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JSON的使用

2025-09-23 22:24:57 责编:小OO

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JSON使用

对各种格式的JAVA数据如List,Map,Array转换为json数据

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

{

PrintWriter out = response.getWriter();

//JSON数据：一个boolean类型的数组，输出为JSON数据

// boolean[] boolArray = new boolean[]{true,false,true};

// JSONArray jsonArray1 = JSONArray.fromObject( boolArray );

//out.println(jsonArray1);

// System.out.println( jsonArray1 );

// prints [true,false,true] 打印出 [true,false,true]

//将一个简单的列表转换为一个JSON数据

// List list = new ArrayList();

// list.add( "first" );

// list.add( "second" );

// JSONArray jsonArray2 = JSONArray.fromObject( list );

//out.println(jsonArray2); //输出到客户端接收是按照json数据

// System.out.println( jsonArray2 );

//打印出 prints ["first

//直接将一个字符串表示的数据转换为json数据

// JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );

//out.println(jsonArray3);

// System.out.println( jsonArray3 );

//将标准的JSON数据，构造一个简单的JSON结构的数据

// String s = "{'name':'www','id':'2','age':'19'}";

// out.write(s);

//将MAP数据转换为JSON数据

// 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

// map.put( "func", "function(i){ return this.arr[i]; }" );

// JSONObject json = JSONObject.fromObject( map );

// System.out.println( json );

// out.println(json);

// out.close();

//将List中包含的对象转换成为json数据

List list = new ArrayList();

User jb1 = new User(2,"刘亲",20);

User jb2 = new User(4,"吴军",30);

list.add(jb1);

list.add(jb2);

JSONArray ja = JSONArray.fromObject(list);

System.out.println( ja.toString() );

out.println(ja);

out.close();

}

JSON与JAVA数据的转换

关键字: json java

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

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]

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

12.

13. JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );

14. System.out.println( jsonArray3 );

15. // prints ["json

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

JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );

System.out.println( jsonArray3 );

// prints ["json

2、Map

Java代码

1.Map map = new HashMap();

2. map.put( "name", "json" );

3. map.put( "bool", Boolean.TRUE );

5. map.put( "int", new Integer(1) );

6. map.put( "arr", new String[]{"a","b"} );

7. map.put( "func", "function(i){ return this.arr[i]; }" );

8. JSONObject json = JSONObject.fromObject( map );

9. System.out.println( json );

10. //{"func":function(i){ return this.arr[i]; },"arr":["a

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

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

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[i]; }";

7. private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");

8. */

9.JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );

10.System.out.println( jsonObject );

11. //{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json

/**

* 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

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

/**

* 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

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

JSONObject json = new JSONObject( true );

String xml = XMLSerializer.write( json );

JSONObject json = JSONObject.fromObject("{\\"name\\":\\"json\\",\\"bool\\":true,\\"int\\":1}");

String xml = XMLSerializer.write( json );

json

true

json

true

JSONArray json = JSONArray.fromObject("[1,2,3]");

String xml = XMLSerializer.write( json );

7 、xml to json

return matrix[i][j];

JSONArray json = (JSONArray) XMLSerializer.read( xml );

System.out.println( json );

// prints [function(i,j){ return matrix[i][j]; }]

http://falchion.javaeye.com/blog/187548

(转贴)针对JSON的基于java和js多种操作方法与格式转换方法

针对JSON的基于java和js多种操作与格式转换方法

org.json包

http://www.json.org/java/index.html

1. JSONObject，用一个HashMap来保存一个JSON对象的所有属性。

2. JSONArray用ArrayList来保存数据。JSON来自javascript，javascript中Array也是Object，不知这里是如何保存这种关系的。

3. 一些跟字符串有关的类，以及异常类。

4. 一些工具类，比如xml和json转换的类，将http头和cookies转换为json的类，

基于org.json包的JSON-LIB：bean，map，collection，java array，xml与json间的转换。

http://json-lib.sourceforge.net/

http://json-lib.sourceforge.net/usage.html

Stringtree JSON:JSON与java对象间的转换

http://www.stringtree.org/stringtree-json.html

三个关键类：

∙JSONReader.java

∙JSONWriter.java

∙JSONValidator.java

JSONValidator用来检查JSON的有效性。

JSONReader将一个正确形式的JSON字符串转换为一个java对象。

JSONWriter将一个java对象转换为一个JSON字符串。

XSLTJSON：用xslt将xml转换为json

http://www.bramstein.nl/xsltjson/

JSONT：基于js和自定义规则，转换JSON为任意其他格式

http://goessner.net/articles/jsont/

服务端：

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

{

PrintWriter out = response.getWriter();

String s = "{'name':'www','id':'2','age':'19'}";

out.write(s);

out.close();

}

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