Android gson序列化问题 [英] Android gson serialization issue
问题描述
我使用的是json数据类型和 gson 类来序列化我的对象。
这是我的代码关于序列化：
HttpPost post = new HttpPost（）;
post.setURI（新的URI（我的网址在这里））;
HashMap< String，String> hashMap = new HashMap< String，String>（）;
hashMap.put（username，username）;
hashMap.put（userCredentials，new Gson（）。toJson（credentials，UCredentials.class））;
//用户名和凭证是参数。
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）{
//如果成功。
}
除了 hashMap.put（userCredentials，new Gson（）。toJson（credentials，UCredentials.class））; 代码行一切正常。但是有了这一行......
Gson类给了我json：
{
userCredentials：
{
\emailOrUsername \：\asd@sadas.com\，
\password \：\113 \
}，
username：sdggfsdgf
}
并且它不是有效的json模式。我需要json输出：
{
userCredentials：
{
emailOrUsername ：asd@sadas.com，
password：113
}，
用户名：sdggfsdgf
}
我应该怎么做才能做到这一点？
在此先感谢。 / p>
您的第一个问题在这里：
hashMap.put（userCredentials，new Gson（）。toJson（credentials，UCredentials.class））;
进入HashMap的是一个JSON可解析的字符串。当你跟随它：
post.setEntity（new StringEntity（new Gson（）。toJson（hashMap）））;
该字符串因为不是对象而被转义。
你真正想要做的是这样的：
HttpPost post = new HttpPost（）;
post.setURI（new URI（my url goes here））;
//这里我们说Hashmap把Object当作它的值。
HashMap< String，String> hashMap = new HashMap< String，Object>（）;
hashMap.put（username，username）;
//这里我们把凭证对象放在HashMap
hashMap.put（userCredentials，credentials）中;
//用户名和凭证是参数。
post.setHeader（Content-Type，application / json; charset = utf-8）;
类型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）{
//如果成功。
}
这应该做你想做的事，但因为你说它不起作用....
我不确定UCredentials类。它似乎是你自己的代码。这是我的猜测：
public class UCredentials {
public String emailOrUsername;
公共字符串密码;
$ b $ p
$ b 这里是简化代码：
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）;
类型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}
如果您可以发布您的错误消息，我会尝试帮助调试。 b $ b
I have HttpPost request on my Android application to my .NET Web Api.
I am using json data type and gson class in order to serialize my object.
Here is my code about serialization:
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.
}
Except hashMap.put("userCredentials", new Gson().toJson(credentials, UCredentials.class)); code line everything works fine. But with this line...
Gson class gives me json as:
{
"userCredentials":
"{
\"emailOrUsername\":\"asd@sadas.com\",
\"password\":\"113\"
}",
"username":"sdggfsdgf"
}
and it is not valid json pattern. I need json output like:
{
"userCredentials":
{
"emailOrUsername":"asd@sadas.com",
"password":"113"
},
"username":"sdggfsdgf"
}
What should I do to achieve this?
Thanks in advance.
解决方案 Your first issue is here:
hashMap.put("userCredentials", new Gson().toJson(credentials, UCredentials.class));
What is going into the HashMap is a String that is JSON parsable. When you follow that up with:
post.setEntity(new StringEntity(new Gson().toJson(hashMap)));
That string gets escaped since it is not an object.
What you really want to do is something like this:
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.
}
This should do what you want, but since you say it doesn't work....
I'm not sure about the UCredentials class. It appears to be your own code. Here's a guess on my part:
public class UCredentials {
public String emailOrUsername;
public String password;
}
Here is simplified code:
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));
}
}
And this is the output:
{"userCredentials":{"emailOrUsername":"me@somehost.com","password":"pAsSwOrD"},"username":"ME"}
If you can post your error message, I'll try and help debug.
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