Adding query parameters to URL on HTTP request

Question

I was looking at a few post regrading query parameters in my URL and I couldn't quite find what I was looking for.

So far the external API I am fetching data from requires a specific I will call in this case "tag" parameter when making HTTP request in the browser.

Here is my Post model with a tag defined as a field

package com.example.blog.post;

import javax.persistence.*;

@Entity
@Table(name = "post")
public class Post{

    @Id
    @GeneratedValue
    private Long id;


    private String tag;

    public Post() {

    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getId() {

        return id;
    }

    public String getTag() {
        return tag;
    }
}

And here is my controller class and the "getPosts()" method is where I am fetching the external data but it requires a tag parameter (query parameter) in order to complete the response. How do I incorporate the "tag" query parameter in this case?

package com.example.blog.post;

import org.springframework.web.bind.annotation.*;
import java.util.*;
import org.springframework.http.*;
import org.springframework.web.client.RestTemplate;
import com.example.blog.HttpRequest;

@RestController
@RequestMapping
public class PostController {

    private PostRepository postRepository;

    private RestTemplate restTemplate;

//    @GetMapping("/api/ping")
//    public ResponseEntity<?> ping(){
//        String res = request.body();
//        return new ResponseEntity<>(res,HttpStatus.OK);
//    }



    @GetMapping("/api/posts")
    public ResponseEntity<?> getPosts(@RequestParam(value="tag") String tag){
        try{
            HttpRequest request = HttpRequest.get("https://api.blogs.io/blog/posts").connectTimeout(12000);
            String res = request.body();
            return new ResponseEntity<>(res,HttpStatus.OK);
        }catch (Exception e){
            e.printStackTrace();
            return new ResponseEntity<>("Error!,please try again",HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }
}

Geeth · Accepted Answer · 2022-02-08 07:56:37Z

2

The tag request parameter should be sent to the url. And your getPosts() method tag parameter should be correct as follows.

getPosts(@RequestParam String tag)

value field is used in @RequestAttribute

answered Feb 8, 2022 at 7:56

Geeth

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Comments

Yogesh Sharma · Accepted Answer · 2022-02-08 09:25:47Z

1

Simply change your method to

@GetMapping("/api/posts")
public ResponseEntity<?> getPosts(@RequestParam("tag") String tag){...}

Then you also need to send that query param in url like

http://localhost:8080/api/posts?tag=java

answered Feb 8, 2022 at 9:25

Yogesh Sharma

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1 Comment

Geeth Over a year ago

Also can be like this . public ResponseEntity<?> getPosts(@RequestParam String tag){...}

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