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[英]Angular 4 http POST request to java Spring Controller
[英]Java HTTP POST request to Spring MVC Controller
我有一個具有以下方法定義的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());
}
我需要通過產生POST
HTTP請求將數據從Java程序發送到此控制器。
我嘗試了以下代碼:
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代碼無法到達控制器。 假設我的Web項目是“ WebApp”,我使用的URL是否正確?
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>
現在可以正常工作。 我不確定以前是什么引起了問題。
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