json字符串与对象互转

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需要的jar包：

gson-2.2.4.jar

json.jar

//json字符串转对象

//json字符串转对象@Testpublic void test5() {Gson gson = new Gson();String string;try {string = Utils.getStringByReadFile("city.json");CityInfo citys = gson.fromJson(string, CityInfo.class);List<City> list = citys.getCitys();for (City city : list) {System.out.print(city.getCode());}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}

封装了一个Utils类，目的是读取json文件的字符串

public class Utils {public static String getStringByReadFile(String name) {InputStream fis = Utils.class.getClassLoader().getResourceAsStream(name);StringBuilder sb = new StringBuilder();byte[] bytes = new byte[128];int len = 0;try {while( (len = fis.read(bytes)) != -1){sb.append(new String(bytes,0,len));}} catch (IOException e) {e.printStackTrace();}return sb.toString();}}

json文件：

{"info": [{"code": "C","key": "028","nearest": "NO","value": "成都"},{"code": "N","key": "0771","nearest": "NO","value": "南宁"},{"code": "L","key": "0772","nearest": "NO","value": "柳州"},{"code": "G","key": "0773","nearest": "NO","value": "桂林"}],"resultCode": "0","resultInfo": "SUCCESS"}

一个city 一个cityInof类：

public class City {private String code;private String key;private String nearest;private String value;public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getKey() {return key;}public void setKey(String key) {this.key = key;}public String getNearest() {return nearest;}public void setNearest(String nearest) {this.nearest = nearest;}public String getValue() {return value;}public void setValue(String value) {this.value = value;}}

public class CityInfo {private List<City> info;public List<City> getCitys() {return info;}public void setCitys(List<City> citys) {this.info = citys;}}

运行结果（因为只是获取city.getCode()所以结果是：

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