将字符串转换为JSONObject

我正在构建一个使用socket.IO与服务器进行通信的Android应用程序。关于socket我收到以下消息：将字符串转换为JSONObject

{"id":"presenterResponse","response":"accepted","sdpAnswer":"v=0\r\no=- 3689503004 3689503004 IN IP4 0.0.0.0\r\ns=Kurento Media Server\r\nc=IN IP4 0.0.0.0\r\nt=0 0\r\na=msid-semantic: WMS ARDAMS\r\na=group:BUNDLE audio video\r\nm=audio 1 UDP/TLS/RTP/SAVPF 111 0\r\na=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=mid:audio\r\na=rtcp:9 IN IP4 0.0.0.0\r\na=rtpmap:111 opus/48000/2\r\na=rtpmap:0 PCMU/8000\r\na=setup:active\r\na=sendrecv\r\na=rtcp-mux\r\na=fmtp:111 minptime=10; useinbandfec=1\r\na=maxptime:60\r\na=ssrc:3140217435 cname:[email protected]\r\na=ice-ufrag:aYIP\r\na=ice-pwd:sKftuHNg7pyX0FocNO0qh/\r\na=fingerprint:sha-256 33:B4:A7:4B:89:64:D2:54:AF:6B:FE:D4:5D:EF:4E:D6:AB:6F:11:B1:E7:31:87:D6:0D:22:3F:53:83:08:B7:73\r\nm=video 1 UDP/TLS/RTP/SAVPF 100\r\na=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=mid:video\r\na=rtcp:9 IN IP4 0.0.0.0\r\na=rtpmap:100 VP8/90000\r\na=rtcp-fb:100 ccm fir\r\na=rtcp-fb:100 nack\r\na=rtcp-fb:100 nack pli\r\na=rtcp-fb:100 goog-remb\r\na=setup:active\r\na=sendrecv\r\na=rtcp-mux\r\na=ssrc:2322920152 cname:[email protected]\r\na=ice-ufrag:aYIP\r\na=ice-pwd:sKftuHNg7pyX0FocNO0qh/\r\na=fingerprint:sha-256 33:B4:A7:4B:89:64:D2:54:AF:6B:FE:D4:5D:EF:4E:D6:AB:6F:11:B1:E7:31:87:D6:0D:22:3F:53:83:08:B7:73\r\nm=application 0 DTLS/SCTP 5000\r\na=inactive\r\na=mid:data\r\na=ice-ufrag:igJW\r\na=ice-pwd:skfFXPCVLtGwABgXg9xsMO\r\na=fingerprint:sha-256 33:B4:A7:4B:89:64:D2:54:AF:6B:FE:D4:5D:EF:4E:D6:AB:6F:11:B1:E7:31:87:D6:0D:22:3F:53:83:08:B7:73\r\n"}

我想现在要做的就是地图上的以下POJO类此对象：

进口org.webrtc.SessionDescription;

public class User { 

    private String id; 

    private String response; 

    private String name; 

    private String room; 

    private String email; 

    private String sdpOffer; 

    private SessionDescription sdpAnswer; 

    private String userType; 

    public User(){}; 

    public SessionDescription getSdpAnswer() { 
     return sdpAnswer; 
    } 

    public void setSdpAnswer(SessionDescription sdpAnswer) { 
     this.sdpAnswer = sdpAnswer; 
    } 

    public String getResponse() { 
     return response; 
    } 

    public void setResponse(String response) { 
     this.response = response; 
    } 

    public String getId() { 
     return id; 
    } 

    public void setId(String id) { 
     this.id = id; 
    } 

    public String getUserType() { 
     return userType; 
    } 

    public void setUserType(String userType) { 
     this.userType = userType; 
    } 

    public String getSdpOffer() { 
     return sdpOffer; 
    } 

    public void setSdpOffer(String sdpOffer) { 
     this.sdpOffer = sdpOffer; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getRoom() { 
     return room; 
    } 

    public void setRoom(String room) { 
     this.room = room; 
    } 

    public String getEmail() { 
     return email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 
}

到目前为止，我已经尝试在一个JSONObject JSONObject j = new JSONObject(message);转换消息并填充从JSONObject的我自己的对象，但没有奏效。如何映射User类上的字符串？

编辑：消息过来socket.IO从这样一个Node.js的服务器：在节点服务器通过我send.("new message",JSON.stringfy("sdpAnswer":sdpAnswer)); 发送消息在Android客户端我读它喜欢：

LoginActivity.mSocket.on("new message", new Emitter.Listener() { 

      @Override 
      public void call(Object... args) { 
       Log.i(TAG, "message back:received "); 
      JSONObject j = new JSONObject(args[0]); // this throws an error 
        Object = new JSONObject(args[0].toString()); 
        Log.i(TAG, "The received string is " + obj.toString()); //this throws java.lang.error can not convert from string to json object 


} 
)};

来源

2016-11-30 lapusan mirel

的可能的复制[如何在Java解析JSON（http://stackoverflow.com/questions/2591098/how-to-parse-json -in-java） –

已经尝试从字符串解析，但它没有工作。 –

如果你可以使用杰克逊，请查看https://www.mkyong.com/java/jackson-2-convert-java-object-to-from-json/ – vincent

使用Gson

String jsonString = "{jsonstringhere}"; 
    User user= new Gson().fromJson(jsonString, User.class);

来源

2016-11-30 14:27:52 Manza

使用GSON库。

将依赖关系添加到build.gradle文件。

compile 'com.google.code.gson:gson:2.8.0'

和解析JSON反对：

Gson gson = new Gson(); 
User user= gson.fromJson(message, User.class);

来源

2016-11-30 14:29:39

得到的错误无法传递给JSONObject已经尝试过：java.lang.IllegalStateException：期望的BEGIN_OBJECT，但是在第1行的STRING 2 –

private SessionDescription sdpAnswer;是对象，但在你的json它是一个字符串 –

我已经尝试过与对象直接，但它会引发另一个错误 –

将字符串转换为JSONObject

回答

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