servlet--http接口简单的创建及调用

很久没有用servlet的交互技术，生疏的遭不住。现在简单的说说servlet中http接口的创建及调用，便于大家理解，使用。

先说说服务端，就是提供服务方的代码：

pom.xml

junit

junit

3.8.1

test

javax.servlet

javax.servlet-api

3.1.0

provided

首先是提供一个接口的代码如下：

import java.io.BufferedReader;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* @author cwc

* @date 2018年7月9日

* @version 1.0.0

* @description:创建一个Http接口

*/

public class SetInfo extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

//判断请求报文是否来自代维系统的ip地址

String ip = request.getRemoteHost();

// 获取收到的报文

BufferedReader reader = request.getReader();

String line = "";

StringBuffer inputString = new StringBuffer();

while ((line = reader.readLine()) != null) {

inputString.append(line);

System.out.println("接受到的数据"+line);

}

//如有必要，可以在报文中增加其他验证和加密的参数

//解析获取到的报文，根据ip地址、其他验证、加密等等来判断请求报文的服务器是否有权限

//如果请求验证合格，则根据请求的参数装配返回的报文

// 要返回的报文,append后面就添加你想要返回的报文，返回的数据可以结合你后面处理逻辑的业务层

StringBuffer resultBuffer = new StringBuffer();

resultBuffer.append("");

resultBuffer.append("");

resultBuffer.append("953947334");

resultBuffer.append("20120402113943");

resultBuffer.append("");

resultBuffer.append("线路");

resultBuffer.append("王加和");

resultBuffer.append("20120301000000");

resultBuffer.append("20120331235959");

resultBuffer.append("50");

resultBuffer.append("40");

resultBuffer.append("0.80");

resultBuffer.append("");

resultBuffer.append("");

resultBuffer.append("");

// 设置发送报文的格式

response.setContentType("text/xml");

response.setCharacterEncoding("UTF-8");

PrintWriter out = response.getWriter();

out.println(resultBuffer.toString());

out.flush();

out.close();

}

protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

//将get方法放入post中，为安全性

doGet(request,response);

}

}配置web.xml

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd" >

Archetype Created Web Application

third

mytest.server.SetInfo

third

/SetInfo

之后就是服务的调用，先说说使用java自带的HttpURLConnection，这里不需要导入什么jar包，直接写个类调用就好。

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.URL;

/**

* @author cwc

* @date 2018年7月7日

* @version 1.0.0

* @description: 调用http接口

*/

public class GetConsumer {

public static void main(String[]args) throws Exception{

System.out.println("开始发送接收——————————————————————————");

// tOne();

String url ="http://localhost:8080/myServers/SetInfo";

getURLContent(url);

}

public static void tOne() throws Exception{

System.out.println("调用servlet开始=================");

StringBuffer sendStr = new StringBuffer();

sendStr.append("");

sendStr.append("");

sendStr.append("953943547334");

sendStr.append("2012040211394324");

sendStr.append("");

sendStr.append("201203");

sendStr.append("");

sendStr.append("");

BufferedReader reader = null;

try {

String strMessage = "";

StringBuffer buffer = new StringBuffer();

// 接报文的地址

URL uploadServlet = new URL(

"http://localhost:8080/myServers/SetInfo");

HttpURLConnection servletConnection = (HttpURLConnection) uploadServlet

.openConnection();

// 设置连接参数

servletConnection.setRequestMethod("POST");

servletConnection.setDoOutput(true);

servletConnection.setDoInput(true);

servletConnection.setAllowUserInteraction(true);

// 开启流，写入XML数据

OutputStream output = servletConnection.getOutputStream();

System.out.println("发送的报文：");

System.out.println(sendStr.toString());

output.write(sendStr.toString().getBytes());

output.flush();

output.close();

// 获取返回的数据

InputStream inputStream = servletConnection.getInputStream();

reader = new BufferedReader(new InputStreamReader(inputStream));

while ((strMessage = reader.readLine()) != null) {

buffer.append(strMessage);

}

System.out.println("接收返回值:" + buffer);

} catch (java.net.ConnectException e) {

throw new Exception();

} finally {

if (reader != null) {

reader.close();

}

}

}

/**

* 程序中访问http数据接口

*/

public static String getURLContent(String urlStr) {

/** 网络的url地址 */

URL url = null;

/** http连接 */

HttpURLConnection httpConn = null;

/**//** 输入流 */

BufferedReader in = null;

StringBuffer sb = new StringBuffer();

try {

url = new URL(urlStr);

in = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));

String str = null;

while ((str = in.readLine()) != null) {

sb.append(str);

}

} catch (Exception ex) {

} finally {

try {

if (in != null) {

in.close();

}

} catch (IOException ex) {

}

}

String result = sb.toString();

System.out.println(result);

return result;

}

}补充：使用httpClient的方式调用

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.URI;

import java.net.URISyntaxException;

import org.apache.http.HttpEntity;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.utils.URIBuilder;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

/**

* @author cwc

* @date 2018年7月10日

* @version 1.0.0

* @description:通过httpClient调用接口

*/

public class MyHttpClient {

public static void main(String[]args){

getHttpData();

}

public static void getHttpData(){

//1.使用默认的配置的httpclient

CloseableHttpClient client = HttpClients.createDefault();

HttpGet httpGet = null;

InputStream inputStream = null;

CloseableHttpResponse response = null;

try {

//2.使用get方法,传递参数

URI url =new URIBuilder()

.setScheme("http")

.setHost("192.168.100.6:8080")//ip:port

.setPath("/detail/index.htm")//接口

.setParameter("mkdirName", "/MyTestTwoooooo")//key，value

.setParameter("fileName", "/MyTestTwo/One")

.build();

System.out.println(url);

httpGet = new HttpGet(url);

//3.执行请求，获取响应

response = client.execute(httpGet);

//看请求是否成功，这儿打印的是http状态码

System.out.println(response.getStatusLine().getStatusCode());

//4.获取响应的实体内容，就是我们所要抓取得网页内容

HttpEntity entity = response.getEntity();

//5.将其打印到控制台上面

if (entity != null) {

inputStream = entity.getContent();

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

String line = "";

while ((line = bufferedReader.readLine()) != null) {

System.out.println(line);

}

}

} catch (ClientProtocolException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (URISyntaxException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

方法比较简单，代码可以直接复制使用。

继续加油，最近有些懒了。