步骤四： 修改ActionServlet
package web;
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;
public class ActionServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
//获取请求资源路径
String uri = request.getRequestURI();
String path = uri.substring(
uri.lastIndexOf("/"),
uri.lastIndexOf("."));
if(path.equals("/get_text")){//get请求
out.println("get请求-服务器返回的数据");
}else if(path.equals("/post_text")){//post请求
String name = request.getParameter("uname");
System.out.println(name);
out.println("又来了一次的" + name);
}
out.close();
}
}
步骤五： 运行，查看结果
3.4 完整代码
ajax03.html文件代码如下：
<html>
<head>
<title>ajax03.html</title>
<meta http-equiv="Content-Type"
content="type=text/html;charset=UTF-8">
<script type="text/javascript" src="js/my.js"></script>
<script type="text/javascript">
function getText(){
var xhr = getXhr();
xhr.onreadystatechange=function(){
if(xhr.readyState==4 && xhr.status==200){
alert(xhr.responseText);
}
};
xhr.open("post","post_text.do",true);
xhr.setRequestHeader('content-type',
'application/x-www-form-urlencoded');
xhr.send("uname=daliu_it");
}
</script>
</head>
<body>
<!-- 使用Ajax对象发送POST类型请求，并获取文本 -->
<input type="button" onclick="getText()" value="POST请求"/>
</body>
</html>
ActionServlet.java文件代码如下：
package web;
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;
public class ActionServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
// 获取请求资源路径
String uri = request.getRequestURI();
String path = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
if (path.equals("/get_text")) {// get请求
out.println("get请求-服务器返回的数据");
} else if (path.equals("/post_text")) {// post请求
String name = request.getParameter("uname");
System.out.println(name);
out.println("又来了一次的" + name);
}
out.close();
}
}
