今天想实现 java 后端发送 formdata 上传文件，为了以后查找方便，特此记录下来
上一次使用 WebClient 实现远程调用 (一个非阻塞、响应式的HTTP客户端，它以响应式被压流的方式执行HTTP请求) 查看
现在使用的 RestTemplate
RestTemplate 是在客户端访问 Restful 服务的一个核心类
默认使用 JDK 提供的包去建立HTTP连接
为每种 HTTP 请求都实现了相关的请求封装方法
public T postForObject(URI url, @Nullable Object request, Class responseType)
url -> URI类型的请求路径
request -> 请求体对象
responseType -> 响应数据类型
packagecom.example.hystrix.controller;importorg.springframework.core.io.FileSystemResource;importorg.springframework.util.LinkedMultiValueMap;importorg.springframework.util.MultiValueMap;importorg.springframework.web.bind.annotation.RequestMapping;importorg.springframework.web.bind.annotation.RestController;importorg.springframework.web.client.RestTemplate;importjava.io.File;
@RestControllerpublic classDemoController {
@RequestMapping(“/upload”)publicString upload() {
String url= “http://localhost:2001/api/upload”; //上传的地址
String filePath = “E:\\test\\test.dxf”;
RestTemplate rest= newRestTemplate();
FileSystemResource resource= new FileSystemResource(newFile(filePath));
MultiValueMap param = new LinkedMultiValueMap<>();
param.add(“files”, resource); //MultipartFile的名称String rs= rest.postForObject(url, param, String.class);
System.out.println(rs);
returnrs;
}
}
或者
public ResponseEntity exchange(URI url, HttpMethod method, @Nullable HttpEntity> requestEntity, Class responseType)
url -> URI类型的请求路径
method-> 请求方式
requestEntity-> 请求体
responseType -> 响应数据类型
packagecom.example.hystrix.controller;importorg.springframework.core.io.FileSystemResource;importorg.springframework.http.HttpEntity;importorg.springframework.http.HttpMethod;importorg.springframework.http.ResponseEntity;importorg.springframework.util.LinkedMultiValueMap;importorg.springframework.util.MultiValueMap;importorg.springframework.web.bind.annotation.RequestMapping;importorg.springframework.web.bind.annotation.RestController;importorg.springframework.web.client.RestTemplate;importjava.io.File;
@RestControllerpublic classDemoController {
@RequestMapping(“/upload”)publicString upload() {
String url= “http://localhost:2001/api/upload”; //上传的地址
String filePath = “E:\\test\\test.dxf”;
RestTemplate rest= newRestTemplate();
FileSystemResource resource= new FileSystemResource(newFile(filePath));
MultiValueMap param = new LinkedMultiValueMap<>();
param.add(“files”, resource); //MultipartFile的名称HttpEntity> httpEntity = new HttpEntity>(param);
ResponseEntity responseEntity = rest.exchange(url, HttpMethod.POST, httpEntity, String.class);
String rs=responseEntity.getBody();
System.out.println(rs);
returnrs;
}
}
原文：https://www.cnblogs.com/baby123/p/12174942.html
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