解析json之net.sf.json
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");
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"));
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
*/