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详解Java中restTemplate的使用

作者:代码的路

这篇文章主要为大家详细介绍了Java中restTemplate用法的相关资料,文中的示例代码讲解详细,对我们学习Java有一定的帮助,需要的可以参考一下

本文介绍restTemplate基础用法。

Java中get和post的用法请参考:一文带你搞懂Java中Get和Post的使用

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

    // 调用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", "张三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 调用get/post接口

使用restTemplate调用get/post接口。

2.1 Controller

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

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

    // 调用get接口验证账号密码
    @GetMapping("/useGetByPsw")
    public Map<String, Object> useGetByPsw() {
        return myService.useGetByPsw();
    }

    // 调用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协议的响应体
        String strObject = restTemplate.getForObject(getURL, String.class);
        JSONObject jsonObject = JSONObject.parseObject(strObject);

        // getForEntity返回的是ResponseEntity,是对HTTP响应的封装
        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,是对HTTP响应的封装
        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时,用MultiValueMap,不可使用HashMap。
        MultiValueMap<String, String> sendData = new LinkedMultiValueMap<>();
        sendData.add("number", "3");
        sendData.add("name", "张三post");

        // getForObject返回值是HTTP协议的响应体
        String strObject = restTemplate.postForObject(postURL, sendData, String.class);
        JSONObject jsonObject = JSONObject.parseObject(strObject);

        // getForEntity返回的是ResponseEntity,是对HTTP响应的封装
        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;
    }
}

到此这篇关于详解Java中restTemplate的使用的文章就介绍到这了,更多相关Java restTemplate内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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