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詳解Java中restTemplate的使用

更新時間：2022年11月16日 08:18:28 作者：代碼的路

這篇文章主要為大家詳細介紹了Java中restTemplate用法的相關(guān)資料，文中的示例代碼講解詳細，對我們學習Java有一定的幫助，需要的可以參考一下

1 提供get/post接口

1.1 Controller

@RestController
@RequestMapping("/homepage")
public class MyController {

    @Autowired
    MyService myService;

    // 提供get接口
    @GetMapping("/provideGet")
    public Map<String, String> provideGet(){
        return myService.provideGet();
    }

    // 提供post接口
    @PostMapping("/providePost")
    public Map<String, Object> providePost(@RequestParam("number") int number, @RequestParam("name") String name) {
        return myService.providePost(number, name);
    }

    // 提供map參數(shù)的post接口
    @PostMapping("/providePostByMap")
    public Map<String, Object> providePostByMap(@RequestParam Map<String, Object> map) {
        return myService.providePostByMap(map);
    }

    // 調(diào)用get接口
    @GetMapping("/useGet")
    public Map<String, Object> useGet() {
        return myService.useGet();
    }
}

1.2 Service

@Service
@EnableScheduling
public class MyService {

    public Map<String, String> provideGet() {
        Map<String, String> res = new HashMap<>();
        res.put("number", "3");
        res.put("name", "張三get");
        System.out.println("provideGet res:" + res + "\n");
        return res;
    }

    public Map<String, Object> providePost(int number, String name) {
        Map<String, Object> res = new HashMap<>();
        res.put("number", number);
        res.put("name", name);

        return res;
    }

    public Map<String, Object> providePostByMap(Map<String, Object> map) {
        int number = map.get("number") == null ? 0 : Integer.parseInt((String) map.get("number"));
        String name = map.get("name") == null ? "" : (String) map.get("name");
        Map<String, Object> res = new HashMap<>();
        res.put("number", number);
        res.put("name", name);

        System.out.println("providePostByMap res:" + res + "\n");
        return res;
    }
}

2 調(diào)用get/post接口

使用restTemplate調(diào)用get/post接口。

getForObject():返回值是HTTP協(xié)議的響應(yīng)體
getForEntity():返回的是ResponseEntity，ResponseEntity是對HTTP響應(yīng)的封裝，除了包含響應(yīng)體，還包含HTTP狀態(tài)碼、contentType、contentLength、Header等信息

2.1 Controller

@RestController
@RequestMapping("/homepage")
public class MyController {    
    @Autowired
    MyService myService;

    // 調(diào)用get接口
    @GetMapping("/useGet")
    public Map<String, Object> useGet() {
        return myService.useGet();
    }

    // 調(diào)用get接口驗證賬號密碼
    @GetMapping("/useGetByPsw")
    public Map<String, Object> useGetByPsw() {
        return myService.useGetByPsw();
    }

    // 調(diào)用post接口
    @PostMapping("/usePost")
    public Map<String, Object> usePost() {
        return myService.usePost();
    }
}

2.2 Service

@Service
@EnableScheduling
public class MyService {
    @Resource
    private RestTemplate restTemplate;

    String getURL = "http://localhost:8081/homepage/provideGet";
    String postURL = "http://localhost:8081/homepage/providePostByMap";

    public Map<String, Object> useGet() {
        // getForObject返回值是HTTP協(xié)議的響應(yīng)體
        String strObject = restTemplate.getForObject(getURL, String.class);
        JSONObject jsonObject = JSONObject.parseObject(strObject);

        // getForEntity返回的是ResponseEntity，是對HTTP響應(yīng)的封裝
        ResponseEntity<ResponseResult> responseData = restTemplate.getForEntity(getURL, ResponseResult.class);
        Map<String, Object> returnData = new HashMap<>();
        returnData.put("StatusCode:", responseData.getStatusCode());
        returnData.put("Body:", responseData.getBody());

        System.out.println("useGet jsonObject:" + jsonObject + "\n");
        System.out.println("useGet responseData:" + responseData + "\n");
        System.out.println("useGet returnData:" + returnData + "\n");
        return returnData;
    }

    public Map<String, Object> useGetByPsw() {

        RestTemplateBuilder builder = new RestTemplateBuilder();
        RestTemplate restTemplate = builder.basicAuthentication("username", "password").build();

        // getForEntity返回的是ResponseEntity，是對HTTP響應(yīng)的封裝
        ResponseEntity<ResponseResult> responseData = restTemplate.getForEntity(getURL, ResponseResult.class);
        Map<String, Object> returnData = new HashMap<>();
        returnData.put("StatusCode:", responseData.getStatusCode());
        returnData.put("Body:", responseData.getBody());

        System.out.println("useGetByPsw returnData:" + responseData + "\n");
        System.out.println("useGetByPsw returnData:" + returnData + "\n");
        return returnData;
    }

    public Map<String, Object> usePost() {
        //RestTemplate在postForObject時，用MultiValueMap，不可使用HashMap。
        MultiValueMap<String, String> sendData = new LinkedMultiValueMap<>();
        sendData.add("number", "3");
        sendData.add("name", "張三post");

        // getForObject返回值是HTTP協(xié)議的響應(yīng)體
        String strObject = restTemplate.postForObject(postURL, sendData, String.class);
        JSONObject jsonObject = JSONObject.parseObject(strObject);

        // getForEntity返回的是ResponseEntity，是對HTTP響應(yīng)的封裝
        ResponseEntity<ResponseResult> responseData = restTemplate.postForEntity(postURL, sendData, ResponseResult.class);
        Map<String, Object> returnData = new HashMap<>();
        returnData.put("StatusCode:", responseData.getStatusCode());
        returnData.put("Body:", responseData.getBody());

        System.out.println("usePost jsonObject:" + jsonObject + "\n");
        System.out.println("usePost responseData:" + responseData + "\n");
        System.out.println("usePost returnData:" + returnData + "\n");
        return returnData;
    }
}

到此這篇關(guān)于詳解Java中restTemplate的使用的文章就介紹到這了,更多相關(guān)Java restTemplate內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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