Question

我有一个POJO课程如下。

public class Client {

private static SecretKeySpec AES_Key;
private static final String key = "1234567890ABCDEF";

public static void main(String[] args) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {

    Socket mySocket = null;
    PrintWriter out = null;
    BufferedReader in = null;



    AES_Key = new SecretKeySpec(key.getBytes(), "AES");

    System.out.println(AES_Key);
     Cipher AES_Cipher = Cipher.getInstance("AES/ECB/PKCS5Padding", "BC");

    try {
        mySocket = new Socket("localhost", 4443);
        out = new PrintWriter(mySocket.getOutputStream(), true);
        in = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
    } catch (UnknownHostException e) {
        System.err.println("Don't know about host");
        System.exit(1);
    } catch (IOException e) {
        System.err.println("Couldn't get I/O for the connection to: localhost.");
        System.exit(1);
    }

    BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
    String fromServer;
    String fromUser;

    System.out.println("Client run ");

    while (true) {
        System.out.println("type message :");
         AES_Cipher.init(Cipher.ENCRYPT_MODE, AES_Key);
        fromUser = stdIn.readLine();

        byte plaintext[] = fromUser.getBytes();
        byte final_plaintext[] = AES_Cipher.doFinal(plaintext);
       // fromUser=toHexString(final_plaintext);
       String msg = new String(final_plaintext, "ASCII");

        System.out.println(final_plaintext);
    if (fromUser != null) {
            out.println(msg);
    }
         else{ break; }

        fromServer = in.readLine();
        if(fromServer!=null){
            System.out.println("Client receive :" + fromServer);
        }
        else{  break; }
    }

    out.close();
    in.close();
    stdIn.close();
    mySocket.close();
}
private static String toHexString(byte[] block) {
    StringBuffer buf = new StringBuffer();

    int len = block.length;

    for (int i = 0; i < len; i++) {
        byte2hex(block[i], buf);
        if (i < len - 1) {
            buf.append(":");
        }
    }
    return buf.toString();
}

/*
 * Converts a byte to hex digit and writes to the supplied buffer
 */
private static void byte2hex(byte b, StringBuffer buf) {
    char[] hexChars = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
        '9', 'A', 'B', 'C', 'D', 'E', 'F'};
    int high = ((b & 0xf0) >> 4);
    int low = (b & 0x0f);
    buf.append(hexChars[high]);
    buf.append(hexChars[low]);
}
}

所有JSON对象内部，只有一个地理空间属性具有纬度和经度，这是一个不同的POJO类。使用import java.util.List; public class LocationInfoDTO{ private int _id; private String name; private String type; private String fullName; private int location_id; private boolean isEurope; private String countryCode; private boolean coreCountry; private int iataAirportCode; private List<Geospatial> geo_location; public int get_id() { return _id; } public void set_id(int _id) { this._id = _id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getType() { return type; } public void setType(String type) { this.type = type; } public String getFullName() { return fullName; } public void setFullName(String fullName) { this.fullName = fullName; } public int getLocation_id() { return location_id; } public void setLocation_id(int location_id) { this.location_id = location_id; } public boolean isEurope() { return isEurope; } public void setEurope(boolean isEurope) { this.isEurope = isEurope; } public String getCountryCode() { return countryCode; } public void setCountryCode(String countryCode) { this.countryCode = countryCode; } public boolean isCoreCountry() { return coreCountry; } public void setCoreCountry(boolean coreCountry) { this.coreCountry = coreCountry; } public int getIataAirportCode() { return iataAirportCode; } public void getIataAirportCode(int iataAirportCode) { this.iataAirportCode = iataAirportCode; } @Override public String toString() { return "LocationInfoDTO [_id=" + _id + ", name=" + name + ", type=" + type + ", fullName=" + fullName + ", location_id=" + location_id + ", isEurope=" + isEurope + ", countryCode=" + countryCode + ", coreCountry=" + coreCountry + ", iataAirportCode=" + iataAirportCode + ", geo_location=" + geo_location + "]"; } public List<Geospatial> getGeo_location() { return geo_location; } public void setGeo_location(List<Geospatial> geo_location) { this.geo_location = geo_location; } } GSON除了{{1} }是fromJSON;

geo-location

这是一个示例JSON。

以这种方式触发

null

EDIT --------------------------------

将{"_id":376217,"key":null,"name":"test","fullName":"test, test","geo_position":{"latitude":52.52437,"longitude":13.41053}}更改为GsonBuilder gsonBuilder = new GsonBuilder(); Gson gson = gsonBuilder.create(); JSONArray array = new JSONArray(json); for(int i=0;i<array.length();i++){ System.out.println("Array:"+gson.fromJson(array.getJSONObject(i).toString(), LocationInfoDTO.class));

geo-location

Answer 1

错误说exaclty出了什么问题。你有geo-location的json对象，它需要一个列表。即使它是一个元素列表。改变

{"_id":376217,"key":null,"name":"test","fullName":"test, test","geo_position":{"latitude":52.52437,"longitude":13.41053}}

到

{"_id":376217,"key":null,"name":"test","fullName":"test, test","geo_position":[{"latitude":52.52437,"longitude":13.41053}]}

<强>更新

由于总会有一个纬度/经度，您应该更新您的POJO，以便geo_location是一个GeoSpatial对象，而不是List<GeoSpatial>

来自JSON的GSON有问题

1 个答案: