我遇到了问题，我无法弄清楚如何解决它。
我有以下代码：
public static void main(String[] args)
{
BufferedReader br = null;
StringBuilder sb = null;
String line = null;
Scanner scanner = new Scanner(System.in);
//print the menu
System.out.println("Choose from the menu:");
System.out.println("1 -> Town weather ");
System.out.println("2 -> About");
System.out.println("3 -> Exit");
try
{
//read from keyboard the value
//int choice = scanner.nextInt();
int choice = 1;
switch (choice)
{
case 1:
System.out.println("Give desired town:");
String town = str.nextLine();
URL json = new URL("http://api.openweathermap.org/data/2.5/weather?q=" + town + "&APPID=");
HttpURLConnection url = (HttpURLConnection) json.openConnection();
url.setRequestMethod("GET");
url.connect();
//read the data from url
br = new BufferedReader(new InputStreamReader(url.getInputStream()));
sb = new StringBuilder();
while ((line = br.readLine()) != null)
{
sb.append(line + '\n');
}
String txt = sb.toString();
break;
case 2:
break;
case 3:
System.exit(0);
}
}
catch (InputMismatchException i)
{
System.out.println("Wrong choice!");
}
catch (MalformedURLException m)
{
System.out.println("Wrong URL!");
}
catch (IOException io)
{
System.out.println("Wrong town! The url shows 404 not found");
}
catch (NullPointerException np)
{
System.out.println("Null exception!");
np.printStackTrace();
}
catch (Exception e) //catch all exception where not previous caught.
{
e.printStackTrace();
}
}
所以我将json数据转换为txt变量。问题是，我的项目需要以列表的形式显示所有数据（或其中的一部分）。我必须以人类可以阅读它们的方式展示它们。
我尝试过漂亮的打印，但我不想显示符号{}，：
理想情况下，我想将这些数据存储到数据库中，然后显示其中一些数据，同时保留它们。第一步是将它们分成数组，只分割字符串而不分割任何特殊字符。
任何人都可以帮我吗？我搜索了stackoverflow，我发现了许多回复，但没有一个对我有效。
编辑：我更新了代码，用我的完整主文件和下面的内容你可以看到json响应：
{
"coord": {
"lon": -86.97,
"lat": 34.8
},
"weather": [
{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}
],
"base": "stations",
"main": {
"temp": 270.48,
"pressure": 1033,
"humidity": 30,
"temp_min": 270.15,
"temp_max": 271.15
},
"visibility": 16093,
"wind": {
"speed": 2.6,
"deg": 340
},
"clouds": {
"all": 1
},
"dt": 1514921700,
"sys": {
"type": 1,
"id": 226,
"message": 0.0021,
"country": "US",
"sunrise": 1514897741,
"sunset": 1514933354
},
"id": 4830668,
"name": "Athens",
"cod": 200
}
提前感谢您的帮助。
答案 0 :(得分：1)
尝试下面的代码将您的响应转换为json对象，您可以将其转换为所需的格式，或稍后继续保存到DB
FOR答案 1 :(得分：0)
我不太确定你的意思是什么？＃34;作为一个清单＆＃34;。如果我正确理解您的问题，我认为存储和显示数据的最佳方法是在从响应中获取原始数据后，能够将JSON数据解析并转换为Java对象。
第一步是弄清楚JSON模式的样子，然后从中提取/创建Java Object。您可以使用jar或lib轻松完成此操作，或者您也可以通过将原始JSON复制并粘贴到http://www.jsonschema2pojo.org/来在线完成此操作，它将允许您下载包含所有转换所需的Java对象的zip文件。
一旦有了Java对象，就可以使用任何JSON libaray从JSON到Java对象进行转换。
这是一个使用Gson库的简单演示示例：
String txt = sb.toString();
Gson gson = new Gson();
Container jsonDataHolder = new Container();
try{
jsonDataHolder = gson.fromJson(txt , Container.class);
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (JsonSyntaxException e) {
e.printStackTrace();
}
// Finally don't forget to close BufferedReader.close()
// After Casting is completed, you can pretty much do anything with the object.
System.out.println("City Name : " + jsonDataHolder.getName())
// Below is the individual Java Object classes that are required to do the full scope casting of the JSON object you've provided.
public class Container {
@SerializedName("coord")
@Expose
private Coord coord;
@SerializedName("weather")
@Expose
private List<Weather> weather = null;
@SerializedName("base")
@Expose
private String base;
@SerializedName("main")
@Expose
private Main main;
@SerializedName("visibility")
@Expose
private Integer visibility;
@SerializedName("wind")
@Expose
private Wind wind;
@SerializedName("clouds")
@Expose
private Clouds clouds;
@SerializedName("dt")
@Expose
private Integer dt;
@SerializedName("sys")
@Expose
private Sys sys;
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("name")
@Expose
private String name;
@SerializedName("cod")
@Expose
private Integer cod;
public Coord getCoord() {
return coord;
}
public void setCoord(Coord coord) {
this.coord = coord;
}
public List<Weather> getWeather() {
return weather;
}
public void setWeather(List<Weather> weather) {
this.weather = weather;
}
public String getBase() {
return base;
}
public void setBase(String base) {
this.base = base;
}
public Main getMain() {
return main;
}
public void setMain(Main main) {
this.main = main;
}
public Integer getVisibility() {
return visibility;
}
public void setVisibility(Integer visibility) {
this.visibility = visibility;
}
public Wind getWind() {
return wind;
}
public void setWind(Wind wind) {
this.wind = wind;
}
public Clouds getClouds() {
return clouds;
}
public void setClouds(Clouds clouds) {
this.clouds = clouds;
}
public Integer getDt() {
return dt;
}
public void setDt(Integer dt) {
this.dt = dt;
}
public Sys getSys() {
return sys;
}
public void setSys(Sys sys) {
this.sys = sys;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getCod() {
return cod;
}
public void setCod(Integer cod) {
this.cod = cod;
}
}
public class Coord {
@SerializedName("lon")
@Expose
private Double lon;
@SerializedName("lat")
@Expose
private Double lat;
public Double getLon() {
return lon;
}
public void setLon(Double lon) {
this.lon = lon;
}
public Double getLat() {
return lat;
}
public void setLat(Double lat) {
this.lat = lat;
}
}
public class Main {
@SerializedName("temp")
@Expose
private Double temp;
@SerializedName("pressure")
@Expose
private Integer pressure;
@SerializedName("humidity")
@Expose
private Integer humidity;
@SerializedName("temp_min")
@Expose
private Double tempMin;
@SerializedName("temp_max")
@Expose
private Double tempMax;
public Double getTemp() {
return temp;
}
public void setTemp(Double temp) {
this.temp = temp;
}
public Integer getPressure() {
return pressure;
}
public void setPressure(Integer pressure) {
this.pressure = pressure;
}
public Integer getHumidity() {
return humidity;
}
public void setHumidity(Integer humidity) {
this.humidity = humidity;
}
public Double getTempMin() {
return tempMin;
}
public void setTempMin(Double tempMin) {
this.tempMin = tempMin;
}
public Double getTempMax() {
return tempMax;
}
public void setTempMax(Double tempMax) {
this.tempMax = tempMax;
}
}
public class Wind {
@SerializedName("speed")
@Expose
private Double speed;
@SerializedName("deg")
@Expose
private Integer deg;
public Double getSpeed() {
return speed;
}
public void setSpeed(Double speed) {
this.speed = speed;
}
public Integer getDeg() {
return deg;
}
public void setDeg(Integer deg) {
this.deg = deg;
}
}
public class Clouds {
@SerializedName("all")
@Expose
private Integer all;
public Integer getAll() {
return all;
}
public void setAll(Integer all) {
this.all = all;
}
}
public class Sys {
@SerializedName("type")
@Expose
private Integer type;
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("message")
@Expose
private Double message;
@SerializedName("country")
@Expose
private String country;
@SerializedName("sunrise")
@Expose
private Integer sunrise;
@SerializedName("sunset")
@Expose
private Integer sunset;
public Integer getType() {
return type;
}
public void setType(Integer type) {
this.type = type;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Double getMessage() {
return message;
}
public void setMessage(Double message) {
this.message = message;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public Integer getSunrise() {
return sunrise;
}
public void setSunrise(Integer sunrise) {
this.sunrise = sunrise;
}
public Integer getSunset() {
return sunset;
}
public void setSunset(Integer sunset) {
this.sunset = sunset;
}
}
<强>假设：
希望这有助于我的朋友。