org.springframework.web.client.HttpClientErrorException：400使用HttpEntity restTemplate.exchange的錯誤請求

Question

將某些數據發布到客戶端api時，我收到HttpClientErrorException：400錯誤的請求。

異常堆棧跟蹤：

org.springframework.web.client.HttpClientErrorException: 400 Bad Request
org.springframework.web.client.HttpClientErrorException: 400 Bad Request
        at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91)
        at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:667)
        at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:620)
        at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:580)
        at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:498)

碼

模式類別1：UserApiResponseBean.java

import java.util.List;

public class UserApiResponseBean {

    private String userCode;

    private String userName;

    private List<Department> DepartmentList;

    public String getUserCode() {
        return userCode;
    }

    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public List<Department> getDepartmentList() {
        return DepartmentList;
    }

    public void setDepartmentList(List<Department> departmentList) {
        DepartmentList = departmentList;
    }

}

模型類別2：Department.java

public class Department {

    private String departmentName;

    private String businessArea;

    public String getDepartmentName() {
        return departmentName;
    }

    public void setDepartmentName(String departmentName) {
        this.departmentName = departmentName;
    }

    public String getBusinessArea() {
        return businessArea;
    }

    public void setBusinessArea(String businessArea) {
        this.businessArea = businessArea;
    }

}

客戶端代碼：調用客戶端api的代碼段

UserApiResponseBean userApiResponseBean = new UserApiResponseBean();
        userApiResponseBean.setUserName("userName1");
        userApiResponseBean.setUserCode("001");

        List<Department> departmentList = new ArrayList<Department>();

        Department departmanetData = new Department();
        departmanetData.setDepartmentName("Department 1");
        departmanetData.setBusinessArea("Business Area 1");

        departmentList.add(departmanetData);

        userApiResponseBean.setDepartmentList(departmentList);

        String userId="userId";
        String password="password";

        String url = "client api url";

        HttpHeaders requestHeader = new HttpHeaders();
        String encoding = Base64.getEncoder().encodeToString((userId + ":" + password).getBytes());
        requestHeader.add(HttpHeaders.AUTHORIZATION, "Basic " + encoding);
        requestHeader.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
        requestHeader.setContentType(MediaType.APPLICATION_JSON);

        HttpEntity<UserApiResponseBean> requestEntity = new HttpEntity<UserApiResponseBean>(userApiResponseBean, requestHeader);

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
        restTemplate.getMessageConverters().add(new StringHttpMessageConverter());

        ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);
        String result = responseEntity.getBody();

不知何故，請求構造已損壞。 你能幫忙嗎？ 我在Model類中沒有任何與json / xml相關的注釋，在spring-context.xml中也沒有與json / spring rest相關的數據。 那是問題嗎？ 我們正在使用Spring 4.3.0

客戶端期望一個json數據，它們沒有相同的UserApiResponseBean.java類。

Answer 1

僅添加轉換器名稱是不夠的。 確保您的類路徑中存在Jackson2

傑克遜2.x – com.fasterxml.jackson.databind

如果使用Maven

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.3</version>
</dependency>