就是這個網站：http://www.jsonschema2pojo.org/
首先我有一個Json格式是這樣：
{
"id":"2993688d-4122-4c33-813c-2ddd10268c93",
"timestamp":"2017-04-15T13:54:37.254Z",
"lang":"en",
"result":{
"source":"agent",
"resolvedQuery":"我要去台北",
"action":"TheAction",
"actionIncomplete":false,
"parameters":{
"taiwan-city":[
"台北"
]
},
"contexts":[
],
"metadata":{
"intentId":"58e62519-f775-4a66-8655-ac772d157cec",
"webhookUsed":"false",
"webhookForSlotFillingUsed":"false",
"intentName":"TheIntent"
},
"fulfillment":{
"speech":"請稍等，正在幫你處理。",
"messages":[
{
"type":0,
"speech":"請稍等，正在幫你處理。"
}
]
},
"score":1.0
},
"status":{
"code":200,
"errorType":"success"
},
"sessionId":"1234567890"
}
看得出來這段要變成POJO有點不容易，只有對結構很熟悉的人能手刻出來，像我不熟悉就可以利用這個網站來轉換。開啟那個網站把Json貼上去
Source type我選JSON，不知為啥選JSON Schema產出的ZIP打不開
因為我是用Gson解析，所以選Gson，其他都預設。
試過勾Include toString，但它產出的很像是用Apache Commons Lang來做，而我引入了Apache Commons Lang函式庫還是不能用，因此沒勾。
2017-5-3補充：
因它產出的Apache Commons Lang似乎是初版的，程式碼是這樣：
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import org.apache.commons.lang.builder.ToStringBuilder;
...
因我當時是下載Apache Commons Lang 3.5那當然不能用了，只要加個3上去就可以了！像這樣：
...
org.apache.commons.lang3.builder.ToStringBuilder;
...
選好點下面的Zip，就自動幫你產出了！
左邊的Preview就是預覽。
解壓縮ZIP，把產出的Java檔放進Java Application專案中。
來使用吧：
package apiai;
import pojo.*;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import static org.apache.http.HttpHeaders.USER_AGENT;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public class HttpClientExample {
public static void main(String[] args) throws Exception {
HttpClientExample http = new HttpClientExample();
System.out.println("Testing 1 - Send Http GET request");
http.sendGet();
}
private void sendGet() throws Exception {
String url = "https://api.api.ai/v1/query?v=20150910&query=我要去台北&lang=en&sessionId=1234567890";
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
// add request header
request.addHeader("User-Agent", USER_AGENT);
request.addHeader("Authorization", "Bearer f67256b80e344e86affdd20487734835" );
HttpResponse response = client.execute(request);
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + response.getStatusLine().getStatusCode());
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String SerializationResult = "";
StringBuffer result = new StringBuffer();
String line = "";
while ((line = rd.readLine()) != null) {
result.append(line);
SerializationResult = result.toString();
}
Gson gson = new GsonBuilder().disableHtmlEscaping().setFieldNamingPolicy(FieldNamingPolicy.IDENTITY).create();//將特殊字元正常輸出不轉換
Principal r = gson.fromJson(SerializationResult, Principal.class);
System.out.println(r.getResult());
}
}
重點是46~50行
輸出結果：Testing 1 - Send Http GET request
Sending 'GET' request to URL : https://api.api.ai/v1/query?v=20150910&query=我要去台北&lang=en&sessionId=1234567890
Response Code : 200
Result{source=agent, resolvedQuery=我要去台北, action=TheAction, actionIncomplete=false, parameters=Parameters{taiwanCity=[台北]}, contexts=[], metadata=Metadata{intentId=58e62519-f775-4a66-8655-ac772d157cec, webhookUsed=false, webhookForSlotFillingUsed=false, intentName=TheIntent}, fulfillment=Fulfillment{speech=請稍等，正在幫你處理。, messages=[Message{type=0, speech=請稍等，正在幫你處理。}]}, score=1.0}
可以看得出非常成功，另外POJO的toString是我用IDE產出的，原因上面有說明，因為那網站產出的我還不會用
抓Result下一層資料的寫法：
Gson gson = new GsonBuilder().disableHtmlEscaping().setFieldNamingPolicy(FieldNamingPolicy.IDENTITY).create();//將特殊字元正常輸出不轉換 Principal r = gson.fromJson(SerializationResult, Principal.class); System.out.println(r.getResult().getResolvedQuery());就只是後面再加個get而已
如果要抓那個最底層的type 0呢？
Gson gson = new GsonBuilder().disableHtmlEscaping().setFieldNamingPolicy(FieldNamingPolicy.IDENTITY).create();//將特殊字元正常輸出不轉換 Principal r = gson.fromJson(SerializationResult, Principal.class); System.out.println(r.getResult().getFulfillment().getMessages().get(0).getType());恩比較特別，讓我稍微試了幾次
輸出：
Testing 1 - Send Http GET request Sending 'GET' request to URL : https://api.api.ai/v1/query?v=20150910&query=我要去台北&lang=en&sessionId=1234567890 Response Code : 200 0
附上Principal類別以作參考：
package pojo;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Principal {
@SerializedName("id")
@Expose
private String id;
@SerializedName("timestamp")
@Expose
private String timestamp;
@SerializedName("lang")
@Expose
private String lang;
@SerializedName("result")
@Expose
private Result result;
@SerializedName("status")
@Expose
private Status status;
@SerializedName("sessionId")
@Expose
private String sessionId;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTimestamp() {
return timestamp;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public String getLang() {
return lang;
}
public void setLang(String lang) {
this.lang = lang;
}
public Result getResult() {
return result;
}
public void setResult(Result result) {
this.result = result;
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
public String getSessionId() {
return sessionId;
}
public void setSessionId(String sessionId) {
this.sessionId = sessionId;
}
@Override
public String toString() {
return "Principal{" + "id=" + id + ", timestamp=" + timestamp + ", lang=" + lang + ", result=" + result + ", status=" + status + ", sessionId=" + sessionId + '}';
}
}
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