Android GSON序列化问题

我的Android应用程序上有对.NET Web Api的HttpPost请求.

我正在使用json数据类型和gson类来序列化我的对象.

这是我有关序列化的代码：

    HttpPost post = new HttpPost();
    post.setURI(new URI("my url goes here"));
    HashMap<String, String> hashMap = new HashMap<String, String>();
    hashMap.put("username", username);
    hashMap.put("userCredentials", new Gson().toJson(credentials, UCredentials.class));
    // username and credentials are parameters.
    post.setHeader("Content-Type", "application/json; charset=utf-8");
    post.setEntity(new StringEntity(new Gson().toJson(hashMap)));

    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpResponse httpResponse = httpClient.execute(post);
    if (httpResponse.getStatusLine().getStatusCode() == 200) {
        // If successful.
    }

hashMap.put(“ userCredentials”,new Gson().toJson(credentials,UCredentials.class))除外；代码行一切正常.但是有了这条线…

Gson类为我提供了json作为：

{
    "userCredentials":
        "{
            \"emailOrUsername\":\"asd@sadas.com\",
            \"password\":\"113\"
         }",
    "username":"sdggfsdgf"
}

这不是有效的json模式.我需要像这样的json输出：

{
        "userCredentials":
            {
                "emailOrUsername":"asd@sadas.com",
                "password":"113"
            },
        "username":"sdggfsdgf"
}

我应该怎么做才能做到这一点？

提前致谢.

解决方法:

您的第一个问题在这里：

 hashMap.put("userCredentials", new Gson().toJson(credentials, UCredentials.class)); 

HashMap中使用的是一个可JSON解析的字符串.当您跟进时：

post.setEntity(new StringEntity(new Gson().toJson(hashMap)));

该字符串被转义,因为它不是对象.

您真正想要做的是这样的：

HttpPost post = new HttpPost();

post.setURI(new URI("my url goes here"));
// Here we say that the Hashmap takes Object as its value.
HashMap<String, String> hashMap = new HashMap<String, Object>();
hashMap.put("username", username);
// Here we put the credentials object in the HashMap
hashMap.put("userCredentials", credentials);
// username and credentials are parameters.
post.setHeader("Content-Type", "application/json; charset=utf-8");
Type mapType = new TypeToken<HashMap<String, Object>>() {}.getType();
post.setEntity(new StringEntity(new Gson().toJson(hashMap, mapType)));

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(post);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
    // If successful.
}

这应该做您想要的,但是由于您说它不起作用….

我不确定UCredentials类.它似乎是您自己的代码.这是我的猜测：

public class UCredentials {

    public String emailOrUsername;

    public String password;

}

这是简化的代码：

import java.lang.reflect.Type;
import java.util.HashMap;
import com.google.gson.Gson;    
import com.google.gson.reflect.TypeToken;


public class Test {

    public static void main(String[] args) {

        Gson gson = new Gson();
        HashMap<String, Object> hashMap = new HashMap<String, Object>();

        UCredentials uc = new UCredentials();
        uc.emailOrUsername = "me@somehost.com";
        uc.password = "pAsSwOrD";

        hashMap.put("username", "ME");
        hashMap.put("userCredentials", uc);

        Type mapType = new TypeToken<HashMap<String, Object>>() {}.getType();
        System.out.println(gson.toJson(hashMap, mapType));
    }

}

这是输出：

{“userCredentials”:{“emailOrUsername”:”me@somehost.com”,”password”:”pAsSwOrD”},”username”:”ME”}

如果您可以发布错误消息,我将尽力帮助调试.

标签：gson,http-post,android
来源： https://codeday.me/bug/20191123/2066677.html