How to pass Hasmap from Html to Spring controller in java

Question

How to pass Hasmap from Html to Spring controller in java.And also I would like to know how to get it from the controller.

@Soorapadman I just tried to pass it as a normal variable and I could see the map values in the url. but in the controller i couldnt get it. — dona devasia, Oct 14 '15 at 08:37
http://viralpatel.net/blogs/spring-mvc-hashmap-form-example/ try this :) :) — Bilbo Baggins, Oct 14 '15 at 08:38
and this too ... http://stackoverflow.com/questions/18280395/passing-a-mapstring-string-to-a-springmvc-controller — Bilbo Baggins, Oct 14 '15 at 08:38

score 0 · Answer 1 · answered Oct 14 '15 at 08:43

0

First of all there is nothing like passing hashmap from html to Spring controller. What you want to accomplish is actually making a http request to web application.

Create a form model which has Map<String,String> as class variable with appropriate setter and getter.

Then in your action;

  public @ResponseBody String formPost(@ModelAttribute YourFormClass form, HttpServletRequest request) {
      //Rest of your business logic
  }

answered Oct 14 '15 at 08:43

Fatih Donmez

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Thanks.let me try to follow your method. – dona devasia Oct 14 '15 at 09:04

score 0 · Answer 2 · answered Feb 20 '23 at 18:40

I guess this will help you.

HTML:

<html><body>
<input type="hidden" name="Hashmap" id="mymap">
</body>
<script>
var Map = new Map(); //push some values into this
var obj = Object.fromEntries(keyvalue);
        var StringKeyvalue = JSON.stringify(obj);
        console.log("entra babu nak idhi: ",StringKeyvalue)
        document.getElementById("mymap").value = StringKeyvalue;
</script>
</html>

Controller:

public String passingHashmap(HttpServletRequest request,@RequestParam("Hashmap") 
String mapValues) {
    ObjectMapper mapper = new ObjectMapper();
    try {
        Map<String, String> myHashMap = mapper.readValue(mapValues, new 
TypeReference<HashMap<String, String>>(){});
} catch (JsonProcessingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
return true;
}

How to pass Hasmap from Html to Spring controller in java

2 Answers2