Resttemplate表单多部分：POST中的图像+ JSON

使用RestTemplate进行表单/多部分POST请求是在Java中发送HTTP请求的常见方法之一。在实际开发中，我们经常需要将图像文件和JSON数据一起发送给服务器进行处理。在本文中，我们将学习如何使用RestTemplate来实现这样的请求，并提供一个案例代码来帮助理解。

java
// 创建RestTemplate对象
RestTemplate restTemplate = new RestTemplate();
// 创建请求头
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
// 创建请求体
MultiValueMap body = new LinkedMultiValueMap<>();
body.add("name", "John Doe");
body.add("age", 25);
// 创建文件资源
Resource imageResource = new FileSystemResource("path/to/image.jpg");
body.add("image", imageResource);
// 创建请求对象
HttpEntity> requestEntity = new HttpEntity<>(body, headers);
// 发送POST请求
String url = "http://example.com/api/upload";
ResponseEntity response = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);
// 处理响应
if (response.getStatusCode() == HttpStatus.OK) {
    String responseBody = response.getBody();
    System.out.println("Response: " + responseBody);
} else {
    System.out.println("Request failed with status code: " + response.getStatusCode());
}

java
// 创建RestTemplate对象
RestTemplate restTemplate = new RestTemplate();
// 创建请求头
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
// 创建请求体
MultiValueMap body = new LinkedMultiValueMap<>();
body.add("name", "John Doe");
body.add("age", 25);
// 创建文件资源
Resource imageResource = new FileSystemResource("path/to/image.jpg");
body.add("image", imageResource);
// 创建请求对象
HttpEntity> requestEntity = new HttpEntity<>(body, headers);
// 发送POST请求
String url = "http://example.com/api/upload";
ResponseEntity response = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);
// 处理响应
if (response.getStatusCode() == HttpStatus.OK) {
    String responseBody = response.getBody();
    System.out.println("Response: " + responseBody);
} else {
    System.out.println("Request failed with status code: " + response.getStatusCode());
}