「ajax代理java」ajax代理转发
今天给各位分享ajax代理java的知识，其中也会对ajax代理转发进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
JAVA的ajax方法？
//方式一:使用post请求的方式,不通过url传参,采用data传参
$.ajax({
url:"userAction_findMangerByDeptId",//访问的地址
type:"post",
data:{"传递到后台的参数名":参数},
dataType:'text',//后台返回的数据格式类型
success:function(data){
})
}
})
}
//方式二:这是get提交方法,会出现中文乱码,所以要 1.先将数据转码
参数名 = encodeURI(encodeURI(要转的参数));
$.ajax({
url:"userAction_findMangerByDeptId?参数名"+参数值,
type:"get",
dataType:'text',//后台返回的数据格式类型
success:function(data){
})
}
})
}
2.后台接收前端传递内容后要进行解码
String 参数名 = URLDecoder.decode(接收的参数);
如何用JAVA爬取AJAX加载后的页面
普通的爬取是抓不了js的之后的数据的 可以用phantomjs或者htmlUnit实现
附上phantomjs示列代码
package cn.wang.utils;
import java.util.Random;
import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.CookieManager;
import com.gargoylesoftware.htmlunit.NicelyResynchronizingAjaxController;
import com.gargoylesoftware.htmlunit.WebClient;
public class htmlUnitUtils {
static WebClient webClient = null;
static Random random = new Random();
static{
//1.创建对象
webClient = new WebClient(BrowserVersion.CHROME);
//2.设置参数
//启动js
webClient.getOptions().setJavaScriptEnabled(true);
//关闭css渲染
webClient.getOptions().setCssEnabled(false);
//启动重定向
webClient.getOptions().setRedirectEnabled(true);
//设置连接超时时间 ，这里是10S。如果为0，则无限期等待
webClient.getOptions().setTimeout(1000 * 15);
//启动cookie管理
webClient.setCookieManager(new CookieManager());
//启动ajax代理
webClient.setAjaxController(new NicelyResynchronizingAjaxController());
//js运行时错误，是否抛出异常
webClient.getOptions().setThrowExceptionOnScriptError(false);
//设置浏览器请求信息
webClient.addRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
webClient.addRequestHeader("Accept-Encoding", "gzip, deflate");
webClient.addRequestHeader("Accept-Language", "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2");
webClient.addRequestHeader("Connection", "keep-alive");
webClient.addRequestHeader("Upgrade-Insecure-Requests", "1");
}
public static void runJs(String url){
try {
webClient.addRequestHeader("User-Agent", Constant.useragents[random.nextInt(Constant.useragents.length)]);
//等待js渲染执行 waitime等待时间(ms)
webClient.waitForBackgroundJavaScript(1000 * 10);
//3.获取页面
webClient.getPage(url);
} catch (Exception e) {
e.printStackTrace();
} finally {
if(webClient != null){
webClient.close();
}
}
}
public static void main(String[] args) {
runJs("");
System.setProperty("phantomjs.binary.path", "D:\\works\\tool\\phantomjs-2.1.1-windows\\bin\\phantomjs.exe");
}
}
如何使用ajax调用java类
ajax调用java后台的方法，其实是通过url链接来访问，示例如下：package com.xxxx.xxxx.servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
public class oaLoginLimitedServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static Connection conn=null;
private static PreparedStatement pstmt=null;
public oaLoginLimitedServlet() {
super();
}
public void destroy() {
super.destroy();
}
public static String getCount(String userid)
{
String v_sql=".....";
String v_count="";
try {
pstmt = conn.prepareStatement(v_sql);
pstmt.setString(1, userid);
ResultSet rs = pstmt.executeQuery();
while(rs.next()){
v_count = rs.getString(1);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
pstmt.close();
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return v_count;
}
public static Connection getConnection(){
Context ctx = null;
try {
ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("jndiname");
conn = ds.getConnection();
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String v_userid=request.getParameter("userid");
System.out.println(v_userid);
getConnection();
String v_count=getCount(v_userid);
response.setCharacterEncoding("UTF-8");
response.getWriter().write(v_count);
response.flushBuffer();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
}
如果要前端能够访问到该servlet，需要将该servlet注册到 web.xml文件中。需要在web.xml文件中添加以下内容
[html] view plaincopy
servlet
servlet-nameoaLoginLimitedServlet/servlet-name
servlet-classcom.xxxx.xxxx.servlet.oaLoginLimitedServlet/servlet-class
/servlet
servlet-mapping
servlet-nameoaLoginLimitedServlet/servlet-name
url-pattern/oaLoginLimitedServlet/url-pattern
/servlet-mapping
重启相关服务。
通过ajax就可以调用了。
[html] view plaincopy
var msg = $.ajax({
type: "post",
url: ....+'/oaLoginLimitedServlet?userid='+ $('#act').val(),
async:false
}).responseText;
ajax代理java的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于ajax代理转发、ajax代理java的信息别忘了在本站进行查找喔。