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[英]Architecture of client-server applcation when using Java, JPA, HTML5 and REST services
[英]How to handle errors in client-server application using REST services?
題
1)使用REST服務時如何處理客戶端-服務器應用程序中的錯誤? 有人可以幫我提供示例代碼,什么是處理以下代碼中錯誤消息的最佳方法。 例如,在創建服務的情況下,如何在客戶端和/或服務器端捕獲異常?
2)在出現錯誤和成功的情況下,如何將用戶轉發到其他頁面?
客戶
$('#btnSignup').click(function(){
var user = {"id": 10, "firstName": $('#firstName').val(), "lastName": $('#lastName').val(), "age": 69, "freeText": "55555", "weight": 55};
$.ajax({
type: "POST",
contentType: "application/json",
url: "http://localhost:8080/test/webresources/entity.user/",
dataType: "json",
data: JSON.stringify(user),
success: function(response) {
$('#myModal').modal('hide');
},
error: function(data) {
alert('addUser error: ');
}
});
});
REST服務
@Stateless
@Path("entity.user")
public class UsersFacadeREST extends AbstractFacade<Users> {
@PersistenceContext(unitName = "testPU")
private EntityManager em;
public UsersFacadeREST() {
super(Users.class);
}
@POST
@Override
@Consumes({"application/xml", "application/json"})
public void create(Users entity) {
super.create(entity);
}
只需2美分,那么您可以定義一個Result Object,您可以在每次休息電話后返回它
Class Result{
private String statusCode;
private String statusDescription;
}
在豆
@POST
@Override
@Consumes({"application/xml", "application/json"})
@Produces({ "application/json"})
public Result create(Users entity) {
Result result = new Result();
try{
super.create(entity);
result.setStatus("200");
result.setStatusDescriptions("Success");
}catch(Exception) {
result.setStatus("500");
result.setStatusDescriptions("Fail");
}
return result; // Return this as Json
}
您稍后可以使用jquery解析HTML中的響應,並根據“狀態”處理流程
1)在服務器端創建自己的RESTException。
2)每當您回應該異常時; 在HTTP標頭中添加該異常消息。
3)在HTTP協議中,在服務器端使用Exceptions頭中的errorCode && errorMessage並將其在客戶端解碼,以在客戶端顯示有關該異常的有意義的數據。
HTTP Status: 500 - Internal Server Error
Response Headers:
Date=Wed, 09 Jan 2013 13:41:15 GMT
Server=Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8e-fips-rhel5 mod_jk/1.2.28
errorCode=4567
errorMessage=invalid conference passcode
Accept-Charset=big5, big5-hkscs, compound_text, euc-jp, euc-kr, gb18030, gb2312, gbk, ibm-thai, ibm00858, ibm01140, ibm01141, ibm01142, ibm01143, ibm01144, ibm01145, ibm01146, ibm874, x-ibm875, x-ibm921, x-ibm922, x-ibm930, x-ibm933, x-ibm935, x-ibm937, x-ibm939, x- x-windows-50221, x-windows-874, x-windows-949, x-windows-950, x-windows-iso2022jp
Content-Length=6406
Connection=close
Content-Type=application/xml
Response Body:
4567: invalid conference passcode
com.xxx.exceptions.InvalidPasscodeException invalid conference passcode
at com.xxx.dao.impl.context.multipleconfs.ResLessConfDao.validatePasscode(ResLessConfDao.java:754)
at
下面是使用C#客戶端代碼將請求發送到服務器的示例; 這具有錯誤處理機制。
public static bool sendRequest(string requestURL, HTTPRequestMethod requestMethod,
NetworkCredential m_netCred, String xml, ErrorResponse m_objErrorResponse)
{
try
{
HttpWebRequest request = WebRequest.Create(requestURL) as HttpWebRequest;
request.PreAuthenticate = true;
request.Credentials = m_netCred;
request.Method = requestMethod.ToString();
request.AllowAutoRedirect = false;
request.ReadWriteTimeout = 100000;
request.ContentLength = xml.Length;
request.ContentType = "application/xml; encoding='utf-8'";
Debug.WriteLine("XML: {0}", xml);
StreamWriter postStream = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
postStream.Write(xml);
postStream.Close();
WebResponse response = request.GetResponse();
response.Close();
}
catch (WebException webex)
{
var response = webex.Response as HttpWebResponse;
int errCode = 0;
if (response != null)
{
errCode = (int)response.StatusCode;
Debug.WriteLine("HTTP Status Code: " + (int)response.StatusCode);
if ((int)response.StatusCode != 500) //Other errors
{
m_objErrorResponse.UpdateErrorResponse(errCode.ToString(), response.StatusCode.ToString(), "");
}
else
{
m_objErrorResponse.UpdateErrorResponse(errCode.ToString(), response.StatusCode.ToString(),
response.Headers.ToString().Split('\n')[1].Substring(14).Trim());
}
}
return false;
}
return true;
}
}
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