解析json方式之net.sf.json
前面转载了json解析的技术:fastjson,今天说下另外一种技术。
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
- package com.itlwc.test;
- import net.sf.json.JSONArray;
- import net.sf.json.JSONObject;
- public class Test {
- public static void main(String[] args) {
- // 创建JSONObject
- JSONObject jsonObject = new JSONObject();
- jsonObject.put("username", "lwc");
- jsonObject.put("password", "123");
- // 打印:1
- System.out.println(jsonObject);
- // 增加属性,打印:2
- jsonObject.element("sex", "男");
- System.out.println(jsonObject);
- // 根据key返回,打印:3
- System.out.println(jsonObject.get("sex"));
- // 判读输出对象的类型
- boolean isArray = jsonObject.isArray();
- boolean isEmpty = jsonObject.isEmpty();
- boolean isNullObject = jsonObject.isNullObject();
- // 打印:4
- System.out.println("是否数组:" + isArray + " 是否空:" + isEmpty + " 是否空对象:"
- + isNullObject);
- // 把JSONArray增加到JSONObject中
- JSONArray jsonArray = new JSONArray();
- jsonArray.add(0, "lwc");
- jsonArray.add(1, "nxj");
- // 开始增加
- jsonObject.element("student", jsonArray);
- // 打印:5
- System.out.println(jsonObject);
- }
- }
- /*
- 打印结果
- {"username":"lwc","password":"123"}
- {"username":"lwc","password":"123","sex":"男"}
- 男
- 是否为数组:false 是否为空:false 是否为空对象:false
- {"username":"lwc","password":"123","sex":"男","student":["lwc","nxj"]}
- */
JSONArray
- package com.itlwc.test;
- import net.sf.json.JSONArray;
- import net.sf.json.JSONObject;
- public class Test {
- public static void main(String[] args) {
- //创建JSONArray
- JSONArray jsonArray = new JSONArray();
- jsonArray.add(0, "lwc");
- jsonArray.add(1, "nxj");
- jsonArray.element("mxj");
- //打印:1
- System.out.println(jsonArray);
- //根据下标返回,打印:2
- System.out.println(jsonArray.get(0));
- //根据下标设置新值,打印:3
- jsonArray.set(0, "itlwc");
- System.out.println(jsonArray);
- //把JSONObject放入到JSONArray中
- JSONObject jsonObject = new JSONObject();
- jsonObject.put("username", "lwc");
- jsonObject.put("password", "123");
- //开始增加,打印:4
- jsonArray.add(jsonObject);
- System.out.println(jsonArray);
- //遍历,打印:5
- for(int i=0;i<jsonArray.size();i++){
- System.out.print(jsonArray.get(i)+"\t");
- }
- }
- }
- /*
- 打印结果
- ["lwc","nxj","mxj"]
- lwc
- ["itlwc","nxj","mxj"]
- ["itlwc","nxj","mxj",{"username":"lwc","password":"123"}]
- itlwc nxj mxj {"username":"lwc","password":"123"}
- */
JavaBean与json字符串互转
- package com.itlwc.test;
- import net.sf.json.JSONObject;
- import com.itlwc.entity.Student;
- public class Test {
- public static void main(String[] args) {
- // JavaBean对象转json字符串
- Student stu1 = new Student("lwc", "111111");
- //这个方法是将对象转为json对象(不论是将json字符串还是java对象都是这个方法)
- JSONObject jsonObject = JSONObject.fromObject(stu1);
- System.out.println(jsonObject);
- // json字符串转JavaBean
- String jsondata = "{\"password\":\"111111\",\"username\":\"lwc\"}";
- JSONObject jsonObject1 = JSONObject.fromObject(jsondata);
- Student stu2 = (Student) JSONObject.toBean(jsonObject1, Student.class);
- System.out.println(stu2);
- }
- }
- /*
- 打印结果:
- {"password":"111111","username":"lwc"}
- 用户: lwc 密码:111111
- */
List与json字符串互转
- package com.itlwc.test;
- import java.util.ArrayList;
- import java.util.List;
- import net.sf.json.JSONArray;
- import net.sf.json.JSONObject;
- import com.itlwc.entity.Student;
- public class Test {
- public static void main(String[] args) {
- // List转json字符串
- List list = new ArrayList();
- list.add(new Student("lwc", "111111"));
- list.add(new Student("nxj", "222222"));
- //将list集合转为json数组对象
- JSONArray jsonArray = JSONArray.fromObject(list);
- System.out.println(jsonArray);
- // json字符串转List
- List list1 = new ArrayList();
- String jsondata = "[{\"password\":\"111111\",\"username\":\"lwc\"},{\"password\":\"222222\",\"username\":\"nxj\"}]";
- JSONArray jsonArray1 = JSONArray.fromObject(jsondata);
- for (int i = 0; i < jsonArray1.size(); i++) {
- JSONObject jsonObject2 = jsonArray1.getJSONObject(i);
- Student stu2 = (Student) JSONObject.toBean(jsonObject2,
- Student.class);
- list1.add(stu2);
- }
- System.out.println(list1);
- }
- }
- /*
- 打印结果:
- [{"password":"111111","username":"lwc"},{"password":"222222","username":"nxj"}]
- [用户: lwc 密码:111111, 用户: nxj 密码:222222]
- */
Map与json字符串互转
- package com.itlwc.test;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.Map;
- import java.util.Set;
- import net.sf.json.JSONObject;
- import com.itlwc.entity.Student;
- public class Test {
- public static void main(String[] args) {
- // Map转json字符串
- Map map = new HashMap();
- map.put("1", new Student("lwc", "111111"));
- map.put("2", new Student("nxj", "222222"));
- JSONObject jsonMap = JSONObject.fromObject(map);
- System.out.println(jsonMap);
- // json字符串转Map
- String jsondata = "{\"2\":{\"password\":\"222222\",\"username\":\"nxj\"},\"1\":{\"password\":\"111111\",\"username\":\"lwc\"}}";
- Map map1 = (Map) JSONObject.fromObject(jsondata);
- Set set = map1.keySet();
- Iterator ite = set.iterator();
- while (ite.hasNext()) {
- String key = (String) ite.next();
- JSONObject jsonObject = JSONObject.fromObject(map1.get(key));
- Student stu = (Student) JSONObject
- .toBean(jsonObject, Student.class);
- System.out.println(key + " " + stu);
- }
- }
- }
- /*
- 打印结果:
- {"2":{"password":"222222","username":"nxj"},"1":{"password":"111111","username":"lwc"}}
- 2 用户: nxj 密码:222222
- 1 用户: lwc 密码:111111
- */
JSONArray与List互转
- package com.itlwc.test;
- import java.util.ArrayList;
- import java.util.Iterator;
- import java.util.List;
- import net.sf.json.JSONArray;
- import net.sf.json.JsonConfig;
- import com.itlwc.entity.Student;
- public class Test {
- public static void main(String[] args) {
- //List转型JSONArray
- List<Student> list = new ArrayList<Student>();
- list.add(new Student("lwc", "111111"));
- list.add(new Student("nxj", "222222"));
- JSONArray jsonArray = JSONArray.fromObject(list);
- System.out.println(jsonArray.toString());
- //JSONArray转型List
- List<Student> list2 = JSONArray.toList(jsonArray, new Student(), new JsonConfig());
- Iterator<Student> ite = list2.iterator();
- while(ite.hasNext()){
- Student stu =ite.next();
- System.out.println(stu);
- }
- }
- }
- /*
- 打印结果
- [{"password":"111111","username":"lwc"},{"password":"222222","username":"nxj"}]
- 用户: lwc 密码:111111
- 用户: nxj 密码:222222
- */
JSONArray与数组互转
- package com.itlwc.test;
- import net.sf.json.JSONArray;
- public class Test {
- public static void main(String[] args) {
- // Java数组转JSONArray
- boolean[] boolArray = new boolean[] { true, false, true };
- JSONArray jsonArray = JSONArray.fromObject(boolArray);
- System.out.println(jsonArray.toString());
- // JSONArray转Java数组
- Object obj[] = jsonArray.toArray();
- for (Object o : obj) {
- System.out.print(o + " ");
- }
- }
- }
- /*
- 打印结果 :
- [true,false,true]
- true false true
- */
XML与JSON互转
需要导入xom-1.1.jar
- package com.itlwc.test;
- import net.sf.json.JSON;
- import net.sf.json.JSONObject;
- import net.sf.json.xml.XMLSerializer;
- public class Test {
- public static void main(String[] args) throws Exception {
- // XML转JSON
- String xml = "<root>" + "<name type='type'>zhaipuhong</name>"
- + "<gender>male</gender>" + "<birthday>" + "<year>1970</year>"
- + "<month>12</month>" + "<day>17</day>" + "</birthday>"
- + "</root>";
- XMLSerializer xmlSerializer = new XMLSerializer();
- JSON json = xmlSerializer.read(xml);
- System.out.println(json.toString(2));
- // JSON转XML
- String jsondata = "{\"root\":{" + "\"name\":\"zhaipuhong\","
- + "\"gender\":\"male\"," + "\"birthday\":{"
- + "\"year\":\"1970\"," + "\"month\":\"12\"," + "\"day\":\"17\""
- + "}" + "}" + "}";
- JSONObject jsonObject = JSONObject.fromObject(jsondata);
- String xmlstr = new XMLSerializer().write(jsonObject);
- System.out.println(xmlstr);
- }
- }
- /*
- 打印结果:
- {
- "name": "zhaipuhong",
- "gender": "male",
- "birthday": {
- "year": "1970",
- "month": "12",
- "day": "17"
- }
- }
- <?xml version="1.0" encoding="UTF-8"?>
- <o>
- <root class="object">
- <birthday class="object">
- <day type="string">17</day>
- <month type="string">12</month>
- <year type="string">1970</year>
- </birthday>
- <gender type="string">male</gender>
- <name type="string">zhaipuhong</name>
- </root>
- </o>
- */