Java – Spring MVC – How to get all request params in a map in Spring controller

javaspringspring-mvc

Sample URL:

../search/?attr1=value1&attr2=value2&attr4=value4

I do not know the names of attr1, att2, and attr4.

I would like to be able to do something like that (or similar, don't care, just as long as I have access to the Map of request param name -> value:

@RequestMapping(value = "/search/{parameters}", method = RequestMethod.GET)
public void search(HttpServletRequest request, 
@PathVariable Map<String,String> allRequestParams, ModelMap model)
throws Exception {//TODO: implement}

How can I achieve this with Spring MVC?

Best Answer

While the other answers are correct it certainly is not the "Spring way" to use the HttpServletRequest object directly. The answer is actually quite simple and what you would expect if you're familiar with Spring MVC.

@RequestMapping(value = {"/search/", "/search"}, method = RequestMethod.GET)
public String search(
@RequestParam Map<String,String> allRequestParams, ModelMap model) {
   return "viewName";
}

Related Solutions

Java – How to efficiently iterate over each entry in a Java Map

Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

On Java 10+:

for (var entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

Java – How to initialise a static Map

The instance initialiser is just syntactic sugar in this case, right? I don't see why you need an extra anonymous class just to initialize. And it won't work if the class being created is final.

You can create an immutable map using a static initialiser too:

public class Test {
    private static final Map<Integer, String> myMap;
    static {
        Map<Integer, String> aMap = ....;
        aMap.put(1, "one");
        aMap.put(2, "two");
        myMap = Collections.unmodifiableMap(aMap);
    }
}

Best Answer

Related Solutions

Java – How to efficiently iterate over each entry in a Java Map

Java – How to initialise a static Map

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