解析json之net.sf.json

转自：解析json之net.sf.json

下载地址
本次使用版本:http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-1.1/
最新版本:http://sourceforge.net/projects/json-lib/files/json-lib/
使用net.sf.json需要导入的包


JSONObject

 1 package com.itlwc.test;
 2  
 3 import net.sf.json.JSONArray;
 4 import net.sf.json.JSONObject;
 5  
 6 public class Test {
 7     public static void main(String[] args) {
 8         // 创建JSONObject
 9         JSONObject jsonObject = new JSONObject();
10         jsonObject.put("username", "lwc");
11         jsonObject.put("password", "123");
12         // 打印:1
13         System.out.println(jsonObject);
14  
15         // 增加属性,打印:2
16         jsonObject.element("sex", "男");
17         System.out.println(jsonObject);
18         
19         // 根据key返回,打印:3
20         System.out.println(jsonObject.get("sex"));
21  
22         // 判读输出对象的类型
23         boolean isArray = jsonObject.isArray();
24         boolean isEmpty = jsonObject.isEmpty();
25         boolean isNullObject = jsonObject.isNullObject();
26         // 打印:4
27         System.out.println("是否数组:" + isArray + " 是否空:" + isEmpty + " 是否空对象:"
28                 + isNullObject);
29         
30         // 把JSONArray增加到JSONObject中
31         JSONArray jsonArray = new JSONArray();
32         jsonArray.add(0, "lwc");
33         jsonArray.add(1, "nxj");
34         // 开始增加
35         jsonObject.element("student", jsonArray);
36         // 打印:5
37         System.out.println(jsonObject);
38     }
39 }
40 /*
41 打印结果
42     {"username":"lwc","password":"123"}
43     {"username":"lwc","password":"123","sex":"男"}
44     男
45     是否为数组:false 是否为空:false 是否为空对象:false
46     {"username":"lwc","password":"123","sex":"男","student":["lwc","nxj"]}
47 */

JSONArray

 1 package com.itlwc.test;
 2  
 3 import net.sf.json.JSONArray;
 4 import net.sf.json.JSONObject;
 5  
 6 public class Test {
 7     public static void main(String[] args) {
 8         //创建JSONArray
 9         JSONArray jsonArray = new JSONArray();
10         jsonArray.add(0, "lwc");   
11         jsonArray.add(1, "nxj");
12         jsonArray.element("mxj");
13         //打印:1
14         System.out.println(jsonArray);
15         
16         //根据下标返回,打印:2
17         System.out.println(jsonArray.get(0));
18         
19         //根据下标设置新值,打印:3
20         jsonArray.set(0, "itlwc");
21         System.out.println(jsonArray);
22         
23         //把JSONObject放入到JSONArray中
24         JSONObject jsonObject = new JSONObject();
25         jsonObject.put("username", "lwc");
26         jsonObject.put("password", "123");
27         //开始增加,打印:4
28         jsonArray.add(jsonObject);
29         System.out.println(jsonArray);
30         
31         //遍历,打印:5
32         for(int i=0;i<jsonArray.size();i++){
33             System.out.print(jsonArray.get(i)+"\t");
34         }
35     }
36 }
37 /*
38 打印结果
39     ["lwc","nxj","mxj"]
40     lwc
41     ["itlwc","nxj","mxj"]
42     ["itlwc","nxj","mxj",{"username":"lwc","password":"123"}]
43     itlwc    nxj    mxj    {"username":"lwc","password":"123"}
44 */


JavaBean与json字符串互转

 1 package com.itlwc.test;
 2  
 3 import net.sf.json.JSONObject;
 4  
 5 import com.itlwc.entity.Student;
 6  
 7 public class Test {
 8     public static void main(String[] args) {
 9         // JavaBean对象转json字符串
10         Student stu1 = new Student("lwc", "111111");
11         JSONObject jsonObject = JSONObject.fromObject(stu1);
12         System.out.println(jsonObject);
13  
14         // json字符串转JavaBean
15         String jsondata = "{\"password\":\"111111\",\"username\":\"lwc\"}";
16         JSONObject jsonObject1 = JSONObject.fromObject(jsondata);
17         Student stu2 = (Student) JSONObject.toBean(jsonObject1, Student.class);
18         System.out.println(stu2);
19     }
20 }
21 /*
22 打印结果:
23     {"password":"111111","username":"lwc"}
24     用户: lwc 密码:111111
25 */

List与json字符串互转

 1 package com.itlwc.test;
 2  
 3 import java.util.ArrayList;
 4 import java.util.List;
 5  
 6 import net.sf.json.JSONArray;
 7 import net.sf.json.JSONObject;
 8  
 9 import com.itlwc.entity.Student;
10  
11 public class Test {
12     public static void main(String[] args) {
13         // List转json字符串
14         List list = new ArrayList();
15         list.add(new Student("lwc", "111111"));
16         list.add(new Student("nxj", "222222"));
17         JSONArray jsonArray = JSONArray.fromObject(list);
18         System.out.println(jsonArray);
19  
20         // json字符串转List
21         List list1 = new ArrayList();
22         String jsondata = "[{\"password\":\"111111\",\"username\":\"lwc\"},{\"password\":\"222222\",\"username\":\"nxj\"}]";
23         JSONArray jsonArray1 = JSONArray.fromObject(jsondata);
24         for (int i = 0; i < jsonArray1.size(); i++) {
25             JSONObject jsonObject2 = jsonArray1.getJSONObject(i);
26             Student stu2 = (Student) JSONObject.toBean(jsonObject2,
27                     Student.class);
28             list1.add(stu2);
29         }
30         System.out.println(list1);
31     }
32 }
33 /*
34 打印结果:
35     [{"password":"111111","username":"lwc"},{"password":"222222","username":"nxj"}]
36     [用户: lwc 密码:111111, 用户: nxj 密码:222222]
37 */

Map与json字符串互转

 1 package com.itlwc.test;
 2  
 3 import java.util.HashMap;
 4 import java.util.Iterator;
 5 import java.util.Map;
 6 import java.util.Set;
 7  
 8 import net.sf.json.JSONObject;
 9  
10 import com.itlwc.entity.Student;
11  
12 public class Test {
13     public static void main(String[] args) {
14         // Map转json字符串
15         Map map = new HashMap();
16         map.put("1", new Student("lwc", "111111"));
17         map.put("2", new Student("nxj", "222222"));
18         JSONObject jsonMap = JSONObject.fromObject(map);
19         System.out.println(jsonMap);
20  
21         // json字符串转Map
22         String jsondata = "{\"2\":{\"password\":\"222222\",\"username\":\"nxj\"},\"1\":{\"password\":\"111111\",\"username\":\"lwc\"}}";
23         Map map1 = (Map) JSONObject.fromObject(jsondata);
24         Set set = map1.keySet();
25         Iterator ite = set.iterator();
26         while (ite.hasNext()) {
27             String key = (String) ite.next();
28             JSONObject jsonObject = JSONObject.fromObject(map1.get(key));
29             Student stu = (Student) JSONObject
30                     .toBean(jsonObject, Student.class);
31             System.out.println(key + " " + stu);
32         }
33  
34     }
35 }
36 /*
37 打印结果: 
38     {"2":{"password":"222222","username":"nxj"},"1":{"password":"111111","username":"lwc"}}
39     2 用户: nxj 密码:222222
40     1 用户: lwc 密码:111111
41 */

JSONArray与List互转

 1 package com.itlwc.test;
 2  
 3 import java.util.ArrayList;
 4 import java.util.Iterator;
 5 import java.util.List;
 6  
 7 import net.sf.json.JSONArray;
 8 import net.sf.json.JsonConfig;
 9  
10 import com.itlwc.entity.Student;
11  
12 public class Test {
13     public static void main(String[] args) {
14         //List转型JSONArray
15         List<Student> list = new ArrayList<Student>();  
16         list.add(new Student("lwc", "111111"));
17         list.add(new Student("nxj", "222222")); 
18         JSONArray jsonArray = JSONArray.fromObject(list);
19         System.out.println(jsonArray.toString());
20         
21         //JSONArray转型List
22         List<Student> list2 = JSONArray.toList(jsonArray, new Student(), new JsonConfig());
23         Iterator<Student> ite =  list2.iterator();
24         while(ite.hasNext()){
25             Student stu =ite.next();
26             System.out.println(stu);
27         }
28     }
29 }
30 /*
31 打印结果
32     [{"password":"111111","username":"lwc"},{"password":"222222","username":"nxj"}]
33     用户: lwc 密码:111111
34     用户: nxj 密码:222222
35 */

JSONArray与数组互转

 1 package com.itlwc.test;
 2  
 3 import net.sf.json.JSONArray;
 4  
 5 public class Test {
 6     public static void main(String[] args) {
 7         // Java数组转JSONArray
 8         boolean[] boolArray = new boolean[] { true, false, true };
 9         JSONArray jsonArray = JSONArray.fromObject(boolArray);
10         System.out.println(jsonArray.toString());
11  
12         // JSONArray转Java数组
13         Object obj[] = jsonArray.toArray();
14         for (Object o : obj) {
15             System.out.print(o + " ");
16         }
17     }
18 }
19 /*
20 打印结果 :
21     [true,false,true]
22     true false true 
23 */

XML与JSON互转

需要导入xom-1.1.jar

 1 package com.itlwc.test;
 2  
 3 import net.sf.json.JSON;
 4 import net.sf.json.JSONObject;
 5 import net.sf.json.xml.XMLSerializer;
 6  
 7 public class Test {
 8     public static void main(String[] args) throws Exception {
 9         // XML转JSON
10         String xml = "<root>" + "<name type='type'>zhaipuhong</name>"
11                 + "<gender>male</gender>" + "<birthday>" + "<year>1970</year>"
12                 + "<month>12</month>" + "<day>17</day>" + "</birthday>"
13                 + "</root>";
14         XMLSerializer xmlSerializer = new XMLSerializer();
15         JSON json = xmlSerializer.read(xml);
16         System.out.println(json.toString(2));
17  
18         // JSON转XML
19         String jsondata = "{\"root\":{" + "\"name\":\"zhaipuhong\","
20                 + "\"gender\":\"male\"," + "\"birthday\":{"
21                 + "\"year\":\"1970\"," + "\"month\":\"12\"," + "\"day\":\"17\""
22                 + "}" + "}" + "}";
23         JSONObject jsonObject = JSONObject.fromObject(jsondata);
24         String xmlstr = new XMLSerializer().write(jsonObject);
25         System.out.println(xmlstr);
26     }
27 }
28 /*
29 打印结果:
30     {
31       "name": "zhaipuhong",
32       "gender": "male",
33       "birthday":   {
34         "year": "1970",
35         "month": "12",
36         "day": "17"
37       }
38     }
39     <?xml version="1.0" encoding="UTF-8"?>
40     <o>
41         <root class="object">
42             <birthday class="object">
43                 <day type="string">17</day>
44                 <month type="string">12</month>
45                 <year type="string">1970</year>
46             </birthday>
47             <gender type="string">male</gender>
48             <name type="string">zhaipuhong</name>
49         </root>
50     </o>
51 */

 

posted @ 2021-08-02 16:30  Boblim  阅读(985)  评论(0)  编辑  收藏  举报