Spring boot UriComponentsBuilder 中文亂碼 解決

在SpringBoot使用RestTemplate發送請求，並且使用UriComponentsBuilder來組Params時會出現中文亂碼，一開始誤以為是沒有UTF-8，但其實不是

因為在使用UriComponentsBuilder組參數網址的時候會進行編碼，然後在RestTemplate又會再編碼一次

因為重複編碼然後解碼的時候只解一次，所以中文會變成亂碼

解決方式就是告訴他不要再編碼

不要用：

builder.toUriString()

而是：

builder.build(false).toUriString()

下面有使用範例

能夠不出現中文亂碼的程式碼：

private static final java.util.logging.Logger logger = Logger.getLogger(LockController.class.getName());

@GetMapping("/test")
public int test() {

    Member req = new Member();
    String url = "http://127.0.0.1:5555/test";
    RestTemplate restTemplate = new RestTemplate();
    HttpHeaders headers = new HttpHeaders();
    headers.set(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);
    UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url)
            .queryParam("id", req.id)
            .queryParam("name", req.name)
            .queryParam("description", req.description);

    HttpEntity<?> entity = new HttpEntity<>(headers);
    //假設回傳的也是Member
    HttpEntity<Member> response = restTemplate.exchange(builder.build(false).toUriString(), HttpMethod.PUT, entity, Member.class);//告訴他不要再編碼
    Member res = response.getBody();

    return HttpServletResponse.SC_OK;
}

class Member {
    String id = "id";
    String name = "名稱";
    String description = "說明";
}

測試過程：

    private static final java.util.logging.Logger logger = Logger.getLogger(Controller.class.getName());

    @GetMapping("/test")
    public int test() {

        Member req = new Member();
        String url = "http://127.0.0.1:5555/test";
        RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        headers.set(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);
        UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url)
                .queryParam("id", req.id)
                .queryParam("name", req.name)
                .queryParam("description", req.description);

        //手動組參數測試
        url += "?id=" + req.id +
                "&name=" + req.name +
                "&description=" + req.description;

        logger.info("builder.toString(): " + builder.toString());//回傳"org.springframework.web.util.UriComponentsBuilder@4124a5e7" 用都不能用
        logger.info("builder.toUriString(): " + builder.toUriString());//重複編碼
        logger.info("builder.build(true).toUriString(): " + builder.build(false).toUriString());//告訴他不要編碼
        logger.info("url: " + url);//手動組參數

        /**log如下：*/
        //builder.toString(): org.springframework.web.util.UriComponentsBuilder@78f2cd36
        //builder.toUriString(): http://127.0.0.1:5555/test?id=id&name=%E5%90%8D%E7%A8%B1&description=%E8%AA%AA%E6%98%8E
        //builder.build(true).toUriString(): http://127.0.0.1:5555/test?id=id&name=名稱&description=說明
        //url: http://127.0.0.1:5555/test?id=id&name=名稱&description=說明

        HttpEntity<?> entity = new HttpEntity<>(headers);

        //假設回傳的也是Member
        HttpEntity<Member> response = restTemplate.exchange(builder.build(false).toUriString(), HttpMethod.PUT, entity, Member.class);//告訴他不要再編碼 成功
//            HttpEntity<Member> response = restTemplate.exchange(builder.toUriString(), HttpMethod.PUT, entity, Member.class);//預設會自動編碼
//            HttpEntity<Member> response = restTemplate.exchange(builder.toString(), HttpMethod.PUT, entity, Member.class);//回傳"org.springframework.web.util.UriComponentsBuilder@4124a5e7" 用都不能用
//            HttpEntity<Member> response = restTemplate.exchange(url, HttpMethod.PUT, entity, Member.class);//手動組參數 成功


        Member res = response.getBody();

        return HttpServletResponse.SC_OK;
    }

    class Member {
        String id = "id";
        String name = "名稱";
        String description = "說明";
    }