用Javascript向服务器发送数据_js ip发指令-优快云博客

本文链接：https://blog.youkuaiyun.com/landebug/article/details/7325215

本文介绍了通过JavaScript实现向服务器发送数据的一种方法：点击按钮触发JS函数，动态创建表单并填充数据，然后提交表单。

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第一种方式是，点击链接，触发一个js函数，在该函数内，用dom生成表单和输入框，将值赋在表单里，提交表单。

function postwith(to, p) {
	var myForm = document.createElement("form");
	myForm.method = "post";
	myForm.action = to;
	for ( var k in p) {
		var myInput = document.createElement("input");
		myInput.setAttribute("name", k);
		myInput.setAttribute("value", p[k]);
		myForm.appendChild(myInput);
	}
	document.body.appendChild(myForm);
	myForm.submit();
	document.body.removeChild(myForm);
}

 <body>
    <a href="javascript:postwith('save',{'currentPage':'2','xisuo':'计算机'})">use js to post</a>

save是个servlet

public class save extends HttpServlet {

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		String currentPage = request.getParameter("currentPage");
		String xisuo = request.getParameter("xisuo");
		
		System.out.println(currentPage+"---"+xisuo);
		
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method1111111111");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

第二种是用表单

<body>
    <form name="form1" action="post-data-result.jsp" method="post">
		<input name="post_data" type="text"></input>
		<input type="button" onclick="postData()" value="提交"></input>
	</form>
	<form name="form2" action="post-data-result.jsp" method="post">
		<input name="post_data" type="text"></input>
		<input type="button" onclick="postData()" value="提交"></input>
	</form>
	<form name="form3" action="post-data-result.jsp" method="post">
		<input name="post_data" type="text"></input>
		<input type="button" onclick="postData()" value="提交"></input>
	</form>
  </body>

function postData(){
	var myForm = document.createElement("form");
	myForm.method = "post";
	myForm.action = "post-data-result.jsp";
	var inputs=document.getElementsByName("post_data");
	var i;
	for (i=0;i<inputs.length;i++) {
		var myInput = document.createElement("input");
		myInput.type = "text";
		myInput.name="post_data";
		myInput.value=inputs[i].value;
		myForm.appendChild(myInput);
	}
	document.body.appendChild(myForm);
	myForm.submit();
	document.body.removeChild(myForm);
}

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>获得客户端数据</title>
</head>
<body>
<%
//这里设置的字符集要跟index.html中的charset一致
request.setCharacterEncoding("utf-8");
String[] text=request.getParameterValues("post_data");
for(String t : text){
out.print(t+"<br>");
}
%>
</body>
</html>