webservice學習筆記(十三):HttpUrlConnection請求Web Service
1.大致流程:
a.前端觸發事件
b.ajax傳遞到servlet
c.servlet獲取請求值並寫成請求包的形式傳遞給服務端
d.響應碼為200的時候,讀取資料並且寫到瀏覽器上
e.jquery對報文進行解析,獲取return標籤中的響應值並輸出
2.首先新建一個Servlet,程式碼如下:
package com.wayne.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.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class wayneServlet
* 跨域,使用HttpUrlConnection傳送webservice請求
* 該servlet為客戶端
*/
@WebServlet("/wayneServlet")
public class wayneServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public wayneServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name=request.getParameter("name");
System.out.println("doPost");
//請求報文,拼接name等引數
String data="<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:q0='http://ws.wayne.com/' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><soapenv:Body><q0:sayHello><arg0>"+name+"</arg0></q0:sayHello></soapenv:Body></soapenv:Envelope>";;
//宣告Url物件,引數為服務端的地址
URL url=new URL("http://localhost:8080/day_six_ws_cxf_spring_web_ajax/gotham/gotham");
//原本應該是UrlConnection物件,因為遵循http協議所以要宣告為HttpUrlConnection物件
HttpURLConnection connection=(HttpURLConnection) url.openConnection();
//請求方式
connection.setRequestMethod("POST");
//是否可以輸出資料
connection.setDoOutput(true);
//是否可以接收伺服器端的資料
connection.setDoInput(true);
//設定資料格式
connection.setRequestProperty("Content-Type", "text/xml;charset=utf-8");
//寫資料
OutputStream os = connection.getOutputStream();
os.write(data.getBytes("utf-8"));
//獲取響應碼
int responseCode = connection.getResponseCode();
if(responseCode==200){
//讀資料,xml格式的字串
InputStream is = connection.getInputStream();
//獲取讀到的位元組數
System.out.println("return"+is.available());
//設定響應格式
response.setContentType("text/text;charset=utf-8");
ServletOutputStream outputStream = response.getOutputStream();
byte[] buffer=new byte[1024];
int len=0;
if((len=is.read(buffer))>0){
//寫到瀏覽器
outputStream.write(buffer, 0, len);
}
outputStream.flush();
}
}
}
3.在jsp頁面建立按鈕,並編寫jquery觸發事件,片段程式碼如下:
4.執行結果如下:
