对Spring MVC Controller的Java HTTP POST请求

Question

I have a Spring MVC Controller with the following method definition:

@RequestMapping(value="SaveReading.htm",method=RequestMethod.POST)
protected void saveReading(Reading reading) throws ServletException, IOException {
    logger.debug("Received reading for id: " + reading.getMonitorId());
}

I need to send data to this controller from a Java program, by producing a POST HTTP request.

I tried the following code:

try {

    url = new URL("http://localhost:8080/WebApp/SaveReading.htm");
} catch (MalformedURLException e) {
    logger.error("Malformed URL ", e);
    return;
}
try {
    conn = (HttpURLConnection)url.openConnection();
    logger.debug("Opened Connection. " + conn.getURL());
    conn.setDoOutput(true);
    conn.setUseCaches(false);
    conn.setRequestMethod("POST");
    conn.connect();

    writer = new OutputStreamWriter(conn.getOutputStream());        
} catch (IOException e) {
    logger.error("Error setting up URL connection: ", e);
}

String data = "";
try {
    data = URLEncoder.encode("monitorId", "UTF-8") + "=" + URLEncoder.encode(id, "UTF-8");
    data += "&" + URLEncoder.encode("timeStamp", "UTF-8") + "=" + URLEncoder.encode(""+new Date().getTime(), "UTF-8");
} catch (UnsupportedEncodingException e) {
    logger.error("Encoding problem ", e);
}
System.out.println("Sending HTTP message: \n" + data);
// Send data
try {
    writer.write(data);
    writer.flush();

The Java code failed to reach the controller. Is the URL I'm using is the correct one, assuming that my web project is "WebApp"?

• web.xml :

   <display-name>Web Application</display-name> <servlet> <servlet-name>ReadingsServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>ReadingsServlet</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/ReadingsServlet-servlet.xml </param-value> </context-param> 

• ReadingsServlet-servlet.xml :

   <context:annotation-config /> <context:component-scan base-package="com.myapp.familycare"/> <context:component-scan base-package="miscillaneous.property_placeholder" /> <mvc:annotation-driven /> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> 

Answer 1

It does work now. I'm not sure what caused the problem before.