从文件解析json

#json.txt

{

name:"中国",
provinces:[
{name:"黑龙江",
citys:["佳木斯","大庆","哈尔滨","齐齐哈尔","牡丹江"]
},
{name:"辽宁",
citys:["沈阳","大连","盘锦"]
},
{name:"吉林",
citys:["吉林市","长春市","四平市"]
}
]
}
#JSonParser .java

import java.io.*;
import java.text.ParseException;

import org.json.*;

/**
* 从json文件读取数据，形成JSon对象，读取对象数据并打印
*/
public class JSonParser {

public static void main(String[] args) {

//从JSon文件读取数据
StringBuffer stringBuffer = new StringBuffer();
String line = null ;

try {
BufferedReader br = new BufferedReader(new FileReader(new File("json.txt")));
while( (line = br.readLine())!= null ){
stringBuffer.append(line);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

try {
//将Json文件数据形成JSONObject对象
JSONObject jsonObject = new JSONObject(stringBuffer.toString());

//获取JSONObject对象数据并打印
JSONArray provinces = jsonObject.getJSONArray("provinces") ;

String name = null ;
StringBuffer jsonFileInfo = new StringBuffer();
JSONArray citys = null ;

for (int i = 0; i < provinces.length(); i++) {

name = provinces.getJSONObject(i).getString("name");
jsonFileInfo.append("/nname:" + name + "/n" + "citys:");

citys = provinces.getJSONObject(i).getJSONArray("citys");

for (int j = 0; j < citys.length(); j++) {
jsonFileInfo.append(citys.getString(j)+"/t");
}
}

System.out.println(jsonFileInfo);

} catch (ParseException e) {
e.printStackTrace();
}

}
}

运行结果：

name:黑龙江
citys:佳木斯大庆哈尔滨齐齐哈尔牡丹江
name:辽宁
citys:沈阳大连盘锦
name:吉林
citys:吉林市长春市四平市