Java发送form-data请求
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在Java中发送form-data请求,可以使用Apache HttpClient或OkHttp这样的HTTP客户端库来发送请求。
一、HttpClient
1.添加依赖
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.13</version>
</dependency>
2.代码
package request;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import java.io.File;
import java.io.IOException;
public class FormDataExample {
public static void main(String[] args) throws IOException {
String url = "http://127.0.0.1:3000/aaa/fileUpload.jsp";
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addTextBody("text2", "value1");
builder.addTextBody("text3", "value2");
builder.addBinaryBody("file1", new File("D:\\fanwei\\学习\\工具地址.txt"), ContentType.APPLICATION_OCTET_STREAM, "filename2.txt");
String StringResult = sendPostFormData(url, builder);
System.out.println(StringResult);
}
/**
* @param url 请求地址
* @param builder
* @return
*/
public static String sendPostFormData(String url, MultipartEntityBuilder builder){
String StringResult = "";
//不需要手动关闭httpClient
HttpClient httpClient = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost(url);
// 构建form-data请求体
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
// 发送请求并获取响应
HttpResponse response = null;
try {
response = httpClient.execute(httpPost);
HttpEntity responseEntity = response.getEntity();
StringResult = EntityUtils.toString(responseEntity);
} catch (IOException e) {
StringResult = "errorException:" + e.getMessage();
e.printStackTrace();
}
return StringResult;
}
}
对于HttpClient对象,HttpClientBuilder.create().build()创建的实例是不需要手动关闭的。
在使用HttpClientBuilder创建HttpClient对象时,不需要手动关闭HttpClient对象。这是因为HttpClientBuilder在创建HttpClient对象时,会自动管理底层的连接池和资源释放。
HttpClientBuilder会创建一个CloseableHttpClient的实例,它实现了Closeable接口,可以自动关闭相关资源。当不再需要使用HttpClient时,可以让垃圾回收器自动回收HttpClient对象,并自动关闭底层的连接池和资源。
需要注意的是,如果使用了连接池,关闭HttpClient并不会立即关闭底层的连接池,而是将连接返回给连接池以供重用。连接池会根据一定的策略来管理连接的生命周期。因此,关闭HttpClient并不会立即关闭与服务器的连接,而是将连接返回给连接池以供下次使用。
总结起来,使用HttpClientBuilder创建的HttpClient对象不需要手动关闭,它会自动管理底层的连接池和资源释放。当不再需要使用HttpClient时,可以让垃圾回收器自动回收HttpClient对象。
二、OkHttp
1.添加依赖
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.13</version>
</dependency>
2.代码
package request;
import okhttp3.*;
import java.io.File;
import java.io.IOException;
public class FormDataExample2 {
public static void main(String[] args) throws IOException {
OkHttpClient client = new OkHttpClient();
// 构建form-data请求体
RequestBody requestBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("field1", "value1")
.addFormDataPart("field2", "value2")
.addFormDataPart("file", "filename.txt",
RequestBody.create(MediaType.parse("application/octet-stream"), new File("D:\\fanwei\\学习\\工具地址.txt")))
.build();
// 构建请求
Request request = new Request.Builder()
.url("http://127.0.0.1:3000/aaa/fileUpload.jsp")
.post(requestBody)
.build();
// 发送请求并获取响应
try (Response response = client.newCall(request).execute()) {
String responseBody = response.body().string();
// 处理响应
System.out.println(responseBody);
}
}
}
其他发送请求,请参阅
httpclient 发送请求_httpclient发请求_有梦想的菜的博客-CSDN博客
文件上传,请参阅
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