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本文介紹(shao)restTemplate基(ji)礎用(yong)法。

Java中(zhong)get和post的(de)用法請參考：Java中Get和Post的使(shi)用(yong)

1 提(ti)供(gong)get/post接(jie)口

1.1 Controller

@RestController
@RequestMapping("/homepage")
public class MyController {
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    @Autowired
    MyService myService;
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    // 提(ti)供(gong)get接口
    @GetMapping("/provideGet")
    public Map<String, String> provideGet(){
        return myService.provideGet();
    }
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    // 提供(gong)post接口(kou)
    @PostMapping("/providePost")
    public Map<String, Object> providePost(@RequestParam("number") int number, @RequestParam("name") String name) {
        return myService.providePost(number, name);
    }
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    // 提供map參數(shu)的post接口(kou)
    @PostMapping("/providePostByMap")
    public Map<String, Object> providePostByMap(@RequestParam Map<String, Object> map) {
        return myService.providePostByMap(map);
    }
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    // 調用get接口
    @GetMapping("/useGet")
    public Map<String, Object> useGet() {
        return myService.useGet();
    }
}

1.2 Service

@Service
@EnableScheduling
public class MyService {
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    public Map<String, String> provideGet() {
        Map<String, String> res = new HashMap<>();
        res.put("number", "3");
        res.put("name", "張三(san)get");
        System.out.println("provideGet res:" + res + "\n");
        return res;
    }
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    public Map<String, Object> providePost(int number, String name) {
        Map<String, Object> res = new HashMap<>();
        res.put("number", number);
        res.put("name", name);
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        return res;
    }
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    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);
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        System.out.println("providePostByMap res:" + res + "\n");
        return res;
    }
}

2 調用get/post接口

使用restTemplate調用get/post接(jie)口。

• getForObject():返回值(zhi)是(shi)HTTP協(xie)議(yi)的響(xiang)應體(ti)

• getForEntity():返(fan)回的(de)是ResponseEntity，ResponseEntity是對HTTP響應(ying)的(de)封裝(zhuang)，除了(le)包(bao)含(han)響應(ying)體(ti)，還包(bao)含(han)HTTP狀態碼、contentType、contentLength、Header等信息(xi)

2.1 Controller

@RestController
@RequestMapping("/homepage")
public class MyController {    
    @Autowired
    MyService myService;
?
    // 調用get接口
    @GetMapping("/useGet")
    public Map<String, Object> useGet() {
        return myService.useGet();
    }
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    // 調用get接口(kou)驗證賬號(hao)密(mi)碼(ma)
    @GetMapping("/useGetByPsw")
    public Map<String, Object> useGetByPsw() {
        return myService.useGetByPsw();
    }
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    // 調用(yong)post接(jie)口
    @PostMapping("/usePost")
    public Map<String, Object> usePost() {
        return myService.usePost();
    }
}

2.2 Service

@Service
@EnableScheduling
public class MyService {
    @Resource
    private RestTemplate restTemplate;
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    String getURL = "//localhost:8081/homepage/provideGet";
    String postURL = "//localhost:8081/homepage/providePostByMap";
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    public Map<String, Object> useGet() {
        // getForObject返回值是(shi)HTTP協(xie)議的響(xiang)應體
        String strObject1 = restTemplate.getForObject(getURL, String.class); //無(wu)參(can)
        JSONObject jsonObject1 = JSONObject.parseObject(strObject1);
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        MultiValueMap<String, String> sendData = new LinkedMultiValueMap<>();
        sendData.add("number", "3");
        sendData.add("name", "張三(san)post");
        String strObject2 = restTemplate.getForObject(getURL, String.class, sendData); // 帶參(can)
        JSONObject jsonObject2 = JSONObject.parseObject(strObject2);
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        // getForEntity返回的是ResponseEntity，是對HTTP響應(ying)的封裝(zhuang)
        ResponseEntity<ResponseResult> responseData = restTemplate.getForEntity(getURL, ResponseResult.class);
        Map<String, Object> returnData = new HashMap<>();
        returnData.put("StatusCode:", responseData.getStatusCode());
        returnData.put("Body:", responseData.getBody());
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        System.out.println("useGet jsonObject1:" + jsonObject1 + "\n");
        System.out.println("useGet jsonObject2:" + jsonObject2 + "\n");
        System.out.println("useGet responseData:" + responseData + "\n");
        System.out.println("useGet returnData:" + returnData + "\n");
        return returnData;
    }
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    public Map<String, Object> useGetByPsw() {
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        RestTemplateBuilder builder = new RestTemplateBuilder();
        RestTemplate restTemplate = builder.basicAuthentication("username", "password").build();
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        // getForEntity返回的是ResponseEntity，是對HTTP響應的封(feng)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());
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        System.out.println("useGetByPsw returnData:" + responseData + "\n");
        System.out.println("useGetByPsw returnData:" + returnData + "\n");
        return returnData;
    }
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    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");
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        // getForObject返(fan)回(hui)值是(shi)HTTP協議的響應體
        String strObject = restTemplate.postForObject(postURL, sendData, String.class);
        JSONObject jsonObject = JSONObject.parseObject(strObject);
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        // getForEntity返回的(de)是(shi)ResponseEntity，是(shi)對HTTP響應的(de)封裝(zhuang)
        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());
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        System.out.println("usePost jsonObject:" + jsonObject + "\n");
        System.out.println("usePost responseData:" + responseData + "\n");
        System.out.println("usePost returnData:" + returnData + "\n");
        return returnData;
    }
}