Java restFul风格调用get、post请求（包含文件上传与下载）
httpUtil使用说明
0,引用包
package com.activeclub.utils;
import com.activeclub.bean.dto.RequestDto;
import com.activeclub.bean.entity.KeyValue;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.ssl.TrustStrategy;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import javax.net.ssl.SSLContext;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URI;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.List;
1，get请求调用
/**
* get请求
*
* @param requestDto 输入参数
* @param servletResponse 反馈响应（用于文件下载）
* @return 文本输出
*/
public static String doGet(RequestDto requestDto, HttpServletResponse servletResponse) {
String url = requestDto.getUrl();//请求的url路径
String jsonStr = requestDto.getJsonStr();//请求的json输入
List<KeyValue> params = requestDto.getParams();//请求的参数输入
List<KeyValue> headers = requestDto.getHeaders();//header参数
Boolean hasServletResponse = requestDto.getHasServletResponse();//反馈响应
// 中间变量
String resultString = "";
CloseableHttpClient httpclient = null;
CloseableHttpResponse response = null;
InputStream is = null;
OutputStream os = null;
try {
// 1 判断url的类型
if (url.startsWith("https")) {
httpclient = getIgnoeSSLClient();
} else {
httpclient = HttpClients.createDefault();
}
// 2 创建uri
URIBuilder builder = new URIBuilder(url);
if (params != null) {
for (KeyValue kv : params) {
builder.addParameter(kv.getKey(), kv.getValue().toString());
}
}
URI uri = builder.build();
// 3 创建http GET请求 并且 设置token
HttpGet httpGet = new HttpGet(uri);
if (headers != null) {
for (KeyValue kv : headers) {
httpGet.setHeader(kv.getKey(), kv.getValue().toString());
}
}
// 4 执行请求
response = httpclient.execute(httpGet);
// 5 直接进行转换
if (hasServletResponse) {// 5.1 有文件下载
for (Header header : response.getAllHeaders()) {
servletResponse.addHeader(header.getName(), header.getValue());
}
byte[] respStr = EntityUtils.toByteArray(response.getEntity());
is = new ByteArrayInputStream(respStr);
os = servletResponse.getOutputStream();
byte[] buffer = new byte[1024 * 1024];
int count = 0;
while ((count = is.read(buffer)) != -1) {
os.write(buffer, 0, count);
}
os.flush();
} else {// 5.2 没有有文件下载
resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
}
if (url.startsWith("https")) {
EntityUtils.consume(response.getEntity());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭服务
if (response != null) {
try {
response.close();
} catch (IOException e) {
logger.error("CloseableHttpResponse close happend a error! ", e);
}
}
if (httpclient != null) {
try {
httpclient.close();
} catch (IOException e) {
logger.error("httpclient close happend a error! ", e);
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
logger.error("InputStream close happend a error! ", e);
}
}
if (os != null) {
try {
os.close();
} catch (IOException e) {
logger.error("OutputStream close happend a error! ", e);
}
}
}
return resultString;
}
2，post请求调用
/**
* post请求
*
* @param requestDto 输入参数
* @param multipartFile 上传文件
* @param servletResponse 反馈响应（用于文件下载）
* @return 文本输出
*/
public static String doPost(RequestDto requestDto, MultipartFile multipartFile, HttpServletResponse servletResponse) {
String url = requestDto.getUrl();//请求的url路径
String jsonStr = requestDto.getJsonStr();//请求的json输入
List<KeyValue> params = requestDto.getParams();//请求的参数输入
List<KeyValue> headers = requestDto.getHeaders();//header参数
Boolean hasServletResponse = requestDto.getHasServletResponse();//反馈响应
// 中间变量
File localFile = null;
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
InputStream is = null;
OutputStream os = null;
String resultString = "";
try {
// 1 创建Httpclient对象
if (url.startsWith("https")) {
httpClient = getIgnoeSSLClient();
} else {
httpClient = HttpClients.createDefault();
}
// 2 创建uri
URIBuilder builder = new URIBuilder(url);
if (params != null) {
for (KeyValue kv : params) {
builder.addParameter(kv.getKey(), kv.getValue().toString());
}
}
URI uri = builder.build();
// 3 创建Http Post请求
HttpPost httpPost = new HttpPost(uri);
if (headers != null) {
for (KeyValue kv : headers) {
httpPost.addHeader(kv.getKey(), kv.getValue().toString());
}
}
if (!StringUtils.isEmpty(jsonStr)) {// 设置jsonBody
StringEntity entity = new StringEntity(jsonStr, ContentType.APPLICATION_JSON);
httpPost.setEntity(entity);
}
// 4 创建请求内容[如果有文件上传]
if (null != multipartFile) {
localFile = multipartFileToFile(multipartFile);// 把文件转换成流对象FileBody
FileBody fileBody = new FileBody(localFile);
// 以浏览器兼容模式运行，防止文件名乱码。
MultipartEntityBuilder builder2 = MultipartEntityBuilder.create();
builder2.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
builder2.addPart("file", fileBody);
HttpEntity entity = builder2.build();
httpPost.setEntity(entity);
}
// 5 执行http请求
response = httpClient.execute(httpPost);
if (hasServletResponse) {// 5.1 有文件下载
for (Header header : response.getAllHeaders()) {
servletResponse.addHeader(header.getName(), header.getValue());
}
byte[] respStr = EntityUtils.toByteArray(response.getEntity());
is = new ByteArrayInputStream(respStr);
os = servletResponse.getOutputStream();
byte[] buffer = new byte[1024 * 1024];
int count = 0;
while ((count = is.read(buffer)) != -1) {
os.write(buffer, 0, count);
}
os.flush();
} else {
resultString = EntityUtils.toString(response.getEntity(), "utf-8");
}
// https结束
if (url.startsWith("https")) {
EntityUtils.consume(response.getEntity());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭服务
if (response != null) {
try {
response.close();
} catch (IOException e) {
logger.error("response close happend a error! ", e);
}
}
if (httpClient != null) {
try {
httpClient.close();
} catch (IOException e) {
logger.error("httpClient close happend a error! ", e);
}
}
if (localFile != null) {
try {
localFile.delete();
} catch (Exception e) {
logger.error("localFile close happend a error! ", e);
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
logger.error("inputStream close happend a error! ", e);
}
}
if (os != null) {
try {
os.close();
} catch (IOException e) {
logger.error("outputStream close happend a error! ", e);
}
}
}
return resultString;
}
3，辅助函数
// https 操作
private static CloseableHttpClient getIgnoeSSLClient() throws Exception {
SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(null, new TrustStrategy() {
@Override
public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
return true;
}
}).build();
CloseableHttpClient client = HttpClients.custom().setSSLContext(sslContext).
setSSLHostnameVerifier(new NoopHostnameVerifier()).build();
return client;
}
// MultipartFile 转换成为File (需要手动删除delete)
private static File multipartFileToFile(MultipartFile multiFile) {
// 获取文件名
String fileName = multiFile.getOriginalFilename();
try {
String path = System.getProperty("user.dir");
fileName = URLDecoder.decode(fileName, "utf-8");
fileName = URLEncoder.encode(fileName, "utf-8");
File file = new File(path + "\\" + fileName);
file.createNewFile();
multiFile.transferTo(file);
return file;
} catch (Exception e) {
logger.error("file transfer error:", e);
}
return null;
}
4，测试main函数
public static void main(String[] args) {
/**
*1，无入参的get请求(成功)
*/
RequestDto requestDto = new RequestDto();
requestDto.setUrl("https://a1.cnblogs.com/group/B1");
String result1 = doGet(requestDto, null);
System.out.println(result1);
System.out.println("--------------------------");
/**
*2，有入参的get请求（成功）
*/
RequestDto requestDto2 = new RequestDto();
requestDto2.setUrl("https://www.cnblogs.com/ajax/wechatshare/getconfig");
requestDto2.addParam("url","https%3A%2F%2Fwww.cnblogs.com%2F&file");
String result2 = doGet(requestDto2, null);
System.out.println(result2);
System.out.println("--------------------------");
/**
*3，无入参的post请求
*/
RequestDto requestDto3 = new RequestDto();
requestDto3.setUrl("https://www.cnblogs.com/aggsite/editorpickstat");
String result3 = doPost(requestDto3, null,null);
System.out.println(result3);
System.out.println("--------------------------");
/**
*4，有json参数的post请求
*/
RequestDto requestDto4 = new RequestDto();
requestDto4.setUrl("https://recomm.cnblogs.com/api/v2/recomm/blogpost/reco");
requestDto4.setJsonStr("{\"itemId\":11420047,\"itemTitle\":\"\\n 知识点复习统计\\n \\n\\n\\n\"}");
String result4 = doPost(requestDto4, null,null);
System.out.println(result4);
System.out.println("--------------------------");
}
5,其他
可直接访问github https://github.com/mufasa007/repository
其中的app-framework-utils里面的HttpUtil函数
探究未知是最大乐趣
