how to configure ViewResolver for concrete controller

how to configure ViewResolver for concrete controller - java

I have spring mvc application. I have 2 controllers -
first uses standart view resolver and render to jsp
second uses resolver for creatin RestFull wev service
How I can configure it?
UPDATE
first controller
#Controller
#RequestMapping("/controllerPath")
public class MyController {
#RequestMapping("/sayHello")
public String sayHello(Model model){
model.addAttribute("name", "Vasya");
return "hello";
}
}
it uses
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
I need to add one more controller which will work as restful webservice and return json to client

You can do a RESTful handler by simply having the Jackson libraries in your classpath and returning the object you want to serialize to JSON, or by using the #ResponseBody annotation to indicate that your returned object should be used as the "body" of the HTTP response directly.
Using Jackson
#RequestMapping("/myRestful")
MyDomainObject myRestfulService() {
// .. do some stuff... //
return new MyDomainObject(); // <- Return some object
}
Using #ResponseBody:
#RequestMapping("/myRestful")
#ResponseBody String myRestfulService() {
// .. do some stuff... //
return new "This is some string that will be returned, as-is, to the client"; // <- Return some data
}
Hope that helps

Related

How to access Model Attribute's value and set to ModelAndView

I cant seem to find the solution for this.
I have method that returns ModelAndView to view web pages.
I store a webpage filename to model whenever a condition is true.
Example:
#RequestMapping(value = "/process", method = RequestMethod.POST)
public ModelAndView processRequest(HttpServletRequest request,
HttpServletRequest response, Model model,#RequestParam("file") MultipartFile file)
throws IOException {
if (file.isEmpty()) {
model.addAttribute("exception", "web_file1")
} else {
model.addAttribute("exception", "web_file2")
}
How can I retrieve the data stored in "exception" and set it to ModelAndView?
ModelAndView mav = new ModelAndView();
mav.setViewName("exception");
//expected:web_file2
//actual:exception
return mav;

model.addAttribute("exception", "web_file2")
String sModel=model.toString(); //{exception=web_file2}
String returnView = (sModel).substring(11,sModel.length()-1); //web_file2
return new ModelAndView(returnView);
I've found a way to get it,
But I think there's a better way to do this.

1. put your data using
mv.addObject("exception","web_file1");
in your view retrieve data by the key ie exception ${exception}
eg : <input type="text" value="${exception}" />
2. if used spring mvc with jsp/html Ensure you have declared a bean for viewResolver
which has following format
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>abc.jsp</value>
</property>
</bean>

I am using #PathVariable from springframework. When I try to return view page name from controller, I get 404 error

I am using spring mvc(version:4.1.5.RELEASE). I have added new controller in my project and trying to use #PathVariable annotation. As I add this annotation I get 404 error of my jsp template view page. If I remove #PathVariable annotation and {id} from #RequestMapping path, code works properly. Can someone please help me whats wrong?
dispatcher-servlet.xml
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
my new controller
#Controller
public class MoviesController {
#RequestMapping(value = "/movie/{id}", method=RequestMethod.GET)
public String moviesDetails(#PathVariable(value="id")
String id, ModelMap map) {
System.out.println(id);
map.addAttribute("movieId", id);
return "moviesDetails";
}
}
link where i am adding id is like below.
a href="movie/${movie.id}">${movie.movieName}
HTTP Status 404 - /shcm/movie/WEB-INF/views/moviesDetails.jsp
moviesDetails.jsp file already exists in WEB-INF/views path

Change in controller :
#GetMapping("/movie/{id}")
public String moviesDetails(#PathVariable
String id, ModelMap map) {
System.out.println(id);
map.addAttribute("movieId", id);
return "moviesDetails";
}
And in web.xml :
<property name="prefix" value="/WEB-INF/views/"></property>

Change
#PathVariable(value="id") String id
to
#PathVariable("id") String id

Spring MVC rendering 404 due to wrong view

I'm debugging a controller method in Spring MVC that should return a view, but I'm getting a 404 page.
Error
HTTP Status 404
/WEB-INF/views/responsive/pages/company/myCompanyCreatePurchaseOrderPage.jsp
The view is actually located in
/WEB-INF/views/pages/company/myCompanyCreatePurchaseOrderPage.jsp
Code
#RequestMapping(method = RequestMethod.GET, value = "/admin/getPoNumbers", produces = "application/json")
protected String getPurchaseOrdersFromSettings(#RequestParam(value = "uid")
final String uid, final Model model, final HttpServletRequest request, final RedirectAttributes redirectAttributes) {
// unrelated code omitted
return "pages/company/myCompanyCreatePurchaseOrderPage";
}
Where does this prefix get set?

InternalResourceViewResolver bean on your web.xml or applicationContext.xml
Sample
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass">
<value>org.springframework.web.servlet.view.JstlView</value>
</property>
<property name="prefix">
<value>/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>

Passing JSON Map into Spring MVC Controller

I'm trying to send a JSON representation of a Map into my controller as a POST parameter.
#RequestMapping(value = "/search.do", method = RequestMethod.GET, consumes = { "application/json" })
public #ResponseBody Results search(#RequestParam("filters") HashMap<String,String> filters, HttpServletRequest request) {
//do stuff
}
I found that #RequestParam would just throw a 500 error, so I tried using #ModelAttribute instead.
#RequestMapping(value = "/search.do", method = RequestMethod.GET, consumes = { "application/json" })
public #ResponseBody Results search(#ModelAttribute("filters") HashMap<String,String> filters, HttpServletRequest request) {
//do stuff
}
This would correctly respond to requests, but I realized that the Map was empty. With later experimentation, I found that any object (not just HashMap) would be instantiated, but no fields would be filled in. I do have Jackson on my classpath, and my controllers will respond with JSON. However, it would appear that my current configuration is not allowing Spring to read JSON in via a GET/POST parameter.
How does one pass JSON representations of objects from a client-side AJAX request to a Spring controller as a request parameter and get a Java object out?
EDIT Adding my relevant Spring configuration
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html" />
<entry key="json" value="application/json" />
</map>
</property>
<property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</list>
</property>
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<property name="prefixJson" value="true" />
</bean>
</list>
</property>
</bean>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
</list>
</property>
</bean>
On the suggestion of a commenter, I tried #RequestBody. This will work, so long as the JSON strings are quoted with double quotes.
#RequestMapping(value = "/search.do", method = RequestMethod.POST, consumes = { "application/json" })
public #ResponseBody Results<T> search(#RequestBody HashMap<String,String> filters, HttpServletRequest request) {
//do stuff
}
This does solve my immediate issue, but I'm still curious as to how ou might pass in multiple JSON objects via an AJAX call.

This does solve my immediate issue, but I'm still curious as to how ou might pass in multiple JSON objects via an AJAX call.
The best way to do this is to have a wrapper object that contains the two (or multiple) objects you want to pass. You then construct your JSON object as an array of the two objects i.e.
[
{
"name" : "object1",
"prop1" : "foo",
"prop2" : "bar"
},
{
"name" : "object2",
"prop1" : "hello",
"prop2" : "world"
}
]
Then in your controller method you recieve the request body as a single object and extract the two contained objects. i.e:
#RequestMapping(value="/handlePost", method = RequestMethod.POST,
consumes = { "application/json" })
public void doPost(#RequestBody WrapperObject wrapperObj) {
Object obj1 = wrapperObj.getObj1;
Object obj2 = wrapperObj.getObj2;
//Do what you want with the objects...
}
The wrapper object would look something like...
public class WrapperObject {
private Object obj1;
private Object obj2;
public Object getObj1() {
return obj1;
}
public void setObj1(Object obj1) {
this.obj1 = obj1;
}
public Object getObj2() {
return obj2;
}
public void setObj2(Object obj2) {
this.obj2 = obj2;
}
}

You may use the Jackson library to convert from Json to Map.
#web-context.xml
<bean id="messageAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</list>
</property>
</bean>
#maven dependencies:
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-lgpl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-lgpl</artifactId>
<version>1.9.13</version>
</dependency>
#Controller
#RequestMapping(value = "/method", method = RequestMethod.DELETE)
public String method(
#RequestBody Map<String, Object> obj){
#Request (e.g. jquery Ajax)
$.ajax({"type": "DELETE",
"contentType": "application/json;",
"url": "/method",
"data": JSON.stringify({"key": "Ricardo"}),
"dataType": "json";}
});
It's much easier with Python Frameworks or Play! ufff

I have passed the Map object to Java using below code :
Javascript Code :
var values = {
"object1" : JSON.stringify(object1),
"object2" : JSON.stringify(object2)
};
var response = $http.post(url,data);
Server Side Code :
#RequestMapping(value = "/deleteData",method = RequestMethod.POST,consumes = MediaType.APPLICATION_JSON_VALUE)
#ResponseBody
public Result deleteData(#RequestBody HashMap<String, Object> dataHashMap) {
Object1 object1= (Object1) JsonConvertor.jsonToObject((String) dataHashMap.get("object1"), Object1.class);
Object2 object2= (Object2) JsonConvertor.jsonToObject((String) dataHashMap.get("object2"), Object2.class);
}
JsonConvertor Class :
public class JsonConvertor {
public static <T> Object jsonToObject(String json, Class<T> clazz) {
if (json == null)
throw new IllegalArgumentException("null cannot be converted to Object");
Gson gson = new GsonBuilder().disableHtmlEscaping().setDateFormat("dd-MMM-yyyy").create();
return gson.fromJson(json, clazz);
}
}

You are not getting json correctly.
Do like that ....
/*
* Mapping for Demographics And Profiling Question Filter
*/
#RequestMapping (value = "/generalFilter")
public void ageFilteration(#RequestParam Map <String,String> filterParams,HttpServletRequest request,HttpServletResponse response) throws IOException
{
// System.out.println("Geographies in Controller :"+ filterParams.get("geographies"));
List<FeasibilityBean> feasibilityList = feasibilityDao.getGeneralFeasibilityList(filterParams,request);
// System.out.println(" General Filter List Size:"+feasibilityList.size());
response.getWriter().print(new Gson().toJsonTree(feasibilityList,new TypeToken<List<FeasibilityBean>>(){}.getType()));
}
}
Js Code
var ages='',ageCond='',genders='',genderCond='';
$.ajax({
type: "POST",
url : url,
data : {ages:ages,ageCond:ageCond,genders:genders,genderCond:genderCond},
beforeSend: function() {
$(thisVar).find('i').addClass('fa-spin');
},
success : function(feasibilityJson){
},
error : function(data) {
alert(data + "error");
},
complete:function(){
$(thisVar).find('i').removeClass('fa-spin');
}
});
or you want to bind bean with json....
https://stackoverflow.com/a/21689084/5150781
https://stackoverflow.com/a/37958883/5150781

#RequestMapping(method = RequestMethod.POST)
public HttpEntity<Resource<Customize>> customize(#RequestBody String customizeRequest) throws IOException {
Map<String, String> map = mapper.readValue(customizeRequest, new TypeReference<Map<String,String>>(){});
log.info("JSONX: " + customizeRequest);
Long projectId_L = Long.parseLong(map.get("projectId"));
[...]

As #dario's answer, but for Jackson 2 version:
spring-web-context.xml
<bean id="messageAdapter" class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" >
<property name="supportedMediaTypes">
<list>
<value>application/json;charset=utf-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean>
maven pom.xml:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.6</version>
</dependency>
java controller
#RequestMapping(value = "/search.do", method = RequestMethod.GET, consumes = { "application/json" })
public #ResponseBody Results search(#RequestBody Map<String,Object> filters, HttpServletRequest request) {

Change Name of a .JSP file

I am developing a simple spring application. I have a few jsps and I would like to change the name and the URL of a jsp. I changed the controller:
#RequestMapping(value = "/simpleForm.html", method = RequestMethod.GET)
public void simpleForm(Model model) {
model.addAttribute(new User());
}
to
#RequestMapping(value = "/newName.html", method = RequestMethod.GET)
public void simpleForm(Model model) {
model.addAttribute(new User());
}
and the name of the old simpleForm.jsp to newName.jsp user is a class I use in the form in simpleform.jsp
I couldn't make it work. I am getting 404 that simpleform.jsp is not found. I am pretty stuck.
Edit: My view resolver tags:
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
My url pattern is like:
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/forms/*</url-pattern>
</servlet-mapping>
I've found out that all of the links are getting the same error ()
resource not available. Even the ones that I didn't change the name
of.
I also tried directly starting from newName.jsp. Still the same error!

change:
#RequestMapping(value = "/newName.html", method = RequestMethod.GET)
to:
#RequestMapping(value = "/newName.jsp", method = RequestMethod.GET)

Double-check you still have the #Controller annotation on the class. I've seen 404s when has been accidentally deleted.

Try changing it to
#RequestMapping(value = "/newName.html", method = RequestMethod.GET)
public String simpleForm(Model model) {
model.addAttribute(new User());
return "newName"; // returning the desired view
}
And make sure you have defined viewResolver accordingly like
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
Change prefix as per your application structure.It will take the view (String returned by controller) and will add prefix and suffix. So the view resolved will be /WEB-INF/jsp/newName.jsp.

A 404 error is an HTTP status code that means that the page you were trying to reach on a website couldn't be found on their server.
As I can see, your suffix is .jsp. So try this (if there is any newName.jsp in the WebContent)
#RequestMapping(value = "/newName", method = RequestMethod.GET)
public void simpleForm(Model model) {
model.addAttribute(new User());
}

It should work
If you try this URL
http://localhost:<port>/AppNAme/forms/newName.html
and your controller is
#RequestMapping(value = "/newName.html", method = RequestMethod.GET)
public ModelAndView simpleForm(Model model) {
model.addAttribute(new User());
ModelAndView mv = new ModelAndView("jspViewName");
return mv;
}

The forward slash is missing in the prefix of your ViewResolver. This should fix your 404. Give it a shot.
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>

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how to configure ViewResolver for concrete controller - java

Related

How to access Model Attribute's value and set to ModelAndView

I am using #PathVariable from springframework. When I try to return view page name from controller, I get 404 error

Spring MVC rendering 404 due to wrong view

Passing JSON Map into Spring MVC Controller

Change Name of a .JSP file

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