com.google.gson.jsonobject怎样获取

使用GoogleGson实现象json字符串间转换

需要gson-14jar

1JsonUtiljava

Java代码

package comsnailjson;

import javalangreflectType;

import comgooglegsonGson;

/

Java象JSON字符串相互转化工具类

@author penghuaiyi

@date 2013-08-10

/

public final class JsonUtil {

private JsonUtil(){}

/

象转换json字符串

@param obj

@return

/

public static String toJson(Object obj) {

Gson gson = new Gson();

return gsontoJson(obj);

}

/

json字符串转象

@param str

@param type

@return

/

public static T fromJson(String str, Type type) {

Gson gson = new Gson();

return gsonfromJson(str, type);

}

/

json字符串转象

@param str

@param type

@return

/

public static T fromJson(String str, Class type) {

Gson gson = new Gson();

return gsonfromJson(str, type);

}

}

2 Personjava

Java代码

package comsnailjson;

public class Person {

private int id;

private String name;

public int getId() {

return id;

}

public void setId(int id) {

thisid = id;

}

public String getName() {

return name;

}

public void setName(String name) {

thisname = name;

}

}

3 Testjava

Java代码

package comsnailjson;

import javautilArrayList;

import javautilHashMap;

import javautilList;

import javautilMap;

import javautilMapEntry;

import comgooglegsonreflectTypeToken;

public class Test {

/

般象转换

/

public static void objectToJson(){

Person person = new Person();

personsetId(1);

personsetName("one");

//javabean转换json字符串

String jsonStr = JsonUtiltoJson(person);

Systemoutprintln(jsonStr);

//json字符串转换javabean

Person newPerson = JsonUtilfromJson(jsonStr, Personclass);

Systemoutprintln(person == newPerson);

Systemoutprintln(newPersongetId()+","+newPersongetName());

}

/

复合结构数据转换(List)

/

public static void listToJson(){

Person person1 = new Person();

person1setId(1);

person1setName("one");

Person person2 = new Person();

person2setId(2);

person2setName("two");

List list = new ArrayList();

listadd(person1);

listadd(person2);

//javabean转换json字符串

String jsonStr = JsonUtiltoJson(list);

Systemoutprintln(jsonStr);

//json字符串转换javabean象

List rtn = JsonUtilfromJson(jsonStr, new TypeToken<List>(){}getType());

for(Person person : rtn){

Systemoutprintln(persongetId()+","+persongetName());

}

}

/

复合结构数据转换(Map)

/

public static void mapToJson(){

Person person1 = new Person();

person1setId(1);

person1setName("one");

Person person2 = new Person();

person2setId(2);

person2setName("two");

Map map = new HashMap();

mapput(person1getId(), person1);

mapput(person2getId(), person2);

//javabean转换json字符串

String jsonStr = JsonUtiltoJson(map);

Systemoutprintln(jsonStr);

//json字符串转换Map象

Map rtn = JsonUtilfromJson(jsonStr, new TypeToken<Map>(){}getType());

for(Entry entry : rtnentrySet()){

Integer key = entrygetKey();

Person newPerson = entrygetValue();

Systemoutprintln("key:"+key+","+newPersongetId()+","+newPersongetName());

}

}

public static void main(String[] args) {

objectToJson();

Systemoutprintln("");

listToJson();

Systemoutprintln("");

mapToJson();

}

}

需要准备的材料分别是：电脑、php编辑器、浏览器。

1、首先，打开php编辑器，新建php文件，例如：indexphp，填充问题基础代码。

2、在indexphp中，输入代码：

$b = json_decode($a);

echo $b->content->location->lat;

echo ',';

echo $b->content->location->lng;

3、浏览器运行indexphp页面，此时lng和lat的值都被打印了出来。

如果不是Android开发环境的话，首先需要引入处理JSON数据的包：json-lib-223-jdk15jar

Java样例程序如下：

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import netsfjsonJSONArray;

import netsfjsonJSONObject;

public class DoJSON {

public static void main(String[] args) {

JSONArray employees = new JSONArray(); //JSON数组

JSONObject employee = new JSONObject(); //JSON对象

employeeput("firstName", "Bill"); //按“键-值”对形式存储数据到JSON对象中

employeeput("lastName", "Gates");

employeesadd(employee); //将JSON对象加入到JSON数组中

employeeput("firstName", "George");

employeeput("lastName", "Bush");

employeesadd(employee);

employeeput("firstName", "Thomas");

employeeput("lastName", "Carter");

employeesadd(employee);

Systemoutprintln(employeestoString());

for(int i=0; i<employeessize(); i++) {

JSONObject emp = employeesgetJSONObject(i);

Systemoutprintln(emptoString());

Systemoutprintln("FirstName :\t" + empget("firstName"));

Systemoutprintln("LastName : \t" + empget("lastName"));

}

}

}

运行效果：

[{"firstName":"Bill","lastName":"Gates"},{"firstName":"George","lastName":"Bush"},{"firstName":"Thomas","lastName":"Carter"}]

{"firstName":"Bill","lastName":"Gates"}

FirstName : Bill

LastName : Gates

{"firstName":"George","lastName":"Bush"}

FirstName : George

LastName : Bush

{"firstName":"Thomas","lastName":"Carter"}

FirstName : Thomas

LastName : Carter

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