本文实例为大家分享了HttpClient实现远程调用的具体代码，供大家参考，具体内容如下
依赖：
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.6</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.58</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpmime</artifactId> <version>4.5.5</version> </dependency>
服务提供者：
/**
* get请求
*/
@GetMapping("/gte3")
public AjaxResult getGuke3(Integer id) throws Exception {
System.err.println("id:" id);
Uesr uesr = new Uesr();
uesr.setId(11);
uesr.setName("chen");
return AjaxResult.success(uesr);
}
/**
*post请求
*/
@PostMapping("/test001")
public AjaxResult post1(@RequestBody Uesr uesr) {
System.err.println(uesr.getId() uesr.getName());
return AjaxResult.success(1);
}
/**
* 文件上传
*/
@PostMapping("/test14")
public AjaxResult test14(MultipartFile multipartFile, String id, String fileMd5) throws IOException {
System.err.println(id);
System.err.println(fileMd5); final InputStream inputStream = multipartFile.getInputStream();
int i = 0;
while ((i = inputStream.read()) != -1) {
char c = (char) i;
System.err.println(c);
}
return AjaxResult.success(1);
}封装的工具类：
package cn.sotos;
import cn.sotos.util.AjaxResult;
import cn.sotos.util.Uesr;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.methods.*;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* @program: exportool
* @description:
* @author: hu.chen
**/
public class HttpClientHelper {
private static CloseableHttpClient httpClient = HttpClientBuilder.create().build();
public static void main(String[] args) throws Exception {
HttpClientHelper httpClientHelper = new HttpClientHelper();
//get请求
Map<String, Object> mapget = new ConcurrentHashMap<>();
mapget.put("id", 1);
AjaxResult<Uesr> resultGet = httpClientHelper.doGet("http://127.0.0.1:8081/gte3", mapget, null, Uesr.class);
System.err.println(resultGet.getCode());
System.err.println(resultGet.getMsg());
final Uesr uesr = resultGet.getData();
System.err.println(uesr.getName());
//post请求
Map<String, Object> mappost = new ConcurrentHashMap<>();
mappost.put("id", 2);
mappost.put("name", "陈虎001post");
Uesr uesr1 = new Uesr();
uesr1.setName("chenpost");
uesr1.setId(001);
AjaxResult<Integer> resultPost = httpClientHelper.doPost("http://127.0.0.1:8081/test001", uesr1, null, Integer.class);
System.err.println(resultPost.getCode());
System.err.println(resultPost.getMsg());
final Integer nteger = resultPost.getData();
System.err.println(nteger);
//文件请求
List<File> files = new ArrayList<>();
File file = new File("D:/t.txt");
files.add(file);
Map<String, String> mapfile = new ConcurrentHashMap<>();
mappost.put("id", " 2");
mappost.put("fileMd5", "陈虎001file");
AjaxResult<Integer> resultFile = httpClientHelper.updataFile("http://127.0.0.1:8081/test14", "multipartFile", files, mapfile, Integer.class);
final Integer ntegerfile = resultFile.getData();
System.err.println(ntegerfile);
}
/**
* 带参数的get请求
*
* @param url 请求地址
* @param parameValues 参数
* @param headerValues 请求头参数
* @param clazz 返回参数类型
* @return
* @throws Exception
*/
public <T> AjaxResult doGet(String url, Map<String, Object> parameValues, Map<String, String> headerValues, Class<T> clazz) throws Exception {
// 声明URIBuilder
URIBuilder uriBuilder = new URIBuilder(url);
// 判断参数map是否为非空
if (parameValues != null) {
// 遍历参数
for (Map.Entry<String, Object> entry : parameValues.entrySet()) {
// 设置参数
uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
}
}
// 2 创建httpGet对象，相当于设置url请求地址
HttpGet httpGet = new HttpGet(uriBuilder.build());
/*
* 添加请求头信息
*/
//判断请求头是否不为空
if (headerValues != null) {
for (Map.Entry<String, String> entry : headerValues.entrySet()) {
httpGet.addHeader(entry.getKey(), entry.getValue());
}
}
// 传输的类型
httpGet.addHeader("Content-Type", "application/x-www-form-urlencoded");
// 3 使用HttpClient执行httpGet，相当于按回车，发起请求
CloseableHttpResponse response = httpClient.execute(httpGet);
// 4 解析结果，封装返回对象httpResult，相当于显示相应的结果
return pasResponse(response, clazz);
}
/**
* 带参数的post请求
*
* @param url 请求地址
* @param parameter 参数
* @param headerValues 请求头参数
* @param clazz 返回参数类型
* @return
* @throws Exception
*/
public <T> AjaxResult doPost(String url, Object parameter, Map<String, String> headerValues, Class<T> clazz) throws Exception {
// 声明httpPost请求
HttpPost httpPost = new HttpPost(url);
setParam(httpPost, parameter, headerValues);
// 传输的类型
httpPost.addHeader("Content-Type", "application/json; charset=UTF-8");
// 使用HttpClient发起请求，返回response
CloseableHttpResponse response = httpClient.execute(httpPost);
// 4 解析结果，封装返回对象httpResult，相当于显示相应的结果
return pasResponse(response, clazz);
}
/**
* 带参数的Put请求
*
* @param url 请求地址
* @param parameter 参数
* @param headerValues 请求头参数
* @param clazz 返回参数类型
* @return
* @throws Exception
*/
public <T> AjaxResult doPut(String url, Object parameter, Map<String, String> headerValues, Class<T> clazz) throws Exception {
// 声明httpPost请求
HttpPut httpPut = new HttpPut(url);
setParam(httpPut, parameter, headerValues);
// 传输的类型
httpPut.addHeader("Content-Type", "application/json; charset=UTF-8");
// 使用HttpClient发起请求，返回response
CloseableHttpResponse response = httpClient.execute(httpPut);
// 4 解析结果，封装返回对象httpResult，相当于显示相应的结果
return pasResponse(response, clazz);
}
/**
* 远程调用传输文件
*
* @param url 请求地址
* @param fileKey 后端接收的文件参数的名称
* @param files 文件集合
* @param parameValues 其他参数
* @param clazz 返回参数类型
*/
public <T> AjaxResult updataFile(String url, String fileKey, List<File> files, Map<String, String> parameValues, Class<T> clazz) throws IOException {
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost(url);
CloseableHttpResponse response = null;
MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
//设置文件参数
for (File file : files) {
multipartEntityBuilder.addBinaryBody(fileKey, file, ContentType.DEFAULT_BINARY, URLEncoder.encode(file.getName(), "utf-8"));
}
//设置其他参数
if (parameValues != null) {
// 其它参数(注:自定义contentType，设置UTF-8是为了防止服务端拿到的参数出现乱码)
ContentType contentType = ContentType.create("application/json", Charset.forName("UTF-8"));
for (Map.Entry<String, String> entry : parameValues.entrySet()) {
multipartEntityBuilder.addTextBody(entry.getKey(), entry.getValue(), contentType);
}
}
HttpEntity httpEntity = multipartEntityBuilder.build();
httpPost.setEntity(httpEntity);
response = httpClient.execute(httpPost);
// 4 解析结果，封装返回对象httpResult，相当于显示相应的结果
return pasResponse(response, clazz);
}
/**
* 设置参数
*
* @param parameter 请求参数
* @param headerValues 请求头参数
*/
private void setParam(HttpEntityEnclosingRequestBase requestBase, Object
parameter, Map<String, String> headerValues) {
// 判断参数是否不为空
if (parameter != null) {
// 在传送复杂嵌套对象时，一定要把对象转成json字符串，我这里实用的是alibaba.fastjson，当然你也可以使用其他的json工具
StringEntity requestEntity = new StringEntity(JSON.toJSONString(parameter), "utf-8");
requestEntity.setContentEncoding("UTF-8");
requestBase.setEntity(requestEntity);
}
//判断请求头是否不为空
if (headerValues != null) {
for (Map.Entry<String, String> entry : headerValues.entrySet()) {
requestBase.addHeader(entry.getKey(), entry.getValue());
}
}
}
/**
* 封装返回结果
*
* @param response 数据集
* @param clazz 参数类型
* @param <T>
* @return
* @throws IOException
*/
private <T> AjaxResult pasResponse(CloseableHttpResponse response, Class<T> clazz) throws IOException {
AjaxResult<T> ajaxResult = null;
try {
// 解析数据封装HttpResult
if (response.getEntity() != null) {
ajaxResult = JSONObject.parseObject(EntityUtils.toString(response.getEntity(), "utf-8"), AjaxResult.class);
ajaxResult.setData(JSONObject.parseObject(JSONObject.toJSONString(ajaxResult.getData()), clazz));
} else {
ajaxResult = new AjaxResult();
}
} catch (ParseException | IOException e) {
System.err.println("返回结果转换失败" e);
} finally {
try {
// 释放资源
if (response != null) {
response.close();
}
} catch (IOException e) {
System.err.println("资源释放失败" e);
}
}
return ajaxResult;
}
}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持Devmax。