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
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>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("<?xml version="1.0" encoding="UTF-8"?>");
resultBuffer.append("<report_data>");
resultBuffer.append("<respon_req>953947334</respon_req>");
resultBuffer.append("<respon_time>20120402113943</respon_time>");
resultBuffer.append("<result>");
resultBuffer.append("<speciality>线路</speciality>");
resultBuffer.append("<personnel>王加和</personnel>");
resultBuffer.append("<begin_time>20120301000000</begin_time>");
resultBuffer.append("<end_time>20120331235959</end_time>");
resultBuffer.append("<plan_quantity>50</plan_quantity>");
resultBuffer.append("<checkout_quantity>40</checkout_quantity>");
resultBuffer.append("<patrol_rate>0.80</patrol_rate>");
resultBuffer.append("</item>");
resultBuffer.append("</items>");
resultBuffer.append("</report_data>");
// 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
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app id="WebApp_1531107906806">
<display-name>Archetype Created Web Application</display-name>
<!--设置的接口就为 IP：port+项目名+下方定义/SetInfo： http://localhost:8080/myServers/SetInfo -->
<servlet>
<servlet-name>third</servlet-name>
<servlet-class>mytest.server.SetInfo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>third</servlet-name>
<url-pattern>/SetInfo</url-pattern>
</servlet-mapping>
</web-app>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("<?xml version="1.0" encoding="UTF-8"?>");
sendStr.append("<report_data>");
sendStr.append("<request_req>953943547334</request_req>");
sendStr.append("<request_time>2012040211394324</request_time>");
sendStr.append("<request_param>");
sendStr.append("<query_month>201203</query_month>");
sendStr.append("</request_param>");
sendStr.append("</report_data>");
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。