java http的get、post、post json参数的方法
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"; } }
