Groovy如何使用request

Groovy可以使用Java的HttpURLConnection或Apache HttpComponents来发送HTTP请求。其中HttpURLConnection是Java自带的HTTP客户端，而Apache HttpComponents是一个第三方库。

以下是使用HttpURLConnection发送GET请求的示例代码：

def url = new URL("http://example.com/api")
def conn = url.openConnection()
conn.setRequestMethod("GET")

def responseCode = conn.getResponseCode()
if (responseCode == HttpURLConnection.HTTP_OK) {
    def reader = new BufferedReader(new InputStreamReader(conn.getInputStream()))
    def response = new StringBuffer()
    String line
    while ((line = reader.readLine()) != null) {
        response.append(line)
    }
    reader.close()
    println(response.toString())
} else {
    println("Failed to fetch data from server")
}

以下是使用Apache HttpComponents发送POST请求的示例代码：

@Grab(group='org.apache.httpcomponents', module='httpclient', version='4.5.13')
import org.apache.http.impl.client.DefaultHttpClient
import org.apache.http.client.methods.HttpPost
import org.apache.http.entity.StringEntity

def httpClient = new DefaultHttpClient()
def postMethod = new HttpPost("http://example.com/api")
postMethod.setHeader("Content-Type", "application/json")

def requestBody = [
    name: "John Doe",
    age: 30
]
def requestJson = new JsonBuilder(requestBody).toString()
postMethod.setEntity(new StringEntity(requestJson))

def response = httpClient.execute(postMethod)
def entity = response.getEntity()
if (entity != null) {
    def responseJson = EntityUtils.toString(entity)
    println(responseJson)
}