对于http的post json参数方法使用的是Apache的HttpClient-4.x.Jar，先引入jar
在maven添加如下：
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.12</version>
</dependency>使用Apache的HttpClient-4.x.Jar包。
Jar包Maven下载地址：https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient。
1、先创建HttpUtil 工具类：
package com.game.www.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import com.alibaba.fastjson.JSONObject;
public class HttpUtil {
public static String doGet(String httpurl) {
HttpURLConnection connection = null;
InputStream is = null;
BufferedReader br = null;
String result = null;// 返回结果字符串
try {
// 创建远程url连接对象
URL url = new URL(httpurl);
// 通过远程url连接对象打开一个连接，强转成httpURLConnection类
connection = (HttpURLConnection) url.openConnection();
// 设置连接方式：get
connection.setRequestMethod("GET");
// 设置连接主机服务器的超时时间：15000毫秒
connection.setConnectTimeout(15000);
// 设置读取远程返回的数据时间：60000毫秒
connection.setReadTimeout(60000);
// 发送请求
connection.connect();
// 通过connection连接，获取输入流
if (connection.getResponseCode() == 200) {
is = connection.getInputStream();
// 封装输入流is，并指定字符集
br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
// 存放数据
StringBuffer sbf = new StringBuffer();
String temp = null;
while ((temp = br.readLine()) != null) {
sbf.append(temp);
sbf.append("\r\n");
}
result = sbf.toString();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 关闭资源
if (null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != is) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
connection.disconnect();// 关闭远程连接
}
return result;
}
public static String doPost(String httpUrl, String param) {
HttpURLConnection connection = null;
InputStream is = null;
OutputStream os = null;
BufferedReader br = null;
String result = null;
try {
URL url = new URL(httpUrl);
// 通过远程url连接对象打开连接
connection = (HttpURLConnection) url.openConnection();
// 设置连接请求方式
connection.setRequestMethod("POST");
// 设置连接主机服务器超时时间：15000毫秒
connection.setConnectTimeout(150000);
// 设置读取主机服务器返回数据超时时间：60000毫秒
connection.setReadTimeout(600000);
// 默认值为：false，当向远程服务器传送数据/写数据时，需要设置为true
connection.setDoOutput(true);
// 默认值为：true，当前向远程服务读取数据时，设置为true，该参数可有可无
connection.setDoInput(true);
// 设置传入参数的格式:请求参数应该是 name1=value1&name2=value2 的形式。
connection.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
// 设置鉴权信息：Authorization: Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0
connection.setRequestProperty("Authorization",
"Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0");
// 通过连接对象获取一个输出流
os = connection.getOutputStream();
// 通过输出流对象将参数写出去/传输出去,它是通过字节数组写出的
os.write(param.getBytes());
// 通过连接对象获取一个输入流，向远程读取
if (connection.getResponseCode() == 200) {
is = connection.getInputStream();
// 对输入流对象进行包装:charset根据工作项目组的要求来设置
br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuffer sbf = new StringBuffer();
String temp = null;
// 循环遍历一行一行读取数据
while ((temp = br.readLine()) != null) {
sbf.append(temp);
sbf.append("\r\n");
}
result = sbf.toString();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 关闭资源
if (null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != os) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != is) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// 断开与远程地址url的连接
connection.disconnect();
}
return result;
}
/**
* 发送post请求
* @param URL
* @param json
*
* @return
*/
public static String sendPost(String URL,JSONObject json) {
CloseableHttpClient client = HttpClients.createDefault();
HttpPost post = new HttpPost(URL);
post.setHeader("Content-Type", "application/json");
post.addHeader("Authorization", "Basic YWRtaW46");
String result;
try {
StringEntity s = new StringEntity(json.toString(), "utf-8");
s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
"application/json"));
post.setEntity(s);
// 发送请求
HttpResponse httpResponse = client.execute(post);
// 获取响应输入流
InputStream inStream = httpResponse.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
inStream, "utf-8"));
StringBuilder strber = new StringBuilder();
String line;
while ((line = reader.readLine()) != null)
strber.append(line + "\n");
inStream.close();
result = strber.toString();
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
System.out.println("请求服务器成功，做相应处理");
} else {
System.out.println("请求服务端失败");
}
} catch (Exception e) {
// logger.error("请求异常："+e.getMessage());
throw new RuntimeException(e);
}
return result;
}
}2、spring mvc 的controller 测试案例：
@RequestMapping(value = "/get", method = RequestMethod.GET, produces = "text/html;charset=UTF-8")
@ResponseBody
@ApiOperation(value = "get", notes = "get")
@ApiResponse(response= String.class, code = 200, message = "接口返回对象参数")
public String get(HttpServletRequest request, HttpServletResponse response) {
try {
String url = "http://11.29.11.19:8080/Inv/baseData/action/getList";
String result = HttpUtil.doGet(url);
return result;
} catch (Exception e) {
e.printStackTrace();
return "fail";
}
}
@RequestMapping(value = "/post", method = RequestMethod.GET, produces = "text/html;charset=UTF-8")
@ResponseBody
@ApiOperation(value = "post", notes = "post")
@ApiResponse(response= String.class, code = 200, message = "接口返回对象参数")
public String post(HttpServletRequest request, HttpServletResponse response) {
try {
String url = "http://11.29.11.19:8080/Inv/baseData/action/query";
String p = "limit=10&offset=2";
String result = HttpUtil.doPost(url, p);
return result;
} catch (Exception e) {
e.printStackTrace();
return "fail";
}
}
@RequestMapping(value = "/postJson", method = RequestMethod.GET, produces = "text/html;charset=UTF-8")
@ResponseBody
@ApiOperation(value = "postJson", notes = "postJson")
@ApiResponse(response= String.class, code = 200, message = "接口返回对象参数")
public String postJson(HttpServletRequest request, HttpServletResponse response) {
try {
String url = "http://11.29.11.19:8080/my/api/user/login";
JSONObject jsonObject = new JSONObject();
jsonObject.put("loginname", "123456");
jsonObject.put("pwd", "123456");
String result = HttpUtil.sendPost(url,jsonObject);
return result;
} catch (Exception e) {
e.printStackTrace();
return "fail";
}
}