RestTemplate 简单使用（笔记）

清疚 2022-11-27 00:41 185阅读 0赞

**get**

public static void get(){
            RestTemplate restTemplate = new RestTemplate();
    
            //不带参数get
            Notice notice = restTemplate.getForObject("http://localhost:8088/rest/notice",Notice.class);
            System.out.println(notice.toString());
    
            //带参数get (占位符)
            notice = restTemplate.getForObject("http://localhost:8088/rest/{1}/{2}",Notice.class,"hello",5);
            System.out.println(notice.toString());
    
            //带参数get (map)
            Map<String,String> map = new HashMap();
            map.put("start1","6");
            map.put("page2","5");
    
            notice = restTemplate.getForObject("http://localhost:8088/rest/page?start={start1}&page={page2}",Notice.class,map);
            System.out.println(notice.toString());
        }
    
        /**
         * 只是返回参数和get不一样
         */
        public static void entity(){
            RestTemplate restTemplate = new RestTemplate();
    
            //不带参数get
            ResponseEntity<Notice> notice = restTemplate.getForEntity("http://localhost:8088/rest/notice",Notice.class);
            System.out.println(notice.getBody().toString());
    
            //带参数get (占位符)
            notice = restTemplate.getForEntity("http://localhost:8088/rest/{1}/{2}",Notice.class,"hello",5);
            System.out.println(notice.getBody().toString());
    
            //带参数get (map)
            Map<String,String> map = new HashMap();
            map.put("start1","6");
            map.put("page2","5");
    
            notice = restTemplate.getForEntity("http://localhost:8088/rest/page?start={start1}&page={page2}",Notice.class,map);
            System.out.println(notice.getBody().toString());
        }

**post**

/**
         * post
         */
        public static void post(){
            RestTemplate restTemplate = new RestTemplate();
    
            MultiValueMap<String, String> requestMap= new LinkedMultiValueMap<String, String>();
            requestMap.add("client_id", "123");
            requestMap.add("app_code", "abc");
            HttpEntity requestEntity = new HttpEntity(requestMap,null);
            String responseAsString = restTemplate.postForObject("http://localhost:8088/rest/post",requestEntity,String.class);
            System.out.println("post1:" + responseAsString);
    
            //发送json数据
            requestMap= new LinkedMultiValueMap<String, String>();
            requestMap.add("client_id", "123");
            requestMap.add("app_code", "abc");
            // 必须加上header说明
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
            HttpEntity<String> jsonEntity = new HttpEntity<String>(new Gson().toJson(requestMap),headers);
            responseAsString = restTemplate.postForObject("http://localhost:8088/rest/post2",jsonEntity,String.class);
            System.out.println("postJson:" + responseAsString);
        }

exchange

/**
         * 可以指定调用类型
         */
        public static void exchange(){
            RestTemplate restTemplate = new RestTemplate();
    
            //发送post
            MultiValueMap<String, Object> params = new LinkedMultiValueMap<String, Object>();
            params.add("pageNo",1);
            HttpEntity entity = new HttpEntity(params,null);
            Notice testList = restTemplate.exchange("http://localhost:8088/rest/exchange1", HttpMethod.POST, entity, new ParameterizedTypeReference<Notice>() {}).getBody();
            System.out.println(testList.toString());
    
            Notice notice = restTemplate.exchange("http://localhost:8088/rest/exchange2?pageNo=66", HttpMethod.GET, null,new ParameterizedTypeReference<Notice>() {}).getBody() ;
            System.out.println(notice.toString());
        }

**对应controller**

@RestController
    @RequestMapping("/rest")
    public class RestController {
    
        @GetMapping("/notice")
        public Notice notice(){
            Notice notice = new Notice();
            notice.setMsg("666");
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    
        @GetMapping("/hello/5")
        public Notice hello5(){
            Notice notice = new Notice();
            notice.setMsg("hello5");
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    
        @GetMapping("/page")
        public Notice page(HttpServletRequest request){
            String start = request.getParameter("start");
            String page = request.getParameter("page");
    
            Notice notice = new Notice();
            notice.setMsg("start:" + start + ", page:" + page);
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    
        @PostMapping("/post")
        public Notice post1(HttpServletRequest request){
            String client_id = request.getParameter("client_id");
            String app_code = request.getParameter("app_code");
    
            Notice notice = new Notice();
            notice.setMsg("client_id:" + client_id + ", app_code:" + app_code);
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    
        @PostMapping("/post2")
        public Notice post2(@RequestBody String json){
            Notice notice = new Notice();
            notice.setMsg("json:" + json );
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    
        @PostMapping("/exchange1")
        public Notice exchange1(HttpServletRequest request){
            String pageNo = request.getParameter("pageNo");
    
            Notice notice = new Notice();
            notice.setMsg("post---pageNo:" + pageNo);
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    
        @GetMapping("/exchange2")
        public Notice exchange2(HttpServletRequest request){
            String pageNo = request.getParameter("pageNo");
    
            Notice notice = new Notice();
            notice.setMsg("get---pageNo:" + pageNo);
            notice.setStatus(1);
            notice.setData(new LinkedList<>());
            return notice;
        }
    }