JSON官网(中文版)： http://www.json.org/json-zh.html
JSON(JavaScript Object Notation) 是一种轻量级(轻量级？简单、易 *** 作、快捷)的数据交换格式。主要目的就是给出一套通用的数据格式，大家按照这种格式定义自己的数据，方便数据的交换。特点是(相对来说) 易于人阅读和编写，易于机器解析和生成 。
Rules ：
JSON可以有以下格式 ：
以上是最基本的json知识，想深入了解的，请移步 官网 。
下面举个栗子给大家尝尝：
栗子好难看，上截图(截图太小看不清...戳这里看大图<-- !)：
NOTE ：左侧为JSON字符串，右侧为解析结构，方便查看。
福利 ：截图是我在一个在线 JSON Editor 上截的，体验一下-->JSON Editor，很好用推荐给大家。
认清了JSON，就要解析它。
你可以使用的JSON库 ：
本篇文章使用Gson解析JSON，Gson地址： http://code.google.com/p/google-gson/
根据JSON串的结构定义一个类(这里我们把这个类叫Result)，我们直接把得到的JSON串解析成这个类。class Result定义如下：
定义好了待解析成的class之后，接下来使用Gson解析JSON串就可以了：
步骤1:目标:将从webservice传回的json1
{
"status": 0,
"result": {
"location": {
"lng": 103.98964143811,
"lat": 30.586643130352
},
"formatted_address": "四川省成都市双流县北一街154",
"business": "簇桥,金花桥",
"addressComponent": {
"city": "成都市",
"district": "双流县",
"province": "四川省",
"street": "北一街",
"street_number": "154"
},
"cityCode": 75
}
}
2
先普及下json数据格式定义: json数据只有两种格式.
一种是对象: 一个大括号包裹的内容就是一个对象.里面是无数个逗号相间隔的键值对
{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" }
一种是数组:一个方括号包裹的内容就是一个数组,里面是无数个逗号相间隔的json对象
如:
{
"people": [
{
"firstName": "Brett",
"lastName": "McLaughlin",
"email": "aaaa"
},
{
"firstName": "Jason",
"lastName": "Hunter",
"email": "bbbb"
},
{
"firstName": "Elliotte",
"lastName": "Harold",
"email": "cccc"
}
]
}
END
步骤2 定义json数据格式对应的javaBean
public class Result {
private Integer status
private ResultDetail result
public Result() {
}
public Result(Integer status, ResultDetail result) {
super()
this.status = status
this.result = result
}
public ResultDetail getResult() {
return this.result
}
public Integer getStatus() {
return this.status
}
public void setResult( ResultDetail result ) {
this.result = result
}
public void setStatus( Integer status ) {
this.status = status
}
@Override
public String toString() {
return "Result [status=" + this.status + ", result=" + this.result
+ "]"
}
}
public class ResultDetail {
Location location
String formatted_address
AddressComponent addressComponent
String business
String cityCode
public ResultDetail() {
super()
// TODO Auto-generated constructor stub
}
public ResultDetail(Location location, String formatted_address,
AddressComponent addressComponent, String business, String cityCode) {
super()
this.location = location
this.formatted_address = formatted_address
this.addressComponent = addressComponent
this.business = business
this.cityCode = cityCode
}
public AddressComponent getAddressComponent() {
return this.addressComponent
}
public String getBusiness() {
return this.business
}
public String getCityCode() {
return this.cityCode
}
public String getFormatted_address() {
return this.formatted_address
}
public Location getLocation() {
return this.location
}
public void setAddressComponent( AddressComponent addressComponent ) {
this.addressComponent = addressComponent
}
public void setBusiness( String business ) {
this.business = business
}
public void setCityCode( String cityCode ) {
this.cityCode = cityCode
}
public void setFormatted_address( String formatted_address ) {
this.formatted_address = formatted_address
}
public void setLocation( Location location ) {
this.location = location
}
}
public class Location {
String lng
String lat
public Location() {
}
public Location(String lng, String lat) {
this.lng = lng
this.lat = lat
}
public String getLat() {
return this.lat
}
public String getLng() {
return this.lng
}
public void setLat( String lat ) {
this.lat = lat
}
public void setLng( String lng ) {
this.lng = lng
}
@Override
public String toString() {
return "Location [lng=" + this.lng + ", lat=" + this.lat + "]"
}
}
public class AddressComponent {
String city
String district
String province
String street
String street_number
public AddressComponent() {
super()
// TODO Auto-generated constructor stub
}
public AddressComponent(String city, String district, String province,
String street, String street_number) {
super()
this.city = city
this.district = district
this.province = province
this.street = street
this.street_number = street_number
}
public String getCity() {
return this.city
}
public String getDistrict() {
return this.district
}
public String getProvince() {
return this.province
}
public String getStreet() {
return this.street
}
public String getStreet_number() {
return this.street_number
}
public void setCity( String city ) {
this.city = city
}
public void setDistrict( String district ) {
this.district = district
}
public void setProvince( String province ) {
this.province = province
}
public void setStreet( String street ) {
this.street = street
}
public void setStreet_number( String street_number ) {
this.street_number = street_number
}
@Override
public String toString() {
return "AddressComponent [city=" + this.city + ", district="
+ this.district + ", province=" + this.province + ", street="
+ this.street + ", street_number=" + this.street_number + "]"
}
}
测试:
jsonString ( 目标json数据,已经在最上面写好的)
System.out.println( "jsonString:" + jsonString )
Gson gson = new Gson()
Result fromJson = gson.fromJson( jsonString.toString() ,
Result.class )
System.out.println( "******************************************" )
System.out.println( fromJson )
结果:
jsonString:{"status":0,"result":{"location":{"lng":103.98964143811,"lat":30.586643130352},"formatted_address":"四川省成都市双流县北一街154","business":"簇桥,金花桥","addressComponent":{"city":"成都市","district":"双流县","province":"四川省","street":"北一街","street_number":"154"},"cityCode":75}}
*******************************************
Result [status=0, result=ResultDetail [location=Location [lng=103.98964143811, lat=30.586643130352], formatted_address=四川省成都市双流县北一街154, addressComponent=AddressComponent [city=成都市, district=双流县, province=四川省, street=北一街, street_number=154], business=簇桥,金花桥, cityCode=75]]
可见,jsonString已经成功的被转换成了对应的javaBean
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