I have recently started working with Spring MVC framework. I made a lot of progress while reading lots of tutorial on the net.
Background about my application-
I have to make a REST URL call to another service (deployed already on tomcat) by using details provided in the form. So I have already made a form using JSP whose content is something like this as shown in the picture- I am not sure how can I make a REST url call by making the url from the form entries and then show the response of that url on the next screen.
So in the above form if I have written User Id as 1000012848 , and checkbox is selected (means true) for Debug Flag and in the Attribute Name I have selected first row ( in general we can select all three as well) and Machine Name is localhost and Port Number is 8080 then url should look something like this-
http://localhost:8080/service/newservice/v1/get/PP.USERID=1000012848,debugflag=true/host.profile.ACCOUNT
So in all our URL that we will be making from the form entries, the below line will always be there at the same place- and then after that each form entry will start getting appended
service/newservice/v1/get/
Now after making the above url, as soon as I will be clicking submit, it will be making a call to the above url and whatever response it gets from the URL, it will show in the next screen (result.jsp file) which I am not sure how to do that? Below are my files which I have created. Can anyone help me out in solving my problem? What code changes I will be needing to do this problem?
student.jsp file (which makes the form)
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<res:head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="layout" content="main" />
<title>First Tutorial</title>
</res:head>
<res:body>
<form:form method="POST" action="/_hostnewapp/addStudent">
<table>
<tr>
<td><form:label path="userId">User Id</form:label></td>
<td><form:input path="userId" /></td>
</tr>
<tr>
<td>Debug Flag :</td>
<td><form:checkbox path="debugFlag" /></td>
</tr>
<tr>
<td>Attribute Name</td>
<td><form:select path="attributeNames" items="${attributeNamesList}"
multiple="true" /></td>
</tr>
<!-- <tr>
<td>Environment</td>
<td><form:checkboxes items="${environmentList}"
path="environments" /></td>
</tr>
-->
<tr>
<td><form:label path="machineName">Machine Name</form:label></td>
<td><form:input path="machineName" /></td>
</tr>
<tr>
<td><form:label path="portNumber">Port Number</form:label></td>
<td><form:input path="portNumber" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Submit" /></td>
</tr>
</table>
</form:form>
</res:body>
</html>
result.jsp file (which I am going to use to show the result after hitting that url)
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<res:head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="layout" content="main" />
<title>HostDomain</title>
</res:head>
<res:body>
<h2>Response after submitting the result</h2>
// Not sure what I need to add here to show the result after hitting the url
</res:body>
</html>
Controller Class-
@Controller
public class SampleRaptorController {
@RequestMapping(value = "/student", method = RequestMethod.GET)
public ModelAndView student() {
return new ModelAndView("student", "command", new Student());
}
@RequestMapping(value = "/addStudent", method = RequestMethod.POST)
public String addStudent(@ModelAttribute("SpringWeb") Student student,
ModelMap model) {
model.addAttribute("userId", student.getUserId());
return "result";
}
@ModelAttribute("attributeNamesList")
public Map<String,String> populateSkillList() {
//Data referencing for java skills list box
Map<String,String> attributeNamesList = new LinkedHashMap<String,String>();
attributeNamesList.put("ACCOUNT","host.profile.ACC");
attributeNamesList.put("ADVERTISING","host.profile.ADV");
attributeNamesList.put("SEGMENTATION","host.profile.SEG");
return attributeNamesList;
}
}
You can to use RestTemplate for calling RESTful URLs from your spring component
So, Your controller method can be as below
@Controller
public class SampleRaptorController {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/addStudent", method = RequestMethod.POST)
public String addStudent( @ModelAttribute("SpringWeb") Student student,
Model model){
// Build URL
StringBuilder url = new StringBuilder().
append("http://localhost:8080/service/newservice/v1/get").
append("?PP.USERID=" + student.getUserId).
append("&debugflag=" + student.isDebugFlag);// so on
// Call service
String result = restTemplate.getForObject(url.toString(), String.class);
model.addAttribute("result", result);
return "result";
}
}
Your spring configuration should register the restTemplate as below:
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"/>
See RestTemplate doc for more details.
The above should do.
One suggestion.. Your RESTful URL (http://localhost:8080/service/newservice/v1/get/PP.USERID=1000012848, debugflag=true/host.profile.ACCOUNT) is really terrible. Once you resolve your problem, I recommend you to google for how a good RESTful URL shuld look like.
Cheers, Vinay
来源：https://stackoverflow.com/questions/14432167/make-a-rest-url-call-to-another-service-by-filling-the-details-from-the-form