Java 将JSON发布到服务器并接收响应
我有一个名为Java 将JSON发布到服务器并接收响应,java,android,json,post,httpurlconnection,Java,Android,Json,Post,Httpurlconnection,我有一个名为findMeareStaturantDao的类,它包含一些方法,这些方法将在我的活动中使用AsyncTask内部类对服务器进行网络调用。我的请求后方法有问题,如下所示: @Override public String findMeARestaurant(List<CheckboxDTO> filters) { String inputLine; String errors; String result;
findMeareStaturantDao
的类,它包含一些方法,这些方法将在我的活动中使用AsyncTask
内部类对服务器进行网络调用。我的请求后方法有问题,如下所示:
@Override
public String findMeARestaurant(List<CheckboxDTO> filters) {
String inputLine;
String errors;
String result;
try
{
// For each CheckboxDTO, get the Id and add it to JSONArray
JSONArray checkboxJSONArray = new JSONArray();
for (CheckboxDTO checkbox : filters)
{
try
{
// Create JSONObject
JSONObject object = new JSONObject();
// Build the object
object.put("id", checkbox.getId());
// Add object to JSONArray
checkboxJSONArray.put(object);
}
catch (Exception e)
{
e.printStackTrace();
}
}
// Put JSONArray into wrapping JSONObject
JSONObject serverObject = new JSONObject();
try
{
// Create wrapping JSONObject
serverObject.put("filtersIds", checkboxJSONArray);
}
catch (Exception e)
{
e.printStackTrace();
}
// Create URL object to hold URL
URL findMeARestaurantURL = new URL(findMeARestaurantsURL);
// Create connection to server
HttpURLConnection connection = (HttpURLConnection) findMeARestaurantURL.openConnection();
// Set request method and timeouts
connection.setRequestMethod(FIND_RESTAURANT_REQUEST_METHOD);
connection.setRequestProperty("Content-Type", "application/json; utf-8");
connection.setRequestProperty("Accept", "application/json");
connection.setChunkedStreamingMode(0);
connection.setDoOutput(true);
connection.setReadTimeout(READ_TIMEOUT);
connection.setConnectTimeout(CONNECTION_TIMEOUT);
// Connect to server
connection.connect();
// Create Writer
Writer writer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
writer.write(String.valueOf(serverObject));
// Close Writer
writer.close();
// Create InputStreamReader to read response from server
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream(), "utf-8");
// Create BufferedReader to read through InputStream
BufferedReader reader = new BufferedReader(streamReader);
// Create StringBuilder to hold our result
StringBuilder stringBuilder = new StringBuilder();
// Check if the line read is null
while ((inputLine = reader.readLine()) != null){
stringBuilder.append(inputLine);
}
// Close out InputStream and BufferedReader
reader.close();
streamReader.close();
// Set result to stringBuilder
result = stringBuilder.toString();
connection.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
return null;
}
return result;
}
@覆盖
公共字符串FindMeareStarant(列表筛选器){
字符串输入线;
字符串错误;
字符串结果;
尝试
{
//对于每个CheckboxDTO,获取Id并将其添加到JSONArray
JSONArray checkboxJSONArray=新的JSONArray();
for(复选框DTO复选框:过滤器)
{
尝试
{
//创建JSONObject
JSONObject对象=新的JSONObject();
//构建对象
put(“id”,checkbox.getId());
//将对象添加到JSONArray
checkboxJSONArray.put(对象);
}
捕获(例外e)
{
e、 printStackTrace();
}
}
//将JSONArray放入包装JSONObject中
JSONObject serverObject=新的JSONObject();
尝试
{
//创建包装JSONObject
put(“filtersIds”,checkboxJSONArray);
}
捕获(例外e)
{
e、 printStackTrace();
}
//创建URL对象以保存URL
URL FINDMEARESTAURATURL=新URL(FINDMEARESTAURATURL);
//创建到服务器的连接
HttpURLConnection connection=(HttpURLConnection)findMeareStarurantur.openConnection();
//设置请求方法和超时
connection.setRequestMethod(FIND_RESTAURANT_REQUEST_METHOD);
setRequestProperty(“内容类型”、“应用程序/json;utf-8”);
setRequestProperty(“接受”、“应用程序/json”);
connection.setChunkedStreamingMode(0);
connection.setDoOutput(真);
setReadTimeout(读取超时);
connection.setConnectTimeout(连接超时);
//连接到服务器
connection.connect();
//创作作家
Writer Writer=newbufferedwriter(newoutputstreamwriter(connection.getOutputStream());
writer.write(String.valueOf(serverObject));
//亲密作家
writer.close();
//创建InputStreamReader以从服务器读取响应
InputStreamReader streamReader=新的InputStreamReader(connection.getInputStream(),“utf-8”);
//创建BufferedReader以读取InputStream
BufferedReader reader=新的BufferedReader(streamReader);
//创建StringBuilder以保存结果
StringBuilder StringBuilder=新的StringBuilder();
//检查读取的行是否为空
而((inputLine=reader.readLine())!=null){
stringBuilder.append(inputLine);
}
//关闭InputStream和BufferedReader
reader.close();
streamReader.close();
//将结果设置为stringBuilder
结果=stringBuilder.toString();
连接断开();
}
捕获(IOE异常)
{
e、 printStackTrace();
返回null;
}
返回结果;
}
该方法是POST,当我运行应用程序时,它似乎将JSON服务器对象
发送到服务器,但在InputStreamReader
上失败,并返回一个FileNotFoundException
。服务器是由合作伙伴为此项目设置的,并表示API的这一部分应该正常工作。我是不是错过了一些发帖请求?我是否需要做一些不同的事情来读取服务器的响应?任何帮助都将不胜感激 这个问题的解决方案是如何在POST
请求中将数据发送到服务器。在建立连接之前,我必须将过滤器的ID添加到我的URL,从而将其发送到服务器。我修改过的方法遍历每个CheckboxDTO
,捕获Id,然后将其添加到数组中,然后将其添加到URL中:
@Override
public String findMeARestaurant(List<CheckboxDTO> filters) {
String inputLine;
String result;
try
{
// For each CheckboxDTO, get the Id and add it to String Array
int checkboxArray[] = new int[filters.size()];
int i = 0;
for (CheckboxDTO checkbox : filters)
{
try
{
int id = checkbox.getId();
checkboxArray[i] = id;
i++;
}
catch (Exception e)
{
e.printStackTrace();
}
}
// Add filters to end of URL for POST Request
findMeARestaurantsURL += "?filterIds=";
for (i = 0; i < checkboxArray.length; i++)
{
if (i+1 != checkboxArray.length)
{
findMeARestaurantsURL += checkboxArray[i] + ",";
}
else
{
findMeARestaurantsURL += checkboxArray[i];
}
}
// Create URL object to hold URL
URL findMeARestaurantURL = new URL(findMeARestaurantsURL);
// Create connection to server
HttpURLConnection connection = (HttpURLConnection) findMeARestaurantURL.openConnection();
// Set request method and timeouts
connection.setRequestMethod(FIND_RESTAURANT_REQUEST_METHOD);
connection.setRequestProperty("Content-Type", "application/json; utf-8");
connection.setRequestProperty("Accept", "application/json");
connection.setChunkedStreamingMode(0);
connection.setDoOutput(true);
connection.setReadTimeout(READ_TIMEOUT);
connection.setConnectTimeout(CONNECTION_TIMEOUT);
// Connect to server
connection.connect();
// Create InputStreamReader to read response from server
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream(), "utf-8");
// Create BufferedReader to read through InputStream
BufferedReader reader = new BufferedReader(streamReader);
// Create StringBuilder to hold our result
StringBuilder stringBuilder = new StringBuilder();
// Check if the line read is null
while ((inputLine = reader.readLine()) != null){
stringBuilder.append(inputLine);
}
// Close out InputStream and BufferedReader
reader.close();
streamReader.close();
// Set result to stringBuilder
result = stringBuilder.toString();
connection.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
return null;
}
return result;
}
@覆盖
公共字符串FindMeareStarant(列表筛选器){
字符串输入线;
字符串结果;
尝试
{
//对于每个CheckboxDTO,获取Id并将其添加到字符串数组中
int checkboxArray[]=新的int[filters.size()];
int i=0;
for(复选框DTO复选框:过滤器)
{
尝试
{
int id=checkbox.getId();
checkboxArray[i]=id;
i++;
}
捕获(例外e)
{
e、 printStackTrace();
}
}
//将筛选器添加到POST请求的URL结尾
findMeARestaurantsURL+=“?filterIds=”;
对于(i=0;i