我有一个java RESTFUL webservice，它通过HTTP POST从我的角度前端获取一个json数组。 json数组是在一个表单中动态创建的，当你单击一个按钮向表单添加更多行时，奇怪的是如果我提交1行它工作正常并将信息添加到我的数据库，但当我尝试2行或更多我得到500错误。也许我的FOR循环迭代json数组不是应该的样子？
HTTP POST
postNeuromotora(params){
let headers = new Headers();
headers.append('Content-type','application/json');
return this.http.post(`${this.api}neuromotora/`,params,{
headers: headers
}).map(
(res:Response) => {return res.json();}
);
}
通过http发送的json输出是
"[ { "pacienteid": 4, "nervonome": "Mediano", "ladonervo": "Direito", "latencia": "2", "amplitudedistal": "1", "amplitudeprox": "321", "velocidade": "321", "ondaf": "4" }, { "pacienteid": 4, "nervonome": "Ulnar", "ladonervo": "Esquerdo", "latencia": "3", "amplitudedistal": "2", "amplitudeprox": "321", "velocidade": "312", "ondaf": "66" }]"
Neuromotora java文件＆gt;
public class Neuromotora {
private int neuromotoraid;
private String latencia;
private String amplitudedistal;
private String amplitudeprox;
private String nervonome;
private String ladonervo;
private String velocidade;
private String ondaf;
private int pacienteid;
}
在neuromotoraDAO中插入方法
public void insert(List<Neuromotora> list) throws SQLException, ClassNotFoundException{
Long id = null;
for(Neuromotora n: list ){
String sqlQuery = "INSERT INTO neuromotora(nervonome,latencia,amplitudedistal,amplitudeprox,velocidade,ondaf,pacienteid,ladonervo)"
+ " VALUES(?,?,?,?,?,?,?,?)";
PreparedStatement stmt = this.con.getConnection().prepareStatement(sqlQuery);
stmt.setString(1,n.getNervonome());
stmt.setString(2,n.getLatencia());
stmt.setString(3,n.getAmplitudedistal());
stmt.setString(4,n.getAmplitudeprox());
stmt.setString(5,n.getVelocidade());
stmt.setString(6,n.getOndaf());
stmt.setInt(7,n.getPacienteid());
stmt.setString(8,n.getLadonervo());
ResultSet rs = stmt.executeQuery();
this.con.commit();
}
}
我的java控制器上的POST方法
@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces({MediaType.APPLICATION_JSON})
@Path("/neuromotora/")
public Response createNeuromotora(List<Neuromotora> n) throws SQLException, ClassNotFoundException{
neuromotoraDAO dao = new neuromotoraDAO();
dao.insert(n);
return Response
.status(200)
.header("Access-Control-Allow-Origin", "*")
.header("Access-Control-Allow-Headers", "origin, content-type, accept, authorization")
.header("Access-Control-Allow-Credentials", "true")
.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD")
.header("Access-Control-Max-Age", "1209600")
.entity(n)
.build();
}
tomcat日志的Stactrace
03-Nov-2017 08:51:04.620 SEVERE [http-nio-8080-exec-348] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [io.github.dggodoi.aprendendo.java.backend.MyApplication] in context with path [/aprendendo-java-backend] threw exception [org.glassfish.jersey.server.ContainerException: org.postgresql.util.PSQLException: No results were returned by the query.] with root cause
org.postgresql.util.PSQLException: No results were returned by the query.
at org.postgresql.jdbc.PgPreparedStatement.executeQuery(PgPreparedStatement.java:117)
at io.github.dggodoi.aprendendo.java.data.neuromotoraDAO.insert(neuromotoraDAO.java:45)
at io.github.dggodoi.aprendendo.java.backend.controllers.ChamadoController.createNeuromotora(ChamadoController.java:172)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:148)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:191)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:200)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:103)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268)
at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
at org.glassfish.jersey.internal.Errors.process(Errors.java:268)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703)
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:416)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:370)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:198)
at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:244)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
答案 0 :(得分：0)
似乎我必须使用executeUpdate而不是查询，并且con.commit（）也不能在for循环中，它在执行查询后关闭。现在它有效！谢谢