java json
2015-09-25 15:08
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创建json
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201909/20/9c4e6d6e2143ab78e609ae9a8f82a961.png)
//construct json and output it
public String jsonTest() throws JSONException{
JSONObject json=new JSONObject();
JSONArray jsonMembers = new JSONArray();
JSONObject member1 = new JSONObject();
member1.put("loginname", "zhangfan");
member1.put("password", "userpass");
member1.put("email","10371443@qq.com");
member1.put("sign_date", "2007-06-12");
jsonMembers.put(member1);
JSONObject member2 = new JSONObject();
member2.put("loginname", "zf");
member2.put("password", "userpass");
member2.put("email","8223939@qq.com");
member2.put("sign_date", "2008-07-16");
jsonMembers.put(member2);
json.put("users", jsonMembers);
return json.toString();
}
解析json
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201909/20/9c4e6d6e2143ab78e609ae9a8f82a961.png)
//construct json from String and resolve it.
public String jsonTest2() throws JSONException{
String jsonString="{\"users\":[{\"loginname\":\"zhangfan\",\"password\":\"userpass\",\"email\":\"10371443@qq.com\"},{\"loginname\":\"zf\",\"password\":\"userpass\",\"email\":\"822393@qq.com\"}]}";
JSONObject json= new JSONObject(jsonString);
JSONArray jsonArray=json.getJSONArray("users");
String loginNames="loginname list:";
for(int i=0;i<jsonArray.length();i++){
JSONObject user=(JSONObject) jsonArray.get(i);
String userName=(String) user.get("loginname");
if(i==jsonArray.length()-1){
loginNames+=userName;
}else{
loginNames+=userName+",";
}
}
return loginNames;
}
Java不像PHP解析和生产JSON总是一个比较痛苦的过程。但是使用JSONObject和JSONArray会让整个过程相对舒服一些。
需要依赖的包:commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar ezmorph.jar json-lib-2.2.2-jdk15.jar
1. 创建一个JSONObject对象:
结果:
解析JSON字符串:
返回:
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201909/20/9c4e6d6e2143ab78e609ae9a8f82a961.png)
//construct json and output it
public String jsonTest() throws JSONException{
JSONObject json=new JSONObject();
JSONArray jsonMembers = new JSONArray();
JSONObject member1 = new JSONObject();
member1.put("loginname", "zhangfan");
member1.put("password", "userpass");
member1.put("email","10371443@qq.com");
member1.put("sign_date", "2007-06-12");
jsonMembers.put(member1);
JSONObject member2 = new JSONObject();
member2.put("loginname", "zf");
member2.put("password", "userpass");
member2.put("email","8223939@qq.com");
member2.put("sign_date", "2008-07-16");
jsonMembers.put(member2);
json.put("users", jsonMembers);
return json.toString();
}
解析json
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201909/20/9c4e6d6e2143ab78e609ae9a8f82a961.png)
//construct json from String and resolve it.
public String jsonTest2() throws JSONException{
String jsonString="{\"users\":[{\"loginname\":\"zhangfan\",\"password\":\"userpass\",\"email\":\"10371443@qq.com\"},{\"loginname\":\"zf\",\"password\":\"userpass\",\"email\":\"822393@qq.com\"}]}";
JSONObject json= new JSONObject(jsonString);
JSONArray jsonArray=json.getJSONArray("users");
String loginNames="loginname list:";
for(int i=0;i<jsonArray.length();i++){
JSONObject user=(JSONObject) jsonArray.get(i);
String userName=(String) user.get("loginname");
if(i==jsonArray.length()-1){
loginNames+=userName;
}else{
loginNames+=userName+",";
}
}
return loginNames;
}
JSONObject与JSONArray的使用
Java不像PHP解析和生产JSON总是一个比较痛苦的过程。但是使用JSONObject和JSONArray会让整个过程相对舒服一些。
需要依赖的包:commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar ezmorph.jar json-lib-2.2.2-jdk15.jar
1. 创建一个JSONObject对象:
package com.yunos.tv.video.resource.controller.web; import java.util.ArrayList; import java.util.HashMap; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class Test { public static void main(String[] args) { //JsonObject和JsonArray区别就是JsonObject是对象形式,JsonArray是数组形式 //创建JsonObject第一种方法 JSONObject jsonObject = new JSONObject(); jsonObject.put("UserName", "ZHULI"); jsonObject.put("age", "30"); jsonObject.put("workIn", "ALI"); System.out.println("jsonObject1:" + jsonObject); //创建JsonObject第二种方法 HashMap<String, String> hashMap = new HashMap<String, String>(); hashMap.put("UserName", "ZHULI"); hashMap.put("age", "30"); hashMap.put("workIn", "ALI"); System.out.println("jsonObject2:" + JSONObject.fromObject(hashMap)); //创建一个JsonArray方法1 JSONArray jsonArray = new JSONArray(); jsonArray.add(0, "ZHULI"); jsonArray.add(1, "30"); jsonArray.add(2, "ALI"); System.out.println("jsonArray1:" + jsonArray); //创建JsonArray方法2 ArrayList<String> arrayList = new ArrayList<String>(); arrayList.add("ZHULI"); arrayList.add("30"); arrayList.add("ALI"); System.out.println("jsonArray2:" + JSONArray.fromObject(arrayList)); //如果JSONArray解析一个HashMap,则会将整个对象的放进一个数组的值中 System.out.println("jsonArray FROM HASHMAP:" + JSONArray.fromObject(hashMap)); //组装一个复杂的JSONArray JSONObject jsonObject2 = new JSONObject(); jsonObject2.put("UserName", "ZHULI"); jsonObject2.put("age", "30"); jsonObject2.put("workIn", "ALI"); jsonObject2.element("Array", arrayList); System.out.println("jsonObject2:" + jsonObject2); } }
结果:
jsonObject1:{"UserName":"ZHULI","age":"30","workIn":"ALI"} jsonObject2:{"workIn":"ALI","age":"30","UserName":"ZHULI"} jsonArray1:["ZHULI","30","ALI"] jsonArray2:["ZHULI","30","ALI"] jsonArray FROM HASHMAP:[{"workIn":"ALI","age":"30","UserName":"ZHULI"}] jsonObject2:{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}
解析JSON字符串:
package com.yunos.tv.video.resource.controller.web; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class Test { public static void main(String[] args) { String jsonString = "{\"UserName\":\"ZHULI\",\"age\":\"30\",\"workIn\":\"ALI\",\"Array\":[\"ZHULI\",\"30\",\"ALI\"]}"; //将Json字符串转为java对象 JSONObject obj = JSONObject.fromObject(jsonString); //获取Object中的UserName if (obj.has("UserName")) { System.out.println("UserName:" + obj.getString("UserName")); } //获取ArrayObject if (obj.has("Array")) { JSONArray transitListArray = obj.getJSONArray("Array"); for (int i = 0; i < transitListArray.size(); i++) { System.out.print("Array:" + transitListArray.getString(i) + " "); } } } }
返回:
UserName:ZHULI Array:ZHULI Array:30 Array:ALI
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