httpcomponents.httpclient 使用
1.使用场景
两个Spring Boot 项目DemoA 和 DemoB。DemoA 需要调用DemoB提供的接口，并且传递数据，接收dmeoB的返回数据。
在使用http请求时，需要考虑
- http请求的是否正常完成， status 200.
- http请求 在服务提供方(Demo B)的response有哪几种情况， 在服务消费方(Demo A)怎么处理这几种response
2. Demo B
1.添加依赖
<properties>
<alibaba.fastjson.version>1.2.75</alibaba.fastjson.version>
<projecglombok.version>1.18.18</projecglombok.version>
</properties>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${alibaba.fastjson.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${projecglombok.version}</version>
</dependency>
server.port=8010
3. request 请求实体类
import lombok.Data;
@Data
public class StudentRequest {
private String name;
private Integer age;
private String attachmentFolder;
private String attachmentName;
private byte[] attachment;
}
4. response 响应实体类
import lombok.Data;
@Data
public class StudentResponse {
private String result;
private String message;
}
5. 文件工具类 Java 文件和字节数组互转
6. controller 服务提供
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.alibaba.fastjson.JSONObject;
@RestController
@RequestMapping("/api/student")
public class StudentController {
Logger logger = LoggerFactory.getLogger(StudentController.class);
@PostMapping("/search")
public StudentResponse search(@RequestBody StudentRequest request) throws InterruptedException {
logger.info("request is {}", JSONObject.toJSONString(request));
StudentResponse studentResponse = new StudentResponse();
studentResponse.setResult("success");
studentResponse.setMessage("wow! success! ");
logger.info("request return {}", JSONObject.toJSONString(studentResponse));
return studentResponse;
}
@PostMapping(value = "/save")
public ResponseEntity<StudentResponse> save(@RequestBody StudentRequest studentRequest) {
StudentResponse studentResponse = new StudentResponse();
logger.info("student name is {},age is {}", studentRequest.getName(), studentRequest.getAge());
String filePath = studentRequest.getAttachmentFolder();
String fileName = studentRequest.getAttachmentName();
byte[] fileContent = studentRequest.getAttachment();
FileUtil.byte2File(fileContent, filePath, fileName);
studentResponse.setResult("success");
studentResponse.setMessage("wow! success! ");
return new ResponseEntity<>(studentResponse, HttpStatus.OK);
}
@PostMapping(value = "/saveList")
public ResponseEntity<StudentResponse> save(@RequestBody List<StudentRequest> studentRequests) {
StudentResponse studentResponse = new StudentResponse();
for (StudentRequest studentRequest : studentRequests) {
logger.info("student name is {},age is {}", studentRequest.getName(), studentRequest.getAge());
String filePath = studentRequest.getAttachmentFolder();
String fileName = studentRequest.getAttachmentName();
byte[] fileContent = studentRequest.getAttachment();
FileUtil.byte2File(fileContent, filePath, fileName);
}
studentResponse.setResult("success");
studentResponse.setMessage("wow! success! ");
return new ResponseEntity<>(studentResponse, HttpStatus.OK);
}
}
1. 添加依赖
<properties>
<alibaba.fastjson.version>1.2.75</alibaba.fastjson.version>
<projecglombok.version>1.18.18</projecglombok.version>
<httpclient.version>4.5.13</httpclient.version>
</properties>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${alibaba.fastjson.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${projecglombok.version}</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>${httpclient.version}</version>
</dependency>
2. 配置文件 application.properties
file.folder=C:/test/demoB/ #url url.http = http://localhost:8010/api url.student.search = /student/search url.student.save = /student/save url.student.saveList =/student/saveList
4. FileUtil 工具类 Java 文件和字节数组互转
5. HttpClient 工具类 和 HttpResponseEntity
import lombok.Data;
@Data
public class HttpResponseEntity {
private Integer statusCode;
private String responseMessage;
}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HttpClientUtil {
static Logger logger = LoggerFactory.getLogger(DemoAApplication.class);
public static HttpResponseEntity doPost(String url, String data) {
HttpResponseEntity httpResponseEntity = new HttpResponseEntity();
// 1.创建HttpGet实例
HttpPost post = new HttpPost(url);
// 2.设置请求体
StringEntity myEntity = new StringEntity(data, ContentType.APPLICATION_JSON);
post.setEntity(myEntity);
// 3.使用HttpClient发送get请求，获得返回结果HttpResponse
CloseableHttpClient client = HttpClients.createDefault();
try {
// 4.从connect Manager获取Connection 超时时间3min, 连接目标超时 5min, 等待响应超时10min
RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(180000).setConnectTimeout(300000).setSocketTimeout(600000).build();
post.setConfig(requestConfig);
// 5.读取返回结果
HttpResponse response = client.execute(post);
int statusCode = response.getStatusLine().getStatusCode();
httpResponseEntity.setStatusCode(statusCode);
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream in = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String resultMessage = reader.readLine();
reader.close();
in.close();
httpResponseEntity.setResponseMessage(resultMessage);
}
} catch (Exception e) {
httpResponseEntity.setStatusCode(0);
logger.error("HTTP POST Error, url is {}", url);
logger.error(e.getMessage(), e);
} finally {
if (null != client) {
try {
client.close();
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
}
}
return httpResponseEntity;
}
}
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.alibaba.fastjson.JSONObject;
@RestController
@RequestMapping("/api/student")
public class StudentController {
@Value("${file.folder}")
private String fileFolder;
@Value("${url.http}")
private String urlHttp;
@Value("${url.student.search}")
private String urlStudentSearch;
@Value("${url.student.save}")
private String urlStudentSave;
@Value("${url.student.saveList}")
private String urlStudentSaveList;
Logger logger = LoggerFactory.getLogger(StudentController.class);
@GetMapping("/search")
public void search() {
// 请求参数
StudentRequest request = new StudentRequest();
request.setName("xiaoming");
request.setAge(22);
String requestString = JSONObject.toJSONString(request);
// 请求url
String serviceUrl = urlHttp + urlStudentSearch;
// 执行请求
HttpResponseEntity httpResponseEntity = HttpClientUtil.doPost(serviceUrl, requestString);
// 请求返回
if (httpResponseEntity.getStatusCode() == 200) {
StudentResponse studentResponse = JSONObject.parseObject(httpResponseEntity.getResponseMessage(), StudentResponse.class);
logger.info("studentResponse is {}", JSONObject.toJSONString(studentResponse));
}
}
@GetMapping("/save")
public void save() {
// 请求参数
StudentRequest request = new StudentRequest();
request.setName("xiaoming");
request.setAge(22);
request.setAttachmentName("test.xls");
request.setAttachmentFolder(fileFolder);
byte[] fileByte = FileUtil.file2Byte(new File("C:\\test\\demoA\\test.xls"));
request.setAttachment(fileByte);
String requestString = JSONObject.toJSONString(request);
// 请求url
String serviceUrl = urlHttp + urlStudentSave;
// 执行请求
HttpResponseEntity httpResponseEntity = HttpClientUtil.doPost(serviceUrl, requestString);
// 请求返回
if (httpResponseEntity.getStatusCode() == 200) {
StudentResponse studentResponse = JSONObject.parseObject(httpResponseEntity.getResponseMessage(), StudentResponse.class);
logger.info("studentResponse is {}", JSONObject.toJSONString(studentResponse));
}
}
@GetMapping("/saveList")
public void saveList() {
// 请求参数
List<StudentRequest> studentRequests = new ArrayList<StudentRequest>();
StudentRequest studentRequest1 = new StudentRequest();
studentRequest1.setName("Melody");
studentRequest1.setAge(22);
studentRequest1.setAttachmentName("test1.xls");
studentRequest1.setAttachmentFolder(fileFolder);
byte[] fileByte = FileUtil.file2Byte(new File("C:\\test\\demoA\\test1.xls"));
studentRequest1.setAttachment(fileByte);
studentRequests.add(studentRequest1);
StudentRequest studentRequest2 = new StudentRequest();
studentRequest2.setName("Sara");
studentRequest2.setAge(21);
studentRequest2.setAttachmentName("test2.xls");
studentRequest2.setAttachmentFolder(fileFolder);
byte[] fileByte2 = FileUtil.file2Byte(new File("C:\\test\\demoA\\test2.xls"));
studentRequest2.setAttachment(fileByte2);
studentRequests.add(studentRequest2);
String requestString = JSONObject.toJSONString(studentRequests);
// 请求url
String serviceUrl = urlHttp + urlStudentSaveList;
// 执行请求
HttpResponseEntity httpResponseEntity = HttpClientUtil.doPost(serviceUrl, requestString);
// 请求返回
if (httpResponseEntity.getStatusCode() == 200) {
StudentResponse studentResponse = JSONObject.parseObject(httpResponseEntity.getResponseMessage(), StudentResponse.class);
logger.info("studentResponse is {}", JSONObject.toJSONString(studentResponse));
}
}
}
测试： 启动两个项目
http://localhost:8080/api/student/search
http://localhost:8080/api/student/save
http://localhost:8080/api/student/saveList
分别执行Demo A 的三个方法， 前提保证待传输的文件存在
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