对 Spring MVC 控制器的 Java HTTP POST 请求

Question

我有一个带有以下方法定义的 Spring MVC 控制器：

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

我需要通过生成POST HTTP 请求，从 Java 程序向该控制器发送数据。

我尝试了以下代码：

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();

Java 代码未能到达控制器。 假设我的 Web 项目是“WebApp”，我使用的 URL 是否正确？

• 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

现在可以了。 我不确定是什么导致了之前的问题。