
 list.add( "1" );
 list.add( "2.0" );
 list.add( "true" );
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( list );
 assertEquals( "JSON", jsonArray.getString(0) );
 assertEquals( 1, jsonArray.getInt(1) );
 assertEquals( 2.0d, jsonArray.getDouble(2), 0d );
 assertTrue( jsonArray.getBoolean(3) );

List list = new ArrayList(); list.add( "JSON" ); list.add( "1" ); list.add( "2.0" ); list.add( "true" ); JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( list ); assertEquals( "JSON", jsonArray.getString(0) ); assertEquals( 1, jsonArray.getInt(1) ); assertEquals( 2.0d, jsonArray.getDouble(2), 0d ); assertTrue( jsonArray.getBoolean(3) ); [ Index| From Java to JSON]

Creating a JSONArray from an array

Object[] array = new Object[]{ "JSON", "1", "2.0", "true" };
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( array );
 assertEquals( "JSON", jsonArray.getString(0) );
 assertEquals( 1, jsonArray.getInt(1) );
 assertEquals( 2.0d, jsonArray.getDouble(2), 0d );
 assertTrue( jsonArray.getBoolean(3) );

Object[] array = new Object[]{ "JSON", "1", "2.0", "true" }; JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( array ); assertEquals( "JSON", jsonArray.getString(0) ); assertEquals( 1, jsonArray.getInt(1) ); assertEquals( 2.0d, jsonArray.getDouble(2), 0d ); assertTrue( jsonArray.getBoolean(3) ); [ Index| From Java to JSON]

JavaScript functions

String str = "{'func': function( param ){ doSomethingWithParam(param); }}";
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str );
 JSONFunction func = (JSONFunction) jsonObject.get("func");
 ArrayAssertions.assertEquals( new String[]{"param"}, func.getParams() );
 assertEquals( "doSomethingWithParam(param);", func.getText() );

String str = "{'func': function( param ){ doSomethingWithParam(param); }}"; JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str ); JSONFunction func = (JSONFunction) jsonObject.get("func"); ArrayAssertions.assertEquals( new String[]{"param"}, func.getParams() ); assertEquals( "doSomethingWithParam(param);", func.getText() ); [ Index| From Java to JSON]

Exclude properties

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}";
 JsonConfig jsonConfig = new JsonConfig();
 jsonConfig.setExcludes( new String[]{ "double", "boolean" } );
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str, jsonConfig );
 assertEquals( "JSON", jsonObject.getString("string") );
 assertEquals( 1, jsonObject.getInt("integer") );
 assertFalse( jsonObject.has("double") );
 assertFalse( jsonObject.has("boolean") );

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}"; JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setExcludes( new String[]{ "double", "boolean" } ); JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str, jsonConfig ); assertEquals( "JSON", jsonObject.getString("string") ); assertEquals( 1, jsonObject.getInt("integer") ); assertFalse( jsonObject.has("double") ); assertFalse( jsonObject.has("boolean") ); [ Index| From Java to JSON]

Exclude properties (with filters)

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}";
 JsonConfig jsonConfig = new JsonConfig();
 jsonConfig.setJsonPropertyFilter( new PropertyFilter(){
    public boolean apply( Object source, String name, Object value ) {
       if( "double".equals(value) || "boolean".equals(value) ){
          return true;
      }
       return false;
   }
});
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str, jsonConfig );
 assertEquals( "JSON", jsonObject.getString("string") );
 assertEquals( 1, jsonObject.getInt("integer") );
 assertFalse( jsonObject.has("double") );
 assertFalse( jsonObject.has("boolean") );

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}"; JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setJsonPropertyFilter( new PropertyFilter(){ public boolean apply( Object source, String name, Object value ) { if( "double".equals(value) || "boolean".equals(value) ){ return true; } return false; } }); JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str, jsonConfig ); assertEquals( "JSON", jsonObject.getString("string") ); assertEquals( 1, jsonObject.getInt("integer") ); assertFalse( jsonObject.has("double") ); assertFalse( jsonObject.has("boolean") ); [ Index| From Java to JSON]

From JSON to Java

JSONObject to DynaBean

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}";
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str );
DynaBean bean = (DynaBean) JSONSerializer.toJava( jsonObject );
 assertEquals( "JSON", bean.get("string") );
 assertEquals( new Integer(1), bean.get("integer") );
 assertEquals( new Double(2.0), bean.get("double") );
 assertEquals( Boolean.TRUE, bean.get("boolean") );

String str = "{'string':'JSON', 'integer': 1, 'double': 2.0, 'boolean': true}"; JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( str ); DynaBean bean = (DynaBean) JSONSerializer.toJava( jsonObject ); assertEquals( "JSON", bean.get("string") ); assertEquals( new Integer(1), bean.get("integer") ); assertEquals( new Double(2.0), bean.get("double") ); assertEquals( Boolean.TRUE, bean.get("boolean") ); [ Index| From JSON to Java]

JSONObject to JavaBean

public class MyJavaBean {
    private String string;
    private int integer;
    private double dooble;
    private boolean bool;

    // getters & setters
}

 MyJavaBean bean = new MyJavaBean();
 bean.setString( "JSON" );
 bean.setInteger( 1 );
 bean.setDooble( 2.0d );
 bean.setBool( true );
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( bean );
 JsonConfig jsonConfig = new JsonConfig();
 jsonConfig.setRootClass( MyJavaBean.class );
MyJavaBean bean2 = (MyJavaBean) JSONSerializer.toJava( jsonObject, jsonConfig );
assertNotNull( bean2 );
 assertEquals( "JSON", bean2.getString() );
 assertEquals( 1, bean2.getInteger() );
 assertEquals( 2.0d, bean2.getDooble(), 0d );
assertTrue( bean2.getBool() );

public class MyJavaBean { private String string; private int integer; private double dooble; private boolean bool; // getters & setters } MyJavaBean bean = new MyJavaBean(); bean.setString( "JSON" ); bean.setInteger( 1 ); bean.setDooble( 2.0d ); bean.setBool( true ); JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( bean ); JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setRootClass( MyJavaBean.class ); MyJavaBean bean2 = (MyJavaBean) JSONSerializer.toJava( jsonObject, jsonConfig ); assertNotNull( bean2 ); assertEquals( "JSON", bean2.getString() ); assertEquals( 1, bean2.getInteger() ); assertEquals( 2.0d, bean2.getDooble(), 0d ); assertTrue( bean2.getBool() ); [ Index| From JSON to Java]

JSONArray to List

List input = new ArrayList();
 input.add( "JSON" );
 input.add( "1" );
 input.add( "2.0" );
 input.add( "true" );
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );
List output = (List) JSONSerializer.toJava( jsonArray );
ArrayAssertions.assertEquals( input, output );

List input = new ArrayList(); input.add( "JSON" ); input.add( "1" ); input.add( "2.0" ); input.add( "true" ); JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input ); List output = (List) JSONSerializer.toJava( jsonArray ); ArrayAssertions.assertEquals( input, output ); [ Index| From JSON to Java]

JSONArray to array

List input = new ArrayList();
 input.add( "JSON" );
 input.add( "1" );
 input.add( "2.0" );
 input.add( "true" );
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );
 JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );
Object[] output = (Object[]) JSONSerializer.toJava( jsonArray, jsonConfig );
 Object[] expected = new Object[]{ "JSON", "1", "2.0", "true" };
ArrayAssertions.assertEquals( expected, output);

List input = new ArrayList(); input.add( "JSON" ); input.add( "1" ); input.add( "2.0" ); input.add( "true" ); JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input ); JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY ); Object[] output = (Object[]) JSONSerializer.toJava( jsonArray, jsonConfig ); Object[] expected = new Object[]{ "JSON", "1", "2.0", "true" }; ArrayAssertions.assertEquals( expected, output); [ Index| From JSON to Java]

JSONArray to array (type conversion)

List input = new ArrayList();
 input.add( "1" );
 input.add( "2" );
 input.add( "3.0" );
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );
 JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );
jsonConfig.setRootClass( Integer.TYPE );
 int[] output = (int[]) JSONSerializer.toJava( jsonArray, jsonConfig );
 int[] expected = new int[]{ 1, 2, 3 };
ArrayAssertions.assertEquals( expected, output);

List input = new ArrayList(); input.add( "1" ); input.add( "2" ); input.add( "3.0" ); JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input ); JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY ); jsonConfig.setRootClass( Integer.TYPE ); int[] output = (int[]) JSONSerializer.toJava( jsonArray, jsonConfig ); int[] expected = new int[]{ 1, 2, 3 }; ArrayAssertions.assertEquals( expected, output); [ Index| From JSON to Java]

JSONObject to JavaBean, exclude properties with filters

public class MyJavaBean {
    private String string;
    private int integer;
    private double dooble = 0d;
    private boolean bool;

    // getters & setters
}

 MyJavaBean bean = new MyJavaBean();
 bean.setString( "JSON" );
 bean.setInteger( 1 );
 bean.setDooble( 2.0d );
 bean.setBool( true );
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( bean );
 JsonConfig jsonConfig = new JsonConfig();
 jsonConfig.setRootClass( MyJavaBean.class );
 jsonConfig.setJavaPropertyFilter( new PropertyFilter(){
    public boolean apply( Object source, String name, Object value ) {
       if( "bool".equals( name ) || "dooble".equals( name ) ){
          return true;
      }
       return false;
   }
});
MyJavaBean bean2 = (MyJavaBean) JSONSerializer.toJava( jsonObject, jsonConfig );
assertNotNull( bean2 );
 assertEquals( "JSON", bean2.getString() );
 assertEquals( 1, bean2.getInteger() );
assertEquals( 0d, bean2.getDooble(), 0d );
assertFalse( bean2.getBool() );

public class MyJavaBean { private String string; private int integer; private double dooble = 0d; private boolean bool; // getters & setters } MyJavaBean bean = new MyJavaBean(); bean.setString( "JSON" ); bean.setInteger( 1 ); bean.setDooble( 2.0d ); bean.setBool( true ); JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON( bean ); JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setRootClass( MyJavaBean.class ); jsonConfig.setJavaPropertyFilter( new PropertyFilter(){ public boolean apply( Object source, String name, Object value ) { if( "bool".equals( name ) || "dooble".equals( name ) ){ return true; } return false; } }); MyJavaBean bean2 = (MyJavaBean) JSONSerializer.toJava( jsonObject, jsonConfig ); assertNotNull( bean2 ); assertEquals( "JSON", bean2.getString() ); assertEquals( 1, bean2.getInteger() ); assertEquals( 0d, bean2.getDooble(), 0d ); assertFalse( bean2.getBool() ); [ Index| From JSON to Java]