Java OkHttp:一个简单的GET请求:response.body().string()返回json can';t转换为gson
在邮递员中发送请求时,我得到以下输出:Java OkHttp:一个简单的GET请求:response.body().string()返回json can';t转换为gson,java,unicode,character-encoding,gson,okhttp,Java,Unicode,Character Encoding,Gson,Okhttp,在邮递员中发送请求时,我得到以下输出: { "valid": false, "reason": "taken", "msg": "Username has already been taken", "desc": "That username has been taken. Please choose another." } 但是,当使用okhttp进行此操作时,我遇到了编码问题,无法使用gson将生成的json字符串转换为Java对象 我有以下代码: publ
{
"valid": false,
"reason": "taken",
"msg": "Username has already been taken",
"desc": "That username has been taken. Please choose another."
}
但是,当使用okhttp
进行此操作时,我遇到了编码问题,无法使用gson
将生成的json字符串转换为Java对象
我有以下代码:
public static void main(String[] args) throws Exception {
TwitterChecker checker = new TwitterChecker();
TwitterJson twitterJson = checker.checkUsername("dogster");
System.out.println(twitterJson.getValid()); //NPE
System.out.println(twitterJson.getReason());
System.out.println("Done");
}
public TwitterJson checkUsername(String username) throws Exception {
HttpUrl.Builder urlBuilder = HttpUrl.parse("https://twitter.com/users/username_available").newBuilder();
urlBuilder.addQueryParameter("username", username);
String url = urlBuilder.build().toString();
Request request = new Request.Builder()
.url(url)
.addHeader("Content-Type", "application/json; charset=utf-8")
.build();
OkHttpClient client = new OkHttpClient();
Call call = client.newCall(request);
Response response = call.execute();
System.out.println(response.body().string());
Gson gson = new Gson();
return gson.fromJson(
response.body().string(), new TypeToken<TwitterJson>() {
}.getType());
}
然后在尝试访问twitterJson时抛出一个NullPointerException
。调试器将该对象显示为null
TwitterJson:
@Generated("net.hexar.json2pojo")
@SuppressWarnings("unused")
public class TwitterJson {
@Expose
private String desc;
@Expose
private String msg;
@Expose
private String reason;
@Expose
private Boolean valid;
public String getDesc() {
return desc;
}
public String getMsg() {
return msg;
}
public String getReason() {
return reason;
}
public Boolean getValid() {
return valid;
}
...
如何使用okhttp解决编码问题?这是因为响应对象只能使用一次。OKHTTP在他们的报告中这样说。调用execute之后,将调用响应对象两次。将response.body().string()的结果存储到变量中,然后将其转换为GSON 如果我用一个hello world的例子
private void testOkHttpClient() {
OkHttpClient httpClient = new OkHttpClient();
try {
Request request = new Request.Builder()
.url("https://www.google.com")
.build();
Call call = httpClient.newCall(request);
Response response = call.execute();
System.out.println("First time " + response.body().string()); // I get the response
System.out.println("Second time " + response.body().string()); // This will be empty
} catch (IOException e) {
e.printStackTrace();
}
}
第二次为空的原因是响应对象只能使用一次。你也是
按原样返回响应。不要做任何事
System.out.println(response.body().string()); // Instead of doing a sysOut return the value.
或
将响应的值存储到JSON,然后将其转换为GSON,然后返回值
编辑:关于Unicode字符。事实证明,由于我所在的国家不是英语国家,所以我接受的json也不是英语。我添加了这个标题:
.addHeader("Accept-Language", Locale.US.getLanguage())
请求解决这个问题
.addHeader("Accept-Language", Locale.US.getLanguage())