本教程演示如何使用Apache HttpClient 4.5發(fā)出Http PUT請(qǐng)求。 HTTP PUT請(qǐng)求方法請(qǐng)求服務(wù)器接受并存儲(chǔ)提供的URI中包含的實(shí)體。如果該URI引用已經(jīng)存在的資源，則該資源被修改; 如果URI不指向現(xiàn)有資源，則服務(wù)器可以使用該URI創(chuàng)建資源。

Maven依賴關(guān)系

我們使用maven來管理依賴關(guān)系，并使用Apache HttpClient 4.5版本。將以下依賴項(xiàng)添加到您的項(xiàng)目中，以便創(chuàng)建HTTP PUT請(qǐng)求方法。

pom.xml 文件的內(nèi)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請(qǐng)求方法示例

在以下示例中，我們將數(shù)據(jù)發(fā)布到資源URL:http://httpbin.org/put 。該資源確認(rèn)數(shù)據(jù)并返回一個(gè)JSON對(duì)象，我們只需將其打印到控制臺(tái)。注意:使用Java7的try-with-resources來自動(dòng)處理關(guān)閉ClosableHttpClient。接下來使用Java 8的lambda作為ResponseHandler。在這里，根據(jù)Http狀態(tài)代碼判斷返回狀態(tài)，當(dāng)一切正常時(shí)，我們會(huì)將解析的響應(yīng)正文返回給String。當(dāng)狀態(tài)碼不是所期望的時(shí)候，將拋出一個(gè)ClientProtocolException，表明Http PUT請(qǐng)求方法失敗。最后，我們將響應(yīng)主體打印到控制臺(tái)。

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);
        }
    }
}

執(zhí)行上面示例代碼，得到以下結(jié)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"
}

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