HttpClient HTTP PUT请求方法示例
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2023-03-14
本教程演示如何使用Apache HttpClient 4.5
发出Http PUT请求。 HTTP PUT请求方法请求服务器接受并存储提供的URI中包含的实体。 如果该URI引用已经存在的资源,则该资源被修改; 如果URI不指向现有资源,则服务器可以使用该URI创建资源。
Maven依赖关系
我们使用maven来管理依赖关系,并使用Apache HttpClient 4.5
版本。 将以下依赖项添加到您的项目中,以便创建HTTP PUT请求方法。
pom.xml 文件的内容如下 -
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.yiibai.httpclient.httmethods</groupId>
<artifactId>http-get</artifactId>
<version>1.0.0-SNAPSHOT</version>
<url>https://memorynotfound.com</url>
<name>httpclient - ${project.artifactId}</name>
<dependencies>
<!-- Apache Commons IO -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
HTTP PUT请求方法示例
在以下示例中,我们将数据发布到资源URL:http://httpbin.org/put
。 该资源确认数据并返回一个JSON对象,我们只需将其打印到控制台。 注意:使用Java7
的try-with-resources
来自动处理关闭ClosableHttpClient
。 接下来使用Java 8
的lambda
作为ResponseHandler
。 在这里,根据Http状态代码判断返回状态,当一切正常时,我们会将解析的响应正文返回给String。 当状态码不是所期望的时候,将抛出一个ClientProtocolException
,表明Http PUT请求方法失败。 最后,我们将响应主体打印到控制台。
文件:HttpPutRequestMethodExample.java -
package com.yiibai.httpdemo;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
/**
* This example demonstrates the use of {@link HttpPut} request method.
*/
public class HttpPutRequestMethodExample {
public static void main(String... args) throws IOException {
try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
HttpPut httpPut = new HttpPut("http://httpbin.org/put");
httpPut.setEntity(new StringEntity("Hello, World"));
System.out.println("Executing request " + httpPut.getRequestLine());
// Create a custom response handler
ResponseHandler<String> responseHandler = response -> {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
};
String responseBody = httpclient.execute(httpPut, responseHandler);
System.out.println("----------------------------------------");
System.out.println(responseBody);
}
}
}
执行上面示例代码,得到以下结果 -
Executing request PUT http://httpbin.org/put HTTP/1.1
----------------------------------------
{
"args": {},
"data": "Hello, World",
"files": {},
"form": {},
"headers": {
"Accept-Encoding": "gzip,deflate",
"Connection": "close",
"Content-Length": "12",
"Content-Type": "text/plain; charset=ISO-8859-1",
"Host": "httpbin.org",
"User-Agent": "Apache-HttpClient/4.5.5 (Java/1.8.0_65)"
},
"json": null,
"origin": "112.67.166.104",
"url": "http://httpbin.org/put"
}