webserive学习记录6-页面请求webservice

2022-10-24 07:47:11

　　前面都是通过JAVA代码访问webservice服务，下面将介绍通过javascript，jquery访问webservice服务并介绍过过servlet解决跨域问题的方法。

　　服务端

　　编写服务代码，解决跨域的servlet，通过spring管理项目。在此不在赘述。

　　servlet代码如下：

package js.ws.servlet;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.omg.CORBA.BAD_TYPECODE;

public class HttpURLConnectionServlet extends HttpServlet{

	private static final long serialVersionUID = -3903837158147517884L;

	@Override

	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		String data = "<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'><soap:Body><ns2:helloJS xmlns:ns2='http://interf.ws.js/'><arg0>leo</arg0></ns2:helloJS></soap:Body></soap:Envelope>";

		URL url = new URL("http://192.168.0.102:8080/jsws/services/helloJS");

		HttpURLConnection conn = (HttpURLConnection) url.openConnection();

		conn.setRequestMethod("POST");

		conn.setDoOutput(true);

		conn.setDoInput(true);

		conn.setRequestProperty("Content-Type", "text/xml;charset=utf-8");

		OutputStream os = conn.getOutputStream();

		os.write(data.getBytes("utf-8"));

		int responseCode = conn.getResponseCode();

		if(responseCode == 200)

		{

			resp.setContentType("text/xml;charset=utf-8");

			InputStream is = conn.getInputStream(); // string xml

			ServletOutputStream outputStream = resp.getOutputStream();

			byte[] buffer = new byte[1024];

			int len = 0;

			while((len = is.read(buffer)) > 0)

			{

				outputStream.write(buffer, 0, len);

			}

			outputStream.flush();

		}

	}

}

　　用于获取浏览器发出的访问webservice服务的请求，并真实访问webservice服务，并返回访问服务的结果。

　　客户端

　　简单起见，测试代码也写在了服务器中。

　　Hello.jsp代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"

	pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<script type="text/javascript" src="jquery-3.2.1.min.js"></script>

<title>hello eclipse</title>

<script type="text/javascript">

	var servletUrl = "/jsws/services/helloServlet";

	var url = "http://localhost:8080/jsws/services/helloJS";

	var data = '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ns2:helloJS xmlns:ns2="http://interf.ws.js/"><arg0>leo</arg0></ns2:helloJS></soap:Body></soap:Envelope>';

	function getXMLHttpRequest() {

		var xmlHttpReq = null;

		if (window.XMLHttpRequest) {// Mozilla Firefox, Opera 8.0+, Safari

			xmlHttpReq = new XMLHttpRequest();

		} else {

			if (window.ActiveXObject) {// Internet Explorer

				try {

					xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");

				} catch (e) {

					try {// Internet Explorer

						xmlHttpReq = new ActiveXObject("Msxml2.XMLHTTP");

					} catch (e) {

					}

				}

			}

		}

		return xmlHttpReq;

	}

	$(function(){

		$.post(servletUrl,

			   null,

			   function(msg){

				  var $return = $(msg);

				  alert("servlet: " + $return.find("return").text());

			   },

			   "xml");

		$.post(url,

			   data,

			   function(msg){

				  var $return = $(msg);

				  alert("ajax: " + $return.find("return").text());

			   },

			   "xml")

	});

	window.onload = javascriptWs;

	function javascriptWs()

	{

		var xmlHttpReq = getXMLHttpRequest();

		xmlHttpReq.open("post", url);

		xmlHttpReq.responseType = "document";

		xmlHttpReq.onreadystatechange = function(){

			if(xmlHttpReq.status == 200 && xmlHttpReq.readyState == 4)

			{

				var dom = xmlHttpReq.response;

				var returnEle = dom.getElementsByTagName("return")[0];

				alert("javascript: " + returnEle.firstChild.data);

			}

		}

		xmlHttpReq.setRequestHeader("Content-Type", "text/xml;charset=utf-8");

		xmlHttpReq.send(data);

	}

</script>

</head>

<body>

</body>

</html>

　上面代码分别采用了javascript，jquery发送ajax请求和servlet方式请求webservice服务。

　　跨域问题来源于JavaScript的同源策略，即只有协议+主机名+端口号 (如存在)相同，则允许相互访问。也就是说JavaScript只能访问和操作自己域下的资源，不能访问和操作其他域下的资源。这里通过servlet方式解决跨域问题。

　　web.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>jsws</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <!-- 加入spring -->

   <context-param>

     <param-name>contextConfigLocation</param-name>

     <param-value>classpath:applicationContext*.xml</param-value>

   </context-param>

   <listener>

    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

   </listener>  

  <!-- 加入CXF支持 -->

   <servlet>

        <description>Apache CXF Endpoint</description>

        <display-name>cxf</display-name>

        <servlet-name>cxf</servlet-name>

        <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>cxf</servlet-name>

        <url-pattern>/services/*</url-pattern>

    </servlet-mapping>

    <servlet>

    	<servlet-name>wsaccrossdomain</servlet-name>

    	<servlet-class>js.ws.servlet.HttpURLConnectionServlet</servlet-class>

    </servlet>

    <servlet-mapping>

    	<servlet-name>wsaccrossdomain</servlet-name>

    	<url-pattern>/services/helloServlet</url-pattern>

    </servlet-mapping>

</web-app>

　　执行结果如下：

　　代码地址：https://files.cnblogs.com/files/liunianfeiyu/jsws.rar

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