java8 将 HttpHeaders赋值到 Consumer<HttpHeaders>
时间: 2024-03-14 21:43:47 浏览: 104
可以使用Lambda表达式将HttpHeaders赋值到Consumer<HttpHeaders>中,示例代码如下:
```
HttpHeaders headers = new HttpHeaders();
headers.add("Authorization", "Bearer TOKEN");
Consumer<HttpHeaders> consumer = (httpHeaders) -> {
httpHeaders.addAll(headers);
};
```
在上面的代码中,我们首先创建了一个HttpHeaders对象,并添加了一个Authorization头部。然后,我们使用Lambda表达式将这个HttpHeaders对象赋值给了一个Consumer<HttpHeaders>对象。在Lambda表达式内部,我们将headers对象的所有头部添加到Consumer<HttpHeaders>对象中的httpHeaders对象中。
相关问题
Java将对象的键值对赋值给httpheaders
在Java中,如果你有一个对象(如`User`)你想作为HTTP请求头的一部分发送,通常你会将该对象转换为某种键值对形式,如JSON、URL参数或者直接编码为字符串。这里以JSON为例:
首先,你需要将`User`对象转换为JSON字符串:
```java
import com.google.gson.Gson;
User user = ...; // 假设已经有一个User对象
Gson gson = new Gson();
String json = gson.toJson(user);
```
然后,你可以将这个JSON字符串设置到`HttpHeaders`里,通常是在构建`HttpEntity`或`HttpResponseEntity`时:
```java
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON); // 设置Content-Type为JSON
headers.set("X-User-Data", json);
```
如果你不想暴露原始的用户对象,也可以选择只发送必要的属性:
```java
Map<String, Object> userData = new HashMap<>();
userData.put("username", user.getUsername());
userData.put("email", user.getEmail());
json = gson.toJson(userData);
```
BillHead billHead = new BillHead(); billHead.setCopListNo("12312524"); billHead.setCopNo("18"); try { XmlMapper xmlMapper = new XmlMapper(); xmlMapper.enable(SerializationFeature.INDENT_OUTPUT); String xml = xmlMapper.writeValueAsString(billHead); xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + xml; HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_XML); return new ResponseEntity<>(xml, headers, HttpStatus.OK); } catch (JsonProcessingException e) { return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR); } 修改此代码return new ResponseEntity<>(xml, headers, HttpStatus.OK) 以Object接收
修改后的代码如下:
```java
BillHead billHead = new BillHead();
billHead.setCopListNo("12312524");
billHead.setCopNo("18");
try {
XmlMapper xmlMapper = new XmlMapper();
xmlMapper.enable(SerializationFeature.INDENT_OUTPUT);
String xml = xmlMapper.writeValueAsString(billHead);
xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + xml;
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_XML);
Object result = xml; // 将xml字符串赋值给Object类型变量result
return new ResponseEntity<>(result, headers, HttpStatus.OK);
} catch (JsonProcessingException e) {
return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
}
```
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